Novel thermoplastic elastomers from fluorocarbon elastomer, acrylate rubber and acrylate plastics

摘要

Novel thermoplastic elastomers developed from binary and ternary blends of acrylate rubber (ACM), fluorocarbon rubber (FKM) and multifunctional acrylates were studied using infrared (IR) spectroscopy, dynamic mechanical thermal analysis (DMTA), transmission electron microscopy (TEM), and mechanical testing. The IR study showed the presence of interaction between the constituents of binary and ternary blends with broadening, merging and shifting of characteristic bands corresponding to carbonyl group of ACM and acrylate at 1730 cm{sup}1. The decrease in absorbance of the double bond peak of the acrylate monomer at 1630 cm{sup}(-1) was also observed due to the polymerization of acrylate monomers. Among various multifunctional acrylates used in this study, trimethylol propane triacrylate (TMPTA) showed optimum improvement in the mechanical properties of ACM/FKM blends before and after thermal aging. The best mechanical properties were obtained with 50/50/30 (w/w) ACM/FKM/TMPTA. The swelling study of these blends in various solvents with solubility parameters ranging from 8 to 25 (cal/cm{sup}3){sup}(1/2) recorded improvement in swelling resistance. The dynamic mechanical thermal analysis indicated the presence of a single glass-transition temperature (T{sub}g) with respect to ACM/FKM blends with a minor transition for the acrylate phase. The storage modulus (E') of the ternary blends was higher than that of the ACM/FKM binary blend at all measured temperatures.