A novel strategy to construct co-continuous PLA/NBR thermoplastic vulcanizates: Metal-ligand coordination-induced dynamic vulcanization, balanced stiffness-toughness and shape memory effect
A novel strategy to construct co-continuous PLA/NBR thermoplastic vulcanizates: Metal-ligand coordination-induced dynamic vulcanization, balanced stiffness-toughness and shape memory effect
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DOI：
10.1016/j.cej.2019.123828
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发表时间：
2020-04-01
影响因子：
15.1
通讯作者：
Chen, Yukun
中科院分区：
文献类型：
--
作者：
Huang, Jiarong;Fan, Jianfeng;Chen, Yukun
在动态硫化领域，通常利用不可逆共价键来制造热塑性硫化橡胶（TPV）。在这项工作中，提出了一种新的策略，即金属配体配位诱导动态硫化，来设计具有平衡刚度-韧性和形状记忆性能的聚丙交酯（PLA）/丁二烯丙烯腈橡胶（NBR）/硫酸铜（CuSO4）TPV。在动态硫化过程中，微米级的CuSO4颗粒通过“溶解-反应-再溶解-反应”的过程转变为纳米颗粒，然后分布在连续的NBR相中。 CuSO4纳米粒子通过腈基和铜离子之间的配位相互作用使NBR交联，同时增强NBR相。这赋予 TPV 平衡的刚度-韧性特性：缺口悬臂梁冲击强度为 152.88 kJ/m(2)，拉伸强度为 22.30 MPa。此外，所制备的TPV表现出共连续形貌，具有优异的形状记忆效果，形状恢复率为92.30%。我们提出了一种同时增韧和增强PLA基形状记忆材料的新方法，它可能会扩大动态硫化的研究范围。
In the field of dynamic vulcanization, irreversible covalent bonds are utilized to fabricate thermoplastic vulcanizates (TPVs) generally. In this work, a new strategy, metal-ligand coordination-induced dynamic vulcanization, is presented to design polylactide (PLA)/butadiene acrylonitrile rubber (NBR)/cupric sulfate (CuSO4) TPVs with balanced stiffness-toughness and shape memory property. During dynamic vulcanization, the micron-sized CuSO4 particles have been transformed into nanoparticles by the process of "dissolution-reaction-redissolution-reaction" and then distributed in the continuous NBR phase. CuSO4 nanoparticles cross-link NBR through the coordination interaction between nitrile groups and copper ions, and simultaneously reinforce the NBR phase. This endows the TPVs with balanced stiffness-toughness properties: notched Izod impact strength of 152.88 kJ/m(2) and tensile strength of 22.30 MPa. Furthermore, the fabricated TPVs exhibit co-continuous morphology which resulted in excellent shape memory effect of obtaining shape recovery ratio of 92.30%. We present a novel approach to toughen and enhance PLA-based shape memory materials simultaneously, and it may expand the research scope of dynamic vulcanization.