Continuous cyclo-polymerisation of l -lactide by reactive extrusion using atoxic metal-based catalysts: easy access to well-defined polylactide macrocycles

Macrocyclic polylactide was synthesized by reactive extrusion polymerisation of l -lactide using lanthanide trisborohydrides as the catalysts. This is the first example of a cyclic polyester obtained directly via a continuous process.