文章摘要
疏水缔合碱溶性聚合物的相态转变与流变行为
Phase Transition and Rheological Behavior of Hydrophobically Associative Alkali-Soluble Polyacrylic Emulsion
  
DOI:10.16865/j.cnki.1000-7555.2018.06.017
中文关键词: 疏水缔合  碱溶性聚合物  相态转变  流变行为  增稠剂
英文关键词: hydrophobic association  alkali-soluble polymer  phase transition  rheological behavior  thickener
基金项目:国家自然科学基金资助项目(51503023);省教育厅优秀人才项目(LJQ2012046)
作者单位
刘国军1, 张生义1, 张桂霞1, 解宝强1, 王 艳1, 余大平2 1. 大连工业大学 纺织与材料工程学院辽宁 大连 116034 2. 广州市鼎茂新材料科技有限公司广东 广州 510240 
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中文摘要:
      采用单体直接滴加-半连续乳液聚合工艺合成了二十二烷基聚氧乙烯醚甲基丙烯酸酯(BEM)含量不同的疏水改性碱溶性聚丙烯酸乳液(HASE)。控制NaOH/COOH的摩尔比(R),研究了R对HASE体系的pH、透光率、黏度、溶解参数(SP)、表观离解常数(pKa)及η0、η、[η]和流变性的影响。结果表明,pH在R=0.1~0.8范围呈平台状,HASE相态转变的起点是R≈0.4,终点是R≈0.8,对应的pH≈7;BEM量越多,质子迁移吉布斯能(ΔGel)越大,相态转变的R值越高;η0、η曲线在R≈0.8前后表现出2个斜率,而[η]只有1个斜率,且η0、η、[η]具有pH敏感性;稠度系数(K)随pH和BEM增加先增后降,流动指数(n)随pH和BEM先减小后增大。
英文摘要:
      Hydrophobically-modified alkali soluble polyacrylic emulsions (HASE) with different amount of methacrylic esters of ethoxylated (25 mol EO) C22(BEM) were synthesized via directly monomer feeding semi-continuous emulsion polymerization. Through the control of NaOH/COOH mole ratio R, effects of R on pH, light transmittance, viscosity, solubility of particle SP, apparent dissociation constant pKa and η0, η, [η] were investigated. The results show that the pH is platform-like at the range of R=0.1~0.8, the starting point of HASE phase transition from hard spherical latex particle to solution is R≈0.4, and the end point is R≈0.8 with the corresponding pH of 7. The more amount of BEM content, the greater proton transfer Gibbs energy ΔGel, the higher R value of phase transition is. The curves of η0 and η show two slopes at R approximately 0.8, while [η] only a slope. η0, η and [η] exhibit sensitive to pH. With the increase of pH and BEM content, the viscosity coefficient K firstly increases and then decreases, and the flow index n firstly decreases and then increases.
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