海洋生物贻贝启发的干/湿态强黏附、自修复高分子胶粘剂

杨皓瑜^1,2，张 庆¹，黄继军¹

（1.中国科学院大学材料科学与光电技术学院，北京 100049；2.Department of Chemical and Materials Engineering, University of Alberta, Alberta, Canada）

【摘  要】受到贻贝黏附蛋白超强黏附性能的启发，研究人员将贻贝黏附蛋白中主要的功能基团多巴胺（主要为儿茶酚基团）引入到高分子材料中，合成了许多具有不同分子结构及功能的贻贝仿生高分子材料，极大地拓宽了其应用范围。本文首先描述了贻贝足丝蛋白的组成和功能，随后介绍了当前贻贝仿生在水下黏合剂、自修复材料、抗污材料以及生物医药材料中的应用，最后对贻贝仿生材料的应用前景进行了展望。

【关键词】贻贝仿生；黏附蛋白；多巴胺；儿茶酚；功能高分子

加成型有机硅光学胶的研究现状

王东哲，庄  锐，陈殿龙，张晶晶，黄  睿，李蕊，王远榕，苏亚平

（黄河三角洲京博化工研究院有限公司，山东滨州  256600）

【摘  要】硅氢加成反应是合成有机硅化合物的重要方法，其在光学胶领域的典型应用即为加成型有机硅光学胶。该类材料因性能优异，被广泛应用于电子电气与光学等领域。本文以高折射率加成型有机硅光学胶为研究对象，系统综述了其关键组分（乙烯基聚硅氧烷、含氢交联剂、催化剂和补强填料）的研究进展，并深入分析了Si—H与Si—V物质的量比及固化程序等关键因素对产品性能的影响。在此基础上，进一步展望了该材料的未来发展方向。

【关键词】硅氢加成；有机硅；光学胶；高折射率

基于光产碱催化的低温固化巯基-环氧/环硫胶粘剂研究

杨雨彤¹，李治全^1,2，刘晓暄^1,2

（1.广东省功能软凝聚态物质重点实验室，广东广州  510006；

2.广东工业大学材料与能源学院，广东广州 510006）

【摘 要】本研究开发了一种基于光产碱催化的巯基-环氧/环硫固化体系，以解决传统光产碱催化胶粘体系储存稳定性差、后固化温度高等问题。通过硫氰酸钾（KSCN）与双酚A缩水甘油醚（BADGE）的亲核取代反应，合成了高活性环硫单体（BADGE-S），并与BADGE、四(3-巯基丁酸)季戊四醇酯（PE-1）交联剂复配，引入光产碱剂(PB-DBU)、光敏剂2-异丙基硫杂蒽酮（ITX），构建了365 nm LED触发的新型巯基-环氧/环硫光固化体系。制备出兼具高储存稳定性、低温快速固化及优异粘接强度的光固化胶粘剂，并对其各项性能进行表征。研究结果表明：⑴通过FT-IR、NMR等多重表征证实，环氧基团完全转化为环硫结构。与环氧前体相比，BADGE-S因环硫基团开环能垒更低且硫原子孤对电子易极化，表现出更高的碱催化反应活性，为后续低温快速固化提供了理想单体。⑵通过光吸收性能研究表明，PB-DBU仅受深紫外光源吸收，引入ITX后体系在350~400 nm获宽强吸收，383 nm消光系数为6.86×10³ L/(mol cm)，三重态（³ITX*）寿命延长，敏化效率提升。365 nm LED辐照下，³ITX*向PB-DBU发生单电子转移，C—N键断裂，3.5 min内pH自7.8升至9.5并稳定，苯酚红变色同步证实DBU快速释放，为后续低温巯基-环氧/环硫点击聚合提供强碱催化。⑶通过聚合动力学研究发现，随着环硫单体含量增至20%，体系聚合峰温从173 ℃降至165 ℃，光照后环氧转化率从13.81%提高至53.33%，在80 ℃低温条件下粘接强度显著提升近10倍（从0.164 MPa至1.532 MPa）。⑷通过贮存稳定性研究证实，PB-DBU光产碱体系表现出优异的储存稳定性，在40 ℃避光条件下贮存144 h仍稳定保持低黏度，明显优于商品化PL-DBN体系。⑸本研究构建的基于光产碱催化的巯基-环氧/环硫固化体系兼具高储存稳定性、低温固化特性和优异粘接性能的光固化胶粘剂体系，为精密电子封装和光学器件组装提供了新的材料选择。

