Synthesis And Characterization Of New Long Chain Aliphatic Polyesters Derived From Dicarboxylic Acid With Diols Using p-Toluene Sulfonic Acid As Catalyst

Abstract

The recent research in the polymers area concern with the synthesis of aliphatic biodegradable polyester- based polymers with long chain which can be degraded usefully. The aliphatic based polyester was receiving special attention due to sensitivity to degradation. A new series of long-chain linear co-polyesters with up to 20 carbon atoms were designed and synthesized in this study by condensation polymerization catalyzed by p-toluene sulfonic acid using toluene as solvent.

 Copolyesters containing various structure aliphatic diols were prepared as decan-1,10-dioic acid-co–cis-buten-2,4-dioate (P1), dodecane-1,10-dioic acid -co-1,10- decanedioate (P2), 1,4- cyclohexane-co-1,4-butandicarboxylate (P3) and 1,4-cyclohexan-co-1,10-decancarboxylate (P4).

The linear copolyesters were characterized by variety of techniques such as FTIR, ¹H- and ¹³C-NMR spectroscopy. The average molecular weight (Mw), number average molecular weight (Mn) and poly dispersity index for these poly esters were measured by gel permeation chromatography techniques, The influence of the different polyesters middle block on microstructure, the structures and crystallization properties of the copolymers was investigated. P1 copolymer showed the highest weight average molecular weight (Mw) of 17771 g/mole and copolymer P2 showed number average molecular weight (Mn)  5484 g/mole , while poly disparity index(PDI) was 3.78 for copolymer P1 .