甲基丙烯酸长链酯基氢键缔合型减阻聚合物的合成工艺与流变行为研究

以K2S2O8-Na2SO3为氧化还原引发体系,采用乳液聚合方法合成了一种甲基丙烯酸长链酯基氢键缔合型减阻聚合物。研究了合成温度、氧化剂还原剂摩尔比与减阻率的关系,以及不同极性单体质量分数对剪切稳定性的影响;考察了温度、剪切速率、浓度及极性单体含量对该聚合物体系柴油溶液流变性能的影响。研究结果给出了在实验研究范围内,剪切稳定性最佳时的合成工艺条件;流变行为研究表明,氢键缔合型质子供体聚合物(D)和质子受体聚合物(A)的柴油溶液为典型符合幂律方程的假塑性流体,而两者1∶1混合后形成的氢键缔合型减阻聚合物的柴油溶液在γ.200 s-1时,其流变曲线与幂律方程出现了偏离;同时研究结果也表明,IPC的表观黏度随温度的变化、比浓黏度随浓度的变化规律都与其缔合前身有较大差异;最后对剪切速率与表观黏度的关系进行了实验探讨,得到了一种判断IPC减剪稳定性的可能的量度方法。

Synthesis technology and rheological behavior of hydrogen bonding mediated interpolymer complexes drag reducer based on long chain methacrylate

A new type of hydrogen bonding mediated interpolymer complexes based on long chain methacrylate were prepared by emulsion polymerization using K2S2O8-Na2SO3 as the redox initiator system. The effects of  synthesis temperature, the molar ratio of reductant to oxidant on drag reducing efficiency and  monomer composition on the shear stability of the complexes were studied.The influences of temperature, shearing rate, concentration and monomer composition of rheological properties of the interpolymer complexes diesel solution were also investigated. When the performance of shear stability was the best, the optimum synthesis technological conditions were obtained. Rheological studies showed that the  proton donor and proton acceptor polymers diesel solution fitted with the pseudo plastic fluid respectively, which accordded with the power-law equation. When γ^.<200s-1, the rheological curve of the interpolymer complexes deviated from the power-law equation. The results also showed that the variation of viscosity with temperature and concentration of the interpolymer complexes is apparently different from that of its association predecessor. Finally, a potential measurement of shear stability was obtained.