新型剪切增稠胶的合成及其流变性能研究

Study on the synthesis and rheological properties of a novel shear thickening gel

从分子结构设计出发,以苯硼酸(PBA)与羟基封端的聚二甲基硅氧烷(PDMS-OH)为原料,通过缩聚反应制备了一种新型剪切增稠胶(PPBS)。通过傅里叶变换红外光谱仪和热重分析仪对材料的水解性和热稳定性进行表征,同时利用旋转流变仪对PPBS的线性粘弹区域、能量耗散能力及粘弹性进行研究。结果表明:PPBS具有更为优异的耐水解性和热稳定性,其最快分解温度和完全分解温度分别在466℃和568℃左右;通过Lissajous曲线中应力-应变曲线所包含的面积发现PPBS的能量耗散性能更优异;通过频率扫描发现其储能模量随着外界激励的增加增大5个数量级达到0.64MPa,材料表现出典型的剪切硬化性能,并且具有更为优异的相对剪切增稠效应。

Starting from molecular structure design,a novel shear thickening gel(PPBS)was prepared by polycondensation reaction using phenylboronic acid(PBA)and hydroxyl-terminated polydimethylsiloxane(PDMS-OH)as raw materials.The hydrolysis and thermal stability of the material were characterized by FT-IR and TG.At the same time,a rotational rheometer was used to study the linear viscoelastic region,energy dissipation capacity and viscoelastic properties of PPBS.The results showed that PPBS had better hydrolysis resistance and thermal stability,and its fastest decomposition temperature and complete decomposition temperature were about 466℃and 568℃,respectively.The energy dissipation performance of PPBS was found to be more excellent by the area contained in the stress-strain curve of the Lissajous curve.The frequency scan revealed that the energy storage modulus increased by 5 orders of magnitude to 0.64MPa with the increase of external excitation,and the material exhibited typical shear hardening performance and a more excellent relative shear thickening effect.