Reference : Phase behavior of diblock copolymers between styrene and n-alkyl methacrylates
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Chemistry
Engineering, computing & technology : Materials science & engineering
http://hdl.handle.net/2268/15016
Phase behavior of diblock copolymers between styrene and n-alkyl methacrylates
English
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 mailto [University of Liège (ULg) > 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 > > >]
1-Dec-1998
Macromolecules
Amer Chemical Soc
31
24
8509-8516
Yes (verified by ORBi)
International
0024-9297
Washington
[en] block copolymer
[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.
Center for Education and Research on Macromolecules (CERM)
The National Science Foundation ; The DOE BES ; The MRSEC of the National Science Foundation
Researchers
http://hdl.handle.net/2268/15016
10.1021/ma981055c
http://pubs.acs.org/doi/pdf/10.1021/ma981055c

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