热塑性硫化橡胶通过定制的小分子动态交联,Polymers for Advanced Technologies

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热塑性硫化橡胶通过定制的小分子动态交联
Polymers for Advanced Technologies ( IF 3.1 ) Pub Date : 2022-07-07 , DOI: 10.1002/pat.5793
Wei Liu ₁ , Jianping Ding ₁ , Yukun Chen _{1,

2}

Affiliation

具有更多特性和功能的热塑性硫化橡胶（TPV）能够找到更广泛的应用，这在我们的日常生活中越来越需要。然而，开发具有增强、回收和形状记忆等综合特性的新型 TPV 面临着巨大的挑战。在这里，我们报告了一种简单有效的途径，通过使用含有三重动态共价键的定制交联剂 (FDP) 而不是传统的交联剂 (FDP) 来制备机械坚固、可回收和形状记忆环氧化天然橡胶 (ENR)/聚乳酸 (PLA) TPV。交联剂。ENR/PLA TPVs中的ENR相演变成规则的连续相，PLA通过FDP接枝到ENR链段上。TPV 表现出经典弹性体的拉伸行为而不是塑料的拉伸行为，拉伸强度为 7。8 MPa和174%的断裂伸长率，与传统的过氧化物硫化TPV相比，分别提高了1.5倍和2.9倍。TPV中的交联ENR网络的拓扑重排可以在高温下完成。此外，其规则的相结构也赋予了TPV出色的形状记忆能力。这项工作有望为使用现成原材料开发高性能 TPV 提供新的设计思路。

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Thermoplastic vulcanizates dynamically cross-linked by a tailored small molecule

Thermoplastic vulcanizates (TPVs) with more features and functions are able to find broader applications, which is increasingly desired in our daily lives. However, great challenges were facing to develop novel TPVs with integrated properties such as reinforcement, recycling, and shape memory. Herein, we report a simple and effective route to prepare mechanically robust, recyclable and shape memory-epoxidized natural rubber (ENR)/polylactic acid (PLA) TPVs by employing a tailored cross-linker (FDP) containing triple dynamic covalent bonds instead of conventional cross-linkers. The ENR phase in ENR/PLA TPVs evolved into a regular continuous phase and PLA was grafted onto ENR chain segments through FDP. The TPVs exhibited a tensile behavior of classical elastomers rather than that of plastics, with a tensile strength of 7.8 MPa and elongation at break of 174%, increased by 1.5 times and 2.9 times, respectively as compared to the traditional TPVs vulcanized by peroxide. The topology rearrangement of the cross-linked ENR networks in the TPVs can be accomplished at high temperatures. Furthermore, its regular phase structure also bestowed an excellent shape memory ability on the TPVs. This work is promising to provide a new design idea for the development of high-performance TPVs using readily available raw materials.

更新日期：2022-07-07

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