Studies on chemical interactions between chlorosulphonated polyethylene and carboxylated nitrile rubber

✍ Scribed by A. Roychoudhury; P. P. De

• Publisher: John Wiley and Sons
• Year: 1997
• Tongue: English
• Weight: 193 KB
• Volume: 63
• Category: Article
• ISSN: 0021-8995
• DOI: 10.1002/(sici)1097-4628(19970328)63:13<1761::aid-app8>3.0.co;2-e

✦ Synopsis

Highly polar rubbers interact with each other through their active functional groups via condensation or substitution reactions at high temperature. Chlorosulphonated polyethylene (CSM) rubber is a highly reactive rubber, whose reactivity is due to the {SO 2 Cl groups. When CSM reacts with carboxylated nitrile rubber (XNBR), a chemical reaction takes place between the two rubbers at high temperature. Dynamic mechanical analysis shows that CSM and XNBR form a homogeneous blend. Fourier transform infrared (FTIR) studies support that CSM/XNBR (50/50 w/w) is a thermally induced self-cross-linking blend, when cross-linking takes place through carboxylic groups of XNBR and {SO 2 Cl groups or in-situ generated allyl chloride moieties of CSM. There is a loss of some {CN groups during cross-linking; this may be due to an attack on the {CN groups by HCl (produced during heating of CSM) in the presence of inherent moisture in the polymers. Due to cross-linking, an ester or amide type of linkage is formed.