Structure and mechanical properties of nitrile rubbers modified with iodine

✍ Scribed by Dariusz M. Bieliński; Ludomir Ślusarski; Andrzej Włochowicz; Czeław Ślusarczyk

• Publisher: John Wiley and Sons
• Year: 1998
• Tongue: English
• Weight: 378 KB
• Volume: 67
• Category: Article
• ISSN: 0021-8995
• DOI: 10.1002/(sici)1097-4628(19980118)67:3<501::aid-app13>3.0.co;2-y

✦ Synopsis

Nitrile rubbers, both common and hydrogenated, revealed some kind of ordering, as detected by WAXS. Strain-induced crystallization is responsible for the enhanced degree of crystallinity for HNBR. In the case of NBR, another mechanism has been proposed, namely specific interactions between carbon-carbon double bonds from butadiene and cyano groups from acrylonitrile monomer units, leading to an EDA complex formation. Iodination reduces the degree of crystallinity of both materials; however, their stiffness increases as the result of modification, probably due to dipoledipole interactions or hindering effects accompanying introduction of ''large'' iodine atoms into the macromolecular structure.