毕业设计说明书中文摘要本文分别采用均苯四甲酸二酐(PMDA)、3,3',4,4'-联苯二酐(BPDA)和3,3',4,4'-氧双邻苯二甲酸酐(ODPA)为二酐单体，4,4'-二氨基二苯醚(ODA)为二胺单体，通过两步法制备普通型聚酰亚胺；采用含氟二酐4,4-六氟异丙基邻苯二甲酸酐（6FDA)与普通二酐ODPA作为二酐单体，和含氟二胺2,2'-双三氟甲基-4,4'-二氨基联苯醚(TFODA)反应，制备含氟聚酰亚胺。另按照不同质量分数用超声分散法将纳米TiO2粒子与聚酰胺酸混合，再热亚胺化得到一系列复合薄膜，并对其性能进行研究。结果发现：薄膜的机械强度随着TiO2掺杂量的增加而降低，初始热分解温度上升，薄膜的透过率则明显降低，绝缘性能降低，白度增加。所制备出的复合薄膜是一种具有良好的机械性能、热稳定性能、低导电性能的复合材料，其中含氟PI/TiO2复合薄膜更是一种遮光性更好，白度更高的薄膜。78441

毕业论文关键词  聚酰亚胺  纳米TiO2  两步法  超声分散  性能

毕业设计说明书外文摘要

Title  The preparation and performance of polyimide/titanium dioxide composite films                                         

Abstract In this paper, a series of conventional polymers were respectively prepared with three kinds of dianhydride monomer, 1,2,4,5-benzenetetracarboxylic anhydride (PMDA), 3,3',4,4'-biphenyltetracarboxylic dianhydride(BPDA) and 3,3',4,4'- tetracarboxylicdiphenyl ether dianhydride(ODPA) and ordinary diamine monomer, 4,4'-diaminodiphenyl ether(ODA) via a conventional two-stage process。 Fluorinated polyimides were prepared with fluorine dianhydride 4,4'-(hexafluoroisopropylid- ene) diphthalic anhydride(6FDA) and ODPA and fluorine diamine TFODA。 Ultrasonic dispersion were taken to compound polyamic acid precursor doped with different mass fraction of nano Ti02, then a series of composite films by thermal imidization were obtained, and its performance was studied。 The results showed that the mechanical strength of the films decreased with the increase of TiO2 content, the initial thermal decomposition temperature increased, the transmittance of the films decreased obviously, the insulation performance decreased, and the whiteness increased。 The composite films we prepared have good mechanical properties, thermal stability and low conductivity, and fluorine PI/TiO2 composite films are  higher shading property and whiteness films。

Keywords  polyimide  nano Ti02  two-step method  ultrasonic dispersion  properties

目   次

1  绪论 1

1。1  引言 1

1。2  聚酰亚胺薄膜的发展 1

1。2。1  国外聚酰亚胺薄膜的发展 1

1。2。2  国内聚酰亚胺薄膜的发展 2

1。3  聚酰亚胺的优势 2

1。3。1  优异的综合性能 2

1。3。2  广泛的应用领域 3

1。3。3  原料种类多，合成方法多 3

1。4  含氟聚酰亚胺概述 4

1。5  聚酰亚胺纳米复合材料 5

1。5。1  聚酰亚胺杂化材料 5

1。5。2  聚酰亚胺/纳米复合材料合成方法