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

Du Yeol Ryu; Dong Hyun Lee; Unyong Jeong; Sang Hyun Yun; Soojin Park; Kyoon Kwon; Byeong Hyeok Sohn; Taihyun Chang; Jin Kon Kim; Thomas P. Russell

doi:10.1021/ma049746y

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

Du Yeol Ryu, Dong Hyun Lee, Unyong Jeong, Sang Hyun Yun, Soojin Park, Kyoon Kwon, Byeong Hyeok Sohn, Taihyun Chang, Jin Kon Kim, Thomas P. Russell

Department of Chemical and Biomolecular Engineering

Research output: Contribution to journal › Article › peer-review

44 Citations (Scopus)

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.

Original language	English
Pages (from-to)	3717-3724
Number of pages	8
Journal	Macromolecules
Volume	37
Issue number	10
DOIs	https://doi.org/10.1021/ma049746y
Publication status	Published - 2004 May 18

All Science Journal Classification (ASJC) codes

Organic Chemistry
Polymers and Plastics
Inorganic Chemistry
Materials Chemistry

Access to Document

10.1021/ma049746y

Cite this

@article{d2e73d3424df4377a5a46f7a6cd8dcab,

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

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.",

author = "Ryu, {Du Yeol} and Lee, {Dong Hyun} and Unyong Jeong and Yun, {Sang Hyun} and Soojin Park and Kyoon Kwon and Sohn, {Byeong Hyeok} and Taihyun Chang and Kim, {Jin Kon} and Russell, {Thomas P.}",

year = "2004",

month = may,

day = "18",

doi = "10.1021/ma049746y",

language = "English",

volume = "37",

pages = "3717--3724",

journal = "Macromolecules",

issn = "0024-9297",

publisher = "American Chemical Society",

number = "10",

}

TY - JOUR

T1 - Closed-loop phase behavior of polystyrene-block-poly(n-pentyl methacrylate) copolymers with various block length ratios

AU - Ryu, Du Yeol

AU - Lee, Dong Hyun

AU - Jeong, Unyong

AU - Yun, Sang Hyun

AU - Park, Soojin

AU - Kwon, Kyoon

AU - Sohn, Byeong Hyeok

AU - Chang, Taihyun

AU - Kim, Jin Kon

AU - Russell, Thomas P.

PY - 2004/5/18

Y1 - 2004/5/18

N2 - 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.

AB - 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.

UR - http://www.scopus.com/inward/record.url?scp=2542612289&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=2542612289&partnerID=8YFLogxK

U2 - 10.1021/ma049746y

DO - 10.1021/ma049746y

M3 - Article

AN - SCOPUS:2542612289

SN - 0024-9297

VL - 37

SP - 3717

EP - 3724

JO - Macromolecules

JF - Macromolecules

IS - 10

ER -

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

Abstract

All Science Journal Classification (ASJC) codes

Access to Document

Other files and links

Fingerprint

Cite this