Fully biobased, thermally remoldable, and highly tough blends were formulated from epoxidized soybean oil (ESO) and poly(lactic acid) (PLA) in a large-scale production via twin-screw extrusion and injection molding. During the melt-compounding of PLA and ESO, self-polymerization of ESO occurred in the presence of cationic initiator to form a polymerized ESO (PESO) rubbery phase within PLA matrix. The weight ratios of ESO to PLA ranging from 1:9 to 4:6 were designed to tailor the properties of the formed PESO/PLA blends such as crystallization behavior, rheological properties, mechanical properties, thermal stabilities, and morphologies. The PESO/PLA blends exhibited significantly increased elongation at break, tensile toughness, crystallinity, and complex viscosity when compared to pure PLA due to the formation of a two-phase separated structure in the blends; however, significant decreases in tensile strength, tensile modulus, storage modulus, and glass transition temperature of the blends were observed after the addition of ESO.

中文翻译：

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通过双螺杆挤出机中的动态交联从环氧大豆油和聚乳酸生产可热重塑的共混物

由环氧化大豆油（ESO）和聚乳酸（PLA）制成的全生物基，可热重塑和高韧性共混物，可通过双螺杆挤出和注塑成型进行大规模生产。在PLA和ESO的熔融混合过程中，ESO的自聚合在阳离子引发剂的存在下发生，从而在PLA基质内形成了聚合的ESO（PESO）橡胶相。设计ESO与PLA的重量比范围为1：9至4：6，以调整所形成的PESO / PLA共混物的性质，例如结晶行为，流变性质，机械性质，热稳定性和形态。PESO / PLA共混物的断裂伸长率，拉伸韧性，结晶度，与纯PLA相比，由于在共混物中形成了两相分离的结构，因此具有复杂的粘度；然而，在加入ESO后，共混物的拉伸强度，拉伸模量，储能模量和玻璃化转变温度显着下降。