Relating Chemical Structure to Toughness via Morphology Control in Fully Sustainable Sebacic Acid Cured Epoxidized Soybean Oil Toughened Polylactide Blends,Macromolecules

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Relating Chemical Structure to Toughness via Morphology Control in Fully Sustainable Sebacic Acid Cured Epoxidized Soybean Oil Toughened Polylactide Blends
Macromolecules ( IF 5.1 ) Pub Date : 2018-02-28 00:00:00 , DOI: 10.1021/acs.macromol.8b00103
Tong-Hui Zhao ₁ , Wen-Qiang Yuan ₁ , Yi-Dong Li ₁ , Yun-Xuan Weng ₂ , Jian-Bing Zeng _{1,

2}

Affiliation

The use of soybean oil or its derivatives to toughen polylactide (PLA) usually leads to limited toughening efficiency, due to the incompatibility between toughening agents and parent PLA. Herein, we report a dynamic vulcanization method to toughen PLA using sebacic acid cured epoxidized soybean oil (VESO), a fully sustainable and biodegradable component. A series of sebacic acid cured epoxidized soybean oil precursors (SEPs) were prepared with different carboxyl/epoxy equivalent ratio (R), which consequently dictates the chemical structure and the morphology of PLA/VESO blends after the dynamic vulcanization. We demonstrated that the chemical structure of VESO plays a critical role in the compatibility, morphology, and toughness of the PLA/VESO blends. By optimizing the R-value, supertoughened PLA blends can be obtained, as evidenced by the significant improvement in the tensile toughness (up to 150.6 MJ/m³) and the impact strength (up to 542.3 J/m). The results of the toughening mechanism from the morphology study confirm that the chemical structure of VESO is the key indicator of the toughening efficiency. For the PLA/VESO blends, at optimized R-value, the fracture energy can be dissipated efficiently through shear yielding of the PLA matrix induced by internal VESO cavitation to achieve supertoughness.

中文翻译：

通过形态控制控制完全可持续的癸二酸固化的环氧化大豆油增韧聚丙交酯混合物中化学结构与韧性之间的关系

由于增韧剂与母体PLA不相容，使用大豆油或其衍生物增韧聚乳酸（PLA）通常会导致增韧效率有限。本文中，我们报告了一种动态硫化方法，可使用癸二酸固化的环氧化大豆油（VESO）（一种完全可持续且可生物降解的成分）来增韧PLA。制备了一系列不同的羧基/环氧当量比（R）的癸二酸固化的环氧化大豆油前体（SEPs），从而决定了动态硫化后PLA / VESO共混物的化学结构和形态。我们证明了VESO的化学结构在PLA / VESO共混物的相容性，形态和韧性方面起着至关重要的作用。通过优化R可以得到高附加值的超增韧PLA混合物，这可以通过拉伸韧性（最高150.6 MJ / m ³）和冲击强度（最高542.3 J / m）的显着改善来证明。形态研究的增韧机理结果证实，VESO的化学结构是增韧效率的关键指标。对于PLA / VESO共混物，在最佳R值下，可通过内部VESO空化引起的PLA基质的剪切屈服有效地消除断裂能，从而获得超韧性。

更新日期：2018-02-28

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