Orientational proliferation and successive twinning from thermoreversible hexagonal-body-centered cubic transitions
SCIE
SCOPUS
- Title
- Orientational proliferation and successive twinning from thermoreversible hexagonal-body-centered cubic transitions
- Authors
- Lee, HH; Jeong, WY; Kim, JK; Ihn, KJ; Kornfield, JA; Wang, ZG; Qi, SY
- Date Issued
- 2002-01-29
- Publisher
- AMER CHEMICAL SOC
- Abstract
- The deterministic proliferation of the orientation of hexagonally packed cylinders (HEX) from the twinned body-centered cubic (BCC) phase is investigated by synchrotron small-angle X-ray scattering (SAXS) and rheo-optical methods for di- and triblock copolymers of styrene and isoprene (SI and SIS). Repeated heating and cooling cycles starting from an initially aligned HEX produce a proliferation of cylinder orientations from successively twinned BCC states. The evolution of the orientation distribution of HEX cylinders produces a decrease in the birefringence and increase in the modulus with each successive generation. The cylinder axes of the degenerate HEX states coincide with the <111> directions of the twinned BCC due to the epitaxial growth of cylinders from the twinned BCC. The distribution of the cylinder axes of the degenerate HEX states among the <111> directions of the twinned BCC is found to be affected by memory of the prior HEX state, which decays with annealing time in the BCC state.
- Keywords
- ORDER-DISORDER TRANSITIONS; DIBLOCK COPOLYMER MELTS; SIS BLOCK-COPOLYMERS; ANISOTROPIC FLUCTUATIONS; SPHERE TRANSITION; VISCOELASTICITY; POLYISOPRENE; POLYSTYRENE; KINETICS; CYLINDER
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/19222
- DOI
- 10.1021/MA010951C
- ISSN
- 0024-9297
- Article Type
- Article
- Citation
- MACROMOLECULES, vol. 35, no. 3, page. 785 - 794, 2002-01-29
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