1993 Volume 50 Issue 1 Pages 57-63
The curing mechanism of a maleimide-styryl (MS) resin, which was prepared by the reaction of poly (bromo-4-vinyl phenyl methacrylate) (PVPM), 2, 2-bis [4- (4-maleimide phenoxy) phenyl ] propane (BBMI), and epoxy-modified polybutadiene (EPB), was investigated by differential scanning calorimetry (DSC). The curing reaction of the MS resin with 2, 5-dimethy1-2, 5-di (t-butyl peroxy) -3-hexine (25B) and benzoguanamine (BG) as hardeners was found to take place by radical polymerization of the double bonds in PVPM, BBMI, and EPB with 25B at about 140°C to 170°C followed by addition of the amino group of BG to the maleimide group of BBMI and the epoxy group of EPB at 210°C This curing reaction proceeded at lower temperature with dicyanodiamide (Dicy) instead of BG as a hardener. Addition reaction of Dicy to BBMI and EPB was completed below 190°C.
