Mechanical properties of wood flour/recycled-thermoplastic-blends composites

The mechanical properties of composites prepared from wood flour and thermoplastic blends were investigated. Thermoplastic mixtures of polypropylene (PP) and high-density polyethylene (HDPE) and polystyrene (PS), virgin or recycled, were mixed with wood flour in a high speed blender and then extruded by a specially designed twin/single screw extruder system to form wood-flour/thermoplastic-blends composites (WTBCs). Comparative studies were made to evaluate the effectiveness of the two modification methods of the thermoplastic blends, the one of the addition of maleic anhydride grafted styrene-ethylene-butylene-styrene block copolymer (SEBS-g-MAH) as compatibilizer and the other of blend grafting of maleic anhydride (MAH) using dicumyl peroxide (DCP) as initiator by reactive extrusion. The results showed that the impact properties of WTBCs using SEBS-g-MAH as compatilizer were better improved than that of the blend grafting. However, adverse results were observed on the tensile and flexural properties of the corresponding WTBCs. The mechanical properties of WTBCs prepared from recycled plastic blends were poorer to some extent than that from virgin plastic blends in general, especially in elongation break. The morphology of WTBCs breaking section was analyzed by scanning electron microscopy (SEM) and the results showed that a good interfacial adhesion between wood flour and polymer matrix was observed with both of the two modification methods. However, by blend grafting of adding DCP as initiator and MAH as monomer, a better interfacial bonding between wood and plastic matrix was obtained than that of the addition of SEBS-g-MAH. Blend grafting can be considered as a potential way of increasing the interfacial compatibility of different plastics and between plastic blends and wood.

木粉填充改性多组分废旧塑料专用相容剂的研究

本文介绍了木粉填充改性多组分废旧塑料专用相容剂的研究 ,介绍了 4种专用相容剂的情况 。

新型化工环保材料制品——木塑托盘的技术分析及市场前景

随着市场对木质托盘的需求日益增加 ,为解决木材资源短缺 ,迫切需要一种木质材料替代物。本文介绍了木塑托盘制品的特点及其广阔的市场前景。

SEBS-g-MAH和原位接枝MAH对木粉/废旧塑料混合物复合材料力学性能的影响研究(英文)

由聚丙烯(PP)、高密度聚乙烯(HDPE)和聚苯乙烯(PS)组成的混合废旧塑料与木粉经高速混合机混合后,采用双螺杆/单螺杆串联挤出机组制备了木粉/混合废旧塑料复合材料。探讨了马来酸酐接枝苯乙烯-乙烯/丁烯-苯乙烯嵌段共聚物(SEBS-g-MAH)和原位接枝马来酸酐(MAH)对木粉/混合废旧塑料复合材料力学性能的影响。结果表明,与使用MAH和DCP的原位反应共混相比,SEBS-g-MAH显著提高了复合材料的抗冲击性能,但对拉伸和弯曲性能的改善不如原位反应共混显著。总的来说,混合废旧塑料制备的复合材料的力学性能要低于纯塑料混合物制备的复合材料,尤其是拉伸断裂伸长率。微观形态研究表明,添加SEBS-g-MAH和原位接枝MAH均可提高木粉与塑料混合物之间的界面相容性,但与添加SEBS-g-MAH相比,原位接枝MAH能更好的改善PP、HDPE、PS与木粉之间的界面结合。原位接枝MAH可被看作是一种改善木粉与塑料混合物间界面相容性的有效途径。此外,采用动态力学分析(DMA)进一步表征了复合材料的储能模量和阻尼因子。

废旧聚烯烃塑料/木粉复合材料的性能研究

以马来酸酐接枝聚丙烯(PP-g-MAH)为相容剂,制备了废旧聚烯烃塑料/木粉复合材料,探讨了木粉用量对复合材料加工性能和力学性能的影响。结果表明,随着木粉用量从10%增加到30%,复合材料的熔融时间、熔融能耗以及热稳定性变化不大,剪切扭矩增加了32.4%;且当PP-g-MAH含量为9%、木粉用量为20%左右时,木粉能够有效发挥增韧增强作用,此时复合材料的力学性能最好。

HDPE基木塑复合材料的性能研究

研究了马来酸酐接枝高密度聚乙烯(HDPE-g-MAH)、马来酸酐接枝聚丙烯(PP-g-MAH)、马来酸酐接枝聚醋酸乙烯酯(EVA-g-MAH)、马来酸酐接枝乙烯辛烯共聚物(POE-g-MAH)和木粉的含量对HDPE/木粉复合材料力学性能的影响。结果表明:马来酸酐接枝物的加入可以明显改善木粉与HDPE之间的界面黏结性,提高木塑复合材料的力学性能,HDPE-gMAH的改性效果最为明显;其中POE-g-MAH除了具有明显的增加界面结合力的作用外,对HDPE基体还具有明显的增韧作用。当HDPE-g-MAH质量分数为15%、木粉质量分数为60%时,木塑复合材料的拉伸强度、弯曲强度及弯曲模量分别达到37.3,41.5,2 485 MPa。

SBS对再生PS/废旧ABS/HDPE/木粉复合材料性能的影响

探讨了SBS弹性体对再生PS/废旧ABS/HDPE/木粉复合材料力学性能、加工性能及物理性能的影响。结果表明,适量的SBS可起到良好的增韧作用。当SBS用量为15份时,复合材料的冲击强度可由1.7KJ·m-2增至3.1KJ·m-2,复合材料的拉伸强度、弯曲强度及加工性能虽有下降,但降低幅度不大。同时,引入SBS不仅没有导致复合材料的密度增加,反而进一步降低了复合材料的吸水率,使复合材料的综合性能得以改善。

木粉/废旧塑料复合材料相容性的改进研究

对木粉/回收塑料复合材料采用不同浓度的偶联剂进行处理,经混炼、压片、制样后测试其拉伸性能,弯曲性能和抗冲击性能。通过实验对比分析数据后,得知采用溶液浓度为4%硅烷偶联剂处理后,拉伸强度提高为原来的一倍,弯曲强度也提高了50%;从电镜照片上来看,加入偶联剂之后木粉颗粒与树脂基体之间的间隙减小,木粉与树脂基体连接更紧密。所以使用硅烷偶联剂对木粉/废旧塑料复合材料的界面相容性有一定程度的改善。