Synthesis and Characterization of Novel Bisphenol-C-formaldehyde-acrylate-toluene Diisocyanate-PEG-400 Copolyurethanes

摘要

Bisphenol-C-formaldehyde-acrylate-TDI polyurethane and bisphenol-C-formaldehyde-acrylate-TDI-PEG-4000.001 mol(PUA-I),0.0005 mol(PUA-II),and 0.00025 mol(PUA-III)copolyurethanes have been synthesized at room temperature.The polyurethane formation is verified by Fourier transform infrared spectroscopy(FTIR).The PUA-I-III are further characterized for their thermo-mechanical and electrical properties and also their chemical resistance against water,10 each of aqueous NaCl,HC1,HNO3,H2SO4,NaOH,and KOH.Density,tensile strength,and volume resistivity increased,while electric strength decreased with decreasing concentrations of PEG-400.Copolyurethanes possess weight-gain tendency in acidic and alkaline environments and possess excellent hydrolytic stability in harsh acidic,alkaline,and saline environments.In acidic and alkaline environments,the weight-gain tendency is found to increase with decreasing PEG-400 content.The DSC transitions in conjunction with TG data confirmed multistep decomposition of copolyurethanes.The PEG-400 affected thermal stability to a considerable extent.Copolyurethanes may find applications as good insulators as well as coating materials for harsh environments.