A series of poly(N-isopropylacrylamide-co-methacryloyloxyethyl dimethyloctyl ammonium bromide) [P (NIPAM-co-ADMOAB)] hydrogels were prepared.The influences of the amount of ADMOAB in copolymeric gels on the swelling b...A series of poly(N-isopropylacrylamide-co-methacryloyloxyethyl dimethyloctyl ammonium bromide) [P (NIPAM-co-ADMOAB)] hydrogels were prepared.The influences of the amount of ADMOAB in copolymeric gels on the swelling behavior were investigated.The deswelling and reswelling kinetics were also studied.Results showed that the equilibrium swelling ratios (ESRs) of copolymeric gels increased with the enhanced ADMOAB content in the composition at temperatures below LCST,and the maximum ESR was 126 compared with a value of 28 for homopolymeric gel P(NIPAM),and the ESR for all copolymeric gels tended to zero independent of the composition when the temperature was above LCST.The rate constants in deswelling process increased at first and then decreased with increasing the ADMOAB amount,and the final water retention for copolymeric gels(about 1%) was much lower than that of P(NIPAM)(20%).The swelling ratios during reswelling process increased with the ADMOAB amount,and the diffusion of water into P(NIPAM-co-ADMOAB) gels was found to be a non-Fickian mode.Though decreased in saline solutions,swelling ratios for copolymeric gels were not significantly influenced by ionic strength with NaCl concentration from 0.1 to 0.3 mol/L and higher than those of homopolymeric gels in deionized water with the same swelling time.P(NIPAM-co-ADMOAB) hydrogels can be expected as good candidates for controlled drug delivery systems and separation processes.展开更多
对4种二烯丙基甲基烷基（n=12,14,16,18）溴化铵（标记为C12,C14,C16,C18）的性质与性能进行了研究。通过测定其热稳定性、表面活性和絮凝性能,考察产物结构对其性质与性能的影响规律。结果表明,季铵盐C12~C18的主要分解温度分别为170~...对4种二烯丙基甲基烷基（n=12,14,16,18）溴化铵（标记为C12,C14,C16,C18）的性质与性能进行了研究。通过测定其热稳定性、表面活性和絮凝性能,考察产物结构对其性质与性能的影响规律。结果表明,季铵盐C12~C18的主要分解温度分别为170~300℃、172~303℃、170~293℃和170~310℃,对应失重率分别为92.8%、92.6%、96.4%和87.4%;临界胶束浓度（cmc）和临界胶束浓度下的表面张力（γcmc）分别为5.2、3.5、1.4、1.1 mmol/L和26.6、25.2、33.8、35.8 m N/m,显示出较高的表面活性;季铵盐C16的发泡与稳泡性能最好,C12的Krafft点〈0℃,C14、C16和C18的Krafft点分别为1、8和19℃;C12和C14分别对膨润土和高岭土的絮凝能力最强,表明单体的絮凝性能具有结构选择性。展开更多
Two novel reactive monomers 2,4 bis(2 allyl phenoxy) 6 N,N dialkylamino 1,3,5 triazine (alkyl=methyl, ethyl) were synthesized in one pot reaction of cyanuric chloride, 2 allyl phenol with dialkylamine in acetone/water...Two novel reactive monomers 2,4 bis(2 allyl phenoxy) 6 N,N dialkylamino 1,3,5 triazine (alkyl=methyl, ethyl) were synthesized in one pot reaction of cyanuric chloride, 2 allyl phenol with dialkylamine in acetone/water in the presence of aq. NaOH. The products have been characterized by FTIR, 1H NMR, 13 C NMR and elemental analysis.展开更多
