超声波在聚合物溶液中的衰减特性研究

Study on attenuation characteristics of ultrasonic wave in polymer solution

研究了超声波在不同浓度、结构的5种聚合物溶液(阴、阳离子聚丙烯酰胺(APAM,CPAM)、聚丙烯酸钠(PAAS)、羧甲基纤维素钠(CMC)、海藻酸钠(SA)中的声衰减系数变化,发现聚合物溶液黏度与声衰减并不呈现完全正相关关系,声衰减还与聚合物溶液中的胶束有关:阳离子聚丙烯酰胺(CPAM)溶液黏度仅增加0.83 mPa·s,胶束的存在使得声衰减系数增大124.48%。进一步地,将聚合物溶液加入到不同浓度的NaCl溶液中,改变聚合物溶液中胶束的形态,发现只有当胶束达到一定尺寸时,才会对声衰减造成影响。

Changes of ultrasonic attenuation coefficient in five kinds of polymer solutions,anionic and cationic polyacrylamide(APAM and CPAM),sodium polyacrylate(PAAS),sodium carboxymethyl cellulose(CMC)and sodium alginate(SA),with different concentration and structure are studied.It is found that the viscosity of polymer solution is not perfectly in positive correlation with acoustic attenuation,and the acoustic attenuation is also related to micelles in polymer solution:the viscosity of CPAM solution only increased by 0.83mPa·s,and the micelles in CPAM solution increased the acoustic attenuation coefficient by 124.48%.Furthermore,the polymer solution is added to different concentrations of NaCl solution to change the morphology of micelles,and the results show that acoustic attenuation can be affected only when the micelles reach a certain size.