Berlin 2018 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 33: Poster Session III
CPP 33.41: Poster
Dienstag, 13. März 2018, 14:00–16:00, Poster C
Effect of C60 on the Morphology of Strongly Segregated ABC Miktoarm Terpolymers — •Matthias M.L. Arras1, Hyeyoung Kim2, Monojoy Goswami1, Hong Kunlun1, Bobby G. Sumpter1, Thomas P. Russell2,3, and Gregory S. Smith1 — 1Oak Ridge National Lab, Oak Ridge, USA — 2University of Massachusetts Amherst, USA — 3Lawrence Berkeley National Lab, Berkeley, USA
We investigated the effect of C60 nanoparticles on a series of poly(styrene), poly(isoprene), poly(2-vinylpyridine) (PS-PI-P2VP) miktoarms by small angle scattering. To this end, we synthesized PS-PI-P2VP with symmetric PS and PI blocks and varied the degree of polymerization for P2VP. We denote the ratio between the volume fraction of P2VP and PS (or PI) as α. C60 addition leads to a reduction in the repeat period due, more than likely, to chain relaxation of the arms of the miktoarm terpolymer, in the hierarchical lamellar microdomain morphology (HLM) which forms for α>2. In contrast, in a sample with a tessellated morphology (TM) at short P2VP chains (α<1), we find the opposite behavior, and the repeat period expands dramatically. We explain these distinct differences with the stability of the HLM (observed for 2>α>4) which is robust and insensitve to configurational changes. In contrast, at all-symmetric conditions α=1 and below α<1 many TMs in close proximity are reported which means the morphology is susceptible to changes.
This research used resources at the Spallation Neutron Source, a DOE Office of Science User Facility operated by ORNL. HK & TR were supported by AFOSR (16RT1602) and ARO (W911NF-17-1-0003).