PMID- 35614783
OWN - NLM
STAT- PubMed-not-MEDLINE
LR  - 20220526
IS  - 2161-1653 (Electronic)
IS  - 2161-1653 (Linking)
VI  - 4
IP  - 12
DP  - 2015 Dec 15
TI  - Influence of Confinement on the Chain Conformation of Cyclic 
      Poly(N-isopropylacrylamide).
PG  - 1362-1365
LID - 10.1021/acsmacrolett.5b00676 [doi]
AB  - In thin and ultrathin supported films, the conformations of flexible linear 
      polymer chains might be considerably confined, in particular, for film 
      thicknesses smaller than a few times the radius of gyration. For ring polymers in 
      solution or in melt, the radii of gyration are significantly reduced as compared 
      to those of their linear counterparts. We study here the influence of geometrical 
      confinement on the chain conformation of cyclic PNIPAM in silicon-supported 
      films. Measurements are performed by grazing incidence small angle neutron 
      scattering (GISANS). For all films, the component of the radius of gyration 
      parallel to the substrate, R(gc parallel), is significantly higher than the unperturbed 
      R(gc) determined under theta solvent or melt conditions. We attribute this effect 
      to a preferential selection of stretched PNIPAM ring conformations in thin films 
      and a preferential orientation of macromolecules parallel to the film interfaces 
      with the substrate and air.
FAU - Magerl, David
AU  - Magerl D
AD  - Lehrstuhl fur Funktionelle Materialien, Physik-Department, Technische Universitat 
      Munchen, James-Franck-Str. 1, 85748 Garching, Germany.
FAU - Philipp, Martine
AU  - Philipp M
AD  - Lehrstuhl fur Funktionelle Materialien, Physik-Department, Technische Universitat 
      Munchen, James-Franck-Str. 1, 85748 Garching, Germany.
FAU - Metwalli, Ezzeldin
AU  - Metwalli E
AD  - Lehrstuhl fur Funktionelle Materialien, Physik-Department, Technische Universitat 
      Munchen, James-Franck-Str. 1, 85748 Garching, Germany.
FAU - Gutfreund, Philipp
AU  - Gutfreund P
AD  - Institut Laue-Langevin, 71 avenue des Martyrs, 38000 Grenoble, France.
FAU - Qiu, Xing-Ping
AU  - Qiu XP
AD  - Faculty of Pharmacy and Department of Chemistry, Universite de Montreal, CP 6128 
      Succursale Centre Ville, Montreal QC H3C 3J7, Canada.
FAU - Winnik, Francoise M
AU  - Winnik FM
AD  - Faculty of Pharmacy and Department of Chemistry, Universite de Montreal, CP 6128 
      Succursale Centre Ville, Montreal QC H3C 3J7, Canada.
AD  - World Premier International (WPI) Research Center Initiative, International 
      Center for Materials Nanoarchitectonics (MANA) and National Institute for 
      Materials Science (NIMS), 1-1 Namiki, Tsukuba 305-0044, Japan.
FAU - Muller-Buschbaum, Peter
AU  - Muller-Buschbaum P
AD  - Lehrstuhl fur Funktionelle Materialien, Physik-Department, Technische Universitat 
      Munchen, James-Franck-Str. 1, 85748 Garching, Germany.
LA  - eng
PT  - Journal Article
DEP - 20151120
PL  - United States
TA  - ACS Macro Lett
JT  - ACS macro letters
JID - 101574672
SB  - IM
EDAT- 2015/12/15 00:00
MHDA- 2015/12/15 00:01
CRDT- 2022/05/26 01:25
PHST- 2022/05/26 01:25 [entrez]
PHST- 2015/12/15 00:00 [pubmed]
PHST- 2015/12/15 00:01 [medline]
AID - 10.1021/acsmacrolett.5b00676 [doi]
PST - ppublish
SO  - ACS Macro Lett. 2015 Dec 15;4(12):1362-1365. doi: 10.1021/acsmacrolett.5b00676. 
      Epub 2015 Nov 20.