以烯丙基二甲基胺（ADMA）和1-溴代直链烷为原料,合成了2种不同碳链长度（n=16,18）的烯丙基二甲基烷基溴化铵（C16和C18）,得到较佳的合成工艺条件为以丙酮作溶剂,ADMA与溴代烷的摩尔比为1∶1.1~1.2,65℃下反应60 h,所得产品的收率分别...以烯丙基二甲基胺（ADMA）和1-溴代直链烷为原料,合成了2种不同碳链长度（n=16,18）的烯丙基二甲基烷基溴化铵（C16和C18）,得到较佳的合成工艺条件为以丙酮作溶剂,ADMA与溴代烷的摩尔比为1∶1.1~1.2,65℃下反应60 h,所得产品的收率分别为68.20%和66.05%。用IR,1HNMR和元素分析对产品结构进行了表征,并测定了产品的表面活性、水溶性、泡沫性能、乳化性及絮凝性。结果表明,C16和C18的临界胶束浓度分别为5.5×10-4和1.8×10-4mol/L,相应的表面张力分别为33.5和32.4 m N/m,产品具有良好的表面活性;C16和C18的Krafft点分别为8和21℃;与十二烷基硫酸钠（SDS）相比,产品的乳化能力较弱;C16的发泡能力以及对高岭土的絮凝能力明显强于C18。展开更多
文摘A series of poly(N-isopropylacrylamide-co-methacryloyloxyethyl dimethyloctyl ammonium bromide) [P (NIPAM-co-ADMOAB)] hydrogels were prepared.The influences of the amount of ADMOAB in copolymeric gels on the swelling behavior were investigated.The deswelling and reswelling kinetics were also studied.Results showed that the equilibrium swelling ratios (ESRs) of copolymeric gels increased with the enhanced ADMOAB content in the composition at temperatures below LCST,and the maximum ESR was 126 compared with a value of 28 for homopolymeric gel P(NIPAM),and the ESR for all copolymeric gels tended to zero independent of the composition when the temperature was above LCST.The rate constants in deswelling process increased at first and then decreased with increasing the ADMOAB amount,and the final water retention for copolymeric gels(about 1%) was much lower than that of P(NIPAM)(20%).The swelling ratios during reswelling process increased with the ADMOAB amount,and the diffusion of water into P(NIPAM-co-ADMOAB) gels was found to be a non-Fickian mode.Though decreased in saline solutions,swelling ratios for copolymeric gels were not significantly influenced by ionic strength with NaCl concentration from 0.1 to 0.3 mol/L and higher than those of homopolymeric gels in deionized water with the same swelling time.P(NIPAM-co-ADMOAB) hydrogels can be expected as good candidates for controlled drug delivery systems and separation processes.
文摘对4种二烯丙基甲基烷基（n=12,14,16,18）溴化铵（标记为C12,C14,C16,C18）的性质与性能进行了研究。通过测定其热稳定性、表面活性和絮凝性能,考察产物结构对其性质与性能的影响规律。结果表明,季铵盐C12~C18的主要分解温度分别为170~300℃、172~303℃、170~293℃和170~310℃,对应失重率分别为92.8%、92.6%、96.4%和87.4%;临界胶束浓度（cmc）和临界胶束浓度下的表面张力（γcmc）分别为5.2、3.5、1.4、1.1 mmol/L和26.6、25.2、33.8、35.8 m N/m,显示出较高的表面活性;季铵盐C16的发泡与稳泡性能最好,C12的Krafft点〈0℃,C14、C16和C18的Krafft点分别为1、8和19℃;C12和C14分别对膨润土和高岭土的絮凝能力最强,表明单体的絮凝性能具有结构选择性。
文摘Two novel reactive monomers 2,4 bis(2 allyl phenoxy) 6 N,N dialkylamino 1,3,5 triazine (alkyl=methyl, ethyl) were synthesized in one pot reaction of cyanuric chloride, 2 allyl phenol with dialkylamine in acetone/water in the presence of aq. NaOH. The products have been characterized by FTIR, 1H NMR, 13 C NMR and elemental analysis.
文摘以烯丙基二甲基胺（ADMA）和1-溴代直链烷为原料,合成了2种不同碳链长度（n=16,18）的烯丙基二甲基烷基溴化铵（C16和C18）,得到较佳的合成工艺条件为以丙酮作溶剂,ADMA与溴代烷的摩尔比为1∶1.1~1.2,65℃下反应60 h,所得产品的收率分别为68.20%和66.05%。用IR,1HNMR和元素分析对产品结构进行了表征,并测定了产品的表面活性、水溶性、泡沫性能、乳化性及絮凝性。结果表明,C16和C18的临界胶束浓度分别为5.5×10-4和1.8×10-4mol/L,相应的表面张力分别为33.5和32.4 m N/m,产品具有良好的表面活性;C16和C18的Krafft点分别为8和21℃;与十二烷基硫酸钠（SDS）相比,产品的乳化能力较弱;C16的发泡能力以及对高岭土的絮凝能力明显强于C18。
