Supertough Polylactide Blend Foams with Controlled Cell Size

IF 5.1 1区化学 Q1 POLYMER SCIENCE

Macromolecules Pub Date : 2024-10-30 DOI:10.1021/acs.macromol.4c02051

Minghui Wu, Qian Ren, Xueyun Li, Peng Gao, Long Wang, Wenge Zheng, Ping Cui, Xiaosu Yi, Wei Yang

引用次数: 0

Abstract

The mechanical properties of polymeric foams are strongly associated with their cellular structure. However, the relationship between the cellular structure and the mechanical behavior of polymeric foams is complicated by the interdependence of cell size and expansion ratio. Herein, we explored the relationship between cell size and impact strength in poly(lactic acid) (PLA)/rubber blend foams by controlling the cell size while maintaining a constant expansion ratio. Surprisingly, a cell size-induced brittle-to-tough transition was observed at a critical cell size. Foams exhibited brittleness when the cell size exceeded this critical threshold, whereas smaller cell sizes led to improved toughness. The increased toughness was attributed to the robust interaction of stress fields generated by adjacent cells and rubber particles, which could hinder the progression of cell-induced crazes into cracks, resulting in greater energy absorption. This study provides a universal strategy for enhancing the resilience of polymer/rubber blend foams.

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具有可控细胞尺寸的超韧聚乳酸混合泡沫

聚合物泡沫的机械特性与其细胞结构密切相关。然而，由于细胞尺寸和膨胀率之间的相互依存关系，细胞结构与聚合物泡沫机械性能之间的关系变得复杂。在此，我们通过在保持恒定膨胀比的情况下控制细胞大小，探索了聚乳酸（PLA）/橡胶混合泡沫中细胞大小与冲击强度之间的关系。令人惊讶的是，在临界孔径处观察到了由孔径引起的脆性向韧性的转变。当泡孔尺寸超过这个临界值时，泡沫会表现出脆性，而较小的泡孔尺寸则会提高韧性。韧性的提高归因于相邻细胞和橡胶颗粒所产生的应力场的强相互作用，这可能会阻碍细胞诱发的裂纹发展成裂缝，从而产生更大的能量吸收。这项研究为增强聚合物/橡胶混合泡沫的韧性提供了一种通用策略。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Macromolecules 工程技术-高分子科学

CiteScore

9.30

自引率

16.40%

发文量

942

审稿时长

2 months

期刊介绍： Macromolecules publishes original, fundamental, and impactful research on all aspects of polymer science. Topics of interest include synthesis (e.g., controlled polymerizations, polymerization catalysis, post polymerization modification, new monomer structures and polymer architectures, and polymerization mechanisms/kinetics analysis); phase behavior, thermodynamics, dynamic, and ordering/disordering phenomena (e.g., self-assembly, gelation, crystallization, solution/melt/solid-state characteristics); structure and properties (e.g., mechanical and rheological properties, surface/interfacial characteristics, electronic and transport properties); new state of the art characterization (e.g., spectroscopy, scattering, microscopy, rheology), simulation (e.g., Monte Carlo, molecular dynamics, multi-scale/coarse-grained modeling), and theoretical methods. Renewable/sustainable polymers, polymer networks, responsive polymers, electro-, magneto- and opto-active macromolecules, inorganic polymers, charge-transporting polymers (ion-containing, semiconducting, and conducting), nanostructured polymers, and polymer composites are also of interest. Typical papers published in Macromolecules showcase important and innovative concepts, experimental methods/observations, and theoretical/computational approaches that demonstrate a fundamental advance in the understanding of polymers.