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<p>In this work, trilayered co-extruded-blown PP/PP/PP and PP/PE/PP films were prepared via co-extrusion blow molding and the influence of stretching ratio (SR) on their microstructure and mechanical properties is detailedly studied. Microstructure characterizations show that there is no layering and separation between layers of aforementioned trilayered co-extruded-blown films. In addition, the molecular chains and lamellar orientation degree of PP/PE/PP and PP/PP/PP films gradually increase with increasing SR, furthermore the orientation degree of former is larger than that of latter. The tensile test shows that, except for SR = 210&#xa0;cm/min, the tensile strength of trilayered PP/PE/PP film is higher than that of PP/PP/PP film, which is attributed to the higher chain and lamellar orientation degree; however, the toughness almost exhibits the opposite tendency. Additionally, trilayered microporous membrane was successfully fabricated by a home-made secondary blowing device. SEM results show that the “root-like” structure are formed in such membrane after secondary blowing and the layers are connected to each other by micropores of trilayered microporous membrane. In light of this, it provides a new approach for preparing the trilayered microporous membrane used in battery separator.</p>

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Crystallization and properties of trilayered co-extruded-blown film without adhesion layers and its corresponding microporous membrane

  • 期刊论文

  • 发表日期：

    2025年6月11日

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  • Zhongzhu Liu,
  • Guoqiang Zheng,
  • Xianhu Liu,
  • Dianbo Zhang,
  • Wei Pan,
  • Qi Qin,
  • Mingli Jiao

摘要

In this work, trilayered co-extruded-blown PP/PP/PP and PP/PE/PP films were prepared via co-extrusion blow molding and the influence of stretching ratio (SR) on their microstructure and mechanical properties is detailedly studied. Microstructure characterizations show that there is no layering and separation between layers of aforementioned trilayered co-extruded-blown films. In addition, the molecular chains and lamellar orientation degree of PP/PE/PP and PP/PP/PP films gradually increase with increasing SR, furthermore the orientation degree of former is larger than that of latter. The tensile test shows that, except for SR = 210 cm/min, the tensile strength of trilayered PP/PE/PP film is higher than that of PP/PP/PP film, which is attributed to the higher chain and lamellar orientation degree; however, the toughness almost exhibits the opposite tendency. Additionally, trilayered microporous membrane was successfully fabricated by a home-made secondary blowing device. SEM results show that the “root-like” structure are formed in such membrane after secondary blowing and the layers are connected to each other by micropores of trilayered microporous membrane. In light of this, it provides a new approach for preparing the trilayered microporous membrane used in battery separator.