Institute of Chemical Industry of Forest Products, Chinese Academy of Forestry; Key Laboratory of Biomass Energy and Material of Jiangsu Province; Key and Open Laboratory on Forest Chemical Engineering, State Forestry Administration; National Engineering Laboratory for Biomass Chemical Utilization, Nanjing 210042, China; Research Institute of New Technology, Chinese Academy of Forestry, Beijing 10091, China.
Institute of Chemical Industry of Forest Products, Chinese Academy of Forestry; Key Laboratory of Biomass Energy and Material of Jiangsu Province; Key and Open Laboratory on Forest Chemical Engineering, State Forestry Administration; National Engineering Laboratory for Biomass Chemical Utilization, Nanjing 210042, China.
Carbohydr Polym. 2014 May 25;105:207-13. doi: 10.1016/j.carbpol.2014.01.095. Epub 2014 Feb 5.
We prepared thermoset nancomposites from biomass-based two-component waterborne polyurethane (2K-WPU) and cellulose namowhiskers (CNWs). Due to the formation of hydrogen bonds, the viscosity of 2K-WPU dispersion was found to be increased with the addition of CNWs. SEM images showed "sea-island structure" corresponding to the microphase separation between CNWs nano-filler and the 2K-WPU matrix. The α-relaxation temperature (Tα) and glass transition temperature (Tg) increased with the increase of CNWs content, which was due to the formation of a rigid CNWs nano-phase acting as crosslinking points in the 2K-WPU matrix. Mechanical properties from tensile test showed Young's modulus and tensile strength of 2K-WPU/CNWs nanocomposites were reinforced by the addition of CNWs. Thermo-stability of 2K-WPU/CNWs nanocomposites decreased slightly with the increase of CNWs content, which could be attributed to the increased thermal conductivity of the material after adding CNWs.
我们制备了基于生物质的双组分水性聚氨酯（2K-WPU）和纤维素纳米晶须（CNWs）的热固性纳米复合材料。由于氢键的形成，发现 2K-WPU 分散体的粘度随着 CNWs 的加入而增加。SEM 图像显示出与 CNWs 纳米填料和 2K-WPU 基质之间的微相分离相对应的“海-岛结构”。α松弛温度（Tα）和玻璃化转变温度（Tg）随着 CNWs 含量的增加而增加，这是由于形成了刚性的 CNWs 纳米相，在 2K-WPU 基质中充当交联点。从拉伸试验得出的力学性能表明，添加 CNWs 增强了 2K-WPU/CNWs 纳米复合材料的杨氏模量和拉伸强度。随着 CNWs 含量的增加，2K-WPU/CNWs 纳米复合材料的热稳定性略有下降，这可能归因于添加 CNWs 后材料导热系数的增加。
