NDLI: Thermal stability of copolymer derived from l-lactic acid and poly(tetramethylene) glycol through direct polycondensation

Content Provider	Springer Nature Link
Author	Zeng, Chao Zhang, Nai Wen Feng, Shu Qin Ren, Jie
Copyright Year	2012
Abstract	The thermogravimetric analysis (TG) of triblock copolymers (PLAG) based on poly(l-lactic acid) (PLLA) and poly(tetramethylene) glycol (PTMEG) segments with different PTMEG content and catalyst concentration was conducted. The thermal degradation behaviors of copolymers were determined by thermogravimetric analysis and the results are also confirmed by hydrogen nuclear magnetic resonance spectrometry ($^{1}$H NMR). The thermal stability of PLA-based copolymer is improved with decreasing use level of Sn catalyst and short-chain molecules with hydroxyl and carboxyl end group also have a significant effect on the thermal degradation of chain-extended products of copolymer (PLAE). PLAE-10 with 0.5 wt% catalyst shows two main decomposition kinetic mechanisms. On the other hand, PLAE-10 with 0.05 wt% catalyst mainly undergoes Sn-catalyzed selective depolymerisation. Moreover, the PTMEG segments in PLAEs seem to increase the mobility of the Sn salt moiety in PLAEs and the activation energy (E $_{a}$) decreases with increasing the PTMEG content in PLAEs.
Starting Page	633
Ending Page	646
Page Count	14
File Format	PDF
ISSN	13886150
Journal	Journal of thermal analysis
Volume Number	111
Issue Number	1
e-ISSN	15728943
Language	English
Publisher	Springer Netherlands
Publisher Date	2012-07-03
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Thermal stability Poly(lactic acid) Direct polycondensation Triblock copolymers Thermogravimetry Activation energy Physical Chemistry Analytical Chemistry Polymer Sciences Inorganic Chemistry Measurement Science and Instrumentation
Content Type	Text
Resource Type	Article
Subject	Physical and Theoretical Chemistry Condensed Matter Physics

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