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首页> 外文期刊>Journal of coatings technology and research >Characterization and properties of gradient polyacrylate latex particles by gradient emulsion polymerization
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Characterization and properties of gradient polyacrylate latex particles by gradient emulsion polymerization

机译：梯度乳液聚合法表征梯度聚丙烯酸酯胶乳颗粒的性能

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In this study, gradient acrylate latex particles were synthesized by gradient copolymerization. Az-Butyl acrylate (BA) and methyl methacrylate (MMA) were used as co-monomers, dodecyl diphenyl ether sodium disulfonate as the emulsifier, and potassium persulfate as the initiator. The technique involved the continuous addition of one monomer mixture into a stirred tank containing another monomer mixture. Their micro-structure and properties were analyzed by nuclear magnetic resonance (NMR), gel permeation chroma-tography (GPC), differential scanning calorimetry (DSC), atomic force microscopy (AFM), transmission electron microscopy (TEM), and particle size analysis. 'H-NMR spectra show a gradual change in the chemical composition with the growth of molecular chains. The gradient polymer latexes, the instantaneous copolymer composition of which varies as the polymerization proceeds, are obtained. GPC analyses show that the aggregated molecular chain in the BA-centered latex particle experiences a process from dominant BA to MMA with changes in the monomer's feed composition during the polymerization. Particle size and TEM analyses show that the increasing latex size agrees well with the gradient growth pattern. DSC analyses show that the gradient latex particles exhibit only one broadened and ambiguous glass transition region. AFM analyses indicate no obvious microphase segregation occurs in the gradient latex particles, further verifying that the gradient microstructure is obtained.
机译：在这项研究中，通过梯度共聚合成了梯度丙烯酸酯胶乳颗粒。丙烯酸Az-丁基丁酯（BA）和甲基丙烯酸甲酯（MMA）用作共聚单体，十二烷基二苯醚二磺酸钠作为乳化剂，过硫酸钾作为引发剂。该技术涉及将一种单体混合物连续添加到包含另一种单体混合物的搅拌釜中。通过核磁共振（NMR），凝胶渗透色谱法（GPC），差示扫描量热法（DSC），原子力显微镜（AFM），透射电子显微镜（TEM）和粒度分析对它们的微观结构和性质进行了分析。 。 1 H-NMR谱显示化学组成随分子链的增长而逐渐变化。得到梯度聚合物胶乳，其瞬时共聚物组成随聚合反应而变化。 GPC分析表明，在聚合过程中，以BA为中心的胶乳颗粒中的聚集分子链经历了从主要BA到MMA的过程，单体进料组成发生了变化。粒度和TEM分析表明，胶乳尺寸的增加与梯度生长方式非常吻合。 DSC分析表明，梯度胶乳颗粒仅表现出一个变宽且模糊的玻璃化转变区域。原子力显微镜分析表明，在梯度胶乳颗粒中没有明显的微相偏析，进一步证明了获得了梯度微结构。

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