BROWSE

Related Researcher

Author's Photo

Park, Soojin
Nano-Functional Materials Lab
Research Interests
  • Block Copolymers, nanostructured materials for Lithium-Ion batteries, wearable and stretchable energy storage applications

ITEM VIEW & DOWNLOAD

Closed-loop phase behavior of polystyrene-block-poly(n-pentyl methacrylate) copolymers with various block length ratios

Cited 40 times inthomson ciCited 41 times inthomson ci
Title
Closed-loop phase behavior of polystyrene-block-poly(n-pentyl methacrylate) copolymers with various block length ratios
Author
Ryu, DYLee, DHJeong, UYun, SHPark, SoojinKwon, KSohn, BHChang, TKim, JKRussell, TP
Keywords
Block length;  Closed-loop;  Disorder-to-order transition;  Phase behavior
Issue Date
2004-05
Publisher
AMER CHEMICAL SOC
Citation
MACROMOLECULES, v.37, no.10, pp.3717 - 3724
Abstract
The phase behavior of polystyrene-block-poly(n-pentyl methacrylate) copolymers [PS-PnPMA] having various block length ratios was investigated by rheology, transmission electron microscopy (TEM), and small-angle X-ray scattering (SAXS). All of the PS-PnPMA exhibited two transitions: the lower disorder-to-order transition (LDOT) and upper order-to-disorder transition (UODT) occurring at a lower and higher temperature, respectively. Thus, PS-PnPMA is characterized by a closed-loop type of phase behavior. As the volume fraction of PS in PS-PnPMA was decreased from 0.5 to 0.23, the microdomains observed between the LDOT and UODT changed from lamellae (LAM) to hexagonally packed cylinders (HEX) and finally to body-centered-cubic spheres (BCC), similar to other block copolymers exhibiting only an order-to-disorder transition. The rheological properties depended strongly on the type of microdomains within the closed-loop. The storage and loss moduli (G′ and G″) within the closed loop are the highest for a PS-PnPMA having a BCC morphology, then HEX morphology, and the lowest for LAM morphology.
URI
https://scholarworks.unist.ac.kr/handle/201301/6555
DOI
10.1021/ma049746y
ISSN
0024-9297
Appears in Collections:
ECHE_Journal Papers
Files in This Item:
There are no files associated with this item.

find_unist can give you direct access to the published full text of this article. (UNISTARs only)

Show full item record

qrcode

  • mendeley

    citeulike

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

MENU