The effects of foaming conditions on plasticized polyvinyl chloride foam morphology by using liquid carbon dioxide

2017 International Conference on Building Materials and Materials Engineering

材料科学;土木建筑工程

Chuaponpat, N.^1 ; Areerat, S.^2

Department of Chemical Engineering, Faculty of Engineering, Thailand^1

King Mongkut's Institute of Technology Ladkrabang, Bangkok

10520, Thailand^2

关键词: Foam morphology;    Foaming temperature;    Increasing temperatures;    Liquid carbon dioxide;    Physical blowing agents;    Polyvinyl chloride (PVC);    Research studies;    Soaking temperature;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/264/1/012018/pdf
DOI  :  10.1088/1757-899X/264/1/012018

来源: IOP

【 摘 要 】

This research studies the effects of foaming conditions by using liquid carbon dioxide (CO2) as a physical blowing agent on plasticized polyvinyl chloride (PVC) foam morphology. Foaming conditions were soaking time of 6, 10, and 12 h, foaming temperature of 70, 80, 90 °C for 5 s, at constant soaking temperature of -20 °C and pressure of 50 bar. Instantaneously increasing temperature was employed in this process for making foam structure. PVC foam samples were calculated percentage of shrinkage (Sh) by using density at before and after aging process at 30 °C for 12 h. When PVC samples were activated to form foam by using liquid CO2as a physical blowing agent, it reveal bimodal foam structure with a thick bubble wall (10-20 μm). Bubble diameter of PVC foam at longer soaking time is in the range of 40-60 μm and its at shorter soaking time reveal a large bubble that is in the range of 80-120 μm. Foaming condition slightly affected to bubble density that was in the narrow range of 106-108bubbles/cm3. PVC foam reveal reduction of density up to 65% when compare with PVC and Sh is less than 10%.