INFLUENCE OF MOLECULAR STRUCTURE ON MELT VISCOSITY AND FEATURES OF POLYIMIDE FOAM

Fiber Reinforced Plastics/Composites ›› 2017, Vol. 0 ›› Issue (1): 36-43.

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INFLUENCE OF MOLECULAR STRUCTURE ON MELT VISCOSITY AND FEATURES OF POLYIMIDE FOAM

HU Ai-Jun¹ , LI Ke-di², LI Shu-shu¹ , YANG Shi-yong¹

1.Institute of Chemistry, The Chinese Academy of Sciences, Beijing 100190, China;
2.Cashem Advanced Materials Hi-tech Co., Ltd., Shaoxing 312369, China

Received:2016-05-10 Online:2017-01-28 Published:2017-01-28

Abstract

Abstract: In a 2,3,3',4'-biphenyltetracarboxylic dianhydride (a-BPDA) polyimide (PI) foam system, we studied the influence of thermal treatment temperature, calculated molecular weight and dianhydride molecular structure on the melt viscosity of precursor resin and the features of foam. We found that in a-BPDA/m-PDA/NA system, we were able to make uniform foam with outstanding features when precursor resin calculated molecular weight is 1500 g/mole, foam density is 100 kg/m³ and thermal treatment is 260 ℃/1 hr. The foam has 89% closed-cell content, 1.34 MPa compression strength and 37.1 MPa compression modulus. Partially introducing ODPA or BTDA into this PI foam system can reduce the cost, and maintain those good features and closed-cell content of the foam.

Key words: polyimide foam, high temperature resistance, melt viscosity, closed-cell

CLC Number:

TB332

HU Ai-Jun , LI Ke-di, LI Shu-shu , YANG Shi-yong. INFLUENCE OF MOLECULAR STRUCTURE ON MELT VISCOSITY AND FEATURES OF POLYIMIDE FOAM[J]. Fiber Reinforced Plastics/Composites, 2017, 0(1): 36-43.

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INFLUENCE OF MOLECULAR STRUCTURE ON MELT VISCOSITY AND FEATURES OF POLYIMIDE FOAM

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