通过牺牲键和网络结构的协同作用，使PA1012 / EPDM共混物大幅度提高韧性和平衡强度,Macromolecular Materials and Engineering

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通过牺牲键和网络结构的协同作用，使PA1012 / EPDM共混物大幅度提高韧性和平衡强度
Macromolecular Materials and Engineering ( IF 4.2 ) Pub Date : 2021-03-26 , DOI: 10.1002/mame.202000813
Canchen Sun ₁ , Yuanyuan Wang ₁ , Bin Wang ₁ , Yanxia Cao ₁ , Jianfeng Wang ₁ , Yanyu Yang ₁ , Wanjie Wang ₁

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在这里，通过熔融共混制备具有不同中和水平的锌中和的乙烯丙烯二烯单体（EPDM）离聚物，然后将其与聚酰胺1012（PA1012）掺合以制造PA1012 / EPDM离聚物共混物。有趣的是，由于牺牲键（Zn 2 ⁺ -羧基，Zn ²⁺-酰胺）。形成的网络结构和牺牲性键合使PA / EPDM共混物具有大大增强的韧性（比纯PA的韧性高16倍），以及平衡的强度和刚度。同时，PA1012 / EPDM离聚物共混物的流变行为表明它们的相对较低的熔融粘度，这可以避免用橡胶增韧的塑料的加工缺陷。此外，PA1012 / EPDM离聚物共混物表现出明显的胶凝行为，并且在胶凝点处表现出最大的缺口悬臂梁式冲击强度，其中可以明显观察到独特的双网状结构，表明流变学和力学参数之间存在相应的相关性。此外，还探索了PA1012 / EPDM离聚物共混物在凝胶点的超增韧机理，这源于橡胶颗粒的大变形和空化以及特殊的双网状形态的破坏。这项研究提供了一种新颖而有效的策略来同时制造具有出色韧性和优异强度的PA材料。

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Toward Largely Enhanced Toughness and Balanced Strength in PA1012/EPDM Blends via Synergistic Effect of Sacrificial Bonds and Network Structure

Here, zinc‐neutralized ethylene propylene diene monomer (EPDM) ionomers with different neutralization levels are prepared through melt blending, and are then incorporated with polyamide 1012 (PA1012) to fabricate PA1012/EPDM ionomer blends. Interestingly, complex crosslinking networks are formed in the blends due to the construction of sacrificial bonds (Zn²⁺‐carboxyl, Zn²⁺‐amide). The as‐formed network structure and sacrificial bond endow the PA/EPDM blends with largely enhanced toughness (16 times higher than that of neat PA), as well as balanced strength and stiffness. Meanwhile, the rheological behaviors of PA1012/EPDM ionomer blends indicate their relative low melting viscosity, which can avoid the processing shortcomings of plastics toughened with rubber. Moreover, PA1012/EPDM ionomer blends show obvious gelation behavior, and a maximum notched Izod impact strength exhibited at the gel point, in which unique double network structure can be observed obviously, indicating that there is a corresponding correlation between the rheological and mechanical parameters. Furthermore, the supper‐toughening mechanism of PA1012/EPDM ionomer blends at gel point is explored, which origins from the large deformation and cavitation of rubber particles and the destruction of special double network morphologies. This study provides a novel and effective strategy to fabricate PA materials with outstanding toughness and excellent strength simultaneously.

更新日期：2021-05-17

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