Integrating optical coherence tomography with gravimetric and video analysis (OCT-Gravimetry-Video method) for studying the drying process of polystyrene latex system.
Integrating optical coherence tomography with gravimetric and video analysis (OCT-Gravimetry-Video method) for studying the drying process of polystyrene latex system.
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DOI：
10.1038/s41598-018-30914-8
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发表时间：
2018-08-28
影响因子：
4.6
通讯作者：
El-Aasser MS
中科院分区：
文献类型：
--
作者：
Huang H;Huang Y;Lau W;Ou-Yang HD;Zhou C;El-Aasser MS
乳胶是一种亚微米级聚合物粒子的水性分散体，广泛用作水性涂料和胶粘剂中的聚合物基料。胶乳的干燥是不均匀的，在此期间颗粒的空间分布是不均匀的并且随时间变化，通常导致干燥膜的完整性的损害。为了研究乳胶的干燥不均匀性，我们开发了一个系统集成光学相干断层扫描（OCT）与重量和视频分析（OCT-重量-视频方法），非破坏性地监测干燥过程中的非成膜乳胶组成的硬聚苯乙烯球随时间的推移。乳胶内部结构的OCT结构图像和散斑图像显示了颗粒的堆积过程、乳胶的脱离以及横截面视图中明显剪切带的形成。视频记录显示了裂纹的形成和干燥边界在水平方向上的扩展。通过重量分析法测量的干燥曲线显示了在每个干燥阶段胶乳的干燥速率和水含量。此外，我们发现，颗粒尺寸的影响堆积和开裂现象显着。OCT-重量-视频法是研究水性胶乳体系干燥过程的一种通用和可靠的方法。该方法可用于胶体的基础研究和工业胶乳产品的评价。
Latex, an aqueous dispersion of sub-micron polymer particles, is widely used as polymer binder in waterborne coatings and adhesives. Drying of a latex is inhomogeneous, during which the spatial distribution of particles is non-uniform and changes with time, usually resulting in a compromise of the integrity of a dried film. To study drying inhomogeneity of latex, we developed a system integrating optical coherence tomography (OCT) with gravimetric and video analysis (OCT-Gravimetry-Video method) to non-destructively monitor the drying process of non-film-forming latexes consisting of hard polystyrene spheres over time. OCT structural and speckle images of the latex’s internal structure show the packing process of particles, the detachment of latex and the formation of apparent shear bands in cross-sectional views. Video recordings show the formation of cracks and the propagation of the drying boundary in the horizontal direction. The drying curve, measured by gravimetry, shows the drying rate and the water content of the latex at each drying stage. Furthermore, we find that the particle size affects packing and cracking phenomena remarkably. The OCT-Gravimetry-Video method serves as a general and robust approach to investigate the drying process of waterborne latex system. This method can be employed for fundamental studies of colloids and for evaluations of industrial latex products.
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影响因子：
6.6
作者：
Brun, A.;Dihang, H.;Brunel, L.
通讯作者：
Brunel, L.
影响因子：
5.5
作者：
KEDDIE, JL;MEREDITH, P;DONALD, AM
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DONALD, AM
影响因子：
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Johannsmann, Diethelm
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2.7
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Loussert, Charles;Bouchaudy, Anne;Salmon, Jean-Baptiste
通讯作者：
Salmon, Jean-Baptiste
影响因子：
41.2
作者：
Donald, AM
通讯作者：
Donald, AM