A method for manufacturing poly(2-hydroxyalkanoic acid), preferably a poly(lactic acid), is disclosed, The method comprises the steps of: mixing a cyclic diester of a 2-hydroxyalkanoic acid and a polymerization catalyst, polymerizing the cyclic diester to form poly(2-hydroxyalkanoic acid) in liquid phase, adding a peroxide-based compound as a catalyst deactivating agent to the liquid phase, applying a devolatilisation step to the liquid phase, and allowing the poly(2-hydroxyalkanoic acid) to solidify, characterized in that an end-capping agent is added to the poly(2-hydroxyalkanoic acid) in the liquid phase. The present invention also relates to a poly(2-hydroxyalkanoic acid), preferably a poly(lactic acid), obtainable with said method characterized in that the polymer has a Mn abs ranging between 10000 and 250000 g/mol, preferably between 20000 and 85000 g/mol. [FIG. 1]
本发明公开了一种制造聚(2-羟基烷酸),最好是聚(
乳酸)的方法,该方法包括以下步骤:将 2-羟基烷酸的环状二酯和聚合催化剂混合,聚合环状二酯形成液相中的聚 2-羟基烷酸,在液相中加入过氧化物基化合物作为催化剂失活剂,在液相中进行脱胶步骤,使聚 2-羟基烷酸凝固,其特征在于在液相中的聚 2-羟基烷酸中加入端盖剂。本发明还涉及一种聚(2-羟基烷酸),最好是一种聚(
乳酸),可通过上述方法获得,其特征在于聚合物的 Mn abs 在 10000 至 250000 g/mol 之间,最好在 20000 至 85000 g/mol 之间。[图 1]