Investigations on Preparation and Characterization of Certain Copolyesters

Abstract

In this paper, we report on the synthesis and characterization of high molecular weight copolyesters from Terephthalic acid, 1, 4 butane diol and Succinic acid /Sebacic acid through a two step process of melt polycondensation using titanium tetra butoxide as catalyst. The synthesized aromatic-aliphatic random copolyesters were characterized by means of FTIR, 1 H NMR, 13C NMR, Differential Scanning Calorimetry (DSC), X-ray Diffraction (XRD), Gel Permeation Chromatography (GPC) and Scanning Electron Microscope (SEM) studies. The effect of copolymer composition on the physical and thermal properties as well as degradation test was investigated. The degradation test was carried out in alkali medium. The phase behaviour of the polymers was studied by differential scanning calorimetry and optical polarising microscopy. The results revealed that the newly synthesized copolyesters exhibited degradability and thermotropic liquid crystalline behaviour with nematic texture which was revealed by optical polarising microscopy. The Novelty of this work is that the glass transition temperature and melting temperature are above the room temperature for the synthesized polymers. This shows the good thermal stability which results in early processing of liquid crystalline materials.

A study on antibacterial and anti‐inflammatory activity of xylitol‐based polymeric nano‐bioactive glass nanocomposites

“…The chromatogram appeared in Figure 4. GPC is performed to decide the number of normal atomic weight, weight normal atomic weight and polydispersity list for orchestrated PXMA are 437, 725, and 1.6 12 . The PXMA prepolymer was dissolved into the specified shape and cured by polycondensation at 80°C for 14 days to control the dissolve polymerization handle applied on the atomic weight.…”

"Synthesis, Characterization and Comparison of Biodegradable Aliphatic Copolyesters: Poly Ethylene Glycol Octanediol Sebacate and Polyethylene Glycol Dodecanediol Adipate"

“…These polyesters possess thermal stability due to their glass transition and melting temperatures as previously reported 2 . Reports reveal that these biodegradable polymers are easily decomposed with the assistance of microorganisms 3,4 . Nowadays, biodegradation rate of acyclic copolymers was administered by increasing the quantity of ester groups within the main chain and additionally by determining its relative molecular mass 5,6 .…”