In elastomer toughening of polyester plastics, both the particle size distribution of the elastomer and the interfacial strength between the elastomer and matrix are key factors for toughness. In this work, bi-functional polyacrylate elastomers with controllable crosslinking density and reactivity were designed for enhancing the toughness of polyethylene naphthalene (PEN) matrix. Firstly, the elastomers with crosslinked structure possess increased melt viscosity and endowed wide particle size distribution, which contribute to the construct of thin matrix ligament and make PEN matrix more susceptible to shear-yield. Secondly, the high interfacial strength between elastomer and matrix can facilitate the transfer of external stress from PEN matrix to the elastomer, protecting the matrix from destroying. The resulted PEN blends exhibit an excellent impact resistance of 45.20 kJ/m2 and a high tensile toughness of 3.586 MJ/m3, which are 21.73 times and 47.81 times higher, respectively, than the virgin PEN. The present work may provide an effective approach for designing polyester blends with enhanced impact resistance and tensile toughness.

中文翻译：

---

由聚丙烯酸酯弹性体制成的超增韧聚乙烯萘 (PEN)，具有低交联密度和反应性


在聚酯塑料的弹性体增韧中，弹性体的粒径分布以及弹性体与基体之间的界面强度是增韧的关键因素。在这项工作中，设计了具有可控交联密度和反应活性的双官能聚丙烯酸酯弹性体，以增强聚乙烯萘（PEN）基体的韧性。首先，具有交联结构的弹性体具有较高的熔体粘度和较宽的粒径分布，这有助于构建薄的基体韧带，并使PEN基体更容易受到剪切屈服的影响。其次，弹性体与基体之间的高界面强度有利于外部应力从PEN基体传递到弹性体，保护基体不被破坏。所得的 PEN 共混物表现出 45.20 kJ/m2 的优异抗冲击性和 3.586 MJ/m3 的高拉伸韧性，分别是原始 PEN 的 21.73 倍和 47.81 倍。目前的工作可以为设计具有增强的抗冲击性和拉伸韧性的聚酯共混物提供有效的方法。