Due to the poor salt tolerance and heat resistance of the partially hydrolyzed acryl amide in the reservoir of high temperature and high inorganic salt,and the poor ability of shear,the hydrophobically associating ter...Due to the poor salt tolerance and heat resistance of the partially hydrolyzed acryl amide in the reservoir of high temperature and high inorganic salt,and the poor ability of shear,the hydrophobically associating terpolymers acrylamide\|hexadecyl ally ammonium chloride\|2\|acrylamino\|2\|metyl propane sulfuric acid (AM\|C 16 DMAAC\|AMPS) is prepared by micelle polymerization with the nonionic monomer\|AM,the anionic monomer\|AMPS,the cationic monomer\|C 16 DMAAC,It is investigated that the effect of the content of the hydrophobic monomer,anionic monomer,cationic monomer,reaction temperature and the concentration of the inorganic salt and the surfactant on the viscosity of the hydrophobically associating aqueous soluble terpolymers in brine.The results show that the aqueous soluble hydrophobically associating terpolymers(1000?mg/L) have good viscofication effect in brine(20000?mg/L),when the content of the hydrophobic monomer is 1\^2%,and of the anionic monomer is 30%,the hydrophobically associating terpolymers can meet the need of polymer flooding in reservoir of the high concentration inorganic salt.展开更多
采用γ-射线辐照法,以壳聚糖、丙烯酰胺(AM)和二甲基二烯丙基氯化铵(DMDAAC)为原料制备了壳聚糖-AM-DMDAAC接枝共聚物。考察了吸收剂量、单体AM与DMDAAC重量比、壳聚糖与总单体重量比、反应物浓度等因素对接枝共聚反应的影响。结果表明...采用γ-射线辐照法,以壳聚糖、丙烯酰胺(AM)和二甲基二烯丙基氯化铵(DMDAAC)为原料制备了壳聚糖-AM-DMDAAC接枝共聚物。考察了吸收剂量、单体AM与DMDAAC重量比、壳聚糖与总单体重量比、反应物浓度等因素对接枝共聚反应的影响。结果表明,随着吸收剂量的增大,接枝率和阳离子度上升,而接枝效率变化不大,吸收剂量为4 k Gy时最佳,接枝率、接枝效率和阳离子度分别为210.9%、96.1%和26.9%;接枝率和接枝效率随着AM与DMDAAC重量比的增加而提高,当AM与DMDAAC重量比为7:3时达到最大值,分别为182.6%和98.8%;随着壳聚糖与总单体重量比的降低,接枝率、接枝效率和阳离子度逐渐增加,当壳聚糖与总单体重量比为3:8时,其值分别为182.5%、94.9%和25.5%,接枝效果最好;接枝率、接枝效率和阳离子度随着反应物浓度的降低先上升后降低,醋酸最佳用量为100 m L。展开更多
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
文摘通过光化学合成方法分别在高温(50℃)和室温(28℃)下实现了N,N-二甲基丙烯酰胺(DMAA)和N-异丙基丙烯酰胺(NIPAm)的交联共聚,制备了两种不同结构的P(DMAA-co-NIPAm)共聚物水凝胶.对两种温度下制备的P(DMAA-co-NIPAm)共聚物水凝胶的网络结构、溶胀与消溶胀速率和温度敏感性等方面进行了比较研究.结果发现,50℃下制备的P(DMAA-co-NIPAm)共聚物凝胶具有较为疏松的网络结构和相对较快的溶胀速率及温度响应特性.光化学合成方法较传统的热聚合制备方法具有简便、快捷的特点,合成过程仅需2 min.
文摘Due to the poor salt tolerance and heat resistance of the partially hydrolyzed acryl amide in the reservoir of high temperature and high inorganic salt,and the poor ability of shear,the hydrophobically associating terpolymers acrylamide\|hexadecyl ally ammonium chloride\|2\|acrylamino\|2\|metyl propane sulfuric acid (AM\|C 16 DMAAC\|AMPS) is prepared by micelle polymerization with the nonionic monomer\|AM,the anionic monomer\|AMPS,the cationic monomer\|C 16 DMAAC,It is investigated that the effect of the content of the hydrophobic monomer,anionic monomer,cationic monomer,reaction temperature and the concentration of the inorganic salt and the surfactant on the viscosity of the hydrophobically associating aqueous soluble terpolymers in brine.The results show that the aqueous soluble hydrophobically associating terpolymers(1000?mg/L) have good viscofication effect in brine(20000?mg/L),when the content of the hydrophobic monomer is 1\^2%,and of the anionic monomer is 30%,the hydrophobically associating terpolymers can meet the need of polymer flooding in reservoir of the high concentration inorganic salt.
文摘采用γ-射线辐照法,以壳聚糖、丙烯酰胺(AM)和二甲基二烯丙基氯化铵(DMDAAC)为原料制备了壳聚糖-AM-DMDAAC接枝共聚物。考察了吸收剂量、单体AM与DMDAAC重量比、壳聚糖与总单体重量比、反应物浓度等因素对接枝共聚反应的影响。结果表明,随着吸收剂量的增大,接枝率和阳离子度上升,而接枝效率变化不大,吸收剂量为4 k Gy时最佳,接枝率、接枝效率和阳离子度分别为210.9%、96.1%和26.9%;接枝率和接枝效率随着AM与DMDAAC重量比的增加而提高,当AM与DMDAAC重量比为7:3时达到最大值,分别为182.6%和98.8%;随着壳聚糖与总单体重量比的降低,接枝率、接枝效率和阳离子度逐渐增加,当壳聚糖与总单体重量比为3:8时,其值分别为182.5%、94.9%和25.5%,接枝效果最好;接枝率、接枝效率和阳离子度随着反应物浓度的降低先上升后降低,醋酸最佳用量为100 m L。
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.
