Duck-Jei Park

Synthesis and properties of vinyltrimethoxysilane–EPDM–styrene graft terpolymer

The graft copolymerizations of vinyltrimethoxysilane (VTMO) and styrene (St) onto ethylene–propylene–diene terpolymer (EPDM) were carried out with benzoyl peroxide (BPO) as an initiator in toluene. The effects of EPDM concentration, mole ratio of VTMO to St, reaction time, reaction temperature, and initiator concentration on the graft copolymerizations were examined. The synthesized VTMO–EPDM–St graft terpolymers (VES) were confirmed by infrared and 1H-NMR spectroscopies. The molecular weight, thermal stability, light resistance, and weatherability of the graft terpolymer were investigated by gel permeation chromatography, thermogravimetric analysis, and Fade-o-Meter. The number-average molecular weight was 109,000. It was found that the heat resistance and light resistance as well as weatherability of VES are considerably better than those of acrylonitrile–butadiene–styrene terpolymer.

Synthesis and Properties of Maleic Anhydride-EPDM-Styrene Graft Terpolymer

Abstract A graft terpolymer of maleic anhydride (MAH) and styrene (St) on ethylene-propylene-diene terpolymer (EPDM) was obtained using azobisisobutyronitrile (AIBN) as an initiator in toluene. The effects of EPDM concentration, mole ratio of St to MAH, reaction time, reaction temperature, initiator concentration, and solvent on the graft copolymerizations were examined. The synthesized maleic anhydride-EPDM-styrene graft terpolymers (MAES) were identified by IR spectra. It was found that the thermal stability of the MAES was not good when compared to that of acrylonitrile-butadiene-styrene copolymer (ABS), but the light resistance and weatherability of MAES were superior to those of ABS.

Synthesis and Characterization of Acrylonitrile-EPDM-1-Vinylnaphthalene Graft Terpolymer

Abstract The graft copolymerizations of acrylonitrile (AN) and 1-vinyl-naphthalene (1-VN) onto ethylene-propylene-diene terpolymer (EPDM) were carried out with benzoyl peroxide (BPO) as an initiator in toluene. The effects of the mole ratio of 1-VN to AN, initiator concentration, reaction time, reaction temperature, and EPDM concentration on the graft copolymerizations were examined. The synthesized graft terpolymers, acrylonitrile-EPDM-1-vinylnaphthalene (AEV1), were identified by IR spectra. The thermal stability and tensile strength of AEV1 were greatly improved compared with those of ABS. The light resistance and weatherability of AEV1 were better than those of ABS when subjected to UV light for longer than 96 hours.