Abstract: The gelation and rheological property of chlorinated poly(vinyl chloride)/methyl methacrylate-butadiene-styrene copolymer (CPVC/MBS) blends were studied using differential scanning calorimetry and HAAKE rheometer. The mechanical properties, thermal properties and microscopic structure of the blends were also investigated. It was found that MBS could effectively improved processing performance of CPVC as it promoted the plastication and the gelation degree of CPVC. During the mixing of CPVC and MBS in the HAAKE rheometer, the equilibrium torque and temperature greatly increased while plasticizing time reduced. When the dosage of MBS was 6 phr, the blend displayed the optimal comprehensive properties.

Key words: chlorinated poly(vinyl chloride), methyl methacrylate-butadiene-styrene copolymer, gelation degree, rheological behavior, mechanical property