利用同步辐射小角X射线散射技术,对不同相对分子质量的水溶性高分子聚氧化乙烯(PEO)与电荷稳定的聚甲基丙烯酸甲酯(PMMA)乳胶的混合体系的相行为进行了研究.PEO与PMMA乳胶混合体系的相行为与体系中乳胶粒子的体积分数和PEO的浓度相关.在一定乳胶粒子体积分数下,在较低PEO浓度下,混合体系保持均匀分散性.而当PEO浓度高于某一临界浓度时,混合体系将发生相分离,生成集团相或者形成面心立方(FCC)晶体结构.PEO相对分子质量的大小也是影响混合体系相行为的重要因素.当PEO的相对分子质量较高时,混合体系发生相分离所对应的临界PEO浓度较低.除此,PEO相对分子质量对混合体系的结晶行为也有影响.在低乳胶粒子体积分数下,较高相对分子质量的PEO容易使乳胶粒子结晶.相反的,在较高乳胶粒子体积分数下,较低相对分子质量的PEO容易使乳胶粒子堆积形成结晶结构.
参考文献
| [1] | Asakura S,Oosawa F.Surface Tension of High Polymer Solutions[J].J Chem Phys,1954,22:1255. |
| [2] | Gast A P,Hall C K,Russel W B.Polymer-induced Phase Separations in Nonaqueous Colloidal Suspensions[J].J Colloid Interface Sci,1983,96:251-267. |
| [3] | Lekkerkerker H N W,Poon W C K,Pusey P N,et al.Phase Behaviour of Colloid + Polymer Mixtures[J].Europhys Lett,1992,20:559-564. |
| [4] | Segrè P N,Prasad V,Schofield A B,et al.Glasslike Kinetic Arrest at the Colloidal-gelation Transition[J].Phys Rev Lett,2001,86:6042-6045. |
| [5] | Stradner A,Sedgwick H,Cardinaux F,et al.Equilibrium Cluster Formation in Concentrated Protein Solutions and Colloids[J].Nature,2004,432:492-495. |
| [6] | Dinsmore A D,Weitz D A.Direct Imaging of Three-dimensional Structure and Topology of Colloidal Gels[J].J Phys:Condens Matter,2002,14:7581-7597. |
| [7] | Sedgwick H,Egelhaaf S U,Pooh W C K.Clusters and Gels in Systems of Sticky Particles[J].J Phys:Condens Matter,2004,16:4913-4922. |
| [8] | Sedgwick H,Kroy K,Salonen A,et al.Non-equilibrium Behavior of Sticky Colloidal Particles:Beads,Clusters and Gels[J].Eur Phys J E,2005,16:77-80. |
| [9] | Sanchez R,Bartlett P.Equilibrium Cluster Formation and Gelation[J].J Phys:Condens Matter,2005,17:3551-3556. |
| [10] | Dibble C J,Kogan M,Solomon M J.Structure and Dynamics of Colloidal Depletion Gels:Coincidence of Transitions and Heterogeneity[J].Phys Rev E,2006,74:0414031-041411. |
| [11] | Cardinaux F,Stradner A,Schurtenberger P,et al.Modeling Equilibrium Clusters in Lysozyme Solutions[J].Europhys Lett,2007,77:488041-488045. |
| [12] | Baglioni P,Fratini E,Lonetti B,et al.Structural Arrest in Concentrated Cytochrome C Solutions:the Effect of pH and Salts[J].J Phys:Condens Matter,2004,16:S5003 5022. |
| [13] | Stradner A,Cardinaux F,Schurtenberger P.A Small-Angle Scattering Study on Equilibrium Clusters in Lysozyme Solutions[J].J Phys Chem B,2006,110:21222-21231. |
| [14] | Sciortino F,Mossa S,Zaccarelli E,et al.Equilibrium Cluster Phases and Low-Density Arrested Disordered States:The Role of Short-Range Attraction and Long-Range Repulsion[J].Phys Rev Lett,2004,93:0557011-055704. |
| [15] | Sciortino F,Tartaglia P,Zaccarelli E.One-Dimensional Cluster Growth and Branching Gels in Colloidal Systems with Short-Range Depletion Attraction and Screened Electrostatic Repulsion[J].J Phys Chem B,2005,109:21942-21953. |
| [16] | Wu J,Liu Y,Chen W R,et al.Structural Arrest Transitions in Fluids Described by Two Yukawa Potentials[J].Phys Rev E,2004,70:0504011-050404. |
| [17] | Campbell A I,Anderson V J,van Duijneveldt J,et al.Dynamical Arrest in Attractive Colloids:the Effect of Long-Range Repulsion[J].Phys Rev Lett,2005,94:20830112083014. |
| [18] | Zhu J,Li M,Rogers R B,et al.Crystallization of Hard Sphere Colloids in Microgravity[J].Nature,1997,387:883-885. |
| [19] | Wagenborg B.Space for Growth:Colloidal Crystallization in Microgravity[J].MISEP 2 Capstone Project 2008. |
| [20] | Meller A,Stavans J.Stability of Emulsions with Nonadsorbing Polymers[J].Langrnuir,1996,12:301-304. |
| [21] | McFarlane N L,Wagner N J,Kaler E W,et al.Calorimetric Study of the Adsorption of Poly(ethylene oxide) and Poly (vinyl pyrrolidone) onto Cationic Nanoparticles[J].Langrnuir,2010,26:6262-6267. |
| [22] | Lietor-Santos J J,Kim C,Lynch M L,et al.The Role of Polymer Polydispersity in Phase Separation and Gelation in Colloid-Polymer Mixtures[J].Langmuir,2010,26:3174-3178. |
| [23] | Olsson M,Joabsson F,Piculell L.Particle-Induced Phase Separation in Mixed Polymer Solutions[J].Langmuir,2005,21:1560-1567. |
| [24] | Vivarès D,Belloni L,Tardieu A,et al.Catching the PEG-induced Attractive Interaction Between Proteins[J].Eur Phys J E,2002,9:15-25. |
| [25] | Kulkarni A,Zukoski C.Depletion Interactions and Protein Crystallization[J].J Crys Grow,2001,232:156-164. |
| [26] | Liu J X,Men Y F.Phase Behavior of Charge Stabilized Colloid Dispersion with Added Water Soluble Polymers[J].Chinese J Polym Sci,2013,31 (9):1218-1224. |
| [27] | Huang X Y,Brittain W J.Synthesis and Characterization of PMMA Nanocomposites by Suspension and Emulsion Polymerization[J].Macromolecules,2001,34:3255-3260. |
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