选取可溶性聚酰亚胺(PI)作为有机高聚物基 体,通过正硅酸四乙酯(TEOS)在聚酰胺酸(PAA)的N-甲基-2-吡咯烷酮(NMP)溶液中进行溶 胶-凝胶反应,制备出新型的聚酰亚胺／二氧化硅(PI／SiO2)纳米复合材料。并用UV-Vis 、FT-IR、SEM和光子相关法等对其溶胶-凝胶转变过程、二氧化硅微相结构的变化进行了 研究,并对溶液中粒子间的团聚行为作了进一步探讨。结果表明随着处理温度的升高,PAA逐 步亚胺化,同时TEOS水解后的硅羟基(Si-OH)逐步缩合,由线型结构向环状结构过渡,原位生成SiO2凝胶网络。实验结果还发现热处理温度的升高对二氧化硅无机粒子的尺寸无明显的影 响,而光子相关法结果则表明颗粒表面活性Si-OH的存在是引起团聚的一个重要因素。
A new class of soluble polyimide／silica hybrid films or solutions were prepared by the sol-gel reaction staring from tet raethoxysilane(TEOS) in the solution of polyamic acid in N-methyl-2-pyrrolido ne. The hybrid films or solutions were obtained by the hydrolysis-polycondensat ion of TEOS in the polyamic acid solution, followed by heating at 270 ℃. UV-Vis, FT-IR, SEM and photon correlation spectorscopy(PCS) were used to monitor the process of sol-gel transition and the microstructural evolution of a silicon oxide phase in the soluble polyimide／silica nanocomposites. Furthermore, the asp ects of coalescence of inorganic particles in the solutions were also investigated. The result shows that with the raising of curing temperature, the hydrolysis product silanol(Si-OH) begins to polycondense gradually, from linear structure to cyclic structure, till forming SiO2 net work accompanied with imidization of polyamic acid(PAA).
参考文献
| [1] | 王文中;李良荣;LIU Xin long .[J].材料导报,1994,6(06):8-10. |
| [2] | Livage J.[J].Materials Science Forum,1994:152-153;43-54. |
| [3] | Hench L L;West J K .[J].Chemical Reviews,1990,1:33-72. |
| [4] | Landry Christine J T;Coltrain Bradley K;Weson Jeffrey A .[J].POLYMER,1992,33:1496-1506. |
| [5] | Morikawa A;Iyoku Y .[J].Polymer Journal,1992,24:107-113. |
| [6] | 陈艳;高宗明;朱晓光 .[J].高分子学报,1997,1(01):73-79. |
| [7] | Mascia L.;Kioul A. .INFLUENCE OF SILOXANE COMPOSITION AND MORPHOLOGY ON PROPERTIES OF POLYIMIDE-SILICA HYBRIDS[J].Polymer: The International Journal for the Science and Technology of Polymers,1995(19):3649-3659. |
| [8] | Kioul A;Mascia L .[J].Journal of Non-Crystalline Solids,1994,175:169-186. |
| [9] | Nandi M;Conklin J A;Salvati L et al.[J].Chemistry of Materials,1990,2:772. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%