Effects of polymer-grafted natural nanocrystals on the structure and mechanical properties of poly(lactic acid): A case of cellulose whisker-graft-polycaprolactone

Lactic acid based poly(ester-urethane)s:

Lactic acid based poly(ester-urethane)s: The effects of different polymerization conditions on the polymer structure and properties

✍ Kari Hiltunen; Jukka V. Seppälä; Mika Härkönen 📂 Article 📅 1997 🏛 John Wiley and Sons 🌐 English ⚖ 198 KB 👁 1 views

A two-step process for lactic acid polymerization is studied: in the first step the lactic acid is condensation-polymerized to a low-molecular-weight hydroxylterminated prepolymer; and then the molecular weight is raised by joining prepolymer chains together using diisocyanate as the chain extender.