支化度对TAP-BFDA聚酰亚胺的性能影响研究  

Effect of Degree of Branching on Performance of TAP-BFDA Polyimides

作　　者：陈营 魏燕红 陈德平 周红梅[1] CHEN Ying;WEI Yanhong;CHEN Deping;ZHOU Hongmei(School of Materials and Environmental Engineering,Chengdu Technological University,Chengdu 610031,China)

机构地区：[1]成都工业学院材料与环境工程学院,成都610031

出　　处：《材料导报》2022年第23期229-233,共5页Materials Reports

基　　金：四川省科技计划项目(2019YJ0376)。

摘　　要：通过在高分子链中引入超支化结构来改善芳香族聚酰亚胺的加工性能,而不损害它们的热性能,合成了超支化聚酰亚胺。这类聚合物同时具有超支化和酰亚胺结构,使得自身具有两者的综合性能,因而在航空、航天、微电子等领域具有广阔的应用前景。然而,不同支化度对超支化聚酰亚胺结构与性能的影响鲜有报道。鉴于此,本研究以TAP为三胺单体、BFDA为二酐单体,两种单体采用七种不同的物质的量比1∶1、1∶1.2、1∶1.4、1∶1.5、1∶1.6、1∶1.8、1∶2,通过“二步法”制得了七种超支化聚酰亚胺。利用核磁氢谱分析对聚合物的支化度进行了计算,七种聚酰亚胺的支化度分别为27%、36%、51%、60%、65%、69%和74%。结果表明:随着支化度的提高,产物结晶构造的晶格间距(d-spacing)增大,数均分子量和特性粘度大致呈现为先升高后略有降低的变化趋势;所得超支化聚酰亚胺具有优异的溶解性能和较好的热性能,并且随着支化度的提高,溶解性能提高,玻璃化转变温度(T)降低,5%热失重温度升高。Hyperbranchede polyimide improves the processability of aromatic polyimide by introducing hyperbranched structures into polymer chains, while maintaining their thermal properties;therefore, it has been widely used in the fields of aeronautics, astronautics and microelectronics. However, the effects of different degree of branching on the properties of hyperbranched polyimide have rarely been reported. In view of this, seven kinds of hyperbranched polyimides were synthesized based on TAP astriamine monomer and BFDA as dianhydride monomer, with the molar ratios of TAP ∶BFDA being 1∶1,1∶1.2,1∶1.4,1∶1.5,1∶1.6,1∶1.8,1∶2.The DB of the obtained polyimides indicated by ~1H NMR was 27%,36%,51%,60%,65%,69% and 74%. Results show that with DB increasing, the d-spacing values increase, while the Mand inherent viscosities firstly increase then slightly decrease. All of the products exhibite good solubility. With DB increasing, the solubility increases. All of the obtained polyimides show good thermal properties. With DB increasing, Tdecreases, while 5% weight loss temperatures increases.

关 键 词：聚酰亚胺 支化度 溶解性 热性能 

分 类 号：O63[理学—高分子化学]