Nanosize polymer latices made by microemulsion copolymerization: Preparation and characterization

Polymer nanoparticles were prepared by a methyl methacrylate/butyl methacrylate/2‐hydroxyethyl methacrylate/acrylate or methyl acrylate microemulsion copolymerization process. A microemulsion copolymerization method was used. With this process high polymer : surfactant weight ratios (≥15 : 1), relatively concentrated (～ 30 wt %) lattices, and small (～ 60 nm) particle diameters were obtained. Properties of the latices were characterized in detail by TEM, DSC, dynamic light scattering, spectrophotometry, and tensile strength testing. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 90: 3625–3630, 2003     

P(St/BA/DBMEA)阳离子乳液在污水净化中的应用

~~P(St/BA/DBMEA)阳离子乳液在污水净化中的应用@邹其超$湖北大学化学与材料科学学院!武汉,430062 @张金枝$湖北大学化学与材料科学学院!武汉,430062 @李小琴$湖北大学化学与材料科学学院!武汉,430062 @程时远$湖北大学化学与材料科学学院!武汉,430062~~~~~~     

Influence of surfactants on an extracellular lipase fromPythium ultimum

The activity of an extracellular lipase from the fungusPythium ultimum was studied as a function of emulsion properties, and the amount and type of surfactants used in preparing the emulsions. The highest emulsified globule surface area as a function of surfactant concentration and emulsion stability were in the order taurocholic acid >Triton X-100>3-[(3-cholamidopropyl)dimethylammonio]-1-propanesulfonate (CHAPS). Lipase activity was dependent on both the type and the concentration of surfactant, with taurocholic acid and CHAPS giving tenfold stimulation over the control at 0.1 and 0.8 mM, respectively. The evidence suggests that the influence of surfactant is related more to interaction with the enzyme at the oil-water interface than to providing greater interfacial surface area.     

改善鎓盐类阳离子光引发剂光敏性的研究概况

鎓盐类阳离子型光引发剂是一类新型高效的紫外光固化引发剂,它在紫外光固化领域中有着十分重要的地位。重点介绍了增强鎓盐光敏性的方法及相关机理,简单介绍了鎓盐类阳离子光引发剂的特点和研究进展。     

松香改性表面活性剂的研究进展

探讨了近年来以松香及其衍生物为原料合成各类表面活性剂的研究，并介绍了松香类表面活性剂的特点及其发展趋势。     

Preparation and retention of poly(ethylene oxide)‐grafted cationic polyacrylamide microparticles

Novel microparticles of poly(ethylene oxide) (PEO)‐grafted cationic polyacrylamide were prepared through the free‐radical tetrapolymerization of acrylamide, acryloyloxyethyl trimethylammonium chloride (DAC), PEO macromonomer, and N,N′‐methylene bisacrylamide in an inverse microemulsion. The effects of the DAC content and the PEO chain length and content on the diameter and distribution of the microparticles were studied. Highly effective retention aids were obtained in retention experiments with fibers. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 101: 359–363, 2006     

高取代度阳离子淀粉在生活污水处理中的应用

采用实验室研制的高取代度阳离子淀粉作为絮凝剂对生活污水进行处理，获得良好的效果。通过实验探讨了高取代度阳离子淀粉的加入量、废水的pH及絮凝时间对絮凝效果的影响，确定了高取代度阳离子淀粉处理生活污水的最佳条件。同时测定了处理前后的生活污水的CODCr值，发现高取代度阳离子淀粉能大幅度地降低生活污水的COD Cr值。     

表面活性剂对结晶过程影响的研究进展

这是一篇有２５篇参考文献的综述。文中介绍了近期关于表面活性剂在结晶过程中对成核、晶体生长、生长机制的影响的研究进展以及在防止无机盐产品因再结晶而结块方面的应用情况。     

软段种类及相对分子质量对阴离子水性聚氨酯性能的影响

采用聚酯多元醇、异佛尔酮二异氰酸酯、二羟甲基丙酸等原料，制备了阴离子型水性聚氨酯乳液，并测试了其性能。结果表明：软段种类及相对分子质量对水性聚氨酯乳液的黏度、粒径和力学性能等均有影响。     

光引发阳离子聚合及其在环氧树脂固化研究中的进展

从光引发阳离子聚合的特点、常见阳离子型光敏引发剂及其引发聚合机理、光引发环氧树脂阳离子聚合体系及发展前景等几个方面进行了简要概述。