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<p>Crystalline cellulose, characterized by a wide range of sources, excellent mechanical properties and renewability, serves as an ideal substitute for petrochemical products. However, its inability to melt‑process and limited dispersibility substantially hinder its effective integration into most polymer matrices, thereby constraining further progress in the development of crystalline cellulose-based materials. This paper presents a method for effectively lowering the processing temperature through the grafting of long organic chains onto the surface of cellulose nanocrystals (CNCs). The results demonstrate that the modified CNCs, denoted as PCNC-F, exhibit a measurable degree of fluidity at 92.1 °C while maintaining their crystalline structure. PS/PCNC-F composites were prepared via melt-blending polystyrene (PS) and PCNC-F. The PCNC-F exhibits uniform dispersion within the PS matrix and demonstrates a notable reinforcing and toughening effect on the composite. When the PCNC-F content reaches 20 wt%, the tensile strength, elongation at break, impact strength and bending deformation capacity of the composite material increase by 49.02, 85.29, 87.54 and 232.56%, respectively. This study provides a novel strategy for the utilization of crystalline natural polysaccharides in the thermal processing of polymeric materials.</p>

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Preparation and applications of surface-grafted melt-processable cellulose nanocrystals

  • 期刊论文

  • 发表日期：

    2026年5月7日

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  • Chengsheng He,
  • Shanjun Gao,
  • Chunhui Shen,
  • Chunmei Zhang,
  • Zhaojian Ding,
  • Jiaxi Chen

摘要

Crystalline cellulose, characterized by a wide range of sources, excellent mechanical properties and renewability, serves as an ideal substitute for petrochemical products. However, its inability to melt‑process and limited dispersibility substantially hinder its effective integration into most polymer matrices, thereby constraining further progress in the development of crystalline cellulose-based materials. This paper presents a method for effectively lowering the processing temperature through the grafting of long organic chains onto the surface of cellulose nanocrystals (CNCs). The results demonstrate that the modified CNCs, denoted as PCNC-F, exhibit a measurable degree of fluidity at 92.1 °C while maintaining their crystalline structure. PS/PCNC-F composites were prepared via melt-blending polystyrene (PS) and PCNC-F. The PCNC-F exhibits uniform dispersion within the PS matrix and demonstrates a notable reinforcing and toughening effect on the composite. When the PCNC-F content reaches 20 wt%, the tensile strength, elongation at break, impact strength and bending deformation capacity of the composite material increase by 49.02, 85.29, 87.54 and 232.56%, respectively. This study provides a novel strategy for the utilization of crystalline natural polysaccharides in the thermal processing of polymeric materials.