摘要
用动态力学振簧仪、DSC、FT IR、光辐照、浸水降解法研究了马来酸酐化线型低密度聚乙烯 (MPE) /聚己内酯 聚乙二醇共聚物 (PCE)共混物的组分相容性、晶区的熔化和结晶行为以及降解特性 .结果表明 ,马来酸酐化是发生在LLDPE短支链的甲基末端上并通过马来酸酐与PCE的羟基形成氢键相互作用 ,使两组分存在部分相容性 ,PCE的主转变与MPE支链的 β转变发生内移现象 .在共混物中加入乙烯 丙烯酸共聚物(EAA)可以起增容作用 ,同时使MPE和PCE组分的熔点和熔化热进一步下降 .对不同含量PCE的MPE/PCE/EAA共混物的降解特性的研究表明 ,PCE的加入使体系发生光、水降解 ,且随PCE含量的增加降解速度加快 .光 水联合作用的降解速度比单一光或水降解更快 .
The compatibility of components, melting and crystallization behavior as well as degradations of blends for maleated LLDPE(MPE)/poly(epsilon -caprolactone)-poly( oxyethylene) copolymer(PCE) have been investigated by vibrating reed, DSC and FTIR. The degradations are characterized by the retention of tensile properties. The results show that the maleation reaction occurs at the methyl end group of the short-chain branching of LLDPE, resulting hydrogen interaction between maleic anhydride and hydroxyl group of PCE. This type of the interaction causes a partial compatibility between the blend components, as indicated by an inward shifting of the glass transition of PCE and beta transition of MPE. Introduction of ethyl-acrylic acid copolymer(EAA)in the blends further depresses the melting paint, reduces the melting enthalpy and enhances the compatibility of components. The photo- and hydrolytic degradations of MPE/EAA/PCE blends increase with PCE content. The rate of a combination of the photo-hydrolytic degradation is more rapid than that of the individual degradations of photo- or hydrolytic nature.
出处
《高分子学报》
SCIE
CAS
CSCD
北大核心
2001年第1期73-78,共6页
Acta Polymerica Sinica
基金
国家自然科学基金!项目 (基金号 5 97730 2 2 )
关键词
马来酸酐化聚乙烯
聚己内酯
聚乙二醇醚
共聚物
相容性
光-水联合降解
maleated polyethylene
poly(epsilon-caprolactone)-poly(oxyethylene) copolymer
compatibility
combination of photo-hydrolytic degradation
