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Gelation and Degelation of PVA in Aqueous BaTiO_3 Slurries

机译：BaTiO_3水性浆料中PVA的胶凝和脱胶

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摘要

Poly(vinyl alcohol) (PVA) gels favorably with boron oxide (B_2O_3) in aqueous slurries of BaTiO_3, resulting in a dilatant rheology, but the gelation and dilatancy can be efficiently reduced by the use of hydroxylated BaTiO_3. The degelation effect caused by the use of hydroxylated BaTiO_3 was studied, and the corresponding degelation mechanisms were clarified. Interestingly, the hydroxylated BaTiO_3 interacts better than the as-received form with PVA and B_2O_3, and the hydroxylated form is more chemically stable and less soluble in the aqueous slurry. Based on these specific properties of hydroxylated BaTiO_3, especially its good chemical stability, the free concentrations of PVA and ~-B(OH)_4 in the aqueous slurry are efficiently diminished. The decreased free concentrations of PVA and B_2O_3 facilitate the reduction of the gelation opportunity between them, leading to a great improvement in the rheo-logical behavior of the aqueous slurries.
机译：在BaTiO_3的水性浆料中，聚乙烯醇（PVA）与氧化硼（B_2O_3）有利地形成凝胶，导致流变膨胀，但是通过使用羟基化的BaTiO_3可以有效地减少胶凝和膨胀。研究了使用羟基化的BaTiO_3引起的脱胶效果，并阐明了相应的脱胶机理。有趣的是，羟基化的BaTiO_3的相互作用要比按预期的形式更好地与PVA和B_2O_3相互作用，并且羟基化的形式在化学上更稳定并且不易溶于水性浆料。基于羟基化BaTiO_3的这些特定特性，尤其是其良好的化学稳定性，可以有效地减少水性浆料中PVA和〜-B（OH）_4的游离浓度。 PVA和B_2O_3的自由浓度降低，有利于减少它们之间的胶凝机会，从而导致水性浆料的流变行为大大改善。

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  • 来源
    《Journal of the American Ceramic Society》 |2013年第2期|436-441|共6页
  • 作者

    Chia-Chen Li; Chung-Hsuan Chang;

  • 作者单位

    Institute of Materials Science and Engineering, Department of Materials & Mineral Resources Engineering, National Taipei University of Technology, Taipei 10608, Taiwan;

    Institute of Materials Science and Engineering, Department of Materials & Mineral Resources Engineering, National Taipei University of Technology, Taipei 10608, Taiwan;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
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  • 正文语种 eng
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