Lateral surface nonuniformities in drying latex films

Lateral surface nonuniformities in drying latex films
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干燥乳胶膜的侧面不均匀性

DOI:
10.1002/aic.11621
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发表时间:
2008
期刊:
影响因子:
3.7
通讯作者:
Gundabala V
Gundabala V
中科院分区:
工程技术3区
文献类型:
--
作者:
Gundabala V

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预测了在聚合物胶体(即乳胶)薄膜中常见的薄膜厚度不均匀的长度尺度。这一预测是通过研究干燥乳胶膜的稳定性行为来实现的。线性稳定性分析是在含有表面活性剂的均匀干燥乳胶膜的基础溶液上进行的。分析确定了两种长度尺度上的膜厚度不均匀性:长(毫米)范围(润滑理论)和短(微米)范围(非润滑理论)。在干燥过程中,蒸发和表面活性剂解吸是主要的不稳定机制。通过直接可视化和原子力显微镜的实验证据证实,在两个长度尺度上都存在不均匀性,这些不均匀性是初始颗粒体积分数、表面活性剂用量和解吸强度等参数的函数,而与干燥速率无关。©2008美国化学工程师学会,2008
The length scales of film thickness nonuniformities, commonly observed in polymer colloid (i.e., latex) films, are predicted. This prediction is achieved by investigating the stability behavior of drying latex films. A linear stability analysis is performed on a base solution representing a uniformly drying latex film containing a surfactant. The analysis identifies film thickness nonuniformities over two length scales: long (millimeter) range (from lubrication theory) and short (micrometer) range (from nonlubrication theory). Evaporation and surfactant desorption into the bulk film are identified as the primary destabilizing mechanisms during drying. Experimental evidence through direct visualization and atomic force microscopy confirm the existence of nonuniformities over both length scales, which are shown to be functions of parameters such as initial particle volume fraction, surfactant amount, and desorption strength, while being independent of drying rate. © 2008 American Institute of Chemical Engineers AIChE J, 2008
用原子力显微镜探测水性压敏粘合剂中的颗粒结构。
DOI: 10.1016/j.jcis.2006.11.036
发表时间: 2007
影响因子: 9.9
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DOI: --
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期刊:
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由于表面活性剂的作用,干燥乳胶膜变薄。
DOI: --
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