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Performance optimization of the elastomer toughened PVC

Author: ZuoMingLi
Tutor: ZhangHuiXuan
School: Changchun University of
Course: Polymer Chemistry and Physics
Keywords: PVC Toughening Core-shell modifier Mechanical properties
CLC: TQ325.3
Type: Master's thesis
Year: 2010
Downloads: 193
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Abstract


Polymer materials in actual use, not only need to have a high strength, but also should have high toughness, therefore its toughened research has been an important research topic of Polymer Materials Science. Polyvinyl chloride (PVC) as the most important varieties of GE Plastics one of its high mechanical strength, excellent electrical insulation properties and flame retardant properties, etc. are widely used in construction, machinery, chemical and other fields. But because PVC is a notch sensitivity material, particularly low notched impact strength, often used to alleviate these drawbacks elastomer modified agent toughened PVC concern, its in-depth study has important theoretical significance and application value . This thesis is synthesized by seed emulsion polymerization method having a core-shell structure of methyl methacrylate - butadiene - styrene copolymer (MBS) and styrene-butadiene rubber - butyl acrylate - styrene copolymer (SBR / BA / St ), and with PVC melt blending to study the mechanical properties and optical properties of the blends modifier in the PVC matrix dispersed state and blends deformation mechanism, the main contents and conclusions are as follows : To study the the MBS modifier shell graft of DVB amount of grafting efficiency, and compare shell type graft efficiency modifier toughened PVC product performance changes. The results showed that: With the increase in the amount of DVB in the MBS-shell graft procedure, the graft efficiency is gradually increased, the glass transition temperature moves to the high temperature of the rubber phase; graft rate increase is conducive to improve the MBS modifier for PVC toughening effect, MBS / PVC blends the optical properties of two phases refractive index matching degree of control. Visible by contrast with the type of core-shell ratio the MBS modifier toughened PVC product performance, as MBS modifier core-shell lower than, PVC toughening efficiency decline in optical properties of the blend, the core-shell ratio of 50/50 MBS modifiers for PVC, having the best toughening effect. The TEM observation showed that with the reduction in the core-shell ratio of the MBS modifier, the modifier can be achieved uniform dispersion in PVC; no significant deformation zone of a small particle size MBS toughened PVC hollowing-out of its deformation The mechanism of the PVC matrix shear yield. In the the MBS modifiers shell graft process, with the increase of the content of graft monomer St modifier rubber phase within the containment structure, the toughening effect of the modifier for PVC decreased. Using the method of emulsion polymerization prepared having a core-shell structure of SBR / BA / St copolymer and used for toughened PVC, results show that: BA shell modifier content increases, the impact strength modifier of the toughened product low-temperature region of the glass transition temperature is significantly increased; under TEM: With the increase in the BA content of the shell modifier, the modifier tends to be uniformly dispersed in the PVC matrix; the SBR / BA / ST modifier toughening PVC deformation mechanism of interfacial peeling of the rubber particles with the PVC substrate with the PVC matrix shear yield.

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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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