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Polymer chain pinning at interfaces in CaCO_3-SBR latex composites

机译：CaCO_3-SBR乳胶复合材料界面处的聚合物链固定

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摘要

The viscoelastic properties of carbonate-based coatings in ambient and water saturated conditions have been investigated using dynamic mechanical thermal analysis (DMTA). At low frequencies, viscous flow is suggested to be due to the reorientation of polymer chains at particle interfaces. At higher frequencies the composite storage modulus, as normalised to that of the latex, decreases due to the conjoint action of increased heat and decreased molecular chain mobility at the interfaces. Water is found to weaken inter-facial pinning of the polymer molecules. Water is able to conduct heat away from the solid component of the microstructure more effectively than air, and reduces the effect of temperature on the softening of latex. Pore space allows greater microstructural mobility and consequently polymer chains at interfaces can orient more easily to the loading direction. The glass transition temperature, the normalised storage modulus and the normalised loss modulus were found to depend on both the latex fraction and on the porosity. This paper highlights and explains particular conditions that may arise during processing by which carbonate-based coatings soften.
机译：已使用动态机械热分析（DMTA）研究了碳酸盐基涂料在环境和水饱和条件下的粘弹性。在低频下，粘滞流动被认为是由于颗粒界面处聚合物链的重新取向所致。在较高的频率下，归因于乳胶的归一化，复合储能模量由于热量增加和界面处分子链迁移率降低的共同作用而降低。发现水削弱了聚合物分子的界面钉扎。与空气相比，水能够更有效地将热量从微结构的固体成分传导出去，并降低了温度对胶乳软化的影响。孔空间允许更大的微结构移动性，因此界面处的聚合物链可以更轻松地定向于加载方向。发现玻璃化转变温度，归一化的储能模量和归一化的损耗模量取决于胶乳分数和孔隙率。本文重点介绍并解释了碳酸盐基涂料软化过程中可能出现的特殊条件。

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  • 来源
    《Materials Science and Engineering》 |2010年第9期|2363-2369|共7页
  • 作者

    F.Touaiti; P. Alam; M.Toivakka; D.W. Bousfield;

  • 作者单位

    Laboratory of Paper Coating and Converting, and Center for Functional Materials, Abo Akademi University, Porthansgatan 3, Turku 20500, Finland;

    Laboratory of Paper Coating and Converting, and Center for Functional Materials, Abo Akademi University, Porthansgatan 3, Turku 20500, Finland;

    Laboratory of Paper Coating and Converting, and Center for Functional Materials, Abo Akademi University, Porthansgatan 3, Turku 20500, Finland;

    Paper Surface Science Program, Department of Chemical Engineering, University of Maine, Orono, ME 04469-5737, USA;

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  • 正文语种 eng
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  • 关键词

    particle; coatings; DMTA; polymer pinning; porosity; latex; composite; viscoelastic; carbonate;

    机译：粒子;涂料;DMTA;聚合物钉扎;孔隙率胶乳;综合;粘弹性碳酸盐;

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