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首页> 外文期刊>Journal of Applied Polymer Science >Crystallization behavior of α-cellulose short-fiber reinforced poly(lactic acid) composites
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Crystallization behavior of α-cellulose short-fiber reinforced poly(lactic acid) composites

机译：α-纤维素短纤维增强聚乳酸复合材料的结晶行为

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摘要

The isothermal crystallization behavior of α-cellulose short-fiber reinforced poly(lactic acid) composites (PLA/α-cellulose) was examined using a differential scanning calorimeter and a petrographic microscope. Incorporating a natural micro-sized cellulose filler increased the spherulite growth rate of the PLA from 3.35 μm/min for neat PLA at 105°C to a maximum of 5.52 μm/min for the 4 wt % PLA/α-cellulose composite at 105°C. In addition, the inclusion of α-cellulose significantly increased the crystallinities of the PLA/α-cellulose composites. The crystallinities for the PLA/α-cellulose composites that crystallized at 125°C were 48-58%, higher than that of the neat PLA for ～13.5-37.2%. The Avrami exponent n values for the neat and PLA/α-cellulose composites ranged from 2.50 to 2.81 and from 2.45 to 3.44, respectively, and the crystallization rates K of the PLA/α-cellulose composites were higher than those of the neat PLA. The activation energies of crystallization for the PLA/α-cellulose composites were higher than that of the neat PLA. The inclusion of α-cellulose imparted more nucleating sites to the PLA polymer. Therefore, it was necessary to release additional energy and initiate molecular deposition.
机译：使用差示扫描量热仪和岩石显微镜观察了α-纤维素短纤维增强聚乳酸（PLA /α-纤维素）复合材料的等温结晶行为。掺入天然超细纤维素填料可使PLA的球晶生长速率从105°C的纯PLA的3.35μm/ min增加到105°C的4 wt％PLA /α-纤维素复合材料的5.52μm/ min的最大值C。另外，包含α-纤维素显着提高了PLA /α-纤维素复合材料的结晶度。在125°C时结晶的PLA /α-纤维素复合物的结晶度为48-58％，比纯PLA的结晶度高〜13.5-37.2％。纯净和PLA /α-纤维素复合材料的Avrami指数n值分别为2.50至2.81和2.45至3.44，并且PLA /α-纤维素复合物的结晶速率K高于纯PLA。 PLA /α-纤维素复合材料的结晶活化能高于纯PLA。包含α-纤维素为PLA聚合物赋予了更多的成核位点。因此，有必要释放额外的能量并引发分子沉积。

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