Soluble Telechelic Polycondensation Poly(ether ketones): Synthesis and Characterization. Issue 19 (3rd September 2019)

• Record Type: Journal Article
• Authors: Benhalima, Abdelkader; Furtos, Alexandra; Brisson, Josée
• Is Part Of: Macromolecular chemistry and physics. Volume 220:Issue 19(2019)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2019-09-03
• Subjects: chain‐growth polycondensation -- matrix‐assisted laser desorption/ionization time of flight spectrometry -- poly(ether ketone) -- prepolymers -- telechelic molecules; Polymers -- Periodicals; Polymerization -- Periodicals; Synthetic products -- Periodicals; Macromolecules -- Periodicals; 547.7
• DOI: 10.1002/macp.201900234
• Languages: English
• ISSNs: 1022-1352

Abstract

Abstract: The present article reports the synthesis of soluble, propyl‐substituted aromatic ring telechelic polycondensation blocks having molecular weights ranging from 1800 to 6500 g mol −1 and polymolecularities of 1.3 to 1.7. Chain‐growth polycondensation is performed, and the initiator is selected through reactivity studies, using 19 F nuclear magnetic resonance (NMR) measurements. Gel permeation chromatography, NMR spectroscopy, and matrix‐assisted laser desorption/ionization time of flight mass spectrometry show that blocks are terminated by a methoxy group at one end and a fluorine atom at the other. Polymers are crystalline as synthesized, as shown by X‐ray diffraction and differential scanning calorimetry, do not recrystallize once melted, and undergo solvent‐induced crystallization. Crystalline peak positions and relative intensities are different from those observed for other poly(ether ketones). The difference in crystal form is proposed to stem from packing disruption related to the presence of propyl substituents. Thermogravimetry shows a good thermal resistance up to 450 °C. Abstract : Telechelic polycondensation poly(ether ketones) with propyl substitution have a lot to offer: solubility in chlorocarbons, semicrystallinity, thermal stability to 450 °C, and two different end‐groups (F and OMe), allowing for a different reactivity on each side. Matrix‐assisted laser desorption/ionization time of flight mass spectrometry shows that secondary reactions lead mainly to macrorings.