The Study Of Structures And Propercies Of CPVC/ABS Blends

Chlorinated polyvinyl chloride (CPVC) is product of polyvinyl chloride (PVC) via chlorination reaction. Glass transition temperature (Tg) and Thermal deformation temperature is higher than PVC, because there are more chlorine atom in CPVC. The polarity between the molecular chain and the Molecular force is enhanced, cause the impact strength is poor, and difficulties in processing. Those factors limited the use of CPVC. The best way to toughen CPVC is introducing core-shell modifiers. In this work, ABS, MBS was been synthesized by emulsion polymerization, and melt with CPVC, and the main works and the results as following:1. The effect of core-shell ratio of ABS on mechanical and structure properties of CPVC/ABS blends were studied. Dynamic mechanical analysis showed that the tanδ peak of SAN rich-phase partly overlapped with CPVC rich-phase as the increase of the core-shell ratio of ABS. As for30/70core-shell ratio of ABS, the SAN became viscous below the glass transition temperature of CPVC. Although there was just one glass transition temperature, the blend was immiscibility. SEM showed that the blends of CPVC/ABS30-70were incompatibility apparently. The results showed that the impact strength of the blends expressed first increase and then decrease with the increase of the core-shell ratio of ABS. When the PB particle size was340nm and the core-shell ratio was40/60, the blend showed a max value. When the PB particle size was100nm and core-shell ratio was60/40, the blend showed a max value.2. The effect of AN content on mechanical and structure properties of CPVC/ABS blends were studied.Dynamic mechanical analysis results of CPVC/SAN were the same with the morphological properties of CPVC/ABS. The sheel of the ABS is immiscible with CPVC resin. But when the AN content was set to20wt%-25wt%, the interaction between SAN and CPVC is strong. The mechanical properties of CPVC/ABS blends in which the PB content was set to15wt%were studied. With the change of AN content, the impact strength followed different way for CPVC/ABS blends with different core-shell ratios of ABS due to the influence of the compatibility. When the core-shell ratio was40/60, the CPVC/ABS blends were much ductile in more widely AN range than the blends which the core-shell ratio of ABS was60/40.3. The effects of particle size, core-shell ratio, MMA content on ABS and the PB content in blends in the CPVC/MBS and CPVC-PVC/MBS blends were investigated. The results showed that the impact strength of the blends expressed first increase and then decrease with the increase of particle size and the core-shell ratio of ABS.When the PB particle size was 100nm and the core-shell ratio was50/50, the blend showed a max value. The impact strength of CPVC/ABS blends was increasing with the increasing of MMA content. The impact strength of the blends expressed first increase and then decrease with the increase of PB content of the blend. There is no brittle-ductile transition point. When the PB content was15%, the blend showed a max value. The impact strength was297.6J/m. The Solubility of the shell of MBS is similar with the PVC resin, therefore the properties of CPVC/PVC/MBS blends were more excellent then CPVC/MBS blends.