Structure variation and properties enhancement of uniaxial stretching poly(l‐lactic acid)/eggshell powder composites,Journal of Applied Polymer Science

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Structure variation and properties enhancement of uniaxial stretching poly(l‐lactic acid)/eggshell powder composites
Journal of Applied Polymer Science ( IF 2.7 ) Pub Date : 2019-06-22 , DOI: 10.1002/app.48158
Yi Li _{1,

2} , Changyu Han ₂ , Yancun Yu ₂ , Dexin Huang ₁

Affiliation

Biodegradable poly(l‐lactic acid) (PLLA)/eggshell (ES) powder composites were prepared by melt blending and uniaxial stretching above the glass‐transition temperature of PLLA. Scanning electron microscopy analyses revealed that micropores appeared in stretched composites. Porosity was affected by two factors, stretch ratios, and ES contents. Differential scanning calorimetry and wide‐angle X‐ray diffraction results demonstrated that strain‐induced crystallization in α‐form could be achieved in PLLA matrix. This superstructure improved multifunctional performance of PLLA composites. The exceptional combination of strength, modulus, and ductility of stretched PLLA90/ES10 composites with a stretch ratio of 6 were demonstrated, exceeding neat PLLA with the increments of 148, 190, and 507% in breaking strength, modulus, and elongation at break (140.8 MPa, 3810 MPa, and 35.2%), respectively. Meanwhile, the enhancement of thermomechanical properties due to high crystallinity and controllable degradation rates resulting from porosity were obtained by adjusting the composites compositions and/or stretch ratios. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 48158.

中文翻译：

单轴拉伸聚（乳酸）/蛋壳粉复合材料的结构变化和性能增强

可生物降解聚（升乳酸（PLLA）/蛋壳（ES）粉末复合材料是通过熔融共混和在PLLA的玻璃化转变温度以上单轴拉伸制备的。扫描电子显微镜分析表明，微孔出现在拉伸的复合材料中。孔隙率受两个因素的影响，拉伸比和ES含量。差示扫描量热法和广角X射线衍射结果表明，在PLLA基质中可以实现应变诱导的α型结晶。这种上层结构改善了PLLA复合材料的多功能性能。已证明拉伸比为6的拉伸PLLA90 / ES10复合材料的强度，模量和延展性的特殊组合，超过了纯PLLA，其断裂强度，模量和断裂伸长率分别增加了148、190和507％（ 140.8 MPa，3810 MPa和35。2％）。同时，通过调节复合材料的组成和/或拉伸比，获得了由于高结晶度引起的热机械性能的增强和由孔隙率引起的可控制的降解速率。分级为4 +©2019 Wiley Periodicals，Inc.J.Appl。Polym。科学2019，136，48158。

更新日期：2019-06-22

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