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Enhancement in isothermal crystallization and thermomechanical properties of poly(L‐lactic acid) filled with carbon fiber powder
Polymer Composites ( IF 4.8 ) Pub Date : 2020-06-20 , DOI: 10.1002/pc.25682 Li Chen 1 , Xiujiang Pang 2 , Guangshui Yu 1 , Jiwen Liu 1 , Haiqing Hu 1 , Jian Zhao 1
Polymer Composites ( IF 4.8 ) Pub Date : 2020-06-20 , DOI: 10.1002/pc.25682 Li Chen 1 , Xiujiang Pang 2 , Guangshui Yu 1 , Jiwen Liu 1 , Haiqing Hu 1 , Jian Zhao 1
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Carbon fiber (CF) is one good carbon filler for polymer modification. The aspect ratio of CF is supposed to affect the modification. In this research, the dependence of the crystallization behavior and thermomechanical properties of poly(L‐lactic acid) (PLLA) upon the aspect ratio of CF was investigated systematically by utilizing various characterizations, including polarized light microscopy, scanning electron microscopy, wide‐angle X‐ray diffraction, differential scanning calorimetry, X‐ray photoelectron spectroscopy, static and dynamic mechanical properties, thermal stability, and thermal conductivity. Results indicated that carbon fiber powder (CFP) with smaller aspect ratio displayed more obvious heterogeneous nucleation and accelerating effect on the isothermally melt crystallization of PLLA matrix than normal CF with bigger aspect ratio. In the meanwhile, CFP had less adverse effect on the perfection of α crystal of PLLA than CF. Compared with PLLA or PLLA/CF composite, the tensile strength or the elongation at break of PLLA/CFP composite could be enhanced through proper annealing treatment. The bigger upshift of Tg determined by dynamic mechanical analysis indicated superior adhesion between PLLA and CFP in PLLA/CFP composites to that in PLLA/CF composites. Besides, CFP improved the thermal stability and thermal conductivity of PLLA composites more efficiently than CF.
中文翻译：
碳纤维粉末填充的聚（L-乳酸）的等温结晶和热机械性能的增强
碳纤维（CF）是一种用于聚合物改性的良好碳填料。CF的纵横比应该影响修改。在这项研究中，通过利用偏振光显微镜，扫描电子显微镜，广角镜等各种表征，系统地研究了聚（L-乳酸）（PLLA）的结晶行为和热机械性能对CF纵横比的依赖性。 X射线衍射，差示扫描量热法，X射线光电子能谱，静态和动态力学性能，热稳定性和导热性。结果表明，长径比较小的碳纤维粉末（CFP）比长径比较大的CF对PLLA基质的等温熔体结晶具有更明显的异质成核和促进作用。同时，CFP对PLLA的α晶完善的不利影响小于CF。与PLLA或PLLA / CF复合材料相比，通过适当的退火处理可以提高PLLA / CFP复合材料的拉伸强度或断裂伸长率。更大的升档通过动态力学分析确定的T g表明，PLLA / CFP复合材料中PLLA和CFP之间的粘合力优于PLLA / CF复合材料中。此外，CFP比CF更有效地改善了PLLA复合材料的热稳定性和导热性。
更新日期：2020-06-20
中文翻译：
碳纤维粉末填充的聚（L-乳酸）的等温结晶和热机械性能的增强
碳纤维（CF）是一种用于聚合物改性的良好碳填料。CF的纵横比应该影响修改。在这项研究中，通过利用偏振光显微镜，扫描电子显微镜，广角镜等各种表征，系统地研究了聚（L-乳酸）（PLLA）的结晶行为和热机械性能对CF纵横比的依赖性。 X射线衍射，差示扫描量热法，X射线光电子能谱，静态和动态力学性能，热稳定性和导热性。结果表明，长径比较小的碳纤维粉末（CFP）比长径比较大的CF对PLLA基质的等温熔体结晶具有更明显的异质成核和促进作用。同时，CFP对PLLA的α晶完善的不利影响小于CF。与PLLA或PLLA / CF复合材料相比，通过适当的退火处理可以提高PLLA / CFP复合材料的拉伸强度或断裂伸长率。更大的升档通过动态力学分析确定的T g表明，PLLA / CFP复合材料中PLLA和CFP之间的粘合力优于PLLA / CF复合材料中。此外，CFP比CF更有效地改善了PLLA复合材料的热稳定性和导热性。
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