Facile Construction of Zn2+-Carboxyl Salt-Bonding as Sacrificial Unit in EPDM Rubber toward Mechanical and Sealing Resilience Performance Enhancement,Macromolecular Materials and Engineering

当前位置： X-MOL 学术 › Macromol. Mater. Eng. › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

Facile Construction of Zn2+-Carboxyl Salt-Bonding as Sacrificial Unit in EPDM Rubber toward Mechanical and Sealing Resilience Performance Enhancement
Macromolecular Materials and Engineering ( IF 4.2 ) Pub Date : 2021-06-12 , DOI: 10.1002/mame.202100184
Chengjie Li ₁ , Zun Yuan ₂ , Lin Ye ₂

Affiliation

In view of the facile reaction between carboxyl groups and zinc oxide (ZnO), Zn²⁺-carboxyl salt-bonding is constructed in ethylene propylene diene monomer (EPDM) rubber system by grafting reaction of glutamic acid (Glu), serving as sacrificial unit endowed EPDM-g-Glu/ZnO sample with excellent reprocessing and recycling ability. Through reaction of ZnO/methacrylic acid (MAA), EPDM-g-Glu/zinc dimethacrylate (ZDMA) composite is further prepared by in situ formation of ZDMA, and ZDMA is rapidly polymerized to form poly-ZDMA (PZDMA) containing massive Zn²⁺-carboxyl ion pairs once vulcanized, which exhibits fuzzy interface with the matrix. Relative to EPDM/ZDMA, the higher polymerization degree of ZDMA is achieved with the reduction of the size of PZDMA clusters, demonstrating the improvement of interfacial bonding, which results in the formation of a developed crosslinking network structure for EPDM-g-Glu/ZDMA. The mechanical strength, fracture toughness, and hysteresis loss of EPDM-g-Glu/ZDMA-40% show a significant increase in comparison with EPDM/CB-40% and EPDM/ZDMA-40%, meanwhile the relatively lower compression set and slower contact stress relaxation are achieved by energy dissipation mechanism of preferential rupture of Zn²⁺-carboxyl salt-bonding before breakage of covalent bonds during compression aging process, revealing the effective enhancement of durable sealing resilience performance.

更新日期：2021-08-17

点击分享查看原文

点击收藏

阅读更多本刊最新论文本刊介绍/投稿指南11