酚醛树脂冻胶流变性及粘弹性研究

RHEOLOGICAL BEHAVIORS AND VISCOELASTICITY OF PHENOLIC RESIN GEL

由疏水缔合聚合物AP–P4和酚醛树脂预聚体YG103交联得到了酚醛树脂冻胶,研究了酚醛树脂冻胶的流变性和粘弹性,并对疏水缔合聚合物和酚醛树脂冻胶的粘弹性进行了对比。研究表明,酚醛树脂冻胶成胶过程可分为缓慢诱导阶段、快速增长阶段和稳定阶段。酚醛树脂冻胶的剪切应力具有时间依赖性和滞后特性,在外力作用一段时间后冻胶的应变可较好地恢复。与聚合物溶液相比,酚醛树脂冻胶具有更宽的线性粘弹性区域和更高的储能模量和损耗模量。在低频率下该冻胶的储能模量比损耗模量大,随着频率的增加,储能模量和损耗模量均增加;随着聚合物和交联剂质量分数的增加,冻胶体系的储能模量和损耗模量均增加;随着矿化度的增加,冻胶体系的储能模量和损耗模量出现先降低—增加—降低的过程。

Phenolic resin gel which comprises hydrophobically associating polymer AP-P4 and crosslinker of phenolicresin YG103 is studied in its rheological behaviors and viscoelasticity characteristics,and the viscoelasticitiesbetween the phenolic resin gel and hydrophobically associating polymer are compared.The experiments indicatedthat the gelation procedure of the phenolic resin gel could be divided into three periods: the slowing inductionperiod,the increasing gelation stage,and the stabilization stage.The shear stress of phenolic resin gel depend onstress time and is hysteretic,and its strain could be better restored under the external force in a certain time.Thephenolic resin gel has not only broader linear viscoelasticity area but also higher storage modulus and loss modulusthan polymer solution.The storage modulus of the gel is higher than the loss modulus under low frequency,andNo.3 Abstract XVthe storage modulus and loss modulus could both increase in circumstance of increasing frequency or increasing thepercentage of corsslinker and polymer.But the storage modulus and loss modulus of gel system has a process ofdecreasing—increasing—decreasing with salinity increasing.