TOUGHTENING MODIFICATION OF VINYL ESTER RESIN BY POLYURETHANE ACRYLATE

Abstract

Abstract: In order to improve the toughness and expand the application of vinyl ester resin, polyurethane acrylates(PUA)were synthesized by polycondensation of diphenylmethane diisocyanate (MDI), polypropylene glycol (PPG) and hydroxyethyl methacrylate, and then blended with vinyl ester resin. Modified vinyl ester resin containing polyurethane acrylate blocks was synthesized by radical copolymerization under the action of initiator. The effects of addition of different urethane acrylates on the mechanical properties of the modified resins were investigated. The results show that the urethane acrylate can effectively improve the tougheness of the vinyl ester resin. When MDI∶PPG=3∶2 and the polyurethane acrylate is added at 15%, the tensile strength is 56.3 MPa, the elongation at break is 22.5%, the notched impact strength is 2.56 kJ/m². Elongation at break and impact strength are 2.45 times and 2.29 times of the unmodified resin, respectively. The comprehensive mechanical properties are the best. The elongation at break of optical fiber reinforced core prepared by pultrusion process using modified resin as matrix resin increases by 21.5%, and the high temperature bending performance is improved.

Key words: urethane acrylate, modification, vinyl ester resin, toughness, composite

CLC Number:

TB332

BAI Guo-dong, LIU Ye, GUAN Yong, JIANG Xian-long. TOUGHTENING MODIFICATION OF VINYL ESTER RESIN BY POLYURETHANE ACRYLATE[J]. Composites Science and Engineering, 2020, 0(11): 87-92.

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