聚苯乙烯微球对疏水缔合聚合物溶液流变性能的影响

Effect of Polystyrene Microsphere on the Rheology of Hydrophobic Associating Polymer Solution

为揭示疏水微球对疏水缔合聚合物流变性能的影响规律,以苯乙烯为单体,通过自由基共聚制得单分散的聚苯乙烯微球(PSM),并与疏水缔合聚合物(HAP)配成溶液。用环境扫描电子显微镜研究了PSM对HAP溶液微观结构的影响,用旋转黏度计和流变仪等考察了PSM/HAP溶液的表观黏度、剪切稀释行为和黏弹性。结果表明,PSM呈球状,粒径约1μm,且分布较窄;HAP加量超过其临界缔合浓度(2 g/L)时,HAP在水溶液中形成网状结构的主要方式为链间缔合。PSM加入HAP溶液后,PSM散布在较粗的HAP链束表面,且PSM团聚程度随PSM浓度增大而快速上升。PSM可适当提高HAP溶液的表观黏度和抗剪切性能,并改善其黏弹性。当HAP网状结构处于"破坏-恢复"的动态平衡时,PSM可作为物理交联点与HAP疏水基团作用,对网状结构的恢复有利。

In order to reveal the influence of hydrophobic microspheres on the rheology of hydrophobic associating polymer, monodispersed polystyrene microspheres(PSM)were synthesized via free radical copolymerization with styrene monomers and were dissolved in water with hydrophobic associating polymer(HAP). Environmental scanning electron microscope was used to study the effect of PSM on the microstructure of HAP solution,and rotary viscometer and rheometer were used to investigate the apparent viscosity,viscoelastic behavior and shear thinning of PSM/HAP solutions. The results showed that granular PSM had a narrow size distribution,with an average diameter about 1 μm. When the dosage of HAP exceeded its critical association concentration(2 g/L),the main way for HAP to form a network structure in aqueous solution was inter-chain association. When PSM were added to HAP solution,PSM dispersed in the surface of thicker HAP chains,and the agglomeration inclination of PSM increased rapidly as the concentration of PSM increased. PSM could appropriately improve the apparent viscosity and shear resistance and contribute to the viscoelasticity of HAP solution. When the HAP network structure was in the dynamic equilibrium of "breakup-recovery",PSM,as the physical cross-link points,interacted with the hydrophobic groups of HAP,which was beneficial to the recovery of network structure.