摘要
使用二元酐均苯四甲酸二酐(PMDA)与不同摩尔比例的两种二元胺4,4’-二氨基二苯醚(ODA)和1,3-双(4-氨基苯氧基)苯(TPER)共聚制备了一系列聚酰亚胺(PI)薄膜,并通过乌氏粘度计、X-射线衍射仪(XRD)、环境扫描电镜(SEM)、热失重分析(TGA)对其性能进行了分析表征。结果表明,TPER的引入使PI薄膜由非晶状态转化为半结晶状态,TPER分子中的柔性链提高了PI薄膜的韧性,并且当TPER含量较少时,由于结晶的综合作用,得到的PI薄膜表现出优异的热稳定性,N2气氛下5%失重温度达到558℃。
Four polyimides were synthesized via copolymerization of pyromellitic dianhydride（PMDA）,4,4＇-diaminodiphenyl（ODA） and 1,3-bis（4-aminophenoxy）benzene（TPER） at different monomer ratios.Their properties were characterized by Ubbelohde viscometer,XRD,SEM and TGA.The results showed that the introduction of TPER caused the change of PI films from amorphous to semicrystalline,and also the toughness of PI films was improved by the flexibel chain in the TPER molecules.When the TPER content was low,due to the cooperative effect of crystalline,the excellent thermal stability of PI films was displayed and the 5% weight loss temperature was 558℃ in N2.
出处
《航空材料学报》
EI
CAS
CSCD
北大核心
2011年第3期86-89,共4页
Journal of Aeronautical Materials
关键词
共聚
聚酰亚胺
结晶
韧性
热稳定性
copolymerization
polyimide
crystalline
toughness
thermal stability
