Carbon dioxide foaming of glassy polymers | Zendy

Wessling M. | Zendy; Borneman Z. | Zendy; Van Den Boomgaard Th. | Zendy; Smolders C. A. | Zendy

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Carbon dioxide foaming of glassy polymers

Author(s) -

Wessling M.,

Borneman Z.,

Van Den Boomgaard Th.,

Smolders C. A.

Publication year - 1994

Publication title -

journal of applied polymer science

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.575

H-Index - 166

eISSN - 1097-4628

pISSN - 0021-8995

DOI - 10.1002/app.1994.070531112

Subject(s) - polymer , nucleation , materials science , supersaturation , glass transition , carbon dioxide , porosity , chemical engineering , carbon fibers , glassy carbon , homogeneous , blowing agent , composite material , chemistry , thermodynamics , organic chemistry , polyurethane , physics , composite number , engineering , cyclic voltammetry , electrode , electrochemistry

The mechanism of foaming a glassy polymer using sorbed carbon dioxide is studied in detail. A glassy polymer supersaturated with nitrogen forms a microcellular foam, if the polymer is quickly heated above its glass transition temperature. A glassy polymer supersaturated with CO 2 forms this foam‐like structure at much lower temperatures which indicates the T g ‐depressing effect of CO 2 . Having this interpretation in mind, the overall sample morphology, i.e., a porous foam enclosed by dense outer skins, can be completely explained. The dense skins, however, are not homogeneous but show a nodular structure when analyzed by SEM and AFM. Foaming experiments with samples having a different thermal history suggest that the nucleation mechanism underlying the foaming process is heterogeneous in nature. © 1994 John Wiley & Sons, Inc.

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