Oligomerisation of L-Lactic acid to Prepolymer

MahoneyTree
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I need help undersating what happens in the chemical process.
I am working on my Thesis in which i synthesised PLA out of L-lactic acid. I am using the Methods from a research paper from the HEIA-FR which i linked here aswell.

https://www.chimia.ch/chimia/article/view/2012_951/4616

The second step is to perform a polymerisation of pure lactic acid to a prepolymer of PLA. I have done this and know what the educt aswell as product formulas are, but I don't know what happens in terms of a chemical process during the polymerisation.

Simply put, I need someone to explain to me what happens to the lactic acid molecule durng the polymerisation so that it turns into the prepolymer.

Thank you very much for your help
 
Chemistry news on Phys.org
It's an auto-esterification where the acid and alcohol functional group of lactic acid bind, releasing water.

Is this what you were looking for?
 

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