两性表面活性剂/ 大分子聚集体形成机理研究

The aggaregates consisted of surfactants with same hydrophobic group and different hydrophilic group and macromolecules with different structure, such as polyvinylpyrrolidone (PVP) , polyacrylamide (HPAM) and xanthan(XC) have been investigated by means of fluorescence probing , surface tension, IR and computer simulation methods, and so on.The addition of XC and PVP resulted in a decrease of the aggregation number of dodecyldecyl betaine (C12BE) micelle. But there is a weaker interaction between LS-54 and PVP due to both molecules with weak positive charge. XC can decrease aggregation number of C12BE micelle and increase that of non-ionic surfactant LS-54, but there is no obvious effect on C11COONa. These disparities in properties should be due to the difference of the polar head group of the surfactants.The binding of dodecyl-oxypropyl-b-hydroxyl-trimethyl ammonium bromide (C12NBr) on different polyanions, such as hydrolysis polyacrylamide(HPAM), XC and hydrophobic modified polyccrylates (AMB) were investigated by using a potentiometric technique and surface tension measurements. The binding isotherms of C12NBr to HPAM and XC show cooperative characteristic, and the that of C12NBr to AMB and AMBA show a slow and continuous increase in binding amount as the increase of C12NBr concentration.

探索不同结构两性离子表面活性剂/ 大分子聚集体形成的热力学及动力学过程；探讨该类聚集体的形成机理及添加剂对其性能和形成条件的影响规律；揭示聚集体性能及微观结构与单体结构的关系。本研究对于丰富高分子溶液及胶体化学基础理论以及生物膜- 蛋字誓Ｄ饩哂兄匾庖澹杂谟吞锟ⅰ⑷沼没ぁ⒎闹菊裙ひ担哂欣砺壑傅技壑怠