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首页> 外文期刊>Journal of Applied Polymer Science >Water Diffusion into Transcrystalline Layers on Polypropylene
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Water Diffusion into Transcrystalline Layers on Polypropylene

机译：水扩散到聚丙烯的跨晶层中

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摘要

The diffusion constant of water through transcrystalline surface layers on isotactic polypropylene (i-PP_ is reported.A suitable experimental technique was developed,based on sorption or desorption measurements.The accompanying change in sample weight is detected by the corresponding change inmechanical resonance frequency.The facility allows investigation of the diffusion current parallel to as well as perpendicular to the sample surface.Tests with commercial polyethylene films revealed that reproductibility and reliability are better than 6%.The samples were prepared as thin films in which the transcrystalinity was controlled by use of several substrate materials and different thermal conditions during solidification of the melt.The water diffusion constant of finely spherulitic i-PP turned out to be 15.9 #mu#m~2/s;whereas the values for transcrystalline material amounted to 19.6 #mu#m~2/s parallel and between 12 and 10 #mu#m~2/s perpendicular to the film surface,depending on the actual supermolecular structure.These results are discussed with respect to the underlying transcrystalline texture and the texture of the amorphous percolation network.
机译：据报道，水在全同立构聚丙烯（i-PP_）上通过跨晶表面层的扩散常数。基于吸附或解吸测量，开发了一种合适的实验技术，通过相应的机械共振频率变化来检测样品重量的伴随变化。该设备可以研究平行于和垂直于样品表面的扩散电流。对商用聚乙烯薄膜的测试表明，其可重复性和可靠性均优于6％。将样品制成薄膜，通过使用熔体凝固过程中几种基材材料和不同的热条件。细球形i-PP的水扩散常数为15.9＃mu＃m〜2 / s;而反晶材料的水扩散常数为19.6＃mu＃m平行于薄膜的约2 / s，垂直于薄膜表面的距离在12至10＃mu＃m〜2 / s之间，具体取决于作用这些结果将针对潜在的跨晶织构和非晶渗滤网络的织构进行讨论。

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