Materials+Technologies Group, Department of Chemical and Environmental Engineering, Polytechnic School, University of Basque Country, Pza. Europa 1, 20018 Donostia-San Sebastián, Spain.
Carbohydr Polym. 2013 Jan 30;92(1):751-7. doi: 10.1016/j.carbpol.2012.09.093. Epub 2012 Oct 9.
Cellulose nanocrystals (CNC) successfully obtained from microcrystalline cellulose (MCC) were dispersed in a thermoplastic polyurethane as matrix. Nanocomposites containing 1.5, 5, 10 and 30 wt% CNC were prepared by solvent casting procedure and properties of the resulting films were evaluated from the viewpoint of polyurethane microphase separated structure, soft and hard domains. CNC were effectively dispersed in the segmented thermoplastic elastomeric polyurethane (STPUE) matrix due to the favorable matrix-nanocrystals interactions through hydrogen bonding. Cellulose nanocrystals interacted with both soft and hard segments, enhancing stiffness and stability versus temperature of the nanocomposites. Thermal and mechanical properties of STPUE/CNC nanocomposites have been associated to the generated morphologies investigated by AFM images.
成功地从微晶纤维素 (MCC) 中获得的纤维素纳米晶体 (CNC) 被分散在热塑性聚氨酯中作为基体。通过溶剂浇铸法制备了含有 1.5、5、10 和 30wt% CNC 的纳米复合材料，并从聚氨酯微相分离结构、软段和硬段的角度评估了所得薄膜的性能。由于通过氢键实现了有利的基体-纳米晶体相互作用，CNC 能够有效地分散在分段热塑性弹性体聚氨酯 (STPUE) 基体中。纤维素纳米晶体与软段和硬段相互作用，提高了纳米复合材料的刚性和温度稳定性。通过 AFM 图像研究了所产生的形态，将 STPUE/CNC 纳米复合材料的热性能和机械性能与它们相关联。