【关键词】光产碱；环硫；巯基-环氧；低温固化；胶粘剂

新型高性能环氧/BAPP-BMI胶粘剂的制备及其固化动力学研究

闻满瑛，范天华，虞鑫海

(东华大学化学与化工学院，上海  201620)

【摘 要】以2,2-双[4-(4-氨基苯氧基)苯基]丙烷（BAPP）和顺丁烯二酸酐（MA）为原料，合成长链含醚键的2,2-双[4-(4-马来酰亚胺基苯氧基)苯基]丙烷（BAPP-BMI）。将双酚A型环氧树脂（E-51）、自制BAPP-BMI、环氧扩链剂（SD-248）、固化剂（MTHPA）及固化促进剂（2E4MI）配制成一系列环氧/BAPP-BMI胶粘剂，并对其结构和性能进行分析。研究结果表明：成功合成了BAPP-BMI单体，并通过FT-IR确认其结构，后将其用于制备环氧/BAPP-BMI胶粘剂。适量添加BAPP-BMI可显著提升固化物的综合性能。其在30 ℃下即表现出高反应活性，最高拉伸剪切强度达15.4 MPa，并有效提高材料的韧性（最高冲击强度提升67%）、力学强度及疏水性（吸水率<0.10%，最低可达0.02%）。固化动力学分析显示，反应活化能为77.52 kJ/mol，反应级数为0.9。同时，该系列胶粘剂在高频下具备稳定的低介电常数（3.84~4.26）与低介电损耗（2.02%~2.20%），电容值在4.97~5.52 pF，显示出优异的介电性能，在电子封装等领域具有应用潜力。

【关键词】BAPP-BMI；胶粘剂；力学性能；介电性能；固化动力学

三聚氰胺-甲醛树脂胶粘剂增韧阻燃改性研究

冯  炎¹，Mashanlo Abdurakhman¹，林芷芊¹，沈佳豪¹，陈风青^1,2，戴进峰^1,2

（1.浙江农林大学化学与材料工程学院，浙江杭州 311300；2.浙江省木材科学与技术重点实验室，浙江杭州 311300）

【摘 要】三聚氰胺-甲醛树脂（MF）胶粘剂尽管具有较好耐热性，但其脆性大限制了在浸渍纸饰面材料中应用。本研究通过硼酸与羟基硅油缩聚合成聚硼硅氧烷（PBS），并以此对MF进行增韧阻燃改性，系统探究了PBS添加量对改性MF胶粘剂力学性能、阻燃性能及韧性的影响。研究结果表明：PBS中Si—O—B柔性链段通过物理缠结与氢键作用显著提升MF的韧性，且改性MF胶粘剂的胶合强度与阻燃性能均得到增强。当PBS添加量为5%时，改性MF试样的极限氧指数（LOI）达34.3%，较纯MF提高4.6%；浸渍纸单板的烧穿时间延长至106 s（提升253%）；干/湿粘接强度分别达2.98和3.11 MPa，较纯MF提升36.1%和5.8%。同时，5%PBS改性MF的断裂伸长率由4.2%提升至26.5%，表现出优异的柔韧性与抗裂性能。本研究为开发兼具高强度、高韧性及阻燃性能的MF胶粘剂提供了新策略，对拓展MF胶粘剂在定制化装饰材料中的应用具有重要价值。

【关键词】三聚氰胺-甲醛树脂；聚硼硅氧烷；增韧改性；阻燃性能

室温硫化硅橡胶的黄变影响因素

刘  彬，秦  鹰，曹俊茹，赵志鹏，谢志坚，王韵然

(1.中蓝晨光化工研究设计院有限公司，四川成都 610041；2.国家有机硅工程技术研究中心，四川成都  610041)

