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首页> 外文期刊>Journal of Applied Polymer Science >On the use of tris(nonylphenyl) phosphite as a chain extender in melt-blended poly(hydroxybutyrate-co-hydroxyvalerate)/clay nanocomposites: Morphology, thermal stability, and mechanical properties
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On the use of tris(nonylphenyl) phosphite as a chain extender in melt-blended poly(hydroxybutyrate-co-hydroxyvalerate)/clay nanocomposites: Morphology, thermal stability, and mechanical properties

机译：关于使用三（壬基苯基）亚磷酸酯作为熔融共混聚（羟基丁酸酯-co-羟基戊酸酯）/粘土纳米复合材料中的扩链剂的形态，热稳定性和机械性能

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The influence of the incorporation of tris(nonylphenyl) phosphite (TNPP) as a chain extender on the morphology and thermal stability of poly(hydroxybutyrate-co-hydroxyvalerate) (PHBV)/clay nanocomposites obtained by melt mixing has been studied. Two different clays have been used: a laminar organomodified montmorillonite (Cloisite (R) 30B) and a tubular unmodified halloysite (HNT). The morphology of the so-obtained nanocomposites has been assessed by transmission electron microscopy, scanning electron microscopy, and wide angle X-ray diffraction, showing a partially exfoliated structure for PHBV/Cloisite (R) 30B nanocomposites, as well as a good dispersion of the HNT in the PHBV matrix. The crystallinity of the resulting nanocomposites, determined by DSC, does not change when clays or TNPP are added. An increase in the onset temperature of thermal degradation of PHBV has been obtained with the addition of TNPP, as determined by TGA. With regard to the effect of the nanoclays on the thermal stability of PHBV, the onset temperature of the PHBV/HNT nanocomposites is higher than that of the pure PHBV, while this trend is not observed for the nanocomposites containing Cloisite (R) 30B. The addition of TNPP to the PHBV/Cloisite (R) 30B nanocomposites resulted in an improved thermal stability; however, for the HNT nanocomposites, the TNPP does not seem to have a significant effect. For all studied systems, it was shown that the variation of mechanical properties of the nanocomposites is due to the reinforcing effect of the nanoclays on the PHBV matrix. In the case of TNPP, it is due to the increased molecular weight and formation of a long-chain branching structure. (C) 2015 Wiley Periodicals, Inc.
机译：研究了三（壬基苯基）亚磷酸三（壬基苯基）酯作为扩链剂的加入对通过熔融混合获得的聚（羟基丁酸酯-共-羟基戊酸酯）（PHBV）/粘土纳米复合材料的形态和热稳定性的影响。已经使用了两种不同的粘土：层状有机改性的蒙脱石（Cloisite（R）30B）和管状的未改性的埃洛石（HNT）。如此获得的纳米复合材料的形态已通过透射电子显微镜，扫描电子显微镜和广角X射线衍射进行了评估，显示出PHBV / Cloisite（R）30B纳米复合材料的部分剥落结构以及其良好的分散性。 PHBV矩阵中的HNT。当添加粘土或TNPP时，由DSC测定的所得纳米复合材料的结晶度不会改变。如通过TGA所确定的，通过添加TNPP已经获得了PHBV的热降解起始温度的升高。关于纳米粘土对PHBV热稳定性的影响，PHBV / HNT纳米复合材料的起始温度高于纯PHBV的起始温度，而对于含有Cloisite（R）30B的纳米复合材料则未观察到这种趋势。向PHBV / Cloisite（R）30B纳米复合材料中添加TNPP可以提高热稳定性。但是，对于HNT纳米复合材料，TNPP似乎没有显著作用。对于所有研究的系统，已表明纳米复合材料的机械性能变化是由于纳米粘土对PHBV基质的增强作用所致。在TNPP的情况下，这是由于分子量增加和形成了长链支化结构。 （C）2015年Wiley Periodicals，Inc.

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