聚甲基丙烯酸二甲氨基乙酯对HPAM水溶液性质的影响
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摘要
以甲基丙烯酸二甲氨基乙酯为单体合成了温敏型聚合物聚甲基丙烯酸二甲氨基乙酯(PB),并将其与部分水解聚丙烯酰胺(HPAM)溶液混合以改善HPAM溶液的高温性能。利用~1H NMR,GPC,DLS等方法分析了聚合物的结构,考察了PB对HPAM水溶液黏度及黏度保持率的影响,并探讨了HPAM/PB水溶液增黏的机理。实验结果表明,HPAM与PB均为线型高分子。加入PB可提高HPAM水溶液的黏度,且当V(PB):V(HPAM)=1.1%时,黏度可提高50%。由于PB具有温敏性,因此当温度从20℃升高至90℃时,加入1.1%(φ)PB的HPAM水溶液黏度保持率为67.2%,而相同浓度HPAM水溶液的黏度保持率仅为33.1%。HPAM水溶液的单分子链呈溶解状态,加入PB后HPAM与PB形成了纳米聚集体从而使HPAM的黏度随PB用量的增大而线性增大。
A thermo-responsive homopolymer,poly(dimethylaminoethyl methacrylate)(PB),was synthesized by free radical polymerization of dim ethyl aminoethyl methacrylate and then mixed with partial hydrolyzed polyacrylamide(HPAM) to improve the high-temperature performance of the HPAM solution.The polymer structure,the effects of PB on the viscosity and viscosity retention of the HPAM solution,and the mechanism of the viscosity enhancement of the PB/HPAM mixture were investigated by means of ~1H NMR,GPC,DLS and rheometer.The results indicated that both PB and HPAM had linear structure.The viscosity of the HPAM solution increased 50%when the volume ratio of PB to HPAM was 1.1%.After mixing with 1.1%(φ) PB and heating from 20℃ to 90℃,the viscosity retention of the HPAM solution was 67.2% due to the thermo-sensitivity of PB.In contrast,the viscosity retention of the pure HPAM solution was only 33.1%under the similar conditions.HPAM was dissolved in water in the form of molecules.After PB was added,HPAM/PB formed nano-aggregations,so the viscosity of the HPAM aqueous solution increased linearly with increasing the PB dosage.
A thermo-responsive homopolymer,poly(dimethylaminoethyl methacrylate)(PB),was synthesized by free radical polymerization of dim ethyl aminoethyl methacrylate and then mixed with partial hydrolyzed polyacrylamide(HPAM) to improve the high-temperature performance of the HPAM solution.The polymer structure,the effects of PB on the viscosity and viscosity retention of the HPAM solution,and the mechanism of the viscosity enhancement of the PB/HPAM mixture were investigated by means of ~1H NMR,GPC,DLS and rheometer.The results indicated that both PB and HPAM had linear structure.The viscosity of the HPAM solution increased 50%when the volume ratio of PB to HPAM was 1.1%.After mixing with 1.1%(φ) PB and heating from 20℃ to 90℃,the viscosity retention of the HPAM solution was 67.2% due to the thermo-sensitivity of PB.In contrast,the viscosity retention of the pure HPAM solution was only 33.1%under the similar conditions.HPAM was dissolved in water in the form of molecules.After PB was added,HPAM/PB formed nano-aggregations,so the viscosity of the HPAM aqueous solution increased linearly with increasing the PB dosage.
引文
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[4]雒春辉.AMPS共聚物降失水剂分子的构型与性能[J].石油化工,2016,45(7):851-855.
[5]Wever D A Z,Picchioni F,Broekhuis A A.Polymers for enhanced oil recovery:A paradigm for structure-property relationship in aqueous solution[J].Prog Polym Sci,2011,36(11):1558-1628.
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[7]罗健辉,卜若颖,王平美,等.驱油用抗盐聚合物KYPAM的应用性能[J].油田化学,2002,19(1):64-67.
[8]王惠厦,姚林,丁彬,等.疏水改性聚丙烯酰胺溶液的分子模拟[J].高等学校化学学报,2013,34(5):1295-1302.
[9]唐善法,罗平亚.疏水缔合水溶性聚合物的研究进展[J].现代化工,2002,22(3):10-13.
[10]Chang Y,Mccormick C L.Water-soluble copolymers:49.Effect of the distribution of the hydrophobic cationic monomer dimethyldodecyl(2-acrylamidoethyl)ammonium bromide on the solution behavior of associating acrylamide copolymers[J].Macromolecules,1993,26(22):6121-6126.
[11]曹绪龙,胡岳,宋新旺,等.三乙烯四胺对磺化聚丙烯酰胺性能的影响[J].高等学校化学学报,2015,36(7):1437-1440.
[12]张旭锋,吴文辉.阴离子疏水缔合共聚物/阳离子蠕虫状胶束协同增粘自组装网络[J].化学学报,2009,67(20):2381-2384.
[13]宋华,历娜,陈彦广,等.络合剂提高磺化聚丙烯酰胺耐温抗盐性能的研究[J].能源化工,2015(3):39-43.
[14]Plamper F A,Ruppel M,Schmalz A,et al.Tuning the thermoresponsive properties of weak polyelectrolytes:Aqueous solutions of star-shaped and linear poly(N,N-dimethylaminoethyl methacrylate)[J].Macromolecules,2007,40(23):8361-8366.
[15]Burchard W.Static and dynamic light scattering from branched polymers and biopolymers[M]//Light Scattering from Polymers.Berlin Heidelberg:Springer,1983:1-124.
[16]郭睿威,吴大成,鹿现栋,等.热缔合接枝物HPAM-gPNIPAm的温敏增稠性能[J].石油化工,2003,32(8):690-694.