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Thermomechanical film properties and aging of blends of poly(lactic acid) and malonate oligomers

Ljungberg, Nadia LU and Wesslén, Bengt LU (2004) In Journal of Applied Polymer Science 94(5). p.2140-2149
Abstract
Malonate oligomers were synthesized as plasticizers for poly(lactic acid) (PLA). Esterification reactions were performed between diethyl bishydroxymethyl malonate (DBM) and either adipoyl dichloride or succinyl dichloride. Two molar masses were obtained within each series. Blending was carried out with PLA and the four oligomers as well as the monomeric unit from the syntheses (DBM). Dynamic mechanical analysis and differential scanning calorimetry were used to investigate the viscoelastic mechanical and thermal film properties of the blends. All the investigated plasticizers reduced the glass-transition temperature of PLA, and the plasticization effect was better for the plasticizers of low molar mass. However, the amorphous domains of... (More)
Malonate oligomers were synthesized as plasticizers for poly(lactic acid) (PLA). Esterification reactions were performed between diethyl bishydroxymethyl malonate (DBM) and either adipoyl dichloride or succinyl dichloride. Two molar masses were obtained within each series. Blending was carried out with PLA and the four oligomers as well as the monomeric unit from the syntheses (DBM). Dynamic mechanical analysis and differential scanning calorimetry were used to investigate the viscoelastic mechanical and thermal film properties of the blends. All the investigated plasticizers reduced the glass-transition temperature of PLA, and the plasticization effect was better for the plasticizers of low molar mass. However, the amorphous domains of PLA became saturated with plasticizer at a certain concentration, and phase separation occurred. A higher molar mass of the plasticizer caused this saturation to occur at lower plasticizer concentrations. Subsequently, the aging of the blends at the ambient temperature for 4 months induced phase separation in the blends containing DBM, whereas those with an oligomeric plasticizer were stable and remained compatible with PLA within the aging period. (C) 2004 Wiley Periodicals. (Less)
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author
organization
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type
Contribution to journal
publication status
published
subject
in
Journal of Applied Polymer Science
volume
94
issue
5
pages
2140 - 2149
publisher
John Wiley & Sons
external identifiers
  • wos:000224759700037
  • scopus:9144230792
ISSN
1097-4628
DOI
10.1002/app.21100
language
English
LU publication?
yes
id
c9d04135-d208-48bd-bb95-984a27925db2 (old id 139486)
date added to LUP
2007-07-13 14:12:20
date last changed
2017-05-21 03:31:16
@article{c9d04135-d208-48bd-bb95-984a27925db2,
  abstract     = {Malonate oligomers were synthesized as plasticizers for poly(lactic acid) (PLA). Esterification reactions were performed between diethyl bishydroxymethyl malonate (DBM) and either adipoyl dichloride or succinyl dichloride. Two molar masses were obtained within each series. Blending was carried out with PLA and the four oligomers as well as the monomeric unit from the syntheses (DBM). Dynamic mechanical analysis and differential scanning calorimetry were used to investigate the viscoelastic mechanical and thermal film properties of the blends. All the investigated plasticizers reduced the glass-transition temperature of PLA, and the plasticization effect was better for the plasticizers of low molar mass. However, the amorphous domains of PLA became saturated with plasticizer at a certain concentration, and phase separation occurred. A higher molar mass of the plasticizer caused this saturation to occur at lower plasticizer concentrations. Subsequently, the aging of the blends at the ambient temperature for 4 months induced phase separation in the blends containing DBM, whereas those with an oligomeric plasticizer were stable and remained compatible with PLA within the aging period. (C) 2004 Wiley Periodicals.},
  author       = {Ljungberg, Nadia and Wesslén, Bengt},
  issn         = {1097-4628},
  language     = {eng},
  number       = {5},
  pages        = {2140--2149},
  publisher    = {John Wiley & Sons},
  series       = {Journal of Applied Polymer Science},
  title        = {Thermomechanical film properties and aging of blends of poly(lactic acid) and malonate oligomers},
  url          = {http://dx.doi.org/10.1002/app.21100},
  volume       = {94},
  year         = {2004},
}