Synthesis and structure of biodegradable hexylene terephthalate-co-lactide copolyesters |
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Authors: | Y Chen L Tan W Zhou J Su Y Yang Y Hu |
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Institution: | (1) Institute of Polymers, Department of Chemistry, Nanchang University, Nanchang, 330031, People’s Republic of China;(2) College of Mechanical and Electronic Engineering, Jingdezhen Ceramic Institute, Jingdezhen, 333001, China |
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Abstract: | To obtain a biodegradable polymer material with satisfactory thermal properties, higher elongation and modulus of elasticity,
a new copolyester, poly(hexylene terephthalate-co-lactide) (PHTL), was synthesized via direct polycondensation from terephthaloyl
dichloride, 1,6-hexanediol and oligo(lactic acid). The resulting copolyesters were characterized by proton nuclear magnetic
resonance (1H NMR), differential scanning calorimetry (DSC), thermogravimetry (TG) and wide-angle X-ray scattering (WAXS). By using the
relative integral areas of the dyad peaks in 1H NMR spectrum of copolyesters PHTL, the sequence lengths of the hexylene terephthalate and lactide units in the resultant
copolyesters are 3.5 and 1.5, respectively. Compared to poly(hexylene terephthalate) (PHT), PHTL has lower T
m but higher T
g due to the incorporation of lactide unit into the main chains of copolyesters. The degradation test of copolyesters under
a physiological condition shows that the degradability of PHTL is sped up due to incorporation of lactide segments. |
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Keywords: | biodegradation copolyesters lactide poly(hexylene terephthalate) |
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