气泡核是指原始微泡,也就是气体分子最初聚集的地方。塑料发泡过程的初始阶段是在塑料熔体或溶液中形成大量的气泡核,它对成型泡体的质量起着关键性的作用。当气体在溶液中达饱和限度而形成过饱和溶液时,气体又从溶液中逸出形成气泡,形成气泡的过程就是成核作用。这时,除聚合物液相外,又产生了新的气相,分散在聚合物中,成为泡沫。
PP泡孔结构的形成可分为形成气泡核、气泡的膨胀、泡体的固化定型三个阶段。
The formation of cell structure within PP set three stages: nucleation, expanding, solidifying and shaping .
NASA的科学家很清楚地证明潜水后或之间不应从事运动,因为可能诱发气泡核的产生。
NASA scientists have shown unequivocally that exercise should not be taken after or between dives due to the nucleation of bubbles.
经典成核理论假设气泡核的形成是在静态条件下发生的,它没有反映在口模流场中动态因素(拉伸、剪切等)对气泡成核的影响。
Because classical nucleation theory supposes that bubble formation is occurred under static state, it doesn't reflect the effects of dynamic factors on bubble nucleation, such as shear and elongation.
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