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Development of Green Composites Based on Polypropylene and Corncob Agricultural Residue

机译：基于聚丙烯和玉米芯农残的绿色复合材料的开发

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摘要

Green composites of polypropylene (PP) and corncob (CCB) agricultural residue with CCB content ranging from 5 to 30wt% were compounded by melt extrusion and their properties investigated by density measurements, thermogravimetric analyses, differential scanning calorimetry, scanning electron microscopy (SEM) and tension, flexural and impact properties. Properties were dependent on CCB content. SEM micrographs showed that PP/CCB composites are composed of all layers of the corncob, but with a higher content of woody ring and pith. Composites with CCB up to 20wt% presented particles evenly dispersed into PP matrix and density values ranging from 0.929 to 1.026g/cm(3). Thermal analyses showed that CCB is thermally stable up to 200 degrees C, ensuring that no degradation took place during processing, and PP/CCB composites are more crystalline than neat PP. Tensile strength and elongation at break of the composites decreased respectively from 30 to 20MPa, and 22.7 to 3.7%, and the elastic modulus increased while the impact strength remained practically constant at 14J/m for the filling contents tested. Elastic and flexural moduli increased respectively from 906MPa to 1.1GPa and from to 1.26 to 1.81GPa with corncob addition.
机译：通过熔融挤出复合CCB含量为5至30wt％的聚丙烯（PP）和玉米芯（CCB）农业残留物的绿色复合材料，并通过密度测量，热重分析，差示扫描量热法，扫描电子显微镜（SEM）和拉伸，弯曲和冲击性能。属性取决于CCB内容。 SEM显微照片表明，PP / CCB复合材料由玉米芯的所有层组成，但木质环和髓的含量较高。 CCB含量高达20wt％的复合材料呈现出均匀分散在PP基体中的颗粒，密度值为0.929至1.026g / cm（3）。热分析表明，CCB在高达200摄氏度的温度下具有热稳定性，从而确保在加工过程中不会发生降解，并且PP / CCB复合材料比纯PP的结晶性更高。复合材料的拉伸强度和断裂伸长率分别从30 MPa降低到20MPa，从22.7降低到3.7％，弹性模量增加，而冲击强度对于填充物含量却保持恒定在14J / m。添加玉米芯后，弹性模量和弯曲模量分别从906MPa增加到1.1GPa和从1.26增加到1.81GPa。

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  • 来源
    《Journal of Polymers and the Environment》 |2019年第8期|1677-1685|共9页
  • 作者

    Ramos R. R. F.; Siqueira D. D.; Wellen R. M. R.; Leite I. F.; Glenn G. M.; Medeiros E. S.;

  • 作者单位

    Univ Fed Paraiba, Mat & Biosyst Lab LAMAB, Dept Mat Engn, BR-58051900 Joao Pessoa, PB, Brazil|Univ Fed Rio Grande do Norte, Dept Text Engn, BR-59064741 Natal, RN, Brazil;

    Univ Fed Campina Grande, Dept Mat Engn, BR-58429140 Campina Grande, PB, Brazil;

    Univ Fed Paraiba, Mat & Biosyst Lab LAMAB, Dept Mat Engn, BR-58051900 Joao Pessoa, PB, Brazil;

    Univ Fed Paraiba, Mat & Biosyst Lab LAMAB, Dept Mat Engn, BR-58051900 Joao Pessoa, PB, Brazil;

    USDA, Bioprod Res Unit, WRRC, PWA, Albany, CA 94710 USA;

    Univ Fed Paraiba, Mat & Biosyst Lab LAMAB, Dept Mat Engn, BR-58051900 Joao Pessoa, PB, Brazil;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    Composites; Polypropylene; Corncob; Agricultural residues;

    机译：复合材料;聚丙烯;棒棒糖;农业残留物;

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