CR composites with improved processing safety crosslinked via Heck's reaction,Journal of Applied Polymer Science

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CR composites with improved processing safety crosslinked via Heck's reaction
Journal of Applied Polymer Science ( IF 2.7 ) Pub Date : 2020-09-17 , DOI: 10.1002/app.49922
Anna Dziemidkiewicz ₁ , Magdalena Maciejewska ₁

Affiliation

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 (t₀₂) 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.

中文翻译：

通过Heck反应使加工安全性得到改善的CR复合材料

这项研究的目的是优化通过Heck型反应交联的氯丁橡胶（CR）复合材料的组成，以确保其在高温下的安全加工。与商业上用于CR交联的金属氧化物体系相比，由乙酰丙酮铁（III）（Fe（acac））和三乙醇胺（TEOA）组成的已开发的固化体系具有更高的活性和更环保的组成。但是，Fe（acac）/ TEOA体系的高活性导致焦烧时间短，这是安全加工CR橡胶的最大缺点，因此必须加以改进。因此，研究了在不同添加剂存在下含Fe（acac）的CR化合物。最长烧焦时间（t ₀₂）观察到了具有乌托品（U），N-环己基-2-苯并噻唑亚磺酰胺（CBS）或水杨酸的橡胶化合物此外，与用Fe（acac）/ TEOA系统交联的CR相比，含有这些添加剂的硫化橡胶表现出更高的拉伸强度和断裂伸长率。

更新日期：2020-11-25

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