【摘  要】以端羟基聚二甲基硅氧烷为基础聚合物、气相法白炭黑为补强填料、酮肟基硅烷为交联剂、二月桂酸二丁基锡为催化剂，制备了单组分室温硫化硅橡胶。考察了酮肟基交联剂、硅烷偶联剂、颜料、抗氧剂和耐热剂等对硅橡胶黄变的影响。研究结果表明：⑴对比研究了3种交联剂对硅橡胶黄变的影响。为控制硅橡胶的黄变程度，建议优先选用甲基三丁酮肟基硅烷（D-30）作为交联剂，并尽量避免硅橡胶长期处于高温环境中。⑵考察了4种硅烷偶联剂对硅橡胶黄变的影响。在脱肟型室温硫化硅橡胶中采用KH-560或者KH-570作为粘接偶联剂时，其黄变程度较低。⑶钛白粉与永固紫颜料配合使用，可有效遮蔽或中和生色基团产生的黄色，改善硅橡胶外观，从而进一步降低黄变程度。⑷抗氧剂和耐热剂搭配使用，具有协同作用，可有效降低硅橡胶在高温环境下的黄变程度。⑸硅橡胶的黄变机理可认为是“自由基氧化反应——致生色基团累积”的模型。通过在脱肟型硅橡胶中增加颜料、抗氧剂和耐热稳定剂，可以大幅度降低硅橡胶在常温和高温环境下的黄变程度，拓宽硅橡胶在5G基站密封材料、新能源汽车电池包防护件等高端领域的应用。

【关键词】硅橡胶；粘接密封胶；硅烷偶联剂；抗氧剂；耐热剂；黄变

一种应用于新能源电池领域的生物基聚氨酯结构胶的制备及研究

李仁普，张志军，刘  斌，陆春兰，周  刚

（广东普赛达材料科技股份有限公司，广东东莞  523646）

【摘 要】本文以多羟基蓖麻油、长链蓖麻油、生物基预聚体为原料，分别制备多元醇（A）组分及固化剂异氰酸酯（B）组分，以体积比V_A∶V_B=1∶1进行混合，固化后得到生物基聚氨酯材料。通过红外、表干时间、硬度、拉伸强度及断裂伸长率、剪切强度测试、“双85”耐候测试表征所制备的生物基聚氨酯的性能。研究结果表明：⑴当多羟基蓖麻油的含量为30%（相对于A组分质量而言）时，材料的表干时间为33 min，硬度为60D，拉伸强度为13.7 MPa，最大伸长率为68%，剪切强度为14.0 MPa，“双85”耐候性衰减率为5.1%。⑵当长链蓖麻油的含量为30%（相对于A组分质量而言）时，材料的生物基含量较高，表干时间为37 min，硬度为57D，拉伸强度为11.7 MPa，最大伸长率为73%，剪切强度为13.4 MPa，“双85”耐候性衰减率不超过10%。⑶当生物基预聚体的含量为60%（相对于B组分质量而言）时，材料的生物基含量较高，表干时间为36 min，硬度为62D，拉伸强度为14.2 MPa，最大伸长率为63%，剪切强度为14.1 MPa，“双85”耐候性衰减率不超过10%。⑷综上所述，当多羟基蓖麻油含量为30%、长链蓖麻油含量为30%、生物基预聚体含量为60%时，所制备的生物基聚氨酯材料的生物基含量相对最高，综合性能相对最优。

