Phase transformation and self-assembly behavior of supramolecular rod-comb block copolymers

Yi Huan Lee, Chun Jie Chang, Yi Lung Yang, Chi Ju Chiang, Yu Ping Lee, Ching Shen, Kang Ting Tsai, Yi Fan Chen, Chi An Dai

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

We investigated the self-assembly behavior of a series of supramolecular rod-comb block copolymer complexes made by the hybridization of rod-coil diblock copolymers of poly (2,5-di(2-ethylhexyloxy)-1,4-phenylene vinylene)-b-poly(2- vinyl pyridine) (PPV-b-P2VPf) with different volume fractions, f, of the P2VP coils and an anionic surfactant, dodecyl benzenesulfonic acid (DBSA), that selectively interacts with the P2VP to form the side-chain comb teeth. The resulting hybrids show hierarchically ordered structures at multiple length scales, forming so-called structure-in-structure morphology. Notably, for PPV-b-P2VP0.56(DBSA)x, the larger-scale structure changes from a lamellar phase, to a broken lamella, and eventually to a hexagonally packed strip phase with increasing DBSA molar ratio (x) to P2VP monomer unit. Furthermore, simultaneous SAXS and WAXS measurements showed that the order-disorder transition temperatures of larger-scale structures in the PPV-P2VP0.56(DBSA) rod-comb systems were higher than those associated with the pristine PPV-P2VP0.56 polymers. The large-scale structure of PPV-P2VP0.56(DBSA) exists at temperatures around 210 °C even though the rod-rod interaction between PPV blocks disappear at ∼120°C, signifying that the formation of the P2VP(DBSA) lamellar mesophase plays a critical role in forming the large-scale hexagonally packed strip structures.

Original languageEnglish
Pages (from-to)2481-2490
Number of pages10
JournalPolymer
Volume55
Issue number10
DOIs
StatePublished - 13 May 2014

Keywords

  • Hierarchical structure
  • Macroterminator
  • Rod-comb block copolymer

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