下限臨界共溶温度（ＬＣＳＴ）における高分子吸着処理とポリスチレンラテックスの安定性

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  • Adsorption Treatment of Polymer at Lower Critical Solution Temperature (LCST) and Its Effect on The Stability of Polystyrene Latices
  • カゲン リンカイ キョウヨウ オンド LCST ニ オケル コウブンシ キュウ

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Adsorption behavior and the effect on colloid stability of water soluble polymer having a lower critical solution temperature (LCST) have been studied using polystyrene latices plus hydroxypropyl cellulose (HPC). Three HPC-samples used here were obtained from commercial products by fractional precipitation. The molecular weights (Mw) were determined by the viscosity measurements as 93×104, 30×104 and 5.3×104. The LCST values were between 45 and 55°C.<BR>Saturated adsorbance (As) depended significantly on the molecular weight of HPC and on the adsorption temperature. The temperature dependence of the As was remarkable : the As at each LCST was 1.5 times as large as the value at 30°C. Furthermore, the maximum As values obtained at the LCST were kept over a long time duration at room temperature. The dense adsorption layer formed on the latex particles at LCST showed strong protection against salt and temperature. The latex particles treated at LCST did not coagulated in the concentrated MgCl2 solution (-5 mol/l).

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  • 高分子論文集

    高分子論文集 40 (4), 273-278, 1983

    公益社団法人 高分子学会

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