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首页> 美国卫生研究院文献>Polymers >Highly Toughened and Transparent Biobased Epoxy Composites Reinforced with Cellulose Nanofibrils
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Highly Toughened and Transparent Biobased Epoxy Composites Reinforced with Cellulose Nanofibrils

机译：纤维素纳米纤维增强的高韧性透明生物基环氧复合材料

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摘要

Biobased nanofillers, such as cellulose nanofibrils (CNFs), have been widely used as reinforcing fillers for various polymers due to their high mechanical properties and potential for sustainable production. In this study, CNF-based composites with a commercial biobased epoxy resin were prepared and characterized to determine the morphology, mechanical, thermal, and barrier properties. The addition of 18–23 wt % of CNFs to epoxy significantly increased the modulus, strength and strain of the resulting composites. The addition of fibrils led to an overall increase in strain energy density or modulus of toughness by almost 184 times for the composites compared to the neat epoxy. The addition of CNFs did not affect the high thermal stability of epoxy. The presence of nanofibrils had a strong reinforcing effect in both glassy and glass transition region of the composites. A significant decrease in intensity in tan δ peak for the epoxy matrix occurred with the addition of CNFs, indicating a high interaction between fibrils and epoxy during the phase transition. The presence of highly crystalline and high aspect ratio CNFs (23 wt %) decreased the water vapour permeability of the neat epoxy resin by more than 50%.
机译：生物基纳米填料，例如纤维素纳米原纤维（CNF），由于其高机械性能和可持续生产的潜力，已被广泛用作各种聚合物的增强填料。在这项研究中，制备了具有商业生物基环氧树脂的CNF基复合材料，并对其进行了表征，以确定其形态，机械，热和阻隔性能。在环氧树脂中添加18-23 wt％的CNF会显着提高所得复合材料的模量，强度和应变。与纯环氧树脂相比，原纤维的添加使复合材料的应变能密度或韧性模量总体提高了近184倍。 CNF的添加不会影响环氧树脂的高热稳定性。纳米原纤维的存在在复合材料的玻璃态和玻璃态转变区域均具有强的增强作用。添加CNF后，环氧基质的tanδ峰强度显着降低，这表明在相变过程中原纤维和环氧之间的相互作用强。高结晶度和高长径比CNF（23 wt％）的存在使纯环氧树脂的水蒸气渗透率降低了50％以上。

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