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    题名: Preparation of polyurethane dispersions by miniemulsion polymerization
    作者: Li, Chien-yu;Chiu, Wen-yen;Don, Trong-ming
    贡献者: 淡江大學化學工程與材料工程學系
    关键词: Crosslinking;Dispersions;Emulsion polymerization;Molecular weight distribution;Particle size analysis;Polypropylenes;Hexadecane (HD);Miniemulsion;Oil phase;Sodium dodecyl sulfate (SDS);Polyurethanes
    日期: 2005-10
    上传时间: 2013-06-13 11:28:36 (UTC+8)
    出版者: Hoboken: John Wiley & Sons, Inc.
    摘要: With a two-step miniemulsion polymerization, hydrophobic polyurethane (PU) dispersions were prepared with a cosurfactant, the costabilizer hexadecane (HD) in the oil phase, and sodium dodecyl sulfate (SDS) in the water phase. The first step involved the formation of NCO-terminated prepolymers between isophorone diisocyanate and poly(propylene glycol) oligomer in toluene. Next, PU dispersions were produced by a miniemulsion method in which an oil phase containing NCO-terminated prepolymers, HD, the chain extender 1,4-butanediol (BD), the crosslinking agent trimethylol propane (TMP), and the catalyst dibutyltin dilaurate was dispersed in the water phase containing SDS. The influence of experimental parameters, such as the ultrasonication time, concentrations of SDS and HD, and TMP/BD and NCO/OH equivalent ratios, on the sizes of the miniemulsion droplets and polymer particles, as well as the molecular weights and thermal properties of the PU polymer, was examined. The chemical structure of the produced PU polymer was identified with a Fourier transform infrared spectrometer. The molecular weight distribution and average particle size were measured through gel permeation chromatography and dynamic light scattering, respectively. The thermal stability of the PU polymer was characterized with thermogravimetric analysis.
    關聯: Journal of Polymer Science, Part A: Polymer Chemistry 43(20), pp.4870-4881
    DOI: 10.1002/pola.20959
    显示于类别:[化學工程與材料工程學系暨研究所] 期刊論文


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