CO2 Induced Foaming Behavior of Polystyrene near the Glass Transition
This paper examines the effect of high-pressure carbon dioxide on the foaming process in polystyrene near the glass transition temperature and the foaming was studied using cylindrical high-pressure view cell with two optical windows. This technique has potential applications in the shape foaming of...
Saved in:
| Main Author: | |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Wiley
2017-01-01
|
| Series: | International Journal of Polymer Science |
| Online Access: | http://dx.doi.org/10.1155/2017/7804743 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1850236123389886464 |
|---|---|
| author | Salah Al-Enezi |
| author_facet | Salah Al-Enezi |
| author_sort | Salah Al-Enezi |
| collection | DOAJ |
| description | This paper examines the effect of high-pressure carbon dioxide on the foaming process in polystyrene near the glass transition temperature and the foaming was studied using cylindrical high-pressure view cell with two optical windows. This technique has potential applications in the shape foaming of polymers at lower temperatures, dye impregnation, and the foaming of polystyrene. Three sets of experiments were carried out at operating temperatures of 50, 70, and 100°C, each over a range of pressures from 24 to 120 bar. Foaming was not observed when the polymer was initially at conditions below Tg but was observed above Tg. The nucleation appeared to occur randomly leading to subsequent bubble growth from these sites, with maximum radius of 0.02–0.83 mm. Three models were applied on the foaming experimental data. Variable diffusivity and viscosity model (Model C) was applied to assess the experimental data with the WLF equation. The model shows very good agreement by using realistic parameter values. The expansion occurs by diffusion of a dissolved gas from the supersaturated polymer envelope into the bubble. |
| format | Article |
| id | doaj-art-149b5e9dec6341069c83dfae16473d72 |
| institution | OA Journals |
| issn | 1687-9422 1687-9430 |
| language | English |
| publishDate | 2017-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | International Journal of Polymer Science |
| spelling | doaj-art-149b5e9dec6341069c83dfae16473d722025-08-20T02:02:02ZengWileyInternational Journal of Polymer Science1687-94221687-94302017-01-01201710.1155/2017/78047437804743CO2 Induced Foaming Behavior of Polystyrene near the Glass TransitionSalah Al-Enezi0Petroleum Research Centre, Kuwait Institute for Scientific Research, Safat, KuwaitThis paper examines the effect of high-pressure carbon dioxide on the foaming process in polystyrene near the glass transition temperature and the foaming was studied using cylindrical high-pressure view cell with two optical windows. This technique has potential applications in the shape foaming of polymers at lower temperatures, dye impregnation, and the foaming of polystyrene. Three sets of experiments were carried out at operating temperatures of 50, 70, and 100°C, each over a range of pressures from 24 to 120 bar. Foaming was not observed when the polymer was initially at conditions below Tg but was observed above Tg. The nucleation appeared to occur randomly leading to subsequent bubble growth from these sites, with maximum radius of 0.02–0.83 mm. Three models were applied on the foaming experimental data. Variable diffusivity and viscosity model (Model C) was applied to assess the experimental data with the WLF equation. The model shows very good agreement by using realistic parameter values. The expansion occurs by diffusion of a dissolved gas from the supersaturated polymer envelope into the bubble.http://dx.doi.org/10.1155/2017/7804743 |
| spellingShingle | Salah Al-Enezi CO2 Induced Foaming Behavior of Polystyrene near the Glass Transition International Journal of Polymer Science |
| title | CO2 Induced Foaming Behavior of Polystyrene near the Glass Transition |
| title_full | CO2 Induced Foaming Behavior of Polystyrene near the Glass Transition |
| title_fullStr | CO2 Induced Foaming Behavior of Polystyrene near the Glass Transition |
| title_full_unstemmed | CO2 Induced Foaming Behavior of Polystyrene near the Glass Transition |
| title_short | CO2 Induced Foaming Behavior of Polystyrene near the Glass Transition |
| title_sort | co2 induced foaming behavior of polystyrene near the glass transition |
| url | http://dx.doi.org/10.1155/2017/7804743 |
| work_keys_str_mv | AT salahalenezi co2inducedfoamingbehaviorofpolystyreneneartheglasstransition |