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Injectable Highly Loaded Cellulose Nanocrystal Fibers and Composites
ACS Macro Letters ( IF 5.1 ) Pub Date : 2017-09-14 00:00:00 , DOI: 10.1021/acsmacrolett.7b00609 Nandula D Wanasekara 1 , Stephen J Eichhorn 1
ACS Macro Letters ( IF 5.1 ) Pub Date : 2017-09-14 00:00:00 , DOI: 10.1021/acsmacrolett.7b00609 Nandula D Wanasekara 1 , Stephen J Eichhorn 1
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Cellulose nanocrystals (CNC)/poly(ethylene oxide) (PEO) composite fibers were successfully produced in situ by injection into a hydrophobic solvent. Using a similar principle, a single step manufacturing method of injectable composites was developed by injection of a CNC solution into a hydrophobic resin. Molecular orientation and deformation of the fibers and composites were obtained using Raman spectroscopy. CNCs were found to be highly aligned along the fiber’s axes, as confirmed by 2-fold symmetry of polar plots and second and fourth order orientation parameters. A shift in the position of a characteristic Raman band, initially located at ∼1095 cm–1, corresponding to vibrations of the cellulose backbone polymer chains was followed under tensile deformation. Using this shift, it was possible to estimate the fiber modulus as being ∼33 GPa, which is remarkably high. Stress transfer between the hydrophobic resin and the injected CNC fibers was quantified in this new type of composite using a modified shear-lag theory showing that appreciable reinforcement occurs. Our approach presents a new way to introduce highly loaded CNC fibers in situ into a composite structure.
中文翻译：
可注射的高负载纤维素纳米晶体纤维和复合材料
纤维素纳米晶体 (CNC)/聚 (环氧乙烷) (PEO) 复合纤维通过注入疏水溶剂原位成功生产。使用类似的原理，通过将 CNC 溶液注入疏水树脂中，开发了一种可注射复合材料的单步制造方法。使用拉曼光谱获得纤维和复合材料的分子取向和变形。发现 CNC 沿纤维轴高度对齐，这通过极坐标图的 2 倍对称性和二阶和四阶取向参数得到证实。特征拉曼谱带位置的偏移，最初位于 ∼1095 cm -1，对应于纤维素主链聚合物链的振动，在拉伸变形下跟随。使用这种转变，可以估计纤维模量为~33 GPa，这是非常高的。在这种新型复合材料中，疏水性树脂和注入的 CNC 纤维之间的应力传递使用改进的剪切滞后理论进行了量化，表明发生了明显的增强作用。我们的方法提出了一种将高负载 CNC 纤维原位引入复合结构的新方法。
更新日期：2017-09-14
中文翻译：
可注射的高负载纤维素纳米晶体纤维和复合材料
纤维素纳米晶体 (CNC)/聚 (环氧乙烷) (PEO) 复合纤维通过注入疏水溶剂原位成功生产。使用类似的原理，通过将 CNC 溶液注入疏水树脂中，开发了一种可注射复合材料的单步制造方法。使用拉曼光谱获得纤维和复合材料的分子取向和变形。发现 CNC 沿纤维轴高度对齐，这通过极坐标图的 2 倍对称性和二阶和四阶取向参数得到证实。特征拉曼谱带位置的偏移，最初位于 ∼1095 cm -1，对应于纤维素主链聚合物链的振动，在拉伸变形下跟随。使用这种转变，可以估计纤维模量为~33 GPa，这是非常高的。在这种新型复合材料中，疏水性树脂和注入的 CNC 纤维之间的应力传递使用改进的剪切滞后理论进行了量化，表明发生了明显的增强作用。我们的方法提出了一种将高负载 CNC 纤维原位引入复合结构的新方法。
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