带双侧烷基蓖麻油聚氨酯的氢键及其耐湿热性能  

Hydrogen Bonding,Heat and Humidity Resistance of Castor-Oil-Based Polyurethane with Bilateral Alkyl Side Groups

作　　者：曾妍 易玉华[1] ZENG Yan;YI Yuhua(College of Mechanical&Automotive Engineering,South China University of Technology,Guangzhou 510641,China)

机构地区：[1]华南理工大学机械与汽车工程学院,广东广州510641

出　　处：《塑料工业》2024年第5期77-82,123,共7页China Plastics Industry

摘　　要：为了改善生物质蓖麻油基聚氨酯(CO—PU)的韧性和耐湿热性能,通过CO与聚己二酸-2-丁基-2-乙基-1,3丙二醇酯二醇(PBEPG)组成混合软段制备聚氨酯(PU)材料,在PU分子主链上引入对称双疏水烷基。红外光谱(FTIR)分析、动态力学分析(DMA)和热重分析(TG)结果表明,随PBEPG质量分数的提高,PU软硬段间微相分离程度提高,玻璃化转变温度降低,最大热降解温度提高。当CO∶PBEPG(质量比)为70∶30时,PU的断面形貌为韧性断裂,拉伸强度为21.4 MPa,相对湿度100%、100℃环境下老化60 h后拉伸强度保持率为90%,表现出较高的力学强度和耐湿热性能。In order to improve the toughness,heat and humidity resistance of castor-oil-based polyurethane(CO—PU),the PU samples with symmetrical bishydrophobic alkyl groups were prepared by using a mixed soft segment composed of CO and poly(adipic acid-2-butyl-2-ethyl-1,3-propanediol)glycol(PBEPG).The results of Fourier transform infrared spectroscopy(FTIR),dynamic mechanical analysis(DMA)and thermogravimetry analysis(TG)reveal that,with the increase of PBEPG mass fractions,the degree of microphase separation between soft and hard segments of PU is improved,the glass transition temperature of PU is decreased,and the maximum thermal degradation temperature of PU is increased.When CO∶PBEPG(mass ratio)is 70∶30,the PU sample exhibits ductile fracture,its tensile strength is 21.4 MPa,and its tensile strength remains 90%after aging at relative humidity of 100%and 100℃for 60 h,showing high mechanical strength,heat and humidity resistance.

关 键 词：蓖麻油基聚氨酯 烷基侧基 耐湿热性能 氢键 

分 类 号：TQ323[化学工程—合成树脂塑料工业]