IMPROVING THE PROPERTIES OF A POLY (ACRYLONITRILE-CO-BUTADIENE)/NATURAL RUBBER BLEND BY INTRODUCING INTERFACIAL CROSSLINKS USING BISMALEIMIDE DURING THE INITIAL PHASE OF ACCELERATED SULFUR CURING

IF 1.2 4区工程技术 Q4 POLYMER SCIENCE

Rubber Chemistry and Technology Pub Date : 2023-09-29 DOI:10.5254/rct-23.948326

Marek Pöschl, Shibulal G. Sathi, Radek Stoček

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引用次数: 0

Abstract

ABSTRACT To develop a technologically compatible blend of natural rubber (NR) and acrylonitrile-co-butadiene rubber (NBR) is always a challenge due to their polarity mismatch. As a result, the physico-mechanical properties of their blends will be generally poor. To address this issue, an attempt was made to increase the uniform distribution of crosslinks across the blend phases at the time of molding at 170 °C. A cure composition consisting of sulfur (S) and a delayed-action accelerator (N-cyclohexyl-2-benzothiazole sulfenamide: CBS) has been designed to co-crosslink both phases of the blend simultaneously. The tensile properties, particularly the tensile strength (TS) of the blend cured by this method were superior (approximately 371% greater) than the TS of the blend cured using a combination of S/CBS and an ultrafast accelerator (Tetramethylthiuram disulfide, TMTD). A bifunctional maleimide (Maleide F) was also employed in conjunction with S/CBS in the curing recipe to further improve the distribution of sulfidic crosslinks by reducing the interfacial tension between the NR and NBR phases via Alder-ene reaction.

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通过在硫加速硫化初期引入双马来酰亚胺的界面交联，改善了聚丙烯腈-共丁二烯/天然橡胶共混物的性能

由于天然橡胶(NR)和丙烯腈-共丁二烯橡胶(NBR)的极性不匹配，开发一种技术相容的共混物一直是一个挑战。因此，其共混物的物理机械性能通常较差。为了解决这个问题，尝试在170°C成型时增加跨共混相交联的均匀分布。设计了一种由硫(S)和延迟作用促进剂(n -环己基-2-苯并噻唑磺胺:CBS)组成的固化组合物，以同时共交联共混物的两相。该方法固化的共混物的拉伸性能，特别是拉伸强度(TS)比使用S/CBS和超快促进剂(四甲基硫脲，TMTD)的组合固化的共混物的TS优越(约371%)。双官能团马来酰亚胺(Maleide F)与S/CBS一起用于硫化配方，通过醛烯反应降低NR和NBR相之间的界面张力，进一步改善硫化交联的分布。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Rubber Chemistry and Technology 工程技术-高分子科学

CiteScore

3.50

自引率

20.00%

发文量

审稿时长

3.6 months

期刊介绍： The scope of RC&T covers: -Chemistry and Properties- Mechanics- Materials Science- Nanocomposites- Biotechnology- Rubber Recycling- Green Technology- Characterization and Simulation. Published continuously since 1928, the journal provides the deepest archive of published research in the field. Rubber Chemistry & Technology is read by scientists and engineers in academia, industry and government.