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Synthesis and Properties of Hydroxyl-erminated Liquid Fluorosilicone Elastomer with Room-Temperature Vulcanization

Author: YuanLiBing
Tutor: ZhanXiaoLi
School: Zhejiang University
Course: Chemical Engineering
Keywords: Room temperature vulcanizing Hydroxy-endblocked Fluorosilicone rubber Liquid Rubber
CLC: TQ333.93
Type: Master's thesis
Year: 2006
Downloads: 398
Quote: 1
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Abstract


Room temperature vulcanizing hydroxyl terminated liquid fluorosilicone rubber fuel resistant sealing material is indispensable for high and low temperature for the aviation industry . Paper as a background system mixing method , the catalyst and the molecular weight regulator on polymer synthesis and performance , the improved process of the post-processing of raw rubber and successful preparation of the performance room temperature vulcanizing hydroxyl terminated liquid fluorosilicone rubber . The molecular structure of the resulting raw rubber made ??with the main physical properties as well as the raw rubber sealant application performance analysis and testing . The study shows that the mechanical agitation compared bubbling stirring method significantly improved due to increase in viscosity of the system to cause the heat transfer in the polymerization process , the materials were mixed , and the difficult problem of the migration of small molecules , the polymerization reaction smoothly and completely , easy to control , uniform distribution of polymer molecular weight . Process improvement in the use of raw rubber , a better solution is difficult to control the molecular weight of the room temperature vulcanizing hydroxyl-terminated liquid fluorosilicone rubber , the problem of degradation occurs long after the raw rubber by the selection of the catalyst to the polymerization reaction , the molecular weight adjusting agent the quality has improved significantly greater improvement curing properties and storage stability . By infrared spectroscopy , nuclear magnetic resonance, gel permeation chromatography (GPC) analysis methods , characterization of the the fluorosilicone rubber molecular structure and molecular weight and its distribution. The synthesis of room temperature vulcanizing hydroxyl terminated liquid fluorosilicone rubber formulation research and performance testing , the indicators have reached the requirements to meet the needs of the military production .

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CLC: > Industrial Technology > Chemical Industry > Rubber Industry > Synthetic rubber > Fluorine rubber, silicone rubber
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