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PVC / ASA / DOP blends structure and properties of

Author: MaXiaoLin
Tutor: ZhangMingYao
School: Changchun University of
Course: Polymer Chemistry and Physics
Keywords: PVC / ASA / DOP blends AN content Structure Performance
CLC: TQ325.3
Type: Master's thesis
Year: 2010
Downloads: 94
Quote: 0
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Abstract

Polyvinyl chloride (PVC) is a large variety of GE Plastics has a flame retardant, chemical resistance, excellent performance and a series of advantages, widely used in construction, automotive, electronics and other fields. Notch sensitivity and poor toughness of PVC with elastomer blends to improve the impact strength, in order to broaden its field of application, therefore, modified PVC resin people research hotspot. The ASA resin is a three-component two-phase polymer blends, the continuous phase for the SAN resin, a dispersed phase of polypropylene Acid Dioxide rubber particles. Butyl acrylate rubber particles as an elastomer in the blend system has a better dispersion, a large number of SAN copolymer grafted on its surface in order to improve the interfacial bonding between the PVC resin force, so that the PVC / ASA of mixed system for good overall performance. This thesis by emulsion graft copolymer of acrylonitrile and styrene prepared ASA graft emulsion technology PBA rubber particles, cohesion and dried ASA graft powder. Melt blended with polyvinyl chloride (PVC) and dioctyl phthalate (DOP), respectively, obtained PVC / ASA and PVC / ASA / DOP blends studied the mechanical properties and morphology of the Blends to give the following conclusions: (1) Synthesis of the type of AN content ASA graft copolymer, and the PVC melt blending Built a PVC / ASA blends. AN content on the structure and performance of the PVC / ASA blends. The results show that with the increase of the AN content, the impact strength of PVC / ASA's trend was first increases and then decreases when the AN content of 37%, the impact strength reaches its maximum. As the AN content increases the tensile strength and the elongation at break increases. Morphology results show that despite the change AN content, PVC / ASA are incompatible system, consistent with the results of the dynamic mechanical properties and mechanical properties. (2) on PVC / ASA / DOP blend system to examine the impact of the AN content on the dynamic mechanical properties of the blend system. The results show that, when the AN content is less than 25%, PVC / ASA / DOP Blends only one glass transition peaks. When the AN content of 25%, the blends partially compatible. Blends of two glass transition peak when the AN content is higher than 25%. (3) obtained in the two-roll mill melt blending PVC / ASA / DOP soft quality sheet heat very. The results show that, within the range of 70 to 110 ° C, as the AN content increases, the increase in the storage modulus of the blend, a soft sheet of heat quite improved. (4) With the increase of rubber content in the PVC / ASA blends, blends in rubber content of 9% brittle-ductile transition occurs, while the containing TDDM PVC / ASA blends no obvious brittle-ductile transition. Using SEM to observe the surface of a PVC / ASA blends to study the morphology of the blends, and found that, excluding the TDDM the ASA copolymer can be relatively uniformly dispersed in the PVC resin, and therefore subject to mechanical properties of the blends the impact of TDDM.

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CLC: > Industrial Technology > Chemical Industry > Synthetic resins and plastics industry > Polymer resin and plastic > PVC and plastic
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