Branched biodegradable poly(ester-urethane) (PEU) was blended with two elastic biodegradable copolymers in proportions 5, 10, 15, and 20 wt % to investigate their effect on this hard and brittle polymer. Copolymer of L-lactide and 1-caprolactone, P(L-LA50/CL50), was synthesized by ring-opening polym
The biodegradation of lactic acid-based poly(ester-urethanes)
✍ Scribed by Kari Hiltunen; Jukka V. SeppÄlÄ; Merja ItÄvaara; Mika HÄrkönen
- Book ID
- 110672134
- Publisher
- Springer US
- Year
- 1997
- Tongue
- English
- Weight
- 496 KB
- Volume
- 5
- Category
- Article
- ISSN
- 1572-8900
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The hydrolysis behaviour of lactic acid based poly(ester-urethane)s has been studied in a bu †er solution of pH 7É00 at 37 and 55¡C. Samples were prepared using a straight two step lactic acid polymerization process. The lactic acid was Ðrst polymerized by condensation with a low molecular weight by
Copolymers of L-lactic acid (LLA) with DL-mandelic acid (DLMA), 4-hydroxybenzoic acid, 4-acetoxybenzoic acid, DL-malic acid, or anhydrous citric acid were synthesized via direct copolycondensation in the presence of 1,4-butanediol, using stannous octoate as catalyst. The effect of the comonomer and
We studied a two step process for lactic acid polymerization: in the first step, the lactic acid is condensation polymerized to a low molecular weight hydroxyl terminated prepolymer and then the molecular weight is raised by joining prepolymer chains together using diisocyanate as the chain extender