Synthesis and characterization of oligo(lactone) methacrylates

✍ Scribed by Barbara Sandner; Simone Steurich; Udo Gopp

• Book ID: 104164542
• Publisher: Elsevier Science
• Year: 1997
• Tongue: English
• Weight: 590 KB
• Volume: 38
• Category: Article
• ISSN: 0032-3861
• DOI: 10.1016/s0032-3861(96)00809-9

✦ Synopsis

Oligo(lactone) methacrylates have been synthesized by oligomerization of L-lactide, D,L-lactide, e-caprolactone and glycolide as well as by cooligomerization of the latter two with the former two. The oligomerization reaction was initiated by bisphenol-A-bis(2-hydroxypropyl methacrylate) and catalysed by a series of coordination-insertion catalysts of ring-opening polymerizations of lactones. The kinetics of the oligomerization of lactide at 130°C and the relatively narrow molecular weight distribution of the macromonomers, characterized by Mw/M n ~ 1.2, suggest a living mechanism of the reaction. Optically pure macromonomers were obtained from L-lactide using Sn(II) octoate as a catalyst. Other catalysts, e.g. MgO, CaO, SnO2 etc.,. Relationships between the nature of the lactone units as well as the oligomerization degree of the macromonomers and the glass transition temperatures, melting points and degrees of crystallinity of the macromonomers were determined.