【关键词】新能源电池；生物基；聚氨酯；结构胶

PAPI增容高性能PBAT/PPC/PLA复合薄膜的制备和性能研究

高  远，沈  星

（南京航空航天大学航空学院，江苏南京  210016）

【摘 要】“白色污染”与能源危机问题使得开发功能化可降解高分子材料成为一项紧迫的战略需求。聚己二酸对苯二甲酸丁二醇酯（PBAT）具备优异的韧性、良好的加工性能以及可完全生物降解的特性，但其拉伸性能、气体阻隔性能及抗紫外老化能力较差，限制了其广泛应用。将PBAT与其他可降解高分子材料共混，并引入光稳定剂，是改善上述性能问题的有效途径。本研究通过挤出共混与流延成膜工艺，制备了不同配比的PBAT/PPC/PLA复合薄膜。在共混体系中加入了反应性增容剂多苯基多亚甲基多异氰酸酯(PAPI)，系统分析了复合材料的微观结构与各项性能。研究结果表明：⑴简单的三元共混对材料性能提升有限，而引入PAPI可显著改善体系的综合性能。当各组分配比为m(PBAT)∶m(PPC)∶m(PLA)∶m(PAPI)=60∶30∶10∶0.7时，复合薄膜的拉伸强度、杨氏模量及水蒸气阻隔性能相较于纯PBAT薄膜分别提升了59%、122%和62%。⑵流变测试与扭矩分析表明，增容剂PAPI能够与PBAT、PPC、PLA发生扩链反应，其反应活性高于增容剂ADR4468。⑶红外光谱、扫描电镜及动态力学分析结果进一步表明，PAPI有效增强了共混组分之间的相容性，并促进了PBAT的结晶行为。⑷PAPI对复合薄膜的透明性影响较小，在基本保持原有透明度的同时，延缓了材料的降解速率。⑸综上所述，PAPI作为一种高效的反应性增容剂，显著优化了PBAT/PPC/PLA复合薄膜的结构与综合性能。

【关键词】PBAT薄膜；可生物降解薄膜；反应性增容剂

Marine mussel-inspired self-healing polymeric adhesive with strong dry/wet adhesion

Yang Haoyu^1,2, Zhang Qing¹, Huang Jijun¹

(1.College of Materials Science and Opto-Electronic Technology, University of Chinese Academy of Sciences, Beijing 100049, China; 2.Department of Chemical and Materials Engineering, University of Alberta, Alberta, Canada)

【Abstract】Inspired by the extraordinary adhesion properties of mussel adhesion proteins, researchers have introduced the main functional group dopamine (mainly catechol groups) in mussel adhesion proteins into polymer materials, synthesizing many biomimetic polymer materials with different molecular structures and functions, significantly expanding their application scope.The composition and function of mussel foot silk protein were first described in this article, then the current applications of mussel biomimetic materials in underwater adhesive, self-healing materials, anti-fouling materials, and biomedical materials were introduced. Finally, the application prospects of mussel biomimetic materials were provided.

【Keywords】mussel biomimetic; adhesion protein; dopamine; catechol; functional polymer

Research status of addition-type silicone optical adhesive

Wang Dongzhe,Zhuang Rui,Chen Dianlong,Zhang Jingjing,Huang Rui,Li Rui,Wang Yuanrong,Su Yaping

(Yellow River Delta Chambroad Institute Company Limited, Binzhou 256600, Shandong, China;)

【Abstract】The hydrosilylation reaction is an important method for synthesizing silicone compounds, and its typical application in the field of optical adhesive is the addition-type silicone optical adhesive. This type of material is widely used in fields such as electronics, electrical engineering, and optics due to its excellent performance. Taking high refractive index addition-type silicone optical adhesive as the research object, the research progress of its key components (vinyl polysiloxane, hydrogen containing crosslinking agent, catalyst, and reinforcing filler) was systematically reviewed in this article, and the influence of key factors such as the molar ratio of Si—H and Si—V and curing procedures on product performance was deeply analyzed. On this basis, further prospects were made for the future development direction of this material.

【Keywords】hydrosilylation reaction; silicone; optical adhesive; high refractive index

A study on low-temperature curing thiol-epoxy/episulfide adhesive based on photo base generator catalysis

Yang Yutong¹, Li Zhiquan^1,2, Liu Xiaoxuan^1,2

（1.Guangdong Provincial Key Laboratory of Functional Soft Condensed Matter, Guangzhou  510006, Guangdong, China; 2.School of Materials and Energy, Guangdong University of Technology, Guangzhou 510006, Guangdong, China）

