Article (Scientific journals)
Phase behavior of diblock copolymers between styrene and n-alkyl methacrylates
Ruzette, A. V. G.; Banerjee, P.; Mayes, A. M. et al.
1998In Macromolecules, 31 (24), p. 8509-8516
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Keywords :
block copolymer
Abstract :
[en] In contrast to most diblock copolymers which exhibit the classical upper critical ordering transition (UCOT), polystyrene-b-poly n-butyl methacrylatePS-b-PBMAhas been shown to undergo ordering upon heating through a lower critical ordering transition (LCOT). Here we report the phase behavior of a family of diblock copolymers formed from styrene and a homologous series of n-alkyl methacrylates, as determined by combined dynamic rheological testing and small-angle neutron scattering (SANS). It is shown that the shortest side chain methacrylates, with the exception of methyl methacrylate, exhibit the LCOT, while for side chains longer than n-butyl, the copolymers exhibit the classical UCOT behavior. Combined group contribution/lattice fluid model calculations of the solubility parameter and specific volume of the corresponding homopolymers qualitatively support these observations. The same calculations were further employed to molecularly design LCOT behavior into a new diblock material consisting of styrene and a random copolymer of methyl and lauryl methacrylate, denoted PS-b-P(MMA-r-LMA). The success of this approach suggests a simple semiquantitative method for predicting and designing the phase behavior of weakly interacting polymer pairs.
Research center :
Center for Education and Research on Macromolecules (CERM)
Disciplines :
Chemistry
Materials science & engineering
Author, co-author :
Ruzette, A. V. G.;  Massachusetts Institute of Technology, Cambridge, USA > Department of Materials Science and Engineering
Banerjee, P.;  Massachusetts Institute of Technology, Cambridge, USA > Department of Materials Science and Engineering
Mayes, A. M.;  Massachusetts Institute of Technology, Cambridge, USA > Department of Materials Science and Engineering
Pollard, M.;  University of Massachusetts, Amherst, USA > Polymer Science and Engineering Department
Russell, T. P.;  University of Massachusetts, Amherst, USA > Polymer Science and Engineering Department
Jérôme, Robert ;  Université de Liège - ULiège > Department of Chemistry > Center for Education and Research on Macromolecules (CERM)
Slawecki, T.;  National Institute of Standards and Technology, Gaithersburg, USA > Cold Neutron Research Facility
Hjelm, R.;  Los Alamos National Laboratory, USA > Los Alamos Neutron Science Center
Thiyagarajan, P.;  Argonne National Laboratory, USA > Intense Pulsed Neutron Source
Language :
English
Title :
Phase behavior of diblock copolymers between styrene and n-alkyl methacrylates
Publication date :
01 December 1998
Journal title :
Macromolecules
ISSN :
0024-9297
eISSN :
1520-5835
Publisher :
Amer Chemical Soc, Washington, United States - Washington
Volume :
31
Issue :
24
Pages :
8509-8516
Peer reviewed :
Peer Reviewed verified by ORBi
Funders :
The National Science Foundation
The DOE BES
The MRSEC of the National Science Foundation
Available on ORBi :
since 22 June 2009

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