Highly Toughened and Transparent Biobased Epoxy Composites Reinforced with Cellulose Nanofibrils
Highly Toughened and Transparent Biobased Epoxy Composites Reinforced with Cellulose Nanofibrils
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DOI：
10.3390/polym11040612
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发表时间：
2019-04-01
期刊：
影响因子：
5
通讯作者：
Yan, Ning
中科院分区：
文献类型：
--
作者：
Nair, Sandeep S.;Dartiailh, Christopher;Yan, Ning
生物基纳米填料，如纤维素纳米纤丝（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，碳纳米纤维基复合材料与商业生物基环氧树脂的制备和表征，以确定形态，机械，热，和阻隔性能。向环氧树脂中添加18- 23wt%的CNF显着增加了所得复合材料的模量、强度和应变。原纤维的加入导致了应变能密度或韧性模量的整体增加了近184倍的复合材料相比，纯环氧树脂。CNF的加入不影响环氧树脂的高热稳定性。纳米纤维的存在下，在玻璃态和玻璃化转变区的复合材料有很强的增强效果。随着CNF的加入，环氧树脂基体的tan峰强度显著降低，表明在相变期间原纤维和环氧树脂之间存在高相互作用。高度结晶和高纵横比CNF（23重量%）的存在使纯环氧树脂的水蒸气渗透性降低超过50%。
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 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%.