Faculty of Sciences and Technologies, Laboratory of Organometallic and Macromolecular Chemistry-Composite Materials, Cadi Ayyad University, Avenue Abdelkrim Elkhattabi, B.P. 549, Marrakech 40000, Morocco; Univ. Grenoble Alpes, LGP2, F-38000 Grenoble, France; CNRS, LGP2, F-38000 Grenoble, France.
Faculty of Sciences and Technologies, Laboratory of Organometallic and Macromolecular Chemistry-Composite Materials, Cadi Ayyad University, Avenue Abdelkrim Elkhattabi, B.P. 549, Marrakech 40000, Morocco.
Carbohydr Polym. 2015 May 20;122:202-11. doi: 10.1016/j.carbpol.2014.12.081. Epub 2015 Jan 14.
Novel bio-based polyurethane (PU) nanocomposites composed of cellulose nanofiller extracted from the rachis of date palm tree and polycaprolactone (PCL) diol based PU were prepared by casting/evaporation. Two types of nanofiber were used: cellulose nanofibrils (CNFs) and cellulose nanocrystals (CNCs). The mechanical and thermal properties of the nanocomposite films were studied by DMA, DSC, and tensile tests and the morphology was investigated by SEM. Bionanocomposites presented good mechanical properties in comparison to neat PU. While comparing both nanofillers, the improvement in mechanical and thermal properties was more pronounced for the nanocomposites based on CNF which could be explained, not only by the higher aspect ratio of CNF, but also by their better dispersion in the PU matrix. Calculation of the solubility parameters of the nanofiller surface polymers and of the PU segments portend a better interfacial adhesion for CNF based nanocomposites compared to CNC.
采用浇注/蒸发法制备了由从枣椰树叶柄中提取的纤维素纳米纤维和基于聚己内酯二醇的聚氨酯（PU）组成的新型生物基 PU 纳米复合材料。使用了两种类型的纳米纤维：纤维素纳米纤维（CNFs）和纤维素纳米晶体（CNCs）。通过 DMA、DSC 和拉伸试验研究了纳米复合材料薄膜的力学和热性能，通过 SEM 研究了其形态。与纯 PU 相比，生物纳米复合材料具有良好的力学性能。在比较两种纳米填料时，基于 CNF 的纳米复合材料的力学和热性能的改善更为明显，这不仅可以归因于 CNF 的更高纵横比，还可以归因于其在 PU 基体中的更好分散。纳米填料表面聚合物和 PU 段的溶解度参数的计算预示着基于 CNF 的纳米复合材料具有比 CNC 更好的界面附着力。