【Abstract】A thiol-epoxy/episulfide curing system based on photo base generator catalysiswas developed in this study to solve the problems of poor storage stability and high post-curing temperature in traditional photo base generator catalyzed adhesive systems. A highly active episulfide monomer (BADGE-S) was synthesized by nucleophilic substitution reaction between potassium thiocyanate (KSCN) and bisphenol A diglycidyl ether (BADGE), and was compounded with BADGE and tetra(3-mercaptobutyric acid) pentaerythritol ester (PE-1) crosslinking agent. A novel thiol epoxy/ episulfide photopolymerization system triggered by 365 nm LED was constructed by introducing photo base generator (PB-DBU) and photosensitizer 2-isopropylthioanthraquinone (ITX). A photo curing adhesive with high storage stability, low-temperature rapid curing, and excellent bonding strength was prepared, and its various properties were characterized. The research results showed that, ⑴Multiple characterizations such as FT-IR and NMR confirmed that the epoxy groups were completely converted into episulfide structure. Compared with epoxy precursors, BADGE-S exhibited higher base catalytic activity due to its lower ring opening energy barrier of episulfide groups and easier polarization of sulfur atoms towards electrons, providing an ideal monomer for subsequent low-temperature rapid curing. ⑵The study of light absorption performance showed that PB-DBU was only absorbed by deep ultraviolet light sources. After introducing ITX, the system exhibited broad and strong absorption at 350-400 nm, with an extinction coefficient of 6.86×10³ L/(mol cm) at 383 nm. The triplet state (³ITX*) lifetime was extended, and the sensitization efficiency was improved. Under 365 nm LED irradiation, a single electron transfer occurred from ³ITX* to PB-DBU, causing the C—N bond to break. Within 3.5 min, the pH increased from 7.8 to 9.5 and stabilized. Phenol red color change simultaneously confirmed the rapid release of DBU, providing strong base catalysis for subsequent low-temperature thiol-epoxy/episulfide click polymerization. ⑶Through the study of polymerization kinetics, it was found that as the content of episulfide monomer increased to 20%, the peak polymerization temperature of the system decreased from 173 ℃ to 165 ℃, and the epoxy conversion rate increased from 13.81% to 53.33% after light irradiation. The bonding strength significantly increased by nearly 10 times under low-temperature conditions of 80 ℃ (from 0.164 MPa to 1.532 MPa). ⑷Through the study of storage stability, it was confirmed that the PB-DBU photo base generator system exhibited excellent storage stability, maintaining low viscosity even after 144 h of storage at 40 ℃ in the dark, which was significantly better than the commercial PL-DBN system. ⑸The thiol-epoxy/episulfide curing system based on photo base generator catalysis constructed in this study combined high storage stability, low-temperature curing characteristics, and excellent bonding properties, providing a new material selection for precision electronic packaging and optical device assembly.

【Keywords】photo base generator; episulfide; thiol-epoxy; low-temperature curing; adhesive

Preparation and curing kineticsstudy of a new high-performance epoxy/BAPP-BMI adhesive

Wen Manying, Fan Tianhua, Yu Xinhai

(College of Chemistry and Chemical Engineering, Donghua University, Shanghai 201620, China)

【Abstract】Long chain ether bonded 2,2-bis[4-(4-maleimidophenoxy) phenyl] propane (BAPP-BMI) was synthesized by using 2,2-bis [4-(4-aminophenoxy) phenyl] propane (BAPP) and maleic anhydride (MA) as raw materials. A series of epoxy/BAPP-BMI adhesive were prepared by mixing bisphenol A-type epoxy resin (E-51), self-made BAPP-BMI, epoxy chain extender (SD-248), curing agent (MTHPA), and curing accelerator (2E4MI), and their structures and properties were analyzed. The research results showed that BAPP-BMI monomer was successfully synthesized, and its structure was confirmed by FT-IR, which was then used to prepare epoxy/BAPP-BMI adhesive. Moderate addition of BAPP-BMI could significantly improve the comprehensive performance of the cured material. It exhibited high reactivity at 30 ℃, with a maximum tensile shear strength of 15.4 MPa, and effectively improved the toughness (67% increase in maximum impact strength), mechanical strength, and hydrophobicity (water absorption rate<0.10%, with a minimum of 0.02%) of the material. The curing kinetics analysis showed that the activation energy of the reaction was 77.52 kJ/mol, and the reaction order was 0.9. Meanwhile, this series of adhesive exhibited stable low dielectric constant (3.84-4.26) and low dielectric loss (2.02%-2.20%) at high frequencies, with capacitance values ranging from 4.97-5.52 pF, demonstrating excellent dielectric properties and potential applications in fields such as electronic packaging.

