College of Chemical Engineering, Wuhan University of Technology, Wuhan 430070, China.
Carbohydr Polym. 2013 Jun 5;95(1):91-9. doi: 10.1016/j.carbpol.2013.02.023. Epub 2013 Mar 5.
New nanocomposites consisting of a castor oil-based polyurethane matrix filled with acetylated cellulose nanocrystals (ACNs) were developed. The ACN exhibited improved dispersion in tetrahydrofuran as a blending medium, and reduced polarity as compared with unmodified cellulose nanocrystals, resulting in a high loading level of 25 wt% in the nanocomposite. As the ACN loading-level increased from 0% to 25%, the tensile strength and Young's modulus of the nanocomposites increased from 2.79 MPa to 10.41 MPa and from 0.98 MPa to 42.61 MPa, respectively. When the ACN loading-level was 10 wt%, the breaking elongation of the nanocomposites reached the maximum value of more than twice that of the polyurethane. The enhanced mechanical performance was primarily attributed to the formation of a three-dimensional ACN network and strong interfacial interactions between filler and matrix. This work produced new polyurethane-based nanocomposites containing modified cellulose nanocrystal with a high biomass content. Its high performance could contribute to potential applications.
研制了一种新型纳米复合材料，由蓖麻油基聚氨酯基质填充乙酰化纤维素纳米晶体（ACN）组成。与未改性的纤维素纳米晶体相比，ACN 在作为混合介质的四氢呋喃中表现出更好的分散性，并且极性降低，导致纳米复合材料的高负载水平为 25wt%。随着 ACN 负载水平从 0%增加到 25%，纳米复合材料的拉伸强度和杨氏模量分别从 2.79MPa 增加到 10.41MPa 和从 0.98MPa 增加到 42.61MPa。当 ACN 负载水平为 10wt%时，纳米复合材料的断裂伸长率达到了超过两倍于聚氨酯的最大值。机械性能的提高主要归因于形成了三维 ACN 网络和填充剂与基质之间的强界面相互作用。这项工作生产了含有高生物质含量的改性纤维素纳米晶体的新型基于聚氨酯的纳米复合材料。其高性能可能有助于潜在的应用。
