Synthesis and Properties of Semi-aromatic Poly(ester-imide)s

• Main Authors: Hung, Tze-Ching, 洪子景
• Other Authors: Chang, Teh-Chou
• Format: Others
• Language: zh-TW
• Published: 1994
• Online Access: http://ndltd.ncl.edu.tw/handle/20800133655276670966

碩士 === 中原大學 === 化學工程研究所 === 82 === In the first part of this study, two series of semi-arom- atic polyester-imides were prepared by direct polycondensation of N-(4-carboxyphenyl trimellitimide) (M1) or N-(3-carboxyphe- nyl trimellitimide)(M2) with various pyromellitic diimide diol containing methylene spacer = 2-6 respectively . The effect of amount of LiCl , pyridine and the kinds of condensation agents on the direct polycondensation were studied . It is found that the P1 polymer series with even methylene spacer (n =4,6) ex- hibits LC phase , but the P2 polymers series does not form LC phase. In the second part of this study, a series of copolymer was prepareed by using copolymerization from N-( 4-carboxyphyl trimellitimid,N-N'-di(hydroxypropyl) pyromellitic diimide (A2) ,and various aromatic diols . It is found that some of the co- polymers exhibits LC phase . Both Tm and Ti Will be decreased as the size of lateral group increased. In the the third part of this study, two series of copolymers were prepared by using coplymerization from phenyl hydroquinone (PhHQ) or 4-4'-biph- enyl diol (BP) and N-N'-di(hydroxypropyl) pyromellitic diimide respectively. When the molar ratio of PhHQ (or BP) to N-N'-di( hydroxypropyl) pyromellitic diimide were higher than 2/3 , the copolymers exhibited LC phase . The mesophase range will be increased with the amount of PhHQ increased. The fouth part of this study, a series of copolymers were polymerization by using N-(4-carboxyphenyl trimellitimide),various imide diols (methy- lene spacer=2-6),and phenyl hydroquinone as the monmers. It is found that the copolymers of this series exhibits LC phase.The odd-even effects for the methylene spacer lengths and transi- tion temperature in the copolymers are not significative . The thermostability is not influenced by the methylene spacr length.