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首页> 外文期刊>Pro Ligno >MANUFACTURE OF NATURAL FIBER FILLED POLYSTYRENE COMPOSITES ANDTHEIR MICROCELLULAR FOAMS
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MANUFACTURE OF NATURAL FIBER FILLED POLYSTYRENE COMPOSITES ANDTHEIR MICROCELLULAR FOAMS

机译：天然纤维填充的聚苯乙烯复合材料及其微孔泡沫的制备

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In this study, lignocellulosic filler (wood flour or wheat straw flour) and polystyrene-block-poly(ethylene- ran-butylene)-block-polystyrene-graft-maleic anhydride (SEBS-MA) additive were used to manufacture polystyrene-based composites through compression molding. Some of the manufactured composites were foamed using microcellular foaming technology. Mechanical properties such as tensile strength, tensile modulus, elongation at break, flexural strength, flexural modulus and impact strength tests and prefoaming solubility and diffusivity values of composite samples were determined. Densities of the foamed samples were measured. Also morphologies of them were studied using scanning electron microscopy (SEM). In the case of mechanical properties, filler type and filler loading had a significant effect on all mechanical properties investigated. Composites produced with wood flour provided better mechanical properties compared to the one with wheat straw flour. Regardless of filler type, with the increase of filler loading, tensile and flexural strength were reduced while modulus of elasticity and impact strength were improved. With the increase of additive loading, all properties except for elongation at break and impact strength were diminished. Density of composites were increased with filler loading but reduced with additive loading. In general, composites produced with wood flour provided higher densities than the ones produced with wheat straw flours. Before foaming, solubility and diffusivity of manufactured composites were determined. Solubility of composites were reduced with filler loading but not affected by filler type and additive loading. However, at high filler loading, solubility was positively affected by additive loading. In the case of diffusivity, there was a more complex relationship. Diffusivity was significantly affected by all factors (filler type, filler loading and additive loadig). The changes on density (before and after foaming) were also studied and density reductions were calculated. Regardless of filler type, with the increase of filler and additive loading, density reduction of the foamed samples was reduced. Additive had a deleterious affect on density reduction but at high filler loadings this reduction was less severe. Scanning electron microscopy (SEM) of the produced composites was taken. Samples having no filler and additive provided homogenously distributed fine cells. However, regardless of filler type composites with additive and filler provided cells in less number and bigger in size.
机译：在这项研究中，木质纤维素填料（木粉或小麦草粉）和聚苯乙烯-嵌段-聚（乙烯-兰-丁烯）-嵌段-聚苯乙烯-接枝马来酸酐（SEBS-MA）添加剂被用于制造聚苯乙烯基复合材料通过压缩成型。使用微孔发泡技术将一些制造的复合材料发泡。确定了复合材料样品的机械性能，如拉伸强度，拉伸模量，断裂伸长率，弯曲强度，弯曲模量和冲击强度测试以及预发泡溶解度和扩散率值。测量泡沫样品的密度。还使用扫描电子显微镜（SEM）研究了它们的形态。就机械性能而言，填料类型和填料用量对所研究的所有机械性能均具有显着影响。与使用小麦草粉的复合材料相比，使用木粉生产的复合材料具有更好的机械性能。无论填料类型如何，随着填料含量的增加，拉伸强度和弯曲强度都会降低，而弹性模量和冲击强度则会提高。随着添加剂含量的增加，除断裂伸长率和冲击强度外的所有性能均降低。复合材料的密度随着填料的添加而增加，但随着添加剂的添加而降低。通常，用木粉生产的复合材料比用麦草粉生产的复合材料具有更高的密度。在发泡之前，确定所制造的复合材料的溶解度和扩散性。复合材料的溶解度随填料量的增加而降低，但不受填料类型和添加剂量的影响。然而，在高填料负载下，添加剂负载对溶解度有积极影响。在扩散的情况下，存在更复杂的关系。扩散率受所有因素（填料类型，填料载荷和添加剂载荷）的显着影响。还研究了密度变化（发泡前后），并计算了密度降低。不论填料类型如何，随着填料和添加剂含量的增加，泡沫样品的密度降低程度降低。添加剂对密度的降低具有有害影响，但是在高填充量下，这种降低的程度较小。对制得的复合材料进行扫描电子显微镜（SEM）。没有填料和添加剂的样品提供了均匀分布的细孔。然而，无论填料类型是具有添加剂还是填料的复合材料，其提供的孔数量都更少，尺寸更大。

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