近日，杭州师范大学李勇进团队报道了弹性萨拉米颗粒反应共混克服全聚合物基合金韧性和刚度的权衡。相关论文发表在2026年2月9日出版的《中国高分子科学杂志》上。

橡胶增韧热塑性材料因其轻质特性及优异的综合性能组合，已在现代社会中无处不在。尽管需求日益增长，但开发兼具轻质、高强度与高韧性的聚合物合金仍面临持续挑战。

受商用丙烯腈-丁二烯-苯乙烯共聚物（ABS）和高抗冲聚苯乙烯（HIPS）中独特的“萨拉米”微观结构启发，研究组开发了一种简便方法，借助弹性体萨拉米粒子克服全聚合物合金在提升韧性与刚性之间的权衡问题。该策略利用互补反应基团，将刚性聚乳酸（PLLA）链预接枝于甲基丙烯酸缩水甘油酯接枝的辛烯-乙烯共聚物（POE-g-GMA）上。可以预见，与聚丙烯（PP）具有强不相容性的PLLA接枝链在后续熔融共混过程中将固定于弹性体相内，从而在聚丙烯基体中促进“硬核（PLLA）-软壳（聚烯烃弹性体，POE）”粒子的原位形成。

含有弹性体萨拉米粒子的全聚合物合金表现出前所未有的性能组合：其缺口冲击强度高达56.8 kJ/m²，同时拉伸强度（36.8 MPa）与杨氏模量（0.93 GPa）甚至高于纯聚丙烯基体。此外，该材料无需添加增强纳米填料即实现轻量化，性能可与工业工程塑料竞争。这一普适且高效的策略有望适用于任意橡胶增韧/增强体系，为先进全聚合物合金的设计提供了新范式。

附：英文原文

Title: Overcoming the Trade-off between Toughness and Stiffness of Fully Polymer-based Alloys by Elastomeric Salami Particles through Reactive Blending

Author: Yan Xia, Ming-Hui Sang, Xiao Wang, Ning He, Heng-Ti Wang, Yong-Jin Li

Issue&Volume: 2026-02-09

Abstract: Rubber-toughened thermoplastic materials have become ubiquitous in modern society owing to their lightweight nature and desirable combination of advantageous performances. Despite the ever-increasing demand, the development of polymer alloys that are lightweight, high-strength, and high-toughness remains an ongoing challenge. Inspired by the unique “salami” microstructure from commercial acrylonitrile butadiene styrene copolymer (ABS) and high-impact polystyrene (HIPS), a facile approach was developed to overcome the trade-off between enhancing the toughness and rigidity of fully polymer-based alloys by virtue of elastomeric salami particles. This strategy entails pre-grafting rigid poly(lactic acid) (PLLA) chains with glycidyl methacrylate-grafted octene ethylene copolymer (POE-g-GMA) using complementary reactive groups. It can be envisaged that the PLLA grafts featuring strong incompatibility with polypropylene (PP) remain fixed in elastomer phase upon the subsequent melt compounding, facilitating the in situ formation of “hard core (PLLA)-soft shell (polyolefin elastomer, POE)” particles in polypropylene (PP) matrix. The all-polymer alloys containing elastomeric salami particles demonstrated unprecedented performance combinations, including upper notched impact strengths (56.8 kJ/m2), even higher tensile strength (36.8 MPa), and Young’s modulus (0.93 GPa) than that of the PP matrix. Furthermore, these materials are lightweight without the incorporation of reinforcing nano-fillers, which is competitive with industrial engineering plastics. It is highly anticipated that this universal and highly efficient protocol will be appropriate for arbitrary rubber toughened/reinforced systems, offering a paradigm in the design of advanced all-polymer alloys.

DOI: 10.1007/s10118-025-3541-1

Source: https://www.cjps.org/en/article/doi/10.1007/s10118-025-3541-1/