Polystyrene-poly(2-ethylhexylmethacrylate) block copolymers: Synthesis, bulk phase behavior, and thin film structure

Ha Kyung Kwon; Vanessa E. Lopez; Raleigh L. Davis; So Youn Kim; Adam B. Burns; Richard A. Register

doi:10.1016/j.polymer.2014.02.047

Polystyrene-poly(2-ethylhexylmethacrylate) block copolymers: Synthesis, bulk phase behavior, and thin film structure

Ha Kyung Kwon, Vanessa E. Lopez, Raleigh L. Davis, So Youn Kim, Adam B. Burns, Richard A. Register

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

9 Scopus citations

Abstract

Anionic polymerization was employed to synthesize well-defined diblock copolymers of polystyrene and poly(2-ethylhexylmethacrylate), PS-PEHMA. Diblock morphologies in bulk and in substrate-supported thin films were characterized by small-angle X-ray scattering (SAXS) and atomic force microscopy (AFM), respectively. PS-PEHMA diblocks exhibited thermotropic order-disorder transitions; one diblock showed a thermoreversible transition between lamellae and a higher-temperature morphology assigned as perforated lamellae. Unlike PS-poly(alkylmethacrylate) diblocks where the alkyl group is n-butyl or n-pentyl, PS-PEHMA diblocks showed a typical decreasing Flory interaction parameter with increasing temperature. Thin films of PS-cylinder-forming PS-PEHMA diblocks showed a strong preference for the cylinders to lie in the plane of the film; films of incommensurate thickness readily formed terraces. Films of commensurate thickness were easily aligned over macroscopic areas through the application of mechanical shear.

Original language	English (US)
Pages (from-to)	2059-2067
Number of pages	9
Journal	Polymer
Volume	55
Issue number	8
DOIs	https://doi.org/10.1016/j.polymer.2014.02.047
State	Published - Apr 10 2014

All Science Journal Classification (ASJC) codes

Organic Chemistry
Polymers and Plastics
Materials Chemistry

Keywords

Block copolymer
Phase behavior
Thin film

Access to Document

10.1016/j.polymer.2014.02.047

Cite this

@article{686d7322bcb84efbbcf18e9e4c31616f,

title = "Polystyrene-poly(2-ethylhexylmethacrylate) block copolymers: Synthesis, bulk phase behavior, and thin film structure",

abstract = "Anionic polymerization was employed to synthesize well-defined diblock copolymers of polystyrene and poly(2-ethylhexylmethacrylate), PS-PEHMA. Diblock morphologies in bulk and in substrate-supported thin films were characterized by small-angle X-ray scattering (SAXS) and atomic force microscopy (AFM), respectively. PS-PEHMA diblocks exhibited thermotropic order-disorder transitions; one diblock showed a thermoreversible transition between lamellae and a higher-temperature morphology assigned as perforated lamellae. Unlike PS-poly(alkylmethacrylate) diblocks where the alkyl group is n-butyl or n-pentyl, PS-PEHMA diblocks showed a typical decreasing Flory interaction parameter with increasing temperature. Thin films of PS-cylinder-forming PS-PEHMA diblocks showed a strong preference for the cylinders to lie in the plane of the film; films of incommensurate thickness readily formed terraces. Films of commensurate thickness were easily aligned over macroscopic areas through the application of mechanical shear.",

keywords = "Block copolymer, Phase behavior, Thin film",

author = "Kwon, {Ha Kyung} and Lopez, {Vanessa E.} and Davis, {Raleigh L.} and Kim, {So Youn} and Burns, {Adam B.} and Register, {Richard A.}",

note = "Funding Information: This work was generously supported by the National Science Foundation , through the Materials Research Science and Engineering Center Program (Princeton Center for Complex Materials, DMR-0819860) and the Partnership for Research and Education in Materials Program (to California State University – Northridge, DMR-1205734). Additional support was provided to H.K.K. by the Lidow Senior Thesis Fund at Princeton University . The authors thank Aditya Koppikar for careful d n /d c measurements on PS and PEHMA solutions. ",

