Abstract
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. 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 (ξIV/ξSI ≥ 2).
| Original language | English |
|---|---|
| Pages (from-to) | 7491-7499 |
| Number of pages | 9 |
| Journal | Macromolecules |
| Volume | 51 |
| Issue number | 19 |
| DOIs | |
| State | Published - Oct 9 2018 |
Funding
This research was supported by the Laboratory Directed Research and Development Program of Oak Ridge National Laboratory, managed by UT-Battelle, LLC, for the U.S. Department of Energy (DOE). The Research at Oak Ridge National Laboratory’s Spallation Neutron Source was sponsored by the Scientific User Facilities Division, Office of Basic Energy Sciences, U.S. DOE. B.G.S., R.K., M.G., K.H., and W.W. acknowledge work performed at the Center for Nanophase Materials Science, which is a U.S. DOE Office of Science User Facility. H.K., D.M.Y., and T.P.R. were supported by the Air Force Offices of Scientific Research under Contract 16RT1602. M.M.L.A., W.W. and J.P.M. were supported by the Laboratory Directed Research and Development, Technology Innovation Program of ORNL, managed by UT-Battelle, LLC for the U.S. DOE. This research was supported by the Laboratory Directed Research and Development Program of Oak Ridge National Laboratory, managed by UT-Battelle, LLC, for the U.S. Department of Energy (DOE). The Research at Oak Ridge National Laboratory's Spallation Neutron Source was sponsored by the Scientific User Facilities Division, Office of Basic Energy Sciences, U.S. DOE. B.G.S., R.K., M.G., K.H., and W.W. acknowledge work performed at the Center for Nanophase Materials Science, which is a U.S. DOE Office of Science User Facility. H.K. D.M.Y., and T.P.R. were supported by the Air Force Offices of Scientific Research under Contract 16RT1602. M.M.L.A., W.W. and J.P.M. were supported by the Laboratory Directed Research and Development, Technology Innovation Program of ORNL, managed by UT-Battelle, LLC for the U.S. DOE.