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首页> 外文期刊>Journal of Applied Polymer Science >Effect of wood flour loading and thermal annealing on viscoelastic properties of poly(lactic acid) composite films
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Effect of wood flour loading and thermal annealing on viscoelastic properties of poly(lactic acid) composite films

机译：木粉加载量和热退火对聚乳酸复合薄膜粘弹性的影响

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摘要

Poly(lactic acid) (PLA) films filled with up to 50 wt % softwood flour were prepared by melt compounding and thermocompression. Thermal annealing of the melt was performed at temperatures from 90°C to 120°C, for 45 min. Responses on polymer-filler interactions, viscoelastic properties, crystallinity of PLA as well as PLA-wood flour-filled films were investigated by differential scanning calorimetry (DSC), dynamic mechanical analysis (DMA), and scanning electron microscopy (SEM). The effectiveness of fillers on the storage moduli (C) was also calculated. The results reveal that wood flour (WF) in conjunction with thermal annealing affected the melting behavior of PLA matrix, and the glass transition temperature. It was further found that the effectiveness of the wood filler in biocomposites widely improved with thermal annealing as well as with higher WF concentration. Finally, it was found that the compatibility between WF and the PLA matrix can be improved when suitable annealing conditions are applied.
机译：通过熔融复合和热压制备填充至多50重量％的软木粉的聚（乳酸）（PLA）膜。熔体的热退火在90°C至120°C的温度下进行45分钟。通过差示扫描量热法（DSC），动态力学分析（DMA）和扫描电子显微镜（SEM）研究了聚合物-填料相互作用，粘弹性，PLA以及PLA木粉填充膜的结晶度的响应。还计算了填料对储能模量（C）的有效性。结果表明，木粉（WF）结合热退火会影响PLA基质的熔融行为和玻璃化转变温度。进一步发现，通过热退火以及较高的WF浓度，木材填料在生物复合材料中的有效性大大提高。最后，发现当应用合适的退火条件时，WF和PLA基质之间的相容性可以得到改善。

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