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Title: Synthesis and Morphological Behavior of Model 6-Miktoarm Star Copolymers, PS(P2MP)5, of Styrene (S) and 2-Methyl-1,3-Pentadiene (P2MP)

Abstract

Three 6-miktoarm star (6{mu}-star) copolymers [PS(P2MP){sub 5}] of styrene (S) and 2-methyl-1,3-pentadiene (2MP) were synthesized by anionic polymerization and controlled chlorosilane chemistry, using high vacuum techniques. In all cases [M{sub w} = 103 kg/mol, [S] = 44% (v/v); M{sub w} = 91.1 kg/mol, [S] = 53% (v/v); M{sub w} = 224 kg/mol, [S] = 92% (v/v)] the P2MP exhibited high 1,4-microstructure ({approx}99%). Molecular characterization (size-exclusion chromatography, membrane osmometry, low-angle laser light scattering, and NMR) revealed high molecular weight/composition homogeneity, and structural analysis (differential scanning calorimetry, transmission electron microscopy, and small-angle X-ray scattering) showed highly ordered patterns. The deviations from predictions based on Milner's morphological model are much more pronounced than that of PS(P2MP){sub 2} and PS(P2MP){sub 3} miktoarm stars, which we attribute to greater crowding of the arms for these highly branched molecules.

Authors:
; ; ; ;
Publication Date:
Research Org.:
Brookhaven National Laboratory (BNL) National Synchrotron Light Source
Sponsoring Org.:
Doe - Office Of Science
OSTI Identifier:
914134
Report Number(s):
BNL-78702-2007-JA
Journal ID: ISSN 0897-4756; CMATEX; TRN: US200804%%318
DOE Contract Number:  
DE-AC02-98CH10886
Resource Type:
Journal Article
Resource Relation:
Journal Name: Chem. Mater.; Journal Volume: 18
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; SYNTHESIS; COPOLYMERS; PENTADIENES; STYRENE; MICROSTRUCTURE; MOLECULAR WEIGHT; ORDER PARAMETERS; national synchrotron light source

Citation Formats

Mavroudis,A., Avgeropoulos, A., Hadjichristidis, N., Thomas, E., and Lohse, D. Synthesis and Morphological Behavior of Model 6-Miktoarm Star Copolymers, PS(P2MP)5, of Styrene (S) and 2-Methyl-1,3-Pentadiene (P2MP). United States: N. p., 2006. Web. doi:10.1021/cm052477l.
Mavroudis,A., Avgeropoulos, A., Hadjichristidis, N., Thomas, E., & Lohse, D. Synthesis and Morphological Behavior of Model 6-Miktoarm Star Copolymers, PS(P2MP)5, of Styrene (S) and 2-Methyl-1,3-Pentadiene (P2MP). United States. doi:10.1021/cm052477l.
Mavroudis,A., Avgeropoulos, A., Hadjichristidis, N., Thomas, E., and Lohse, D. Sun . "Synthesis and Morphological Behavior of Model 6-Miktoarm Star Copolymers, PS(P2MP)5, of Styrene (S) and 2-Methyl-1,3-Pentadiene (P2MP)". United States. doi:10.1021/cm052477l.
@article{osti_914134,
title = {Synthesis and Morphological Behavior of Model 6-Miktoarm Star Copolymers, PS(P2MP)5, of Styrene (S) and 2-Methyl-1,3-Pentadiene (P2MP)},
author = {Mavroudis,A. and Avgeropoulos, A. and Hadjichristidis, N. and Thomas, E. and Lohse, D.},
abstractNote = {Three 6-miktoarm star (6{mu}-star) copolymers [PS(P2MP){sub 5}] of styrene (S) and 2-methyl-1,3-pentadiene (2MP) were synthesized by anionic polymerization and controlled chlorosilane chemistry, using high vacuum techniques. In all cases [M{sub w} = 103 kg/mol, [S] = 44% (v/v); M{sub w} = 91.1 kg/mol, [S] = 53% (v/v); M{sub w} = 224 kg/mol, [S] = 92% (v/v)] the P2MP exhibited high 1,4-microstructure ({approx}99%). Molecular characterization (size-exclusion chromatography, membrane osmometry, low-angle laser light scattering, and NMR) revealed high molecular weight/composition homogeneity, and structural analysis (differential scanning calorimetry, transmission electron microscopy, and small-angle X-ray scattering) showed highly ordered patterns. The deviations from predictions based on Milner's morphological model are much more pronounced than that of PS(P2MP){sub 2} and PS(P2MP){sub 3} miktoarm stars, which we attribute to greater crowding of the arms for these highly branched molecules.},
doi = {10.1021/cm052477l},
journal = {Chem. Mater.},
number = ,
volume = 18,
place = {United States},
year = {Sun Jan 01 00:00:00 EST 2006},
month = {Sun Jan 01 00:00:00 EST 2006}
}