SYNTHESIS AND PROPERTIES OF ALPHA,OMEGA-DIAMINOALKANE BASED POLYIMIDES

被引:38
作者
KONING, C
TEUWEN, L
MEIJER, EW
MOONEN, J
机构
[1] DSM Research, 6160 MD Geleen
关键词
SEMI-ALIPHATIC POLYIMIDES; POLY(BTDA-DAB); SEMICRYSTALLINE POLYIMIDES;
D O I
10.1016/0032-3861(94)90748-X
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
Twenty semicrystalline polyimides based on well-known aromatic dianhydrides and aliphatic alpha,omega-diamines have been synthesized and characterized. Poly(BTDA-DAB) synthesized in a two-step process from 3,3',4,4'-benzophenonetetracarboxylic dianhydride (BTDA) and 1,4-diaminobutane (DAB) exhibits a rather exclusive balance between thermal/mechanical properties and processability. In the series of alpha,omega-diamines and BTDA the glass transition temperature (T(g)) increases linearly with the decrease in CH2 units, while the melting temperature (T(m)) shows the well-known odd-even effect. For the as-synthesized poly(BTDA-DAB) T(g) and T(m) are 175 and 277-degrees-C, respectively. After melt processing a sharp decrease in crystallinity is observed with X-ray and d.s.c., however annealing of injection moulded test bars results in a higher crystallinity. The semicrystalline poly(BTDA-DAB) exhibits interesting mechanical properties, e.g. a G' modulus of 1.7 kN mm-2 and an Izod impact of 3.4 kJ m-2.
引用
收藏
页码:4889 / 4895
页数:7
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