Lactic acid based poly(ester-urethanes):
Lactic acid based poly(ester-urethanes): Use of hydroxyl terminated prepolymer in urethane synthesis
β
Kari Hiltunen; Jukka V. SeppΓ€lΓ€; Mika HΓ€rkΓΆnen
π
Article
π
1997
π
John Wiley and Sons
π
English
β 223 KB
π 2 views
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