疏水基含量和微嵌段长度对缔合聚合物溶液弹性的影响

摘要

The effects of hydrophobic group content and micro-block length on viscoelastic properties of P(AM-NaAA-C16 DMAAC) (AA:acrylamide,NaAA:sodium acrylate,C16 DMAAC:hexadecyl trimethyl allylammonium chloride) solution were studied.The results indicated that the viscoelastic properties could be changed effectively for associative polymers with similar molecular structure and common zero shear viscosity by varying the molecular structures.When increasing the hydrophobic group content,the first normal stress difference(N1) increased and its shearing rate,a speed for N1 to reach the minimum value decreased.Furthermore,when increasing the micro-block length,the viscosities and the viscoelatic rheological properties decreased after initial increasing,so there is an optimum value for the micro-block length.%研究了疏水基含量和微嵌段长度对缔合聚合物,聚(丙烯酰胺-丙烯酸钠-十六烷基二甲基烯丙基氯化铵)[P(AM-NaAA-C16DMAAC)],弹性行为的影响规律.研究结果表明,对于结构类似且具有相近零剪切粘度的缔合聚合物,疏水基含量越高,聚合物分子链间形成稠密网络结构的疏水缔合能力越强,其第一法向应力差N1越大,N1出现拐点处对应剪切速率越小,缔合聚合物溶液弹性越好；并且缔合聚合物溶液的弹性随着疏水微嵌段长度的增加先增加后降低,存在最佳微嵌段长度.因此,可以通过调整分子结构有效改变缔合聚合物溶液的弹性行为.