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平行壁面间平衡聚合物吸附行为的自洽场分析 被引量:2

Self Consistent Field Analysis on the Adsorption of Equilibrium Polymers between Two Parallel Plates
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摘要 采用自洽场理论研究了平衡聚合物在平行壁面间的吸附规律.结果表明,平衡聚合物的吸附行为可根据壁面吸附强度划分为弱吸附和强吸附两个区间.在强吸附区间,平衡聚合物可以形成明确的吸附层,增大吸附强度能够引起平均分子链长的陡增,但不会改变链长分布的指数形式.平衡聚合物的长链分子在强吸附条件下较短链分子更靠近吸附壁面,在弱吸附条件下,则更接近体系中心.通过计算壁面压强发现:在弱吸附作用下,吸附壁面始终受到分子链的推斥作用;在强吸附作用下,分子链对壁面的作用随壁面间距的加大由推斥转变为吸引.平衡聚合物的溶解性和排空效应以及壁面吸附作用之间存在竞争关系,加大排除体积作用参数会引起分子链密度分布的均一化和壁面承受压强的降低. Self-consistent field theory is proposed to investigate equilibrium polymers adsorbed between two parallel plates.According to numerical results,the adsorption behavior of the equilibrium polymers can be classified into two regimes,viz.weak adsorption and strong adsorption.For strong adsorption,the apparent adsorption layers of the equilibrium polymers are observed from density profiles.Within this regime,the average chain length increases rapidly as the adsorption strength rising but the chain length distribution remains exponential.Compared with short chain equilibrium polymers,long chain equilibrium polymers are closer to the plates in the case of strong adsorption and are more concentrated in the middle of the gap in the case of weak adsorption.Given that the adsorption strength is weak,the forces applied to the plates are always repulsive for all separation distances.Widening the gap gives rise to a transition of the forces from repulsion to attraction if the adsorption is strong.Furthermore,the density profiles of the equilibrium polymers suggest competition among solubility,adsorption,and depletion.Higher solubility not only makes the density profiles more homogeneous but also decreases the pressures applied by the polymeric chains.
出处 《物理化学学报》 SCIE CAS CSCD 北大核心 2010年第6期1629-1636,共8页 Acta Physico-Chimica Sinica
关键词 吸附 平衡聚合物 自洽场理论 密度分布 缔合 排空效应 Adsorption Equilibrium polymer Self-consistent field theory Density profile Association Depletion effect
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  • 1Feldman,K.E.; Kade,M.J.; de Greef,T.F.A.; Meijer,E.W.; Kramer,E.J.; Hawker,C.J.Macromolecules,2008,41(13):4694.
  • 2Scott,R.S.J.Phys.Chem.,1965,69(1):261.
  • 3Sijbesma,R.P.; Beijer,F.H.; Brusveld,L.; Folmer,B.J.B.; Hirschberg,K.; Lange,R.F.M.; Lowe,J.K.L.; Meijer,E.W.Science,1997,278(15):1601.
  • 4Binder,W.Adv.Polym.Sci.,2007,207:1.
  • 5Lehn,J.M.Prog.Polym.Sci.,2005,30(8-9):814.
  • 6Noro,A.; Tamura,A.; Wakao,S.; Takano,A.; Matsushita,Y.Macromolecules,2008,41(23):9277.
  • 7Serpe,M.J.; Rivera,M.; Kersey,F.R.; Clark,R.L.; Craig,S.L.Langmuir,2008,24(9):4738.
  • 8Douglas,J.F.Langmuir,2009,25(15):8386.
  • 9Flory,P.J.Principles of polymer chemistry.Ithaca,NY:Cornell University Press,1953.
  • 10Viswanathan,K.; Ozhalici,H.; Elkins,C.L.; Heisey,C.; Ward,T.C.; Long,T.E.Langmuir,2006,22(3):1099.

二级参考文献124

共引文献6

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  • 1薛永久.PAM-CMC聚合物泥浆钻进永庆第三纪地层的应用[J].煤炭技术,2004,23(7):88-88. 被引量:4
  • 2孙志斌,郑延欣,李明远,林梅钦,吴肇亮.交联聚合物溶液封堵多孔介质机理研究[J].高分子材料科学与工程,2005,21(2):225-228. 被引量:14
  • 3邱正松,黄维安,徐加放,吕开河,王在明.改性多元醇防塌剂的研制及其作用机理研究[J].中国石油大学学报(自然科学版),2006,30(6):51-54. 被引量:16
  • 4Stephen A,Rohleder W,Wayne Set al.Challengesof drilling an ultra-deep well in deepwater-spa pros-pect. IADC/SPE Drilling Conference . 2008
  • 5Jiankang Guo,Jienian Yan,Weiwang Fan et a1.Ap-plication of strongly inhibitive silicate-based drillingfluids in troublesome shale formation in Sudan. Journal of Petrology . 2006
  • 6Miller J.Biodegradable surfactants aid the develop-ment of environmentally acceptable drilling-fluid ad-ditives. SPE International Symposium on OilfieldChemistry . 2007
  • 7Stephen A,Rohleder W,Wayne Set al.Challengesof drilling an ultra-deep well in deepwater-spa pros-pect. IADC/SPE Drilling Conference . 2008
  • 8Bradshaw R,Hodge R,Wolf N O.Formate-basedreservoir drilling fluid resolves high-temperaturechallenges in the natural sea. International Sym-posium and Exhibition on Formation Damage Con-trol . 2006
  • 9Orienti I,,Pietra A D,Luppi B,et al.Crosslinked polyviny-lalcohol hydrogels as vehicles for hydrophilic drugs. De-part ment Pharm Sci . 2000
  • 10A Husen A Ali,W WFrenier,Z Xiao et al.Chelating Agent-Based Fluids for Opti mal Sti mulation of High-Temperature Wells. . 2002

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