year = "2014",

month = apr,

day = "10",

doi = "10.1016/j.polymer.2014.02.047",

language = "English (US)",

volume = "55",

pages = "2059--2067",

journal = "Polymer",

issn = "0032-3861",

publisher = "Elsevier BV",

number = "8",

}

TY - JOUR

T1 - Polystyrene-poly(2-ethylhexylmethacrylate) block copolymers

T2 - Synthesis, bulk phase behavior, and thin film structure

AU - Kwon, Ha Kyung

AU - Lopez, Vanessa E.

AU - Davis, Raleigh L.

AU - Kim, So Youn

AU - Burns, Adam B.

AU - Register, Richard A.

N1 - Funding Information: This work was generously supported by the National Science Foundation , through the Materials Research Science and Engineering Center Program (Princeton Center for Complex Materials, DMR-0819860) and the Partnership for Research and Education in Materials Program (to California State University – Northridge, DMR-1205734). Additional support was provided to H.K.K. by the Lidow Senior Thesis Fund at Princeton University . The authors thank Aditya Koppikar for careful d n /d c measurements on PS and PEHMA solutions.

PY - 2014/4/10

Y1 - 2014/4/10

N2 - Anionic polymerization was employed to synthesize well-defined diblock copolymers of polystyrene and poly(2-ethylhexylmethacrylate), PS-PEHMA. Diblock morphologies in bulk and in substrate-supported thin films were characterized by small-angle X-ray scattering (SAXS) and atomic force microscopy (AFM), respectively. PS-PEHMA diblocks exhibited thermotropic order-disorder transitions; one diblock showed a thermoreversible transition between lamellae and a higher-temperature morphology assigned as perforated lamellae. Unlike PS-poly(alkylmethacrylate) diblocks where the alkyl group is n-butyl or n-pentyl, PS-PEHMA diblocks showed a typical decreasing Flory interaction parameter with increasing temperature. Thin films of PS-cylinder-forming PS-PEHMA diblocks showed a strong preference for the cylinders to lie in the plane of the film; films of incommensurate thickness readily formed terraces. Films of commensurate thickness were easily aligned over macroscopic areas through the application of mechanical shear.

AB - Anionic polymerization was employed to synthesize well-defined diblock copolymers of polystyrene and poly(2-ethylhexylmethacrylate), PS-PEHMA. Diblock morphologies in bulk and in substrate-supported thin films were characterized by small-angle X-ray scattering (SAXS) and atomic force microscopy (AFM), respectively. PS-PEHMA diblocks exhibited thermotropic order-disorder transitions; one diblock showed a thermoreversible transition between lamellae and a higher-temperature morphology assigned as perforated lamellae. Unlike PS-poly(alkylmethacrylate) diblocks where the alkyl group is n-butyl or n-pentyl, PS-PEHMA diblocks showed a typical decreasing Flory interaction parameter with increasing temperature. Thin films of PS-cylinder-forming PS-PEHMA diblocks showed a strong preference for the cylinders to lie in the plane of the film; films of incommensurate thickness readily formed terraces. Films of commensurate thickness were easily aligned over macroscopic areas through the application of mechanical shear.

KW - Block copolymer

KW - Phase behavior

KW - Thin film

UR - http://www.scopus.com/inward/record.url?scp=84897917477&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84897917477&partnerID=8YFLogxK

U2 - 10.1016/j.polymer.2014.02.047

DO - 10.1016/j.polymer.2014.02.047

M3 - Article

AN - SCOPUS:84897917477

SN - 0032-3861

VL - 55

SP - 2059

EP - 2067

JO - Polymer

JF - Polymer

IS - 8

ER -

Polystyrene-poly(2-ethylhexylmethacrylate) block copolymers: Synthesis, bulk phase behavior, and thin film structure

Abstract

All Science Journal Classification (ASJC) codes

Keywords

Access to Document

Other files and links

Fingerprint

Cite this