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首页> 外文期刊>Journal of Applied Polymer Science >Improvement of mechanical properties of polylactide by equal channel multiple angular extrusion
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Improvement of mechanical properties of polylactide by equal channel multiple angular extrusion

机译：等通道多角度挤出改善挥之不键的力学性能

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摘要

The combination of high strength and toughness is always the goal of high-performance polymer materials for industrial use. This study addresses the potentialities of a solid state equal-channel multiple-angular extrusion (ECMAE) in production of polylactide (PLA) with simultaneous improvement in toughness, strength, and thermal stability. Chain extender Joncryl was used to form PLA with different chain length and morphology (linear or branched PLA). It is demonstrated that simple shear deformation implemented in ECMAE results in formation of an orientation order, an increase in the degree of crystallinity, and the creation of alpha crystals with an increased degree of perfection. The value of the effects achieved depends on the type of PLA morphology. The best result is observed in the case of linear PLA. ECMAE-modified linear PLA possess the better combination of strength, modulus, and ductility than the branched one. Compared with neat linear PLA, ECMAE-modified linear PLA shows 12%, 26%, 217%, and 40% increase in tensile strength, Young's modulus, strain at break and impact strength, respectively. Additionally, the storage modulus shows an improved thermal stability of ECMAE-modified PLA.
机译：高强度和高韧性的结合一直是工业用高性能聚合物材料的目标。本研究探讨了固态等通道多角挤压（ECMAE）在聚乳酸（PLA）生产中同时提高韧性、强度和热稳定性的潜力。扩链剂Joncryl用于形成不同链长和形态的聚乳酸（线性或分支聚乳酸）。结果表明，在ECMAE中实现的简单剪切变形会导致取向顺序的形成、结晶度的增加，以及α晶体的生成和完善程度的增加。效果的价值取决于PLA形态的类型。在线性PLA的情况下观察到最好的结果。ECMAE改性线性PLA比支化PLA具有更好的强度、模量和延展性组合。与纯线性聚乳酸相比，ECMAE改性线性聚乳酸的拉伸强度、杨氏模量、断裂应变和冲击强度分别提高了12%、26%、217%和40%。此外，储能模量表明ECMAE改性PLA的热稳定性得到改善。

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