Polystyrene Foaming at High Pressure Drop Rates

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• 作者：Daniele Tammaro ; Antonello Astarita ; Ernesto Di Maio ; Salvatore Iannace
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2016
• 出版时间：May 18, 2016
• 年：2016
• 卷：55
• 期：19
• 页码：5696-5701
• 全文大小：344K
• 年卷期：0
• ISSN：1520-5045

文摘

We studied the foaming of polystyrene with CO₂ as the physical blowing agent at large pressure drop rates (PDRs) and at different foaming temperatures, with a novel batch foaming apparatus, capable of reaching PDRs as high as 500 MPa/s (in the underlying literature, the maximum so far achieved is 100 MPa/s). Results show that, at each foaming temperature, the number of nucleated bubbles per unit initial volume (N) linearly increases with PDR in a bilogarithmic scale, with slopes increasing with the temperature. The effect of talc as the nucleating agent was also investigated. Furthermore, a phenomenological model was developed and utilized to predict N at PDRs not experimentally accessible. The approach was validated and a good agreement with the experimental data was obtained.