CaltechAUTHORS
  A Caltech Library Service

Orientational Proliferation and Successive Twinning from Thermoreversible Hexagonal−Body-Centered Cubic Transitions

Lee, Hee Hyun and Jeong, Woon-Yong and Kim, Jin Kon and Ihn, Kyo Jin and Kornfield, Julia A. and Wang, Zhen-Gang and Qi, Shuyan (2002) Orientational Proliferation and Successive Twinning from Thermoreversible Hexagonal−Body-Centered Cubic Transitions. Macromolecules, 35 (3). pp. 785-794. ISSN 0024-9297. https://resolver.caltech.edu/CaltechAUTHORS:20170720-075310985

Full text is not posted in this repository. Consult Related URLs below.

Use this Persistent URL to link to this item: https://resolver.caltech.edu/CaltechAUTHORS:20170720-075310985

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.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1021/ma010951cDOIArticle
http://pubs.acs.org/doi/abs/10.1021/ma010951cPublisherArticle
ORCID:
AuthorORCID
Kornfield, Julia A.0000-0001-6746-8634
Wang, Zhen-Gang0000-0002-3361-6114
Additional Information:© 2002 American Chemical Society. Received 31 May 2001. Published online 3 January 2002. Published in print 1 January 2002 We acknowledge helpful discussions with Professors T. Hashimoto, T. Lodge, S. Okamoto, C. Y. Ryu, S. Sakurai and A. C. Shi. This work was supported by KOSEF (97-05-02-03-01-3), by the Applied Rheology Center governed by KOSEF (2000 G0202), by TND projects supported by the Ministry of Science and Technology (MOST) and by NSF (CTS-9729443) and AFOSR (LC MURI). Synchrotron SAXS at the PLS (3C2 and 4C1 beam lines) was supported by MOST and Pohang Iron and Steel Co. (POSCO). Vector 4111 was kindly provided by Professor C. D. Han at the University of Akron.
Funders:
Funding AgencyGrant Number
Korea Science and Engineering Foundation97-05-02-03-01-3
Korea Science and Engineering Foundation2000 G0202
NSFCTS-9729443
Air Force Office of Scientific Research (AFOSR)UNSPECIFIED
Pohang Iron and Steel co.UNSPECIFIED
Ministry of Science and Technology (Korea)UNSPECIFIED
Issue or Number:3
Record Number:CaltechAUTHORS:20170720-075310985
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20170720-075310985
Official Citation:Orientational Proliferation and Successive Twinning from Thermoreversible Hexagonal−Body-Centered Cubic Transitions Hee Hyun Lee, Woon-Yong Jeong, Jin Kon Kim, Kyo Jin Ihn, Julia A. Kornfield, Zhen-Gang Wang, and Shuyan Qi Macromolecules 2002 35 (3), 785-794 DOI: 10.1021/ma010951c
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:79232
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:20 Jul 2017 18:31
Last Modified:03 Oct 2019 18:17

Repository Staff Only: item control page