Zhou Chenxu, Ding Chao, Yang Huaguang, Huang Xianbo
National Engineering Laboratory for Plastic Modification and Processing, Kingfa Scientific and Technological Co., Ltd., Guangzhou 510275, China.
State Key Laboratory of Polymer Materials Engineering of China, College of Polymer Science and Engineering, Sichuan University, Chengdu 610065, China.
Polymers (Basel). 2024 Aug 8;16(16):2248. doi: 10.3390/polym16162248.
This study investigated the role of constructing a dual network in toughening bio-based long-chain polyamide 610 (PA610) composites. Rheological studies were conducted to reveal the effects of toughening agent type and content on the material properties. According to the variation trend of mechanical properties and the appearance of a rheological low-frequency plateau of the materials, the percolation network concentration of the toughening agent in the PA610 matrix was determined to be 13.5 vol.%. The interfacial interaction of the composite was evaluated through the percolation theory, and the scaling value = 1.36 for both indicated the good affinity between PA610 and the toughening agent. Rheology results found that the combination of ethylene terpolymer (PTW) and maleic anhydride-g-styrene-b-(ethylene-butylene)-b-styrene (MAH-SEBS) could achieve an optimal balance between the mechanical properties and fluidity of the composites. Furthermore, the addition of ultra-high-molecular-weight polytetrafluoroethylene (PTFE), in conjunction with the toughening agent, facilitated the construction of a dual semi-interpenetrating network. The strengthened intermolecular interactions restricted the relative slippage and mobility of the polymer chains and therefore enhanced the strength and toughness of the material. This study provides new possibilities and approaches for optimizing the comprehensive properties of bio-based polyamide materials.
本研究考察了构建双网络在增韧生物基长链聚酰胺610（PA610）复合材料中的作用。进行了流变学研究，以揭示增韧剂类型和含量对材料性能的影响。根据材料力学性能的变化趋势和流变学低频平台的出现，确定增韧剂在PA610基体中的逾渗网络浓度为13.5体积%。通过逾渗理论评估了复合材料的界面相互作用，两者的标度值均为1.36，表明PA610与增韧剂之间具有良好的亲和力。流变学结果表明，乙烯三元共聚物（PTW）和马来酸酐接枝苯乙烯-（乙烯-丁烯）-苯乙烯（MAH-SEBS）的组合可以在复合材料的力学性能和流动性之间实现最佳平衡。此外，添加超高分子量聚四氟乙烯（PTFE）并与增韧剂结合，有助于构建双半互穿网络。增强的分子间相互作用限制了聚合物链的相对滑移和流动性，从而提高了材料的强度和韧性。本研究为优化生物基聚酰胺材料的综合性能提供了新的可能性和途径。
