School of Chemistry and Chemical Engineering, Guangdong Engineering Research Center for Green Fine Chemicals, South China University of Technology, Wushan Road 381, Guangzhou, Guangdong 510640, China.
School of Chemistry and Chemical Engineering, Guangdong Engineering Research Center for Green Fine Chemicals, South China University of Technology, Wushan Road 381, Guangzhou, Guangdong 510640, China.
Int J Biol Macromol. 2021 Jun 1;180:523-532. doi: 10.1016/j.ijbiomac.2021.03.091. Epub 2021 Mar 19.
Nano silica (SiO) is usually used as a common reinforcing agent in polymer materials, in which the interfacial interaction greatly affects the mechanical properties of the composites. The reinforcement effect of silica on non-polar polymer is restricted due to their poor compatibility. In this work, amphipathic lignin modified by quaternization and alkylation was used as a modifier for silica to prepare hydrophobic lignin/SiO nanoparticles by in-situ one-pot co-precipitation method. In alkaline solution, hydrophobic lignin and SiO (from NaSiO) were self-assembled to form nanospheres through electrostatic and hydrophobic interactions. The results showed that the lignin/SiO nanoparticles were highly hydrophobic nanospheres with macropores in the surface. When the lignin/SiO nanoparticles (10 wt%) were added to reinforce high-density polyethylene (HDPE), the mechanical properties of HDPE were improved with the strength of 24.5 MPa and the elongation of 1096%, which were increased by 10.4% and 14.3% compared with the control HDPE, because of the good compatibility and large bonding area. This work puts forward a new solution for the application of lignin in reinforcement of non-polar polymers.
纳米二氧化硅（SiO）通常用作聚合物材料中的常见增强剂，其中界面相互作用极大地影响复合材料的机械性能。由于其相容性差，SiO 对非极性聚合物的增强作用受到限制。在这项工作中，采用季铵化和烷基化改性的两亲性木质素作为 SiO 的改性剂，通过原位一锅共沉淀法制备疏水性木质素/SiO 纳米粒子。在碱性溶液中，疏水性木质素和 SiO（来自 NaSiO）通过静电和疏水相互作用自组装形成纳米球。结果表明，木质素/SiO 纳米粒子是具有表面大孔的高度疏水性纳米球。当木质素/SiO 纳米粒子（10wt%）添加到增强高密度聚乙烯（HDPE）中时，HDPE 的机械性能得到提高，强度为 24.5MPa，伸长率为 1096%，与对照 HDPE 相比，分别提高了 10.4%和 14.3%，这是由于其良好的相容性和较大的结合面积。这项工作为木质素在非极性聚合物增强中的应用提出了新的解决方案。
