Thermodynamic parameters of poly(lactic acid) solutions in dialkyl phthalate

Some of thermodynamic parameters for poly(lactic acid) (PLA)/dialkyl phthalate systems have been investigated. Both poly(DL-lactic acid) (PDLLA) and poly(L-lactic acid) (PLLA), which are stereoisomers of PLA, were used and a series of 1,2-dialkyl phthalates with different alkyl chain, from methyl to hexyl, was adopted as a solvent. Theta temperatures of PLA/dialkyl phthalate system were determined and subsequently the second virial coefficient and the interaction parameter were evaluated. Theta temperature was determined by the extrapolation of the highest liquid-liquid phase separation temperatures and Zimm plots were constructed by static light scattering to obtain second virial coefficient and z-average radius of gyration. Second virial coefficient and z-average radius of gyration was examined quantitatively as a function of temperature and solvent. Thermodynamic parameters that could not be obtained experimentally were calculated based on the Flory-Huggins theory. (C) 2004 Elsevier Ltd. All rights reserved.
Publisher
Elsevier Sci Ltd
Issue Date
2004-06
Language
ENG
Keywords

UNPERTURBED DIMENSIONS; PHASE-SEPARATION; POLYLACTIC ACID; POLYPROPYLENE; TEMPERATURES; CONFORMATION; STATISTICS; SYSTEMS; CHAINS

Citation

POLYMER, v.45, no.13, pp.4491 - 4498

ISSN
0032-3861
DOI
10.1016/j.polymer.2004.04.036
URI
http://hdl.handle.net/10203/3004
Appears in Collection
CBE-Journal Papers(저널논문)
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