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Effect of chain architecture on the swelling and thermal response of star-shaped thermo-responsive (poly(methoxy diethylene glycol acrylate)-block-polystyrene)(3) block copolymer films
Zhejiang Sci Tech Univ, Natl Base Int Sci & Technol Cooperat Text & Consu, Engn Res Ctr Ecodyeing & Finishing Text, Key Lab Adv Text Mat & Mfg Technol,Minist Educ, Hangzhou 310018, Zhejiang, Peoples R China.;Tech Univ Munich, Phys Dept, Lehrstuhl Funkt Mat Fachgebiet Phys Weicher Mat, James Franck Str 1, D-85748 Garching, Germany..
Zhejiang Sci Tech Univ, Natl Base Int Sci & Technol Cooperat Text & Consu, Engn Res Ctr Ecodyeing & Finishing Text, Key Lab Adv Text Mat & Mfg Technol,Minist Educ, Hangzhou 310018, Zhejiang, Peoples R China..
Tech Univ Munich, Phys Dept, Lehrstuhl Funkt Mat Fachgebiet Phys Weicher Mat, James Franck Str 1, D-85748 Garching, Germany..
Tech Univ Munich, Phys Dept, Lehrstuhl Funkt Mat Fachgebiet Phys Weicher Mat, James Franck Str 1, D-85748 Garching, Germany..ORCID iD: 0000-0002-1046-1236
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2018 (English)In: Soft Matter, ISSN 1744-683X, E-ISSN 1744-6848, Vol. 14, no 31, p. 6582-6594Article in journal (Refereed) Published
Abstract [en]

The effect of chain architecture on the swelling and thermal response of thin films obtained from an amphiphilic three-arm star-shaped thermo-responsive block copolymer poly(methoxy diethylene glycol acrylate)-block-polystyrene ((PMDEGA-b-PS)(3)) is investigated by in situ neutron reflectivity (NR) measurements. The PMDEGA and PS blocks are micro-phase separated with randomly distributed PS nanodomains. The (PMDEGA-b-PS)(3) films show a transition temperature (TT) at 33 degrees C in white light interferometry. The swelling capability of the (PMDEGA-b-PS)(3) films in a D2O vapor atmosphere is better than that of films from linear PS-b-PMDEGA-b-PS triblock copolymers, which can be attributed to the hydrophilic end groups and limited size of the PS blocks in (PMDEGA-b-PS)(3). However, the swelling kinetics of the as-prepared (PMDEGA-b-PS)(3) films and the response of the swollen film to a temperature change above the TT are significantly slower than that in the PS-b-PMDEGA-b-PS films, which may be related to the conformation restriction by the star-shape. Unlike in the PS-b-PMDEGA-b-PS films, the amount of residual D2O in the collapsed (PMDEGA-b-PS)(3) films depends on the final temperature. It decreases from (9.7 +/- 0.3)% to (7.0 +/- 0.3)% or (6.0 +/- 0.3)% when the final temperatures are set to 35 degrees C, 45 degrees C and 50 degrees C, respectively. This temperature-dependent reduction of embedded D2O originates from the hindrance of chain conformation from the star-shaped chain architecture.

Place, publisher, year, edition, pages
Royal Society of Chemistry, 2018. Vol. 14, no 31, p. 6582-6594
National Category
Polymer Chemistry
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URN: urn:nbn:se:kth:diva-234604DOI: 10.1039/c8sm00965aISI: 000442269000016PubMedID: 30052259Scopus ID: 2-s2.0-85051264906OAI: oai:DiVA.org:kth-234604DiVA, id: diva2:1248257
Note

QC 20180914

Available from: 2018-09-14 Created: 2018-09-14 Last updated: 2018-09-14Bibliographically approved

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Roth, Stephan V.

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