Study On PA6/Core-shell Rubber/OMMT Nanocomposites

It is well known that the stiffness and toughness are two very important performance indicators for polymer application. Toughening of plastics is still a focus of polymer material science. PA6is one of plastics used widely in industry. Rubber phase can toughen PA6effectively while sacrificing the mechanical strength. So the combination of rubber phase and organoclay in to PA6can balance the toughness and stiffness.Reactive core-shell rubber particles were synthesized by grafted MA to ABS in seeded emulsion polymerization to prepared ABS-g-MA. Cationic emulsifier was used to modify the MMT. Then modified MMT was mixed with PA6to prepare PA6/MMT nanocomposite by melt blending. Then the reactive ABS-g-MA core-shell particles were introduced to the PA6/MMT nanocomposite. The main contents are as follows:1. Different core/shell ratios of ABS-g-MA are prepared by emulsion polymerization. The variation of core/shell ratios and content of organoclay affect the morphology and mechanical properties of PA6/ABS-g-MA/organoclay ternary nanocomposites. The results showed, mechanical properties are optimum when core/shell is60/40and organoclay content is3wt%.2. Ternary nanocomposites based on PA6, Maleated acrylonitrile-butadiene-styrene (ABS-g-MA) core-shell rubber particles, and modified montmorillonite (organoclay) are prepared by a twin-screw extruder with four different blending sequences. With the variation of blending sequence, the ternary nanocomposites exhibit distinct micro structure and mechanical properties. The results of mechanical testing reveal that the optimum blending sequence to achieve balanced mechanical properties is blending PA6and organoclay simultaneously and then, blending this nanocomposite with ABS-g-MA.3. Nanocomposites of PA6toughened by the maleated ethyl en e-octene bulk rubber particles (EOR-g-MA) and maleated acrylonitrile-butadiene-styrene core-shell rubber particles (ABS-g-MA) were studied. The two systems of blends containing20wt%of rubber particles grafted with1wt%MA and with3wt%organoclays. ABS-g-MA was found to promote the toughness efficiency of PA6than EOR-g-MA, which revealed on impact strength and elongation at break. Additionally, it was also observed that mechanical properties of PA6ternary or binary blends based on ABS-g-MA elastomer such as tensile strength and Young’s modulus decreased compared to PA6ternary or binary blends:based on EOR-g-MA elastomer.