【摘要】 用1H谱,自旋-晶格弛豫时间(t1)和自旋-自旋弛豫时间(t2),gCOSY谱及二维核Overhause增强谱(2D NOESY)技术,研究了阳离子表面活性剂十六烷基三甲基溴化铵(CTAB)与水溶性聚合物聚乙烯醇(PVA)的相互作用。结果表明,当溶液中有CTAB存在时,PVA分子结构中的-CH质子的t1减小了0.8s,t2也从19.4ms降到17.5ms,即PVA分子链的运动受阻;随着PVA浓度的增加,当CTAB为2mmol/L时,CTAB分子的运动性下降,当CTAB为4mmol/L时,CTAB各质子的t1基本不变;从2D NOESY谱图中可以得出CTAB与PVA已经形成了复合物。更多还原

【Abstract】 Using nuclear magnetic resonance 1H,spin-lattice relaxation time(t1),spin-spin relaxation time(t2),gCOSY and 2D NOESY techniques,interaction between the cationic surfactant cetyltrimethyl ammonium bromide(CTAB) and water-soluble polymer polyvinyl alcohol(PVA) was studied.These results suggest that:(1) the translational mobility of PVA suffocates with the presence of surfactant CTAB.The t1 of P1 proton of PVA reduces 0.8 s,and t2 decreases from 19.4 ms to 17.5 ms;(2) the translational mobility of CTAB,which concentration is 2mmol/L,decreases with the increase in PVA concentration.And when the concentration of CTAB is 4 mmol/L,the variation of t1 of the proton of CTAB is not significant.(3) PVA and CTAB formed complex substance can be observed using the contour plot of 2D NOESY.更多还原