杂化聚氨酯基低阻尼材料的微观组织和力学性能

Microstructure and mechanical properties of hybrid polyurethane based low damping materials

聚醚型聚氨酯掺杂紫外线吸收剂THUV-328可以形成低阻尼复合材料。通过对材料的微观组织、力学性能及红外吸收光谱实验表明,小分子THUV-328与聚醚型聚氨酯热塑性弹性体(TPU)是物理混溶,在TPU中小分子无序、以棒状微粒形态存在。微观形貌分析表明,当THUV-328含量较低时,小分子能够较好地分散于基体内,基体TPU显示良好的连续完整性;当THUV-328含量较高时,体系的固溶平衡中THUV-328过饱和,小分子在脆断面的游离析出量增加;当THUV-328含量超过TPU含量时,基体平面连续性被破坏,脆断面缺陷处小分子聚集量增加,此时THUV-328起到类纤维增强体作用。复合材料的抗张强度和断裂伸长率实验表明,THUV-328在复合体系中的增塑和类纤维增强体作用相互竞争,竞争结果不同将导致材料表现出的力学效果不同。

Low damping composites can be synthesized by doping polyether polyurethane with UV absorbers THUV-328.The microstructure,mechanical properties and infrared absorption spectra of the material showed that the small molecule THUV-328 was physically miscible with polyether polyurethane TPU,and the small molecule in TPU was disordered and existed in the form of rod-like particles.Microscopic morphology analysis showed that the small molecules were better dispersed in the matrix,which indicated good continuous integrity when the content of THUV-328 was low.In addition,the solution equilibrium of THUV-328 was supersaturated and the free precipitation of small molecules in the brittle section was increased when the content of THUV-328 was high.Meanwhile,the plane continuity of the matrix was destroyed and the aggregation amount of small molecules at the brittle section defect was increased when the addition amount of THUV-328 overed the TPU content,implying that THUV-328 played a role as fiber-like reinforcer.The tensile strength and elongation at break experiments of composite materials showed that the plasticizing and fiber-like reinforcement of THUV-328 in the composite system competed with each other,and different competition results leaded to different mechanical effects of the materials.