Hydrogen-bonded liquid crystalline polymers containing poly(4-vinylpridine) and dendron-like side chains: Fromlamellar to columnar phase. (September 2015)

• Record Type: Journal Article
• Authors: Wang, Jingkui; Ma, Shenhao; Chen, Xiaofang; Chen, Hong
• Is Part Of: Materials today communications. Volume 4(2015)
• Page Start: 77
• Page End: 85
• Publication Date: 2015-09
• Subjects: Hydrogen bond -- Supramolecular polymer -- Liquid crystalline polymer; Materials science -- Periodicals; 620.11
• DOI: 10.1016/j.mtcomm.2015.06.002
• Languages: English
• ISSNs: 2352-4928

Abstract

Graphical abstract: Abstract: We investigated the phase behavior of a series of supramolecular polymer complexes P4VP( n CTB) x in which poly(4-vinylpyridine) (P4VP) is hydrogen-bonded with dendron-like small moleculescontaininga phenolic end group ( n CTB, n = 6, 10, 12, 14). Supramolecular lamellar and hexagonal columnar (ΦH ) structures were investigated via small angle X-ray scattering (SAXS), polarized optical microscopy (POM) and differential scanning calorimetry (DSC). The stability of the lamellar and ΦH phases is dependent on the blending ratio of n CTB per vinylpyridine unit ( x ), alkyl tail length ( n ) and thermal treatment. The P4VP(6CTB) x exhibit only a poorly ordered lamellar phase. Upon increasing x, the phase structure of the polymer complexes ( n = 10, 12, 14) can transform from the lamellar to the ΦH phase. As a result of the thermal dynamic nature of hydrogen bond and the conformation changing of P4VPduring the thermal annealing, a non-reversible order-to-order transition from lamellar to ΦH phase appears when the volume fraction of the alkyl tails is 0.56–0.58.