【Keywords】BAPP-BMI; adhesive; mechanical property; dielectric property; curing kinetics

Research on toughening and flame retardant modification of melamine-formaldehyde resin adhesive

Feng Yan¹, Mashanlo Abdurakhman¹, Lin Zhiqian¹, Shen Jiahao¹, Chen Fengqing^1,2, Dai Jinfeng^1,2

(1.College of Chemistry and Materials Engineering, Zhejiang A&F University, Hangzhou 311300, Zhejiang, China; 2.Key Laboratory of Wood Science and Technology of Zhejiang Province, Hangzhou  311300, Zhejiang, China)

【Abstract】Despite exhibiting good heat resistance, the high brittleness of melamine-formaldehyde (MF) resin adhesive restricted its utilization in impregnated paper decorative materials. In this study, polyborosiloxane (PBS) was synthesized by polycondensation of boric acid and hydroxysilicone oil, and was used to modify MF for toughning and flame retardancy. The influence of PBS addition amount on the mechanical properties, flame retardancy and toughness of modified MF adhesive was systematically investigated. The research results showed that the Si—O—B flexible segments in PBS significantly enhanced the toughness of MF through physical entanglement and hydrogen bonding, and the bonding strength and flame retardancy of modified MF adhesive were both enhanced. When the PBS addition amount was 5%, the limit oxygen index (LOI) of modified MF sample reached 34.3%, which was 4.6% higher than that of pure MF. The burning through time of impregnated paper veneer was extended to 106 seconds (an increase of 253%). The dry/wet bonding strength reached 2.98 and 3.11 MPa, respectively, an increase of 36.1% and 5.8% compared to pure MF. Meanwhile, the elongation at break of 5% PBS modified MF increased from 4.2% to 26.5%, demonstrating excellent flexibility and crack resistance. This study provided a new strategy for developing MF adhesive with high strength, high toughness, and flame retardant properties, which was of great value for expanding the application of MF adhesive in customized decorative materials.

【Keywords】melamine-formaldehyde resin; polyborosiloxane; toughening modification; flame retardancy

Factors affecting yellowing of room-temperature vulcanized silicone rubber

Liu Bin, Qin Ying, Cao Junru, Zhao Zhipeng,Xie Zhijian, Wang Yunran

(1.China Bluestar Chengrand Chemical Co., Ltd., Chengdu 610041, Sichuan, China;2.National Silicone Engineering Technology Research Center, Chengdu  610041, Sichuan, China)

【Abstract】One-component room-temperature vulcanized silicone rubber was prepared by using hydroxyl-terminated polydimethylsiloxane as the base polymer, fumed silica as the reinforcing filler, ketoxime silane as the crosslinking agent, and dibutyltin dilaurate as the catalyst. The effects of ketoxime crosslinking agent, silane coupling agent, pigment, antioxidant, and heat-resistant agent on the yellowing of silicone rubber were investigated. The research results showed that, ⑴ A comparative study was conducted on the effects of three crosslinking agents on the yellowing of silicone rubber. To control the yellowing degree of silicone rubber, it was recommended to prioritize the use of methyl tributone oxime silane (D-30) as a crosslinking agent and avoid prolonged exposure of silicone rubber to high temperature as much as possible. ⑵The influence of four silane coupling agents on the yellowing of silicone rubber was investigated. When KH-560 or KH-570 was used as an adhesive coupling agent in deoxime-type room-temperature vulcanized silicone rubber, the yellowing degree was relatively low. ⑶The combination of titanium dioxide and permanent purple pigment could effectively mask or neutralize the yellow color generated by chromophores, improved the appearance of silicone rubber, and further reduced the degree of yellowing. ⑷ The combination of antioxidant and heat-resistant agent had a synergistic effect, which could effectively reduce the yellowing degree of silicone rubber in high temperature environment. ⑸The yellowing mechanism of silicone rubber could be considered as a model of "free radical oxidation reaction - accumulation of chromophores". By adding pigment, antioxidant, and heat-resistant stabilizer to deoxime-type silicone rubber, the yellowing degree of silicone rubber at room temperature and high temperature could be significantly reduced, and the application of silicone rubber in high-end fields such as 5G base station sealing materials and new energy vehicle battery pack protective parts could be expanded.

