Synthesis of polylactic acid-diol (PLA-diol) from lactic acid and 1,4-butanediol

Abstract

In this research, the PLA-diol were synthesized from lactic acid (LA) and  1.4 butanediols (BD) with a tin octoate Sn(Oct)₂ catalyst at  a temperature of 180 °C and the pressure 5 mmHg. The structure and properties of PLA-diol are analyzed by the following methods: GPC, 1H-NMR and DSC. As a result, with the change in the content of Sn (Oct)₂ from 0.1 to 1.0%, the molecular weight  Mn of PLA - diol increased gradually from 4.119,2 to 7.359,6 g / mol . In addition, the BD content increased from 2.0% to 5.0%, the average molecular weight of the product decreased gradually from 7.536,9 g / mol to 4.735 g / mol, respectively. This change will affect the ability to use PLA-diol in the next denaturation research to apply in the field of biodegradable polymer such as copolymer with polyurethane, copolymer with polyethylene glycol diacid, or chain extension with other polymer in a chain reaction,...