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CR composites with improved processing safety crosslinked via Heck's reaction
Author(s) -
Dziemidkiewicz Anna,
Maciejewska Magdalena
Publication year - 2021
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.49922
Subject(s) - triethanolamine , benzothiazole , vulcanization , curing (chemistry) , natural rubber , ultimate tensile strength , chloroprene , chemistry , polymer chemistry , materials science , elongation , nuclear chemistry , composite material , organic chemistry , analytical chemistry (journal)
Abstract The aim of this study was to optimize the composition of the chloroprene rubber (CR) composites crosslinked via the Heck‐type reaction to ensure their safe processing at elevated temperature. The developed curing system consisting of iron (III) acetylacetonate (Fe(acac)) and triethanolamine (TEOA) demonstrates high activity and more eco‐friendly composition in comparison with metal oxide system, commercially used for CR crosslinking. However, the high activity of Fe(acac)/TEOA system results in a short scorch time, which is the greatest disadvantage regarding the safe processing of CR rubber and thus, must be improved. Therefore, CR compounds with Fe(acac) in the presence of different additives were studied. The longest scorch times (t 02 ) were observed for rubber compounds with urotropine (U), N‐cyclohexyl‐2‐benzothiazole sulfenamide (CBS) or salicylic acid. Moreover, vulcanizates containing these additives exhibited higher tensile strengths and elongation at breaks compared to CR crosslinked with Fe(acac)/TEOA system.