Analyses of the Phase Transitions of Bulk-Polymerized ABS via Attenuated Total Reflection-Fourier Transform Infrared Spectroscopy
The acrylonitrile-butadiene-styrene copolymer(ABS)synthesis resins produced by the bulk polymerization are environmentally friendly.However,the initiation system as well as the phase transition and grafting process in the bulk polymerization could have effects on the properties of ABS products.ABS resins were synthesized by the bulk polymerization.The effects of different contents of the initiator(azodiisobutyronitrile),chain transfer agent(tert-dodecylmercaptan),and solvent(ethylbenzene)on the kinetics processes of the bulk polymerization phase transition and the phase transition process were investigated.The structures of ABS resins during the phase transition process of the bulk polymerizations were analyzed by attenuated total reflection-Fourier transform infrared spectroscopy(ATR-FTIR)to compare their mechanical properties.The results show that the grafting behavior in the phase transition affects the polymerization rate,and the appropriate contents of initiator(a mass fraction of 0.06%),chain transfer agent(a mass fraction of 0.30%)and solvent(a mass fraction of 20%)are beneficial to the grafting process during the phase transition.During the phase transition process,the peak intensities of the styrene benzene ring and the acrylonitrile nitrile group in the grafted phase are significantly increased,which is revealed by the analysis of ATR-FTIR.Meanwhile,the ABS resin with the best overall performances were obtained.However,when the chain transfer agent content is too high,the acrylonitrile monomer in ABS would be affected.
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