Yan Yutao, Herzele Sabine, Mahendran Arunjunai Raj, Edler Matthias, Griesser Thomas, Saake Bodo, Li Jianzhang, Gindl-Altmutter Wolfgang
Ministry of Education Key Laboratory of Wooden Material Science and Application, Beijing Key Laboratory of Wood Science and Engineering, MOE Engineering Research Centre of Forestry Biomass Materials and Bioenergy, Beijing Forestry University, Beijing 100083, China.
Kompetenzzentrum Holz GmbH, Altenbergerstrasse 69, A-4040 Linz, Austria.
Polymers (Basel). 2016 Jul 11;8(7):255. doi: 10.3390/polym8070255.
A new route towards embedding fibrillated cellulose in a non-polar thermoset matrix without any use of organic solvent or chemical surface modification is presented. It is shown that microfibrillated lignocellulose made from cellulose with high residual lignin content is capable of stabilising an emulsion of unsaturated polyester resin in water due to its amphiphilic surface-chemical character. Upon polymerisation of the resin, thermoset microspheres embedded in a microfibrillated cellulose network are formed. The porous network structure persists after conventional drying in an oven, yielding a mechanically stable porous material. In an application experiment, the porous material was milled into a fine powder and added to the polyester matrix of a glass fibre-reinforced composite. This resulted in a significant improvement in fracture toughness of the composite, whereas a reduction of bending strength and stiffness was observed in parallel.
本文提出了一种在不使用任何有机溶剂或进行化学表面改性的情况下，将原纤化纤维素嵌入非极性热固性基体的新方法。研究表明，由具有高残留木质素含量的纤维素制成的微纤化木质纤维素，由于其两亲性表面化学特性，能够稳定不饱和聚酯树脂在水中的乳液。树脂聚合后，形成了嵌入微纤化纤维素网络中的热固性微球。在烘箱中进行常规干燥后，多孔网络结构得以保留，从而得到一种机械稳定的多孔材料。在应用实验中，将该多孔材料研磨成细粉并添加到玻璃纤维增强复合材料的聚酯基体中。这使得复合材料的断裂韧性得到显著提高，与此同时，弯曲强度和刚度有所降低。
