摘要
用化学气相沉积(CVD)聚合法制备了羧基取代聚对亚苯基二亚甲基(PPX-carb)膜,采用FTIR和元素分析的方法证实了其化学结构.对膜溶解性和抗化学氧化性能的研究表明PPX-carb膜仍具有优异的耐溶剂性和抗化学氧化性能.对PPX-carb膜热性能的研究表明羧基的引入使得膜的玻璃化转变温度降低,室温柔性增强,动态力学阻尼性能增大,与聚对亚苯基二亚甲基(PPX)相比引入了羧基的PPX-carb热稳定性有所下降,热降解起始温度比PPX低,但主链降解温度比PPX反而高出约80℃.此外,羧基的引入使得膜的亲水性能大幅度提高,水汽渗透性能也有所提高.
Abstract Poly（p-xylylene）（PPX） prepared by chemical vapor deposition （CVD） polymerization shows promising features like absolute conformation to substrate topology, pinhole-free coverage even in uhrathin films, the ability to penetrate and cover complex geometries, and extraordinarily high chemical inertness and purity compared to common polymer coatings. However, the exploitation of [2.2] paracyclophanes for generating functionalized surfaces is interesting. The functional groups may be useful for further modifications. Poly（carboxyl-p-xylylene-co-p-xylylene） （PPX-carb） was prepared by CVD polymerization in present work. The chemical structure of the resulted polymer was confirmed by FTIR and elemental analysis. It is indicated that PPX-carb membrane has good solvent resistant and high chemical oxidation resistant. Thermogravimetric analysis （ TGA ）, differential scanning calorimetry （ DSC ）, and dynamic mechanical analysis（DMA） were used to study the thermal properties of PPX-carb membranes. It is found that the initial degradation temperature and Tg of PPX-carb membranes are reduced with the introduction of carboxyl group as side groups, while the degradation temperature of the main chain of PPX-carb is higher than that of PPX. With the introduction of carboxyl, the polymer becomes amorphous, and the softness as well as the dynamic mechanical damping properties of PPX-carb are improved. The hydrophilicity and vapor permeability of PPX-carb membranes are also improved.
出处
《高分子学报》
SCIE
CAS
CSCD
北大核心
2006年第4期603-608,共6页
Acta Polymerica Sinica
关键词
化学气相沉积聚合
聚对亚苯基二亚甲基
羧基
亲水性
水汽渗透性
Chemical vapor deposition polymerization, Poly（p-xylylene）, Carboxyl, Hydrophilic, Vapor permeability
