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Title: Double-Gyroid Network Morphology in Tapered Diblock Copolymers

Abstract

We report the formation of a double-gyroid network morphology in normal-tapered poly(isoprene-b-isoprene/styrene-b-styrene) [P(I-IS-S)] and inverse-tapered poly(isoprene-b-styrene/isoprene-b-styrene) [P(I-SI-S)] diblock copolymers. Our tapered diblock copolymers with overall poly(styrene) volume fractions of 0.65 (normal-tapered) and 0.67 (inverse-tapered), and tapered regions comprising 30 vol % of the total polymer, were shown to self-assemble into the double-gyroid network morphology through a combination of small-angle X-ray scattering (SAXS) and transmission electron microscopy (TEM). The block copolymers were synthesized by anionic polymerization, where the tapered region between the pure poly(isoprene) and poly(styrene) blocks was generated using a semibatch feed with programmed syringe pumps. The overall composition of these tapered copolymers lies within the expected network-forming region for conventional poly(isoprene-b-styrene) [P(I-S)] diblock copolymers. Dynamic mechanical analysis (DMA) clearly demonstrated that the order-disorder transition temperatures (T{sub ODT}'s) of the network-forming tapered block copolymers were depressed when compared to the T{sub ODT} of their nontapered counterpart, with the P(I-SI-S) showing the greater drop in T{sub ODT}. These results indicate that it is possible to manipulate the copolymer composition profile between blocks in a diblock copolymer, allowing significant control over the T{sub ODT}, while maintaining the ability to form complex network structures.

Authors:
; ; ; ; ;
Publication Date:
Research Org.:
Brookhaven National Lab. (BNL), Upton, NY (United States)
Sponsoring Org.:
USDOE SC OFFICE OF SCIENCE (SC)
OSTI Identifier:
1041996
Report Number(s):
BNL-97674-2012-JA
Journal ID: ISSN 0024-9297; TRN: US201212%%407
DOE Contract Number:  
DE-AC02-98CH10886
Resource Type:
Journal Article
Journal Name:
Macromolecules
Additional Journal Information:
Journal Volume: 44; Journal Issue: 10; Journal ID: ISSN 0024-9297
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; COPOLYMERS; MORPHOLOGY; POLYMERIZATION; SCATTERING; TRANSITION TEMPERATURE; TRANSMISSION ELECTRON MICROSCOPY

Citation Formats

Roy, R, Park, J, Young, W, Mastroianni, S, Tureau, M, and III, T Epps. Double-Gyroid Network Morphology in Tapered Diblock Copolymers. United States: N. p., 2011. Web. doi:10.1021/ma1025847.
Roy, R, Park, J, Young, W, Mastroianni, S, Tureau, M, & III, T Epps. Double-Gyroid Network Morphology in Tapered Diblock Copolymers. United States. doi:10.1021/ma1025847.
Roy, R, Park, J, Young, W, Mastroianni, S, Tureau, M, and III, T Epps. Sat . "Double-Gyroid Network Morphology in Tapered Diblock Copolymers". United States. doi:10.1021/ma1025847.
@article{osti_1041996,
title = {Double-Gyroid Network Morphology in Tapered Diblock Copolymers},
author = {Roy, R and Park, J and Young, W and Mastroianni, S and Tureau, M and III, T Epps},
abstractNote = {We report the formation of a double-gyroid network morphology in normal-tapered poly(isoprene-b-isoprene/styrene-b-styrene) [P(I-IS-S)] and inverse-tapered poly(isoprene-b-styrene/isoprene-b-styrene) [P(I-SI-S)] diblock copolymers. Our tapered diblock copolymers with overall poly(styrene) volume fractions of 0.65 (normal-tapered) and 0.67 (inverse-tapered), and tapered regions comprising 30 vol % of the total polymer, were shown to self-assemble into the double-gyroid network morphology through a combination of small-angle X-ray scattering (SAXS) and transmission electron microscopy (TEM). The block copolymers were synthesized by anionic polymerization, where the tapered region between the pure poly(isoprene) and poly(styrene) blocks was generated using a semibatch feed with programmed syringe pumps. The overall composition of these tapered copolymers lies within the expected network-forming region for conventional poly(isoprene-b-styrene) [P(I-S)] diblock copolymers. Dynamic mechanical analysis (DMA) clearly demonstrated that the order-disorder transition temperatures (T{sub ODT}'s) of the network-forming tapered block copolymers were depressed when compared to the T{sub ODT} of their nontapered counterpart, with the P(I-SI-S) showing the greater drop in T{sub ODT}. These results indicate that it is possible to manipulate the copolymer composition profile between blocks in a diblock copolymer, allowing significant control over the T{sub ODT}, while maintaining the ability to form complex network structures.},
doi = {10.1021/ma1025847},
journal = {Macromolecules},
issn = {0024-9297},
number = 10,
volume = 44,
place = {United States},
year = {2011},
month = {12}
}