Abstract It is a challenge to achieve considerable shape-memory (SM) effect for typical sea-island structured polymer blends. In this paper, we successfully realized the SM behavior for classical ethylene-propylene-diene rubber/polypropylene (EPDM/PP) thermoplastic vulcanizates (TPVs) through a strong rubber/plastic interface compatibilized by in-situ formed zinc dimethacrylate (ZDMA) which came from methacrylic acid (MAA) and excess zinc oxide (ZnO) nanoparticles. With MAA/ZnO, the average size of EPDM particles reduced to 400–500 nm, which significantly enlarged EPDM/PP interfacial contact surfaces. The enhanced interface improved the efficiency of stress delivery between PP and EPDM phases, which was critical to fulfill the SM behavior. At the same time, residual ZnO nanoparticles stressed a reinforcement on EPDM phase and PP phase, which further improved the shape recovery (SR) and shape fixing (SF) of TPVs. Enhanced tensile strength (∼9.1 MPa) and Young’ modulus (∼380 MPa), improved SF (∼99%) and SR (∼98%) of TPVs were achieved by tailoring the content of residual ZnO nanoparticles (MAA/ZnO = 2:1.3) and the shape deformation temperature (120 °C).

中文翻译：

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通过甲基丙烯酸和过量氧化锌纳米粒子的原位增容设计基于海岛结构的EPDM/PP TPV的形状记忆材料

摘要 对于典型的海岛结构聚合物共混物，要实现可观的形状记忆（SM）效果是一项挑战。在本文中，我们通过原位形成的二甲基丙烯酸锌 (ZDMA) 增容的强橡胶/塑料界面，成功实现了经典三元乙丙橡胶/聚丙烯 (EPDM/PP) 热塑性硫化橡胶 (TPV) 的 SM 行为。来自甲基丙烯酸 (MAA) 和过量的氧化锌 (ZnO) 纳米颗粒。使用 MAA/ZnO，EPDM 颗粒的平均尺寸减小到 400-500 nm，这显着扩大了 EPDM/PP 界面接触面。增强的界面提高了 PP 和 EPDM 相之间的应力传递效率，这对于实现 SM 行为至关重要。同时，残留的 ZnO 纳米颗粒对 EPDM 相和 PP 相施加了增强作用，这进一步改善了 TPV 的形状恢复 (SR) 和形状固定 (SF)。通过调整残留 ZnO 纳米粒子的含量（MAA/ZnO = 2），增强了 TPV 的拉伸强度（~9.1 MPa）和杨氏模量（~380 MPa），改善了 SF（~99%）和 SR（~98%） :1.3) 和形状变形温度 (120 °C)。