Energy-efficient frontal polymerization of poly(DCPD-co-TCPD) with improving thermomechanical properties and chemical resistance

Abstract

Polydicyclopentadiene (PDCPD) was attractive in marine, automotive and new energy fields, but limited by its lower rigidity. Herein, poly(dicyclopentadiene-co-tricyclopentadiene) (poly(DCPD-co-TCPD)), was prepared by rapid and energy-efficient frontal polymerization (FP). The flexural properties of copolymers prepared via FP were comparable to those prepared by long-term oven curing. Furthermore, the study explored the cis-trans isomerization of double bond, molecular weight between cross-links, density, swelling degree and monomer conversion to systematically analyze the influence of tricyclopentadiene (TCPD) incorporation. Notably, the selected comonomer TCPD was relatively simple in synthesis, and its incorporation resulted in remarkable enhancement of the thermomechanical properties and acid-base resistance of neat PDCPD. At an 80 wt% TCPD incorporation, the flexural modulus increased significantly from 1865 MPa to 2703 MPa, and the Tg elevated from 147 ℃ to 210 ℃. Compared to other widely used thermosets, poly(DCPD-co-TCPD) exhibited significant advantages in terms of being lightweight and heat-resistant. The resulting thermosets demonstrated considerable potential for applications as high-performance thermosets and in composites with adjustable thermomechanical properties.