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首页> 外文期刊>Journal of Applied Polymer Science >Measurement of the Solubility and Diffusivity of Blowing Agents in Polystyrene
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Measurement of the Solubility and Diffusivity of Blowing Agents in Polystyrene

机译：发泡剂在聚苯乙烯中的溶解度和扩散度的测量

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摘要

The solubility and diffusivity of several gases in polystyrene (PS) and styrene acrylonitrile copolymer (SAN) were studied with the pressure, decay method. Data were collected for carbon dioxide, isobutane, and 1,1,1,2-tetrafluoroethane (R-134a) in PS and for R-134a in SAN. The temperature range was between 30 and 200 degrees C, and the gas pressures ranged from approximately 0.2 to 8.2 MPa. To cover these ranges, both the absolute and differential pressure decay methods were required. Henry's law was found to adequately represent all the gas solubilities. Isobutane and R-134a were found to have a plasticizing effect on PS and SAN; that is, the diffusivity increased significantly as the pressure (and mass uptake) increased. CO2 in PS had the highest diffusivity and lowest solubility and did not affect the diffusivity in PS over the pressure range studied.
机译：采用压力衰减法研究了几种气体在聚苯乙烯（PS）和苯乙烯丙烯腈共聚物（SAN）中的溶解度和扩散率。收集PS中的二氧化碳，异丁烷和1,1,1,2-四氟乙烷（R-1​​34a）以及SAN中的R-134a的数据。温度范围在30至200℃之间，并且气压在大约0.2至8.2MPa的范围内。为了覆盖这些范围，需要绝对压差法和压差衰减法。发现亨利定律足以代表所有的气体溶解度。已发现异丁烷和R-134a对PS和SAN具有增塑作用。也就是说，扩散率随着压力（和质量吸收）的增加而显着增加。在研究的压力范围内，PS中的CO2扩散率最高，溶解度最低，并且不影响PS中的扩散率。

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