摘要
为了考察分子结构对聚酰亚胺性能的影响,在4,4'-二氨基二苯醚-均苯四甲酸二酐(ODA-PMDA)型聚酰亚胺中引入具有不对称结构的单体3,4'-二氨基二苯醚(3,4'-ODA),制备共聚改性均苯型聚酰胺酸,经热亚胺化得到所需聚酰亚胺。分别用全反射红外光谱仪(FT-IR)、静态热机械分析仪(TMA)、同步热分析仪(TGA)和万能试验机对聚合物性能进行表征。结果表明:随着聚合物中不对称结构单体3,4'-ODA的引入,在保持聚合物优良的耐热性能的同时,溶解性能得到明显改善,玻璃化温度降至314℃,拉伸强度和拉伸模量分别降至91.33和1 536 MPa,加工性能有所提高。
The polyimide was synthesized from asymmetrical monomer 3,4′-oxydianiline（3,4′-ODA）,4,4′-Oxydianiline（ODA） and pyromellitic dianhydride（PMDA） by one-step procedure,to investigate the effect of structure symmetry on the properties of polyimides（PI）.The properties of polyimides were characterized by Fourier transform infrared spectroscopy（FT-IR）,thermomechanical analysis（TMA）,thermogravimetric analysis（TGA）,and universal tester.Results showed that asymmetry enhanced the solubility in organic solvents,reduced the glass transition temperature to 314 ℃,the tensile strength to 91.33 MPa,and elastic modulus to 1 536 MPa.Thus,mechanical properties of PI were improved.
出处
《南京工业大学学报（自然科学版）》
CAS
北大核心
2012年第2期44-47,共4页
Journal of Nanjing Tech University(Natural Science Edition)
