The biodegradation of lactic acid-based poly(ester-urethanes)

Kari Hiltunen, Jukka Seppälä, Merja Itävaara, Mika Härkönen

Research output: Contribution to journalArticleScientificpeer-review

25 Citations (Scopus)

Abstract

The biodegradability of lactic acid based poly(ester-urethanes) was studied using the headspace test method, which was performed at several elevated temperatures. The poly(ester-urethanes) were prepared using a straight two-step lactic acid polymerization process. The lactic acid is first condensation polymerized to a low molecular weight hydroxyl-terminated telechelic prepolymer and then the molecular weight is increased with a chain extender such as diisocyanate. In the biodegradation studies the effect of different stereostructures (different amounts of D-units in the polymer chain), the length of ester units, and the effect of crosslinking on the biodegradation rate were studied. The results indicate that poly(ester-urethanes) do not biodegrade at 25‡C, but at elevated temperatures they biodegrade well. The different stereostructures and crosslinking have a strong influence on the biodegradation rate. The length of ester units in the polymer chain also affects the biodegradation rate, but much less than crosslinking and stereostructure.

Original languageEnglish
Pages (from-to)167 - 173
Number of pages7
JournalJournal of Environmental Polymer Degradation
Volume5
Issue number3
DOIs
Publication statusPublished - 1997
MoE publication typeA1 Journal article-refereed

Fingerprint

Lactic acid
Biodegradation
Lactic Acid
Esters
Crosslinking
Polymers
Molecular weight
Biodegradability
Hydroxyl Radical
Condensation
Polymerization
Temperature
microthane foam

Keywords

  • biodegradation

Cite this

Hiltunen, Kari ; Seppälä, Jukka ; Itävaara, Merja ; Härkönen, Mika. / The biodegradation of lactic acid-based poly(ester-urethanes). In: Journal of Environmental Polymer Degradation. 1997 ; Vol. 5, No. 3. pp. 167 - 173.
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The biodegradation of lactic acid-based poly(ester-urethanes). / Hiltunen, Kari; Seppälä, Jukka; Itävaara, Merja; Härkönen, Mika.

In: Journal of Environmental Polymer Degradation, Vol. 5, No. 3, 1997, p. 167 - 173.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - The biodegradation of lactic acid-based poly(ester-urethanes)

AU - Hiltunen, Kari

AU - Seppälä, Jukka

AU - Itävaara, Merja

AU - Härkönen, Mika

PY - 1997

Y1 - 1997

N2 - The biodegradability of lactic acid based poly(ester-urethanes) was studied using the headspace test method, which was performed at several elevated temperatures. The poly(ester-urethanes) were prepared using a straight two-step lactic acid polymerization process. The lactic acid is first condensation polymerized to a low molecular weight hydroxyl-terminated telechelic prepolymer and then the molecular weight is increased with a chain extender such as diisocyanate. In the biodegradation studies the effect of different stereostructures (different amounts of D-units in the polymer chain), the length of ester units, and the effect of crosslinking on the biodegradation rate were studied. The results indicate that poly(ester-urethanes) do not biodegrade at 25‡C, but at elevated temperatures they biodegrade well. The different stereostructures and crosslinking have a strong influence on the biodegradation rate. The length of ester units in the polymer chain also affects the biodegradation rate, but much less than crosslinking and stereostructure.

AB - The biodegradability of lactic acid based poly(ester-urethanes) was studied using the headspace test method, which was performed at several elevated temperatures. The poly(ester-urethanes) were prepared using a straight two-step lactic acid polymerization process. The lactic acid is first condensation polymerized to a low molecular weight hydroxyl-terminated telechelic prepolymer and then the molecular weight is increased with a chain extender such as diisocyanate. In the biodegradation studies the effect of different stereostructures (different amounts of D-units in the polymer chain), the length of ester units, and the effect of crosslinking on the biodegradation rate were studied. The results indicate that poly(ester-urethanes) do not biodegrade at 25‡C, but at elevated temperatures they biodegrade well. The different stereostructures and crosslinking have a strong influence on the biodegradation rate. The length of ester units in the polymer chain also affects the biodegradation rate, but much less than crosslinking and stereostructure.

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