【Keywords】silicone rubber; bonding sealant; silane coupling agent; antioxidant; heat-resistant agent; yellowing

Preparation and research of a bio-based polyurethane structural adhesive applied

in the field of new energy battery

Li Renpu, Zhang Zhijun, Liu Bin, Lu Chunlan, Zhou Gang

(Guangdong Pustar Material Technology Co., Ltd., Dongguan  523646, Guangdong, China)

【Abstract】Polyol (A) component and curing agent isocyanate (B) component were prepared, respectively in this article by using polyhydroxy castor oil, long-chain castor oil, and bio-based prepolymers as raw materials. The bio-based polyurethane material was obtained by mixing with a volume ratio of V_A∶V_B=1∶1 after curing. The properties of the prepared bio-based polyurethane were characterized through infrared spectroscopy, surface drying time, hardness, tensile strength and elongation at break, shear strength, and "double 85" weather resistance testing. The research results showed that, ⑴ When the content of polyhydroxy castor oil was 30% (relative to the mass of component A), the surface drying time of the material was 33 min, the hardness was 60D, the tensile strength was 13.7 MPa, the maximum elongation at break was 68%, the shear strength was 14.0 MPa, and the "double 85" weather resistance attenuation rate was 5.1%. ⑵ When the content of long-chain castor oil was 30% (relative to the mass of component A), the bio-based content of the material was high, the surface drying time was 37 min, the hardness was 57D, the tensile strength was 11.7 MPa, the maximum elongation at break was 73%, the shear strength was 13.4 MPa, and the "double 85" weather resistance attenuation rate did not exceed 10%. ⑶ When the content of bio-based prepolymer was 60% (relative to the mass of component B), the bio-based content of the material was high, the surface drying time was 36 min, the hardness was 62D, the tensile strength was 14.2 MPa, the maximum elongation at break was 63%, the shear strength was 14.1 MPa, and the "double 85" weather resistance attenuation rate did not exceed 10%. ⑷ In summary, when the content of polyhydroxy castor oil was 30%, the content of long-chain castor oil was 30%, and the content of bio-based prepolymer was 60%, the bio-based polyurethane material prepared had the relatively highest bio-based content and the relatively best comprehensive performance.

【Keywords】new energy battery; bio-based; polyurethane; structural adhesive

Preparation and properties of high performance PBAT/PPC/PLA composite films compatibilized with PAPI

Gao Yuan, Shen Xing

(College of Aerospace Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016 Jiangsu, China)

【Abstract】The issues of “white pollution” and energy crisis have made the development of functionalized biodegradable polymer materials an urgent strategic need. Polybutylene adipate terephthalate (PBAT) has excellent toughness, good processability, and complete biodegradability, but its tensile properties, gas barrier properties, and UV aging resistance are poor, limiting its widespread application. Blending PBAT with other biodegradable polymer materials and introducing light stabilizers are effective ways to improve the aforementioned performance issues. PBAT/PPC/PLA composite films with different ratios were prepared in this study by using extrusion blending and casting processes. Reactive compatibilizer polyaryl polymethylene isocyanate (PAPI) was added to the blending system, and the microstructure and various properties of composite materials were systematically analyzed. The research results showed that, ⑴ Simple ternary blending had limited improvement on material properties, while introducing PAPI could significantly improve the overall performance of the system. When the component ratio of each group was m(PBAT): m(PPC): m(PLA): m(PAPI)=60:30:10:0.7, the tensile strength, Young's modulus, and water vapor barrier performance of composite films were improved by 59%, 122%, and 62%, respectively, compared to pure PBAT film. ⑵Rheological testing and torque analysis indicated that the compatibilizer PAPI could undergo chain extension reactions with PBAT, PPC, and PLA, and its reaction activity was higher than that of the compatibilizer ADR4468. ⑶ The results of infrared spectroscopy, scanning electron microscopy, and dynamic mechanical analysis further indicated that PAPI effectively enhanced the compatibility between the blending components and promoted the crystallization behavior of PBAT. ⑷ PAPI had a relatively small impact on the transparency of composite films, and while maintaining the original transparency, it delayed the degradation rate of the material. ⑸ In summary, PAPI as an efficient reactive compatibilizer, significantly optimized the structure and comprehensive properties of PBAT/PPC/PLA composite films.

【Keywords】PBAT film; biodegradable film; reactive compatibilizer