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首页> 外文期刊>Journal of Thermal Analysis and Calorimetry >Dispersion evaluation of microcrystalline cellulose/cellulose nanofibril-filled polypropylene composites using thermogravimetric analysis
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Dispersion evaluation of microcrystalline cellulose/cellulose nanofibril-filled polypropylene composites using thermogravimetric analysis

机译：热重分析法评估微晶纤维素/纤维素纳米原纤维填充聚丙烯复合材料的分散性

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摘要

Microcrystalline cellulose-filled polypropylene (PP) composites and cellulose nanofiber-filled composites were prepared by melt blending. The compounded material was used to evaluate dispersion of cellulose fillers in the polypropylene matrix. Thermogravimetric analysis (TG) and mechanical testing were conducted on composites blended multiple times and the results were compared with single batch melt blended composites. The residual mass, tensile strength, and coefficient of variance values were used to evaluate dispersion of the microcrystalline cellulose fillers in the PP matrix. The potential of using TG to evaluate cellulose nanofiber-filled thermoplastic polymers was also investigated and it was found that the value and variability of residual mass after TG measurements can be a criterion for describing filler dispersion. A probabilistic approach is presented to evaluate the residual mass and tensile strength distribution, and the correlation between those two properties. Both the multiple melt blending and single batch composites manufactured with increased blending times showed improved filler dispersion in terms of variation and reliability of mechanical properties. The relationship between cellulose nanofiber loading and residual mass was in good agreement with the rule of mixtures. In this article, the authors propose to use a novel method for dispersion evaluation of natural fillers in a polymer matrix using TG residual mass analysis. This method can be used along with other techniques such as scanning electron microscope (SEM), transmission electron microscope (TEM), and X-ray diffraction (XRD) for filler dispersion evaluation in thermoplastic composites.
机译：通过熔融共混制备微晶纤维素填充的聚丙烯（PP）复合材料和纤维素纳米纤维填充的复合材料。该复合材料用于评估纤维素填料在聚丙烯基质中的分散性。对多次混合的复合材料进行了热重分析（TG）和力学性能测试，并将结果与​​单批熔融混合的复合材料进行了比较。残余质量，抗张强度和方差系数值用于评估微晶纤维素填料在PP基体中的分散性。还研究了使用TG评估纤维素纳米纤维填充的热塑性聚合物的潜力，发现TG测量后残留质量的值和变异性可以作为描述填料分散性的标准。提出了一种概率方法来评估残余质量和拉伸强度分布，以及这两个属性之间的相关性。在增加的共混时间下制造的多熔体共混和单批复合材料在机械性能的变化和可靠性方面均表现出改善的填料分散性。纤维素纳米纤维负载量和残余质量之间的关系与混合物的规则非常吻合。在本文中，作者建议使用一种新方法，通过TG残留质量分析法评估天然填料在聚合物基质中的分散性。此方法可与其他技术（例如扫描电子显微镜（SEM），透射电子显微镜（TEM）和X射线衍射（XRD））一起用于热塑性复合材料中的填料分散性评估。

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