Polylactide Photoresins for Stereolithography: Stereochemical and Molar-Mass Identity, Urethane-Methacrylate and Triacrylate Routes, Laser-Modality Dependence, Upcycling and Qualification

Direct primary studies demonstrate photocurable PLA derivatives produced through a two-stage urethane/methacrylate route in supercritical carbon dioxide, a one-pot liquid poly(L-lactide)-PETA triacrylate, and a transesterification/methacrylation upcycling route for stereolithography. The first platform reported cured-structure Young’s modulus from 16.9 to 102.5 MPa depending on lamp, LED, two-photon or laser-stereolithography conditions, showing that cure modality is part of material state. The one-pot PLA-PETA platform reported 91% crosslinkage and greater than 90% mean cell viability under its assay. The upcycling platform spanned 33–3911 mPa·s at 30 °C, reached 51 wt% PLA-waste content and reported a best-system storage modulus of 2240 MPa. These values are not transferable between derivatives. Qualification must close feedstock history, stereochemistry, molar-mass distribution, achieved functionality, crosslinker/initiator, conversion, extractables, thermal state, degradation and realised geometry.

3Dresyns Engineering Review ER-118, version 0.2. Provider-neutral technical review. The deposited PDF is controlled by its exact SHA-256 in the release manifest.