Influence of carbon dioxide swelling on the closed-loop phase behavior of block copolymers
SCIE
SCOPUS
- Title
- Influence of carbon dioxide swelling on the closed-loop phase behavior of block copolymers
- Authors
- Lavery, KA; Sievert, JD; Watkins, JJ; Russell, TP; Ryu, DY; Kim, JK
- Date Issued
- 2006-09-19
- Publisher
- AMER CHEMICAL SOC
- Abstract
- The influence of carbon dioxide sorption on the closed- loop phase diagram of polystyrene- blockpoly( n- pentyl methacrylate) copolymers, PS- b- PnPMA, was investigated. Differential dilation of the constituent blocks was used to induce microphase separation of the PS- b- PnPMA. With increasing carbon dioxide loading an appreciable expansion in the size of the closed loop was found. At a carbon dioxide activity of 0.1 the upper order- to- disorder transition temperature ( UODT) was elevated by more than 20 C, whereas the lower disordertoorder transition temperature ( LDOT) was depressed by the same magnitude. This arises from the entropic nature of the closed- loop miscibility gap in this weakly interacting system, where microphase separation is driven by disparity in free volumes between dissimilar segments of the chain.
- Keywords
- CRITICAL ORDERING TRANSITION; DIBLOCK COPOLYMERS; POLYSTYRENE; PRESSURE; MELTS; COMPRESSIBILITY; SOLUBILITY; SEPARATION; DIFFUSION; POLYMERS
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/23834
- DOI
- 10.1021/MA060329Q
- ISSN
- 0024-9297
- Article Type
- Article
- Citation
- MACROMOLECULES, vol. 39, no. 19, page. 6580 - 6583, 2006-09-19
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- There are no files associated with this item.
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