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Evolution of microphase separation with variations of segments of sequence-controlled multiblock copolymers

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Zhang, Junliang, Deubler, Robert, Hartlieb, Matthias, Martin, Liam T., Tanaka, Joji, Patyukova, Elena, Topham, Paul D., Schacher, Felix H. and Perrier, Sébastien (2017) Evolution of microphase separation with variations of segments of sequence-controlled multiblock copolymers. Macromolecules, 50 (18). pp. 7380-7387. doi:10.1021/acs.macromol.7b01831

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Official URL: http://dx.doi.org/10.1021/acs.macromol.7b01831

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Abstract

Multiblock copolymers (MBCPs) are an emerging class of materials that are becoming more accessible in recent years. However, to date there is still a lack of fundamental understanding of their physical properties. In particular, the glass transition temperature (Tg) which is known to be affected by the phase separation has not been well characterized experimentally. To this end, we report the first experimental study on the evolution of the Tgs and the corresponding phase separation of linear MBCPs with increasing number of blocks while keeping the overall degree of polymerization (DP) constant (DP = 200). Ethylene glycol methyl ether acrylate (EGMEA) and tert-butyl acrylate (tBA) were chosen as monomers for reversible addition–fragmentation chain transfer polymerization to synthesize MBCPs. We found the Tgs (as measured by differential scanning calorimetry) of EGMEA and tBA segments within the MCBPs to converge with increasing number of blocks and decreasing block length, correlating with the loss of the heterogeneity as observed from small-angle X-ray scattering (SAXS) analysis. The Tgs of the multiblock copolymers were also compared to the Tgs of the polymer blends of the corresponding homopolymers, and we found that Tgs of the polymer blends were similar to those of the respective homopolymers, as expected. SAXS experiments further demonstrated microphase separation of multiblock copolymers. This work demonstrates the enormous potential of multiblock architectures to tune the physical properties of synthetic polymers, by changing their glass transition temperature and their morphologies obtained from microphase separation, with domain sizes reaching under 10 nm.

Item Type: Journal Article
Subjects: Q Science > QC Physics
Q Science > QD Chemistry
T Technology > TP Chemical technology
Divisions: Faculty of Science > Chemistry
Library of Congress Subject Headings (LCSH): Block copolymers, Addition polymerization, Polymers -- Microstructure
Journal or Publication Title: Macromolecules
Publisher: American Chemical Society
ISSN: 0024-9297
Official Date: 14 September 2017
Dates:
DateEvent
14 September 2017Published
14 September 2017Accepted
Volume: 50
Number: 18
Page Range: pp. 7380-7387
DOI: 10.1021/acs.macromol.7b01831
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Restricted or Subscription Access
RIOXX Funder/Project Grant:
Project/Grant IDRIOXX Funder NameFunder ID
HA 7725/1-1Deutsche Forschungsgemeinschafthttp://dx.doi.org/10.13039/501100001659
SPP1568, SCHA1640/10Deutsche Forschungsgemeinschafthttp://dx.doi.org/10.13039/501100001659
B515Fredrik och Ingrid Thurings Stiftelsehttp://dx.doi.org/10.13039/501100003186
EP/F500378Engineering and Physical Sciences Research Councilhttp://dx.doi.org/10.13039/501100000266
704459Horizon 2020 Framework Programmehttp://dx.doi.org/10.13039/100010661
Wolfson Merit AwardRoyal Societyhttp://dx.doi.org/10.13039/501100000288
UNSPECIFIEDMonash-Warwick AllianceUNSPECIFIED

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