Phase behavior of polystyrene-block-poly(n-butyl-ran-n-hexyl) methacrylate copolymers
SCIE
SCOPUS
- Title
- Phase behavior of polystyrene-block-poly(n-butyl-ran-n-hexyl) methacrylate copolymers
- Authors
- Moon, HC; Han, SH; Kim, JK; Li, GH; Cho, J
- Date Issued
- 2008-09-23
- Publisher
- AMER CHEMICAL SOC
- Abstract
- The phase behavior of symmetric polystyrene-block-poly(n-butyl-ran-n-hexyl) methacrylate copolymers (PS-b-Pn(B-r-H)MA) with various molecular weights was investigated by small-angle X-ray scattering (SAXS), rheometry, polarized optical microscopy (POM), and static birefringence. PS-b-PnBMA exhibited a lower disorder-to-order transition (LDOT), whereas PS-b-PnHMA exhibited an order-to-disorder transition (UODT). However, when a random copolymer of Pn(B-r-H)MA was used as one of the blocks, PS-b-Pn(B-r-H)MA showed closed-loop phase behavior having both LDOT and UODT, which was seen in PS-b-poly(n-pentyl methacrylate) copolymer, when the total molecular weight was judiciously controlled. The phase behavior change by including a random copolymer was explained by an argument based on a compressible random phase approximation. We also found that the pressure coefficient of both transition temperatures of PS-b-Pn(B-r H)MA was Much larger than that of neat PS-b-PnBMA and PS-b-PnHMA.
- Keywords
- INTERACTING BLOCK-COPOLYMERS; CRITICAL ORDERING TRANSITION; LATTICE CLUSTER THEORY; X-RAY-SCATTERING; DIBLOCK COPOLYMERS; POLYMER BLENDS; MICROPHASE SEPARATION; INTERACTION PARAMETER; MISCIBILITY; MELTS
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/22505
- DOI
- 10.1021/MA800645U
- ISSN
- 0024-9297
- Article Type
- Article
- Citation
- MACROMOLECULES, vol. 41, no. 18, page. 6793 - 6799, 2008-09-23
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- There are no files associated with this item.
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