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首页> 外文期刊>Journal of Applied Polymer Science >Modified polypropylene wood flour composites. II. Fracture, deformation, and mechanical properties
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Modified polypropylene wood flour composites. II. Fracture, deformation, and mechanical properties

机译：改性聚丙烯木粉复合材料。二。断裂，变形和机械性能

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摘要

The effect of grafting level of maleic anhydride (MA) in the maleated polypropylene (PPMA) on the fracture, deformation mechanisms, and mechanical properties of polypropylene (PP) wood flour composites was studied. Tensile strength, elongation at break, and impact strength are noticeably improved with addition of interfacial modifiers as maximum values of the examined mechanical properties were detected when concentration of MA in the compatibilizer was 1 wt %. To explore the microstructure and deformation mechanisms, scanning electron microscopy was employed. It was found that low concentrations of MA up to I wt % led to the creation of a thin and irregular polymer layer assisted formation of fibrillated plastic deformation zone around the wood particles, while the bulk PP matrix experienced voiding and brittle fracture. Higher concentrations of MA fetch to stronger interaction between PP and wood flour, the reason for brittle fracture and reduced ductility of the matrix. The impact fracture behavior of the composites during Instrumented impact tests is also discussed with respect to the interfacial bond strength. (C) 2004 Wiley Periodicals, Inc. [References: 29]
机译：研究了马来酸酐（MA）在马来酸化聚丙烯（PPMA）中的接枝水平对聚丙烯（PP）木粉复合材料的断裂，变形机理和力学性能的影响。通过添加界面改性剂，可显着改善拉伸强度，断裂伸长率和冲击强度，因为当增容剂中MA的浓度为1 wt％时，检测到的力学性能达到最大值。为了探索其微观结构和变形机理，采用了扫描电子显微镜。已发现低至1wt％的MA的低浓度导致形成薄且不规则的聚合物层，其辅助在木材颗粒周围形成原纤化塑性变形区，而本体PP基质经历空隙和脆性断裂。 MA的浓度越高，PP和木粉之间的相互作用越强，这是脆性断裂和基质延展性降低的原因。还针对界面粘合强度讨论了在仪器冲击试验期间复合材料的冲击断裂行为。 （C）2004 Wiley Periodicals，Inc. [参考：29]

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