Thermodynamic characteristics of poly(cyclohexylethylene-b-ethylene-co-ethylethylene) block copolymers
- UMM
A series of poly(cyclohexylethylene-b-ethylene-co-ethylethylene) (C-E/E{sub E}) diblock copolymers containing approximately 50% by volume glassy C blocks and varying fraction (x) of E{sub E} repeat units, 0.07 {le} x {le} 0.90, was synthesized by anionic polymerization and catalytic hydrogenation. The effects of ethyl branch content on the melt state segment-segment ({chi}) interaction parameter and soft (E/E{sub E}) block crystallinity were studied. The percent crystallinity ranged from approximately 30% at x = 0.07 to 0% at about x {ge} 0.30, while the melting temperature changed from 101 C at x = 0.07 to 44 C at x = 0.28. Dynamic mechanical spectroscopy was employed to determine the order-disorder transition (ODT) temperatures, from which {chi} was calculated assuming the mean-field prediction ({chi}N{sub n}){sub ODT} = 10.5. Previously published results for the temperature dependent binary interaction parameters for C-E (x = 0.07), C-E{sub E} (x = 0.90), and E-E{sub E} (x = 0.07 and x = 0.90) fail to account for the quantitative x dependence of {chi}, based on a simple binary interaction model.
- Research Organization:
- Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
- Sponsoring Organization:
- NSFINDUSTRY
- OSTI ID:
- 1037894
- Journal Information:
- J. Polym. Sci. Pol. Phys., Vol. 48, Issue (5) ; 03, 2010; ISSN 0887-6266
- Country of Publication:
- United States
- Language:
- ENGLISH
Similar Records
Order-Disorder Transitions in Cross-Linked Block Copolymer Solids
Sub-5 nm Domains in Ordered Poly(cyclohexylethylene)-block-poly(methyl methacrylate) Block Polymers for Lithography.