Studies on a miscible polyimide blend

被引:15
作者
Campbell, JA [1 ]
Goodwin, AA [1 ]
Mercer, FW [1 ]
Reddy, V [1 ]
机构
[1] RAYCHEM CORP,RES & DEV,MENLO PK,CA 94025
关键词
D O I
10.1088/0954-0083/9/3/006
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
Blends of polyimides XU-218 and PEI were investigated using differential scanning calorimetry, dynamic mechanical analysis, thermogravimetric analysis and adhesive bond testing. The thermal stability of the blends increased as the proportion of PEI increased while the alpha-relaxation of the blends occurred at a slower rate and was broader and more cooperative in some blends, compared with the pure polymers. Physical aging of the pure polymers and blends in the glass state revealed changes in relaxation rate and lost enthalpy that were also consistent with blends not behaving as simple mixtures. The dynamic mechanical and physical aging behaviour was attributed to an increase in density on blending which decreased the unoccupied volume and increased the constraints on molecular mobility, as well as to the presence of concentration fluctuations. The adhesive properties of the blends were also investigated and bond strength was found to vary with blend composition and test temperature.
引用
收藏
页码:263 / 279
页数:17
相关论文
共 52 条
[1]   NONEXPONENTIAL RELAXATIONS IN STRONG AND FRAGILE GLASS FORMERS [J].
BOHMER, R ;
NGAI, KL ;
ANGELL, CA ;
PLAZEK, DJ .
JOURNAL OF CHEMICAL PHYSICS, 1993, 99 (05) :4201-4209
[2]  
Bryant RG, 1996, J APPL POLYM SCI, V59, P1249, DOI 10.1002/(SICI)1097-4628(19960222)59:8<1249::AID-APP7>3.3.CO
[3]  
2-I
[4]   Dielectric and mechanical relaxation in the blends of a polymer liquid crystal with polycarbonate [J].
Carius, HE ;
Schonhals, A ;
Guigner, D ;
Sterzynski, T ;
Brostow, W .
MACROMOLECULES, 1996, 29 (14) :5017-5025
[5]  
Chang GW, 1997, J APPL POLYM SCI, V63, P483
[6]  
Charrier J.M., 1990, POLYM MAT PROCESSING
[7]   RELAXATION PROCESSES AND MOLECULAR-MOTION IN A NEW SEMICRYSTALLINE POLYIMIDE [J].
CHENG, SZD ;
CHALMERS, TM ;
GU, Y ;
YOON, Y ;
HARRIS, FW ;
CHENG, JL ;
FONE, M ;
KOENIG, JL .
MACROMOLECULAR CHEMISTRY AND PHYSICS, 1995, 196 (05) :1439-1451
[9]   PHYSICAL AGING STUDIES IN POLYVINYL METHYL-ETHER) .1. ENTHALPY RELAXATION AS A FUNCTION OF AGING TEMPERATURE [J].
COWIE, JMG ;
FERGUSON, R .
MACROMOLECULES, 1989, 22 (05) :2307-2312
[10]   MOLECULAR MOBILITY IN PARA-SUBSTITUTED POLYARYLS .1. SUB-T(G) RELAXATION PHENOMENA IN POLY(ARYL ETHER ETHER KETONE) [J].
DAVID, L ;
ETIENNE, S .
MACROMOLECULES, 1992, 25 (17) :4302-4308