Liquid crystalline hyperbranched polyesters with phosphorus functional groups. (May 2021)

• Record Type: Journal Article
• Authors: Serbezeanu, Diana; Macsim, Ana-Maria; Carja, Ionela-Daniela; Hamciuc, Corneliu; Pislaru, Marius; Vlad-Bubulac, Tăchiţă
• Is Part Of: High performance polymers. Volume 33:Number 4(2021)
• Page Start: 383
• Page End: 393
• Publication Date: 2021-05
• Subjects: Hyperbranched polymers -- phosphorus-containing polymers -- dendritic polymer -- liquid crystalline properties; Polymerization -- Periodicals; Polymers -- Periodicals; 547.7
• DOI: 10.1177/0954008320960532
• Languages: English
• ISSNs: 0954-0083

Abstract

Liquid crystalline hyperbranched poly(aryl ester)s (A2 B3 ) were prepared by polycondensation reaction of 2-(6-oxido-6H-dibenz<c, e><1, 2>oxaphosphorin-6-yl)1, 4-naphthalene diol with 1, 3, 5-benzenetricarbonyl trichloride, taken in two different molar ratios. The chemical structure of the newly synthesized hyperbranched polymers was confirmed by FTIR, 1 H NMR, 13 C NMR spectroscopy. The polymers exhibited high thermal stability with initial decomposition temperature above 410–435°C and char yield at 700°C higher than 40%. Combined differential scanning calorimetry, polarized optical microscopy and wide-angle X-ray diffraction measurements were carried out to closely examine their thermal behavior and phase transitions.