Journal
JOURNAL OF MACROMOLECULAR SCIENCE PART A-PURE AND APPLIED CHEMISTRY
Volume 52, Issue 6, Pages 454-464Publisher
TAYLOR & FRANCIS INC
DOI: 10.1080/10601325.2015.1029371
Keywords
melt polycondensation; Copolymerization; random microstructure; bis(2-hydroxy ethyl terephthalate); epsilon-caprolactone
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Funding
- Ministry of Higher Education, Scientific Research and Technology in Tunisia
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Copolyesters containing aliphatic units in the main chain were obtained by reacting Bis(2-hydroxy ethyl terephthalate) (BHET) with epsilon-caprolactone (epsilon-CL) at a high temperature in bulk in the presence of tin octoate as catalyst. Various copolyesters were synthesized by using BHET/epsilon-CL mass ratio ranging from 90/10 to 10/90. Thermal properties were studied by DSC and TGA, and structural characterization was carried out by H-1-NMR spectroscopy. These techniques confirm the insertion of lactones units in PET chains. The degree of randomness of 30/70 to 60/40 copolyesters, determined by H-1-NMR, shows a random microstructure. The other copolyesters exhibit some block copolymer character.
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