Effect of the Degree of Hydrogen Bonding on Asymmetric Lamellar Microdomains in Binary Block Copolymer Blends

Jongheon Kwak, Sung Hyun Han, Hong Chul Moon, Jin Kon Kim, Victor Pryamitsyn, Venkat Ganesan

Research output: Contribution to journalArticle

20 Scopus citations

Abstract

The phase behavior of (A-B)/(A-C) binary blends capable of hydrogen bonding between B and C blocks was investigated, focusing on the degree of hydrogen bonding power. Two kinds of binary blends (PS-b-P4VP/PS-b-PHS and PS-b-P2VP/PS-b-PHS) were employed. It was observed by small-angle X-ray scattering (SAXS) and TEM that the PS-b-P4VP/PS-b-PHS blend formed asymmetric lamellar morphology at more asymmetric volume fraction where PS-b-P2VP/PS-b-PHS blend could not form. By comparing the experimentally observed morphology with theoretically predicted morphology by the SST model, we estimated of P4VP/PHS to be -0.17 and Flory-Huggins segmental interaction parameter of P2VP/PHS to have a value between -0.05 and -0.075. Flory-Huggins segmental interaction parameter P4VP/PHS was greater than that of P2VP/PHS. From the strong stretching Theory (SST) model, extremely large asymmetric lamellar morphology could be achieved when very large favorable intermolecular force between B and C blocks is introduced.

Original languageEnglish (US)
Pages (from-to)6347-6352
Number of pages6
JournalMacromolecules
Volume48
Issue number17
DOIs
StatePublished - Jan 1 2015

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