摘要
以4,4′-二氨基二苯甲烷(MDA)为二胺单体,均苯四甲酸酐(PMDA)和3,3′,4,4′-二苯酮四羧酸二酐(BTDA)为二酐单体,低温溶液聚合生成一种共缩聚聚酰胺酸(PAA).然后亚胺化脱水环化生成共缩聚聚酰亚胺.通过特性粘度([η])、红外光谱(FT—IR)、热重分析(TG)和X衍射分析(XRD)等对聚合物进行了一系列的结构表征和性能测试.FT-IR表明,在1777 cm^(-1)和1723 cm^(-1)处观察到聚酰亚胺特征峰;TG表明.PI的10%热失重温度为568℃;XRD表明,PI的结晶度较低且分子链间距d为0.5069 nm.
The co-polycondensation type polyamic acid (PAA) was synthesized using 4, 4'- diaminodiphenylmethane (MDA) as diamine monomer, 3, 3', 4, 4'-benzoph-enonetetracarboxylic dianhydride (BDTA) and pyromellitic acid dianhydride (PMDA) as dianhydride monomers under conventional heating solution polycondensation. Then PAA came into being polyimide (PI) by an imidization at low-temperature. It was characterized by inherent viscosity ([η]), fourier transform infrared (FT-IR), thermogravimetric curve (TG) analyses and X-ray diffraction (XRD). The FT-IR results were shown that, there were Pl's characteristic peaks around 1 777 cmI and 1 723 cm^-1, Thermogravimetric curve indicated that, PI's 10% thermal decomposition temperature under N2 was 568℃. XRD spectrum demonstrates that obtained polyimide has low-order aggregation structure with a d-spacing of 0. 506 9 nm.
出处
《湖北大学学报(自然科学版)》
CAS
北大核心
2007年第4期384-386,共3页
Journal of Hubei University:Natural Science
基金
湖北省杰出人才基金(№.2004ABB003)资助项目
关键词
共缩聚
聚酰亚胺
合成
表征
co-polycondensation
polyimide
synthesis
characterization