原位聚合法制备聚酰亚胺／纳米二氧化硅杂化膜  

Polyimide/nano-SiO_2 Hybrid Films Prepared by In-situ Polymerization

作　　者：程井动[1] 王聪[1] 韩克清[1] 余木火[1] 

机构地区：[1]东华大学,纤维材料改性国家重点实验室,材料科学与工程学院,上海201620

出　　处：《材料科学与工程学报》2008年第6期927-931,共5页Journal of Materials Science and Engineering

摘　　要：溶胶-凝胶法是目前广泛被采用的制备聚酰亚胺/二氧化硅杂化膜的方法,此法通常是由PI的前驱体(如聚酰胺酸)和经水解缩合而成的二氧化硅溶胶制得。该方法制备的杂化膜普遍存在二氧化硅粒径较大且由于水的参与造成前驱体的稳定性偏低等缺点。本文以工业硅溶胶为硅源,首先制备了无水二氧化硅N,N-二甲基乙酰胺(DMAC)分散液,再以均苯四甲酸二酐(PMDA)、4,4′-二氨基二苯醚(ODA)为原料,采用原位聚合法制备了聚酰亚胺/纳米二氧化硅杂化膜,此方法克服了溶胶-凝胶法的缺点。利用FT-IR、SEM等手段对杂化膜的化学结构和形态进行了表征,证实杂化膜的热亚胺化较为完全,SiO2粒子以纳米尺度均匀地分布于聚酰亚胺基体中。动态力学分析表明随着二氧化硅含量的增加,杂化膜的Tg随之升高。另外,杂化膜的力学性能也有了很大改善。Polyimide/silica （PI/SiO2） hybrid membranes were previously prepared by the sol-gel reaction starting from silica sol in the solution of aromatic polyamic acid. But, the dispersibility of silica and the stability of PAA/SiO2 solution by the traditional reaction were not satisfactory. In this article, a new nano SiO2/N, N-dimethylacetamide （DMAC） solution was first prepared. Then, the novel PI/SiO2 hybrid film was fabricated by reacting of 4, 4＇-oxydianiline （ODA） and pyromellitic dianhydride （PMDA） in this novel SiO2/DMAc solution. The chemical structure of polyimide/silica membranes was analyzed by FT-IR spectroscopy and the results show that the amine groups were completely imidiged. The morphology of composites were characterized by SEM and the results indicate that the silica particles dispersed homogeneously in polyimide films. The glass transition temperature （Tg） of the hybrid membranes increased with the enhancement of silica content. Furthermore, the mechanical properties of the hybrid membranes were improved owing to the addition of silica particles.

关 键 词：聚酰亚胺 硅溶胶 原位聚合 

分 类 号：TQ323.7[化学工程—合成树脂塑料工业]