The Effect of Crosslinking Density on Dynamic Mechanical Properties of Polyurethane/Polystyrene Interpenetrating Polymer Networks

Chem. J. Chinese Universities ›› 1995, Vol. 16 ›› Issue (4): 653.

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The Effect of Crosslinking Density on Dynamic Mechanical Properties of Polyurethane/Polystyrene Interpenetrating Polymer Networks

HAN Qing-Guo, WANG Jing-Yuan, LIU Rui-Ying, LI Yu-Wei, TANG Xin-Yi

Department of Chemistry, Jilin University, Changchun, 130023

Received:1994-04-05 Revised:1994-10-23 Online:1995-04-24 Published:1995-04-24

Abstract

Abstract: In this paper polyurethane/polystyrene IPNs was synthesized by simultaneous synthesis method.The effects of crosslinking density of one and two netWorks on the dy namic mechanical properties were reported by variation of NCO/OH ratio,30H/2OHratio,the types of isocyanate,the molecular weight of polyethyl-glycol,(2-hydroxyethyl methacrylate and divinyl benzene,The results show that increasing crosslinking density and interpenetrating entanglement introduce"forced compatihility", so that it accelerates curing rate and decreases the phase separation. When the network curing rate is so fast,the compatibility of IPNs decrease for the incompatibility IPNs. One of the important factors of controlling IPNs phase separation is that the two networks cure simultaneously.

Key words: Interpenetrating polymer networks(IPN), Polyurethane, Polystyrene, Dynamic mechnical properties

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HAN Qing-Guo, WANG Jing-Yuan, LIU Rui-Ying, LI Yu-Wei, TANG Xin-Yi . The Effect of Crosslinking Density on Dynamic Mechanical Properties of Polyurethane/Polystyrene Interpenetrating Polymer Networks[J]. Chem. J. Chinese Universities, 1995, 16(4): 653.

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The Effect of Crosslinking Density on Dynamic Mechanical Properties of Polyurethane/Polystyrene Interpenetrating Polymer Networks

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