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首页> 外文期刊>Journal of Polymers and the Environment >Investigation of Polypropylene-Montmorillonite Clay Nanocomposite Films Containing a Pro-degradant Additive
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Investigation of Polypropylene-Montmorillonite Clay Nanocomposite Films Containing a Pro-degradant Additive

机译：含助降解剂的聚丙烯-蒙脱土粘土纳米复合薄膜的研究

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摘要

This paper investigates the performance of polypropylene (PP) incorporated with montmorillonite (MMT) nanoclay, maleic anhydride grafted PP (PP-g-MAH), and pro-degradant additive (TDPAA (R)), which provides additional benefits of increasing biodegradability. A twin-screw extruder was used to compound PP, MMT, PP-g-MAH, and TDPA, and the extruded nanocomposite films were collected for testing, and their mechanical, thermal, barrier, oxo-biodegradability, and morphological properties were evaluated. Tensile test, differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), oxygen permeability test, soil burial test, X-ray diffraction (XRD), transmission electron microscopy (TEM), and scanning electron microscope (SEM) analysis were used to investigate these properties. Increasing MMT content from 1 to 3 phr increases tensile strength and Young's modulus of the neat PP samples up to ca.45% and 27% respectively. Improvement of thermal properties for neat PP samples was observed by increasing MMT content from 1 to 3 phr. However, at 4 phr MMT content, both mechanical and thermal properties of nanocomposites dropped slightly. For soil buried samples, DSC and TGA results revealed significant changes in the thermal properties for PP samples containing TDPE additive compared to neat PP, clearly confirming the effectiveness of this TDPA additive in promoting oxo-biodegradation process of PP. Similarly weight loss evaluation result shows that about 4% weight loss for sample (PP/TD), which is PP and TDPA blend only, compared to neat PP. However, increasing MMT content from 1 to 4 phr slightly reduced weight loss of PP from 3.5 to 1.5%, respectively, for 6 month soil exposure period, which indicates that increasing MMT content was detrimental to the degradation process. For higher MMT content, the oxygen permeability of PP nanocomposites was decreased by 46% of the corresponding values for neat PP. The XRD and TEM results confirmed the exfoliation structure of the nanocomposites. The morphological change after soil burial test was studied using scanning electron microscopy (SEM).
机译：本文研究了掺有蒙脱石（MMT）纳米粘土，马来酸酐接枝的聚丙烯（PP-g-MAH）和促降解添加剂（TDPAA（R））的聚丙烯（PP）的性能，它提供了提高生物降解性的其他好处。使用双螺杆挤出机复合PP，MMT，PP-g-MAH和TDPA，收集挤出的纳米复合膜进行测试，并评估其机械，热，阻隔，氧代生物降解性和形态学性能。使用拉伸试验，差示扫描量热法（DSC），热重分析（TGA），透氧性试验，土壤掩埋试验，X射线衍射（XRD），透射电子显微镜（TEM）和扫描电子显微镜（SEM）分析研究这些特性。将MMT含量从1 phr增加到3 phr可以将纯PP样品的拉伸强度和杨氏模量分别提高到大约45％和27％。通过将MMT含量从1 phr增加到3 phr，可以观察到纯PP样品的热性能有所改善。然而，在4 phr MMT含量下，纳米复合材料的机械性能和热性能均略有下降。对于土壤埋藏样品，DSC和TGA结果显示，与纯PP相比，含TDPE添加剂的PP样品的热性能发生了显着变化，从而明确证实了这种TDPA添加剂在促进PP的氧化-生物降解过程中的有效性。类似的失重评估结果显示，与纯PP相比，仅是PP和TDPA混合物的样品（PP / TD）失重约4％。但是，在暴露于土壤的6个月期间，将MMT含量从1 phr增加到4 phr会使PP的重量损失分别从3.5％减少到1.5％，这表明增加MMT含量对降解过程有害。对于更高的MMT含量，PP纳米复合材料的透氧性降低了纯PP相应值的46％。 XRD和TEM结果证实了纳米复合材料的剥离结构。利用扫描电子显微镜（SEM）研究了土葬后的形态变化。

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