Mechanism of film formation of latices
Mechanism of film formation of latices
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乳胶成膜机理
DOI：
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发表时间：
1970
期刊：
影响因子：
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通讯作者：
J. Vanderhoff
中科院分区：
文献类型：
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作者：
J. Vanderhoff
提出了胶乳膜形成的以下机理。最初，乳胶粒子以特征布朗运动自由移动。随着水的蒸发，它们的运动变得更加受限，最终水-空气界面张力迫使它们在一个包装阵列中聚集在一起，它们的双层阻碍它们进一步相互接近。水的持续蒸发施加一个力来克服这种排斥，使得双层“破裂”并形成聚合物-聚合物接触。这使得聚合物-水界面张力发挥作用，以增强和补充水-空气界面张力。如果组合的力足以使聚合物球体变形，则它们形成连续的膜。该膜在老化时变得更加均匀;发生进一步的逐渐聚结，其速率取决于聚合物结构，并且在此期间任何不相容的物质渗出到表面。
The following mechanism is proposed for latex film formation. Initially, the latex particles move about freely, with characteristic Brownian motion. As the water evaporates, their motion becomes more restricted, and eventually the water-air interfacial tension forces them together in a packed array, with their double layers hindering their further mutual approach. The continued evaporation of the water exerts a force to overcome this repulsion, so that the double layers are ‘ruptured’ and a polymer-polymer contact is formed. This brings the polymer-water interfacial tension into play, to reinforce and complement the water-air interfacial tension. If the combined forces are sufficient to deform the polymer spheres, they form a continuous film. This film becomes more homogeneous upon ageing; there occurs a further gradual coalescence, the rate of which depends upon the polymer structure and during which any incompatible substance is exuded to the surface.