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Compatibility of Softwood Flour and Commercial Biopolymers in Injection Molding

机译：软木粉与商用生物聚合物在注塑成型中的相容性

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摘要

This study is focused on wood flour-reinforced biopolymers for injection molding. Eight commercial biopolymers were compounded with 30 and 50% wood flour and injection molded. Thermal processability via extrusion was evaluated by use of the resulting melt pressure, melt temperature, and machine load, during injection molding the injection pressure was taken. Clear increases of melt-and injection pressures could be determined at rising fiber load and better shaping of the molded parts was observed. The mechanical performance of the composites and the neat polymers was evaluated by tensile-, bending-, and impact properties. To study the effects of different fiber concentrations, multiple comparison tests were calculated. High variations in the mechanical properties and in hygroscopic behavior were found between the different biopolymers. Through incorporation of wood flour, the E-modules of all polymers were significantly improved. The strength values of the various biopolymers offered different trends because of the reinforcement. The polylactic acid (PLA) and the cellulose-based polymer Biograde showed significant decreases in strength by addition of wood flour. Scanning electron micrographs of a 50% filled PLA compound revealed low fiber matrix adhesion. Impact strength and elongation at yield of all investigated polymers dropped dramatically with rising fiber content.
机译：这项研究的重点是用于注射成型的木粉增强生物聚合物。将八种市售生物聚合物与30％和50％的木粉混合并注塑。通过使用所得的熔体压力，熔体温度和机器负荷评估通过挤出的热加工性能，在注塑过程中获取注射压力。在纤维负荷增加时，可以确定熔体和注射压力的明显增加，并且观察到成型零件的成型性更好。通过拉伸，弯曲和冲击性能评估了复合材料和纯聚合物的机械性能。为了研究不同纤维浓度的影响，计算了多个比较测试。在不同的生物聚合物之间发现了机械性能和吸湿性能的高度变化。通过掺入木粉，所有聚合物的电子模块得到了显着改善。由于增强，各种生物聚合物的强度值提供了不同的趋势。通过添加木粉，聚乳酸（PLA）和纤维素基聚合物Biograde的强度显着降低。 50％填充的PLA化合物的扫描电子显微照片显示出低的纤维基质附着力。随着纤维含量的增加，所有研究聚合物的冲击强度和屈服伸长率均急剧下降。

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