000			01788nam a2200181Ia 4500
008			220216s9999 xx 000 0 und d
100			_aYoon J R
245		0	_aEffect of bromination on the properties of ethylene-propylene-diene rubber in the presence of divinylbenzene
260			_bRubber Chemistry and Technology _c1995
300			_a824-835
520			_aThe curing behavior and vulcanizate properties of EPDM and brominated EPDM (BEPDM) were compared using a dicumyl peroxide curing system. The BEPDM displayed lower torque and crosslink density, but better tensile properties than the EPDM. In the presence of divinylbenzene (DVB) coagent, all vulcanizates, i.e, EPDM, BEPDM, and their blends with natural rubber, had improved tensile properties. At low DVB concentration, the filler effect of DVB on the modulus enhancement was noticed. At high and comparable DVB concentration, both the BEPDM and NR/BEPDM blend showed significantly higher modulus (M100) and tensile strength than their EPDM counterparts. The BEPDM was also found to have higher crosslink density and storage modulus (E) than the EPDM. This observation could be attributed to the better dispersion of DVB in the BEPDM and NR/BEPDM vulcanizates, as supported by TEM measurements. The TEM data is also consistent with the properties observed on the uncured mixes, in which the NR/BEPDM + DVB mix has favorable viscosity and die swell properties due to the more homogeneous DVB dispersion in the rubber phases. Thus, the bromination of EPDM has resulted in better processing and vulcanizate properties of the rubber and its blend with natural rubber.
650			_aBromination
650			_aEthylene-propylene diene rubber
700			_aHashim A S
700			_aIkeda Y
700			_aKhojiya S
942			_cJS
999			_c57721 _d57721