Thermal transitions and foaming of a rubbery polymer, poly(ethylene-co-vinyl acetate-co-carbon monoxide), in carbon dioxide: Temperature scaling as a new approach for rational selection of foaming conditions

The foaming of a thermoplastic elastomer, poly(ethylene-co-vinyl acetate-co-carbon monoxide) with varying copolymer compositions was explored using CO2. Copolymers with 0, 10, and 20 wt% vinyl acetate and 10 wt% carbon monoxide, with the remainder being ethylene, designated as EVACO-0010, EVACO-1010...

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Bibliographic Details
Published in:The Journal of supercritical fluids 2023-12, Vol.203, p.106061, Article 106061
Main Authors: Sarver, Joseph A., Rhee, Dawn D., Van Horn, Grant A., Adams, Jake F., Kiran, Erdogan
Format: Article
Language:English
Subjects:
Carbon dioxide
Elastomers
Foaming
Temperature scaling
Thermal transitions
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Summary:The foaming of a thermoplastic elastomer, poly(ethylene-co-vinyl acetate-co-carbon monoxide) with varying copolymer compositions was explored using CO2. Copolymers with 0, 10, and 20 wt% vinyl acetate and 10 wt% carbon monoxide, with the remainder being ethylene, designated as EVACO-0010, EVACO-1010, and EVACO-2010 were evaluated. Melting and crystallization temperatures and their depression in CO2 were determined using high-pressure torsional braid analysis. Sorption and swelling assessments were carried out using a modified magnetic suspension balance. Foaming experiments were conducted at 200 bar near the depressed melting and crystallization temperatures. Foams with low (< 0.2 g/cm3) bulk densities of EVACO-1010 and EVACO-2010 were generated near their crystallization temperatures in CO2. A new concept of scaling the foaming temperature with respect to the melting or the crystallization temperature of the polymer in carbon dioxide was developed which provides an insightful new approach for the rational selection of polymer foaming conditions. [Display omitted] •Melting and crystallization temperatures of rubbery (ethylene-vinyl-acetate-carbon monoxide) copolymers in CO2 have been measured.•Sorption and swelling of rubbery copolymers in carbon dioxide have been measured.•Foaming of rubbery copolymers with carbon dioxide and rational selection of foaming conditions are presented.•A new concept of temperature scaling of foaming conditions with respect to melting or crystallization temperatures in CO2 is presented.
ISSN:0896-8446
DOI:10.1016/j.supflu.2023.106061