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Studies on the 3-Lamellar Morphology of Miktoarm Terpolymers

Journal Article · · Macromolecules
 [1];  [2];  [3];  [4];  [1];  [5];  [6];  [3];  [6];  [4];  [2];  [7]
  1. Univ. of Massachusetts, Amherst, MA (United States). Dept. of Polymer Science and Engineering
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Large Scale Structures Group, Neutron Scattering Division
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Science (CNMS), and Computational Sciences and Engineering Division; Univ. of Tennessee, Knoxville, TN (United States). Dept. of Mathematics
  4. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Science (CNMS)
  5. Technical Univ. of Denmark, Lyngby (Denmark). Dept. of Micro- and Nanotechnology
  6. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Science (CNMS), and Computational Sciences and Engineering Division
  7. Univ. of Massachusetts, Amherst, MA (United States). Dept. of Polymer Science and Engineering; Beijing Univ. of Chemical Technology, Bejing (China). Beijing Advanced Innovation Center for Soft Matter Science and Engineering
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The morphologies of ABC miktoarm star terpolymer consisting of polystyrene (PS), polyisoprene (PI), and poly(2-vinylpyridine) (P2VP) were studied by combining small-angle neutron and X-ray scattering (SANS and SAXS) and transmission electron microscopy. Here we find that this system displays a rich morphological behavior including an alternate lamellar (ALT.LAM), cylinder in undulated lamellar (CYLULAM), and 3-lamellar (LAM-3) phase. While the SAXS data alone were insufficient to conclusively differentiate between possible phases, we show that the use of selective deuteration and SANS is essential to unambiguously identify the morphology. In particular, the primary peak in SANS for the miktoarm polymer containing deuterated PS was found to be lower than the next two higher order peaks. Such an unusual scattering pattern for a lamellar morphology was verified by self-consistent field theory calculations when the relative strength of the interaction between PI–P2VP over PS–PI is equal to or greater than 2 (χIV/χSI ≥ 2).

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1482444
Alternate ID(s):
OSTI ID: 1871131
Journal Information:
Macromolecules, Journal Name: Macromolecules Journal Issue: 19 Vol. 51; ISSN 0024-9297
Publisher:
American Chemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English

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36 MATERIALS SCIENCE