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Synthesis, characterization and properties of a soluble polymer with a poly(phenylenevinylene) structure
Author(s) -
Babudri Francesco,
Cicco Stefania R.,
Farinola Gianluca M.,
Naso Francesco,
Bolognesi Alberto,
Porzio William
Publication year - 1996
Publication title -
macromolecular rapid communications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.348
H-Index - 154
eISSN - 1521-3927
pISSN - 1022-1336
DOI - 10.1002/marc.1996.030171209
Subject(s) - differential scanning calorimetry , polymer , mesophase , materials science , polystyrene , crystallinity , polymer chemistry , gel permeation chromatography , condensation polymer , liquid crystal , physics , optoelectronics , composite material , thermodynamics
Soluble poly(2,5‐dialkoxy‐1,4‐phenylenevinylene) has been prepared via Stille coupling reaction between 2,5‐dialkoxy‐1,4‐diiodobenzene and E ‐1,2‐bis(tributylstannyl)‐ethene in the presence of palladium complexes. Characterization of this material by means of 1 H and 13 C nuclear magnetic resonance (NMR), ultraviolet/visible (UV/VIS) and infrared (IR) spectra is described. Molecular weights, determined by means of gelpermeation chromatography (GPC) analysis and referred to standard polystyrene, were in the range number‐average molecular weights M n = 2061–2544 and weight‐average molecular weights M w = 3347–3878. X‐ray diffraction (XRD) analysis of the polymer showed semicrystalline structure. T g = 57°C, transition to a stable smectic mesophase at 115°C and clearing point at 210°C were revealed by differential scanning calorimetry analysis, optical microscopy observation and XRD of the annealed polymer.