Some physicochemical properties of blends of epoxidized poly(buladiene-block-styrene) (EBS)
and poly(vinyl chloride) (PVC)
The process of dehydrohalogcnation at 180°C of EBS/PVC blends in dependence on the composition of the blend (0—50 mass-% of EBS) and on the cpoxidation degree of EBS copolymer (content of epoxide groups in the range of 0—49 mole-%) was investigated. The higher is the ratio of epoxide groups (EB) to vinyl chloride (VC) mers (the ЕВ/VC ratio was changed in the range of 0—0.184), the longer is the induction period (t0) and the lower is the amount of hydrogen chloride liberated from the system. The epoxidized EBS copolymer is an efficient thermal stabilizer of PVC and its action in compositions with PVC can be enhanced in a synergetic manner by addition of organometallic stabilizers. The effect of the cpoxidation degree of EBS copolymer on the charakter of flow curves at 200°C and on the tensile properties of samples of EBS-PVC blends was also investigated.
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