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Design of Epoxy-Functionalized Styrene-Butadiene Rubber with Bio-Based Dicarboxylic Acid as a Cross-Linker toward the Green-Curing Process and Recyclability
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2020-04-30 , DOI: 10.1021/acs.iecr.0c00481 Ganggang Zhang 1 , Kuan Liang 1 , Haoran Feng 1 , Jianxun Pang 2 , Naiqing Liu 2 , Xiaolin Li 1 , Xinxin Zhou 1 , Runguo Wang 1 , Liqun Zhang 1
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2020-04-30 , DOI: 10.1021/acs.iecr.0c00481 Ganggang Zhang 1 , Kuan Liang 1 , Haoran Feng 1 , Jianxun Pang 2 , Naiqing Liu 2 , Xiaolin Li 1 , Xinxin Zhou 1 , Runguo Wang 1 , Liqun Zhang 1
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The covalently curing process for rubbers is indispensable in the rubber industry; however, there have been several inherent issues caused by traditional curing methods, such as the utilization of toxic curing additives, release of volatile organic compounds (VOCs), and difficulties in the recycling of end-of-life rubbers. In this work, a simple and effective curing strategy for epoxy-functionalized rubbers was provided to obtain a green-curing process, excellent mechanical properties, and good recyclability. The epoxy-functionalized styrene-butadiene rubbers (SBR-GMA) with different epoxy group contents were synthesized by introducing glycidyl methacrylate (GMA) during emulsion polymerization. This work highlights a green-curing strategy in which bio-based dicarboxylic acid serves as a cross-linker to cross-link epoxy-functionalized rubbers without additional additives. By the reaction between the epoxy groups in SBR-GMA rubber chains and carboxyl groups of dicarboxylic acid, the covalently cross-linking network-containing ester linkages are formed. Because the epoxy groups in SBR-GMA chains have high reactivity, the SBR-GMA with a small amount of dicarboxylic acid as a cross-linker can achieve an excellent cross-linking efficiency and rate. Additionally, the cross-linked rubber exhibits excellent mechanical properties, which could be widely regulated by changing the type and content of dicarboxylic acids. Moreover, due to the incorporation of ester linkages into the cross-linking network structure, we provide a facile and cost-effective chemical methodology for the recovery of end-of-life rubbers by the selective cleavage of the ester linkages. We envision that the epoxy-functionalized rubber may be a promising base material for the green-curing strategy, which could be interesting candidates for technical applications.
中文翻译：
以生物基二羧酸为交联剂的环氧官能化丁苯橡胶的绿色固化工艺和可回收性设计
橡胶的共价固化过程在橡胶工业中是必不可少的。但是，传统的固化方法存在一些固有的问题，例如，使用有毒的固化添加剂，释放挥发性有机化合物（VOC），以及回收报废橡胶的困难。在这项工作中，提供了一种简单有效的环氧官能化橡胶硫化策略，以获得绿色硫化工艺，优异的机械性能和良好的可回收性。通过在乳液聚合过程中引入甲基丙烯酸缩水甘油酯（GMA），合成了具有不同环氧基含量的环氧官能化丁苯橡胶（SBR-GMA）。这项工作强调了一种绿色固化策略，其中生物基二羧酸充当交联剂，无需额外的添加剂即可交联环氧官能化橡胶。通过SBR-GMA橡胶链中的环氧基与二羧酸的羧基之间的反应，形成了含共价交联网络的酯键。因为SBR-GMA链中的环氧基具有高反应活性，所以以少量二羧酸作为交联剂的SBR-GMA可以实现出色的交联效率和速率。另外，交联橡胶表现出优异的机械性能，这可以通过改变二羧酸的类型和含量来广泛地调节。此外，由于将酯键结合到交联网络结构中，我们提供了一种通过选择性裂解酯键来回收报废橡胶的简便且经济高效的化学方法。我们设想，环氧官能化的橡胶可能是绿色固化策略的有前途的基础材料，这可能是技术应用的有趣候选对象。
更新日期：2020-04-30
中文翻译：
以生物基二羧酸为交联剂的环氧官能化丁苯橡胶的绿色固化工艺和可回收性设计
橡胶的共价固化过程在橡胶工业中是必不可少的。但是，传统的固化方法存在一些固有的问题，例如，使用有毒的固化添加剂，释放挥发性有机化合物（VOC），以及回收报废橡胶的困难。在这项工作中，提供了一种简单有效的环氧官能化橡胶硫化策略，以获得绿色硫化工艺，优异的机械性能和良好的可回收性。通过在乳液聚合过程中引入甲基丙烯酸缩水甘油酯（GMA），合成了具有不同环氧基含量的环氧官能化丁苯橡胶（SBR-GMA）。这项工作强调了一种绿色固化策略，其中生物基二羧酸充当交联剂，无需额外的添加剂即可交联环氧官能化橡胶。通过SBR-GMA橡胶链中的环氧基与二羧酸的羧基之间的反应，形成了含共价交联网络的酯键。因为SBR-GMA链中的环氧基具有高反应活性，所以以少量二羧酸作为交联剂的SBR-GMA可以实现出色的交联效率和速率。另外，交联橡胶表现出优异的机械性能，这可以通过改变二羧酸的类型和含量来广泛地调节。此外，由于将酯键结合到交联网络结构中，我们提供了一种通过选择性裂解酯键来回收报废橡胶的简便且经济高效的化学方法。我们设想，环氧官能化的橡胶可能是绿色固化策略的有前途的基础材料，这可能是技术应用的有趣候选对象。
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