Why adding Propylene Glycol to PEGDA for 3D printing changes the optical properties of the polymer?

30 May 2021 1 749 Report

Hi, I am working with PEGDA (polyethylene glycol diacrylate) for SLA 3D printing. Parts made from 100% PEGDA are transparent after production, while adding increasing amounts of propylene glycol to the pegda solution makes the final part appearing milky-white. Why does that happen? What causes this phenomenon? Please note that the liquid mixture of PEGDA/propylene glycol is also transparent before 3D printing.

Francisco Lopez-Serrano

Dear Carlo: I beleive you have a phase separation problem. The refractive indexes of PEG and PEGDA are 1.4339 and 1.463, respectively. After the 3D printing process, small segregates of PEG are formed. These have to be larger than 300 nm, in order to cause light dispersion, that is milky appeareance.

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