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国家自然科学基金(C200950)

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相关作者:宋永明王清文龚丽李春桃韩广平更多>>
相关机构:东北林业大学更多>>
发文基金:国家自然科学基金国家高技术研究发展计划更多>>
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可膨胀石墨与聚磷酸铵对木粉/聚丙烯复合材料的协同阻燃作用(英文)被引量:5
2011年
采用锥形量热仪(CONE)研究可膨胀石墨(EG)与聚磷酸铵(APP)对木粉/聚丙烯复合材料的协同阻燃作用。CONE测试结果表明:EG和APP均可降低木粉/聚丙烯复合体系的热释放速率(HRR)、总热释放(THR)和烟释放速率(RSR),提高成炭率;与APP相比,EG表现出更好的抑烟效果。当EG与APP的总添加量为15%、复配比例为2∶1时,能形成稳定致密的膨胀炭层,阻燃协同效应显著。力学性能测试结果表明:即使在马来酸酐接枝聚丙烯相容剂(MAPP)的存在下,EG和APP阻燃剂的添加对复合材料的冲击强度和弯曲强度仍有不利影响,但EG的添加可提高复合材料的弯曲模量。
宋永明王清文龚丽李春桃
关键词:木粉聚磷酸铵可膨胀石墨阻燃剂锥形量热仪
Effects of two modification methods on the mechanical properties of wood flour/recycled plastic blends composites: addition of thermoplastic elastomer SEBS-g-MAH and in-situ grafting MAH被引量:2
2010年
The effect of maleic anhydride grafted styrene-ethylene- buty-lene-styrene block copolymer (SEBS-g-MAH) and in-situ grafting MAH on mechanical, dynamic mechanical properties of wood flour/recycled plastic blends composites was investigated. Recycled plastic polypro-pylene (PP), high-density polyethylene (HDPE) and polystyrene (PS), were mixed with wood flour in a high speed blender and then extruded by a twin/single screw tandem extruder system to form wood flour/recycled plastic blends composites. Results show that the impact properties of the composites were improved more significantly by using SEBS-g-MAH compatibilizer than by using the mixtures of MAH and DCP via reactive blending in situ. However, contrary results were ob-served on the tensile and flexural properties of the corresponding com-posites. In General, the mechanical properties of composites made from recycled plastic blends were inferior to those made from virgin plastic blends, especially in elongation break. The morphological study verified that the interfacial adhesion or the compatibility of plastic blends with wood flour was improved by adding SEBS-g-MAH or in-situ grafting MAH. A better interfacial bonding between PP, HDPE, PS and wood flour was obtained by in-situ grafting MAH than the addition of SEBS-g-MAH. In-situ grafting MAH can be considered as a potential way of increasing the interfacial compatibility between plastic blends and wood flour. The storage modulus and damping factor of composites were also characterized through dynamic mechanical analysis (DMA).
宋永明王清文韩广平王海刚高华
关键词:COMPATIBILIZERCOMPOSITES
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