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首页> 外文期刊>Journal of Applied Polymer Science >Structure variation and properties enhancement of uniaxial stretching poly(l-lactic acid)/eggshell powder composites
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Structure variation and properties enhancement of uniaxial stretching poly(l-lactic acid)/eggshell powder composites

机译：单轴拉伸聚（L-乳酸）/蛋壳粉末复合材料的结构变化和性能增强

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摘要

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 alpha-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. (c) 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 48158.
机译：可生物降解的聚（L-乳酸）（PLLA）/蛋壳（ES）通过熔融共混和单轴上述PLLA的玻璃化转变温度下拉伸制得的粉末的复合材料。扫描电子显微镜分析显示出现在拉伸复合材料是微孔。孔隙率受两个因素影响，拉伸比，和ES内容。差示扫描量和广角X射线衍射结果表明，在α型应变诱导结晶可以在PLLA基质中来实现。这上层建筑提高PLLA复合材料的多功能性能。强度，模量和拉伸PLLA90 / ES10复合材料的6的拉伸比的延展性的特殊的结合进行了论证，超过断裂断裂强度，模量和伸长率的148，190，和507％的增量整齐PLLA（ 140.8兆帕，3810兆帕，和35.2％），分别。同时，通过调节复合材料的组合物和/或拉伸比得到的热机械性能，由于高结晶度和孔隙率从得到的可控降解​​率的提高。 （c）2019 Wiley期刊，Inc.J.Phill。聚合物。 SCI。 2019年，136，48158。

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