Title: LIQUID SILICONE RUBBER VULCANIZATES: NETWORK STRUCTURE – PROPERTY RELATIONSHIP AND CURE KINETICS
Page Range: p.477-488
Author(s): Rajesh G; Maji P K; Mithun Bhattacharya; Anusuya Choudhury; Nabarun Roy; Anubhav Saxena; Bhowmick A K
File size: 709K
Download the pdf (subscribers only)
Buy the pdf (non-subscribers)
Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 18
Issue No: No.9
Abstract
Liquid silicone rubber (LSR) vulcanisates have been prepared from vinyl-end capped polydimethylsiloxane (PDMS) and polymethylhydrogenosiloxane (PMHS) in presence of platinum catalyst using solution casting technique. The science involving synthesis of usable silicone rubber by curing with polymethylhydrogenosiloxane has been studied in details. The effects of vinyl content of PDMS and the ratio of hydride crosslinker to vinyl concentration on crosslink density, mechanical, dynamic-mechanical and thermal properties have been discussed. It has been found that at optimum level of crosslinker, the LSR vulcanisate shows a maximum crosslink density with highest improvement in mechanical and thermal properties. The amount of crosslinker required, depends upon the number of vinyl functionality per unit length of the polymer chain and the chemical composition of the hydride crosslinker. This study makes a novel attempt to determine cure kinetics of PDMS by using Fourier Transform Infrared spectroscopy. Measurements have been done at three different temperatures and found to follow the first order reaction with respect to consumption of vinyl (C=C) and silyl hydride groups (Si-H). The activation energy and kinetic parameters have been determined as well. 48 Refs.
Related reading
More journal reading and science coverage connected to this topic.
A study of cutting temperatures in turning carbon-fiber-reinforced-plastic (CRFP) composites with nose radius worn tools
Title: A study of cutting temperatures in turning carbon-fiber-reinforced-plastic (CRFP) composites with nose radius worn tools Page Range: p.19-26 Author(s): Chung-Shin Chang File size:…
Curing residual strain monitoring of carbon fiber reinforced polymer composite using notched long-period fiber grating
Title: Curing residual strain monitoring of carbon fiber reinforced polymer composite using notched long-period fiber grating Page Range: p.27-34 Author(s): Ke-Ping Ma; Chao-Wei Wu;…
Mechanical properties of glass bead-modified polymer composite
Title: Mechanical properties of glass bead-modified polymer composite Page Range: p.35-44 Author(s): Tsung-Han Hsieh; Ming-Yuan Shen; Yau-Shian Huang; Qi-Qian He; Hsuan-Chih Chen File size:…