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Density reduction behaviors and cell morphology in extrusion of LLDPE/wood fiber composites with physical and chemical blowing agents
Journal of Applied Polymer Science ( IF 2.7 ) Pub Date : 2019-12-16 , DOI: 10.1002/app.48829 Gangjian Guo 1
Journal of Applied Polymer Science ( IF 2.7 ) Pub Date : 2019-12-16 , DOI: 10.1002/app.48829 Gangjian Guo 1
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Foamed wood fiber/plastic composites (WPC) with a fine‐cell structure offer many benefits compared with the unfoamed WPC, such as the reduced material cost and density, the improved toughness, and the enhanced processability. However, it is extremely challenging to achieve the desired density reduction and obtain a fine‐cell structure simultaneously. One of the obstacles is that the volatiles released from the wood fiber (WF) during processing should be suppressed to ensure a fine‐cell structure. Linear low‐density polyethylene (LLDPE) has a relatively low melting temperature, and it can reduce the processing temperature and suppress volatiles when used as a polymer matrix for foamed WPC. This paper systematically investigates the foamability of LLDPE/WF composites in a continuous foam extrusion, with both a chemical blowing agent and a physical blowing agent (PBA). It turns out that the PBA‐based foaming led to a smaller cell size and a narrower cell size distribution. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020, 137, 48829.
中文翻译：
具有物理和化学发泡剂的LLDPE /木纤维复合材料挤出时的密度降低行为和细胞形态
与未发泡的WPC相比，具有细孔结构的发泡木纤维/塑料复合材料（WPC）具有许多优势，例如降低了材料成本和密度，提高了韧性并增强了可加工性。但是，要实现所需的密度降低并同时获得细孔结构是极富挑战性的。障碍之一是在加工过程中应抑制木纤维（WF）释放的挥发物，以确保细孔结构。线性低密度聚乙烯（LLDPE）具有相对较低的熔融温度，当用作发泡WPC的聚合物基质时，它可以降低加工温度并抑制挥发物。本文系统地研究了LLDPE / WF复合材料在连续泡沫挤出中的起泡性，同时使用化学发泡剂和物理发泡剂（PBA）。事实证明，基于PBA的发泡导致较小的泡孔尺寸和较窄的泡孔尺寸分布。分级为4 +©2019 Wiley Periodicals，Inc.J.Appl。Polym。科学2020，137，48829。
更新日期：2020-03-27
中文翻译：
具有物理和化学发泡剂的LLDPE /木纤维复合材料挤出时的密度降低行为和细胞形态
与未发泡的WPC相比，具有细孔结构的发泡木纤维/塑料复合材料（WPC）具有许多优势，例如降低了材料成本和密度，提高了韧性并增强了可加工性。但是，要实现所需的密度降低并同时获得细孔结构是极富挑战性的。障碍之一是在加工过程中应抑制木纤维（WF）释放的挥发物，以确保细孔结构。线性低密度聚乙烯（LLDPE）具有相对较低的熔融温度，当用作发泡WPC的聚合物基质时，它可以降低加工温度并抑制挥发物。本文系统地研究了LLDPE / WF复合材料在连续泡沫挤出中的起泡性，同时使用化学发泡剂和物理发泡剂（PBA）。事实证明，基于PBA的发泡导致较小的泡孔尺寸和较窄的泡孔尺寸分布。分级为4 +©2019 Wiley Periodicals，Inc.J.Appl。Polym。科学2020，137，48829。
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