纤维素成分和制备方法对聚氨酯-纤维素复合材料力学性能的影响。
Effect of cellulose compositions and fabrication methods on mechanical properties of polyurethane-cellulose composites.
机构信息
Department of Materials Science and Engineering, National Taiwan University, Taipei 10617, Taiwan.
Department of Chemical and Materials Engineering, Chang Gung University, Taoyuan 33302, Taiwan.
出版信息
Carbohydr Polym. 2022 Sep 1;291:119549. doi: 10.1016/j.carbpol.2022.119549. Epub 2022 Apr 30.
A variety of cellulose-based polymer composite materials has been developed and show different impacts on the morphologies and properties of composites. Herein, we report the morphologies and properties of composites by blending polyurethane (PU) with either ethyl cellulose (EC) or cellulose nanofiber (CNF) through either drop-casting or electrospinning process. EC is homogenously mixed with PU without microphase separation and enhanced Young's modulus of composites from 0.04 to 6.94 MPa. The CNF is heterogeneously distributed in PU/CNF composites without interference on the PU microstructure and slightly increased modulus to 0.24 MPa. While the shearing force of the electrospinning process slightly affects the PU/EC composites, it drastically enhances PU crystallinity and Young's modulus to 54.95 MPa in PU/CNF composites. A model is established to summarize the effect of cellulose additives, compositions, and processes on PU/cellulose composites, providing a comprehensive understanding for designing future cellulose composites.
已经开发出了多种基于纤维素的聚合物复合材料，它们对复合材料的形态和性能有不同的影响。在此，我们通过滴铸或静电纺丝工艺，将聚氨酯（PU）与乙基纤维素（EC）或纤维素纳米纤维（CNF）混合，报告了复合材料的形态和性能。EC 与 PU 均匀混合，没有微相分离，使复合材料的杨氏模量从 0.04 增加到 6.94 MPa。CNF 在 PU/CNF 复合材料中呈不均匀分布，对 PU 微观结构没有干扰，仅略微增加模量至 0.24 MPa。而静电纺丝过程中的剪切力对 PU/EC 复合材料略有影响，但却显著提高了 PU 的结晶度和杨氏模量，使 PU/CNF 复合材料的杨氏模量达到 54.95 MPa。建立了一个模型来总结纤维素添加剂、组成和工艺对 PU/纤维素复合材料的影响，为设计未来的纤维素复合材料提供了全面的认识。
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