|
Chlorinated polyvinyl chloride having a high heat resistance, high glass transition temperature, high heat deflection temperature, good fire resistance and smoke suppression, the unique chemical stability is an important engineering materials. However, due to the poor impact resistance of the chlorinated polyvinyl chloride, poor processing performance, limiting its good application. Acrylonitrile - butadiene - styrene copolymer (ABS) is the most commonly used core-shell impact modifier, its nuclear PB rubber particles, the shell of a SAN graft copolymer toughening particles of core-shell structure can be improved to the nuclear interface binding force between the substrate, it is blended with CPVC significantly improve its impact strength and heat distortion temperature. CPVC / ABS blends structure, performance, compatibility reports less. The work from the relationship between the mechanical properties and morphology, and dynamic mechanical properties, compatibility aspects of CPVC / ABS blends. 1. Different AN content of CPVC / ABS mechanical properties and morphology, CPVC / SAN blends model to study the impact of the AN content compatibility. AN content of the blend compatibility of DMA, and SEM conclusion is consistent. For setting the rubber content of the blend of 15wt% of different core-shell ratio (40/60, 70/30) of CPVC / ABS blend, An content on the impact properties of the CPVC / ABS blend impact different. For the core-shell ratio of 40/60 ABS effect toughening of the CPVC significantly better than the core-shell ratio of 70/30 ABS. This can be explained from blends deformation mechanism. 2. ABS CPVC / ABS blends mechanical properties, morphology, and dynamic mechanical properties of different core-shell ratio. The results showed that, with the core-shell ratio increases CPVC / ABS blends impact performance was first increases and then decreases. When the ABS core-shell ratio of 40/60 reaches the maximum value, while the tensile strength gradually increases. SEM results show that for the core-shell ratio of 30/70 ABS blend was in a phase separation. The dynamic mechanical analysis showed that, with the core-shell ratio increases, CPVC and SAN phase glass transition peak part of the stack. For the core-shell ratio of 30/70 ABS copolymers, SAN blends below the the CPVC glass transition temperature viscous flow occurs due to heat resistance difference of CPVC and SAN. Because of the high value of tanδ of the SAN, the glass transition peak and CVPC glass transition peaks are superposed on each other, one glass transition peak, and the blend is immiscible. 3. Molecular weight regulator TDDM (tert-dodecyl mercaptan) content CPVC / ABS blends mechanical properties, morphology, dynamic mechanical properties. The results show that: the trend with TDDM content increases, the impact properties of the blends was increased and then decreased. While the tensile strength, elongation at break decreases. The results showed that: for the study of the dynamic mechanical properties, the TDDM content increased, help to enhance the melt mixing of the blend. SEM results of TDDM content of the rubber particles dispersed. Other hand, the impact performance of the blend showed a melt miscibility is not the only condition to enhance toughening efficiency.
|