engleski

Effect of 3D printing settings and post-processing conditions on polyacrylate materials used in stereolithography

Production of 3D components with a wide range of customization options is made simple and affordable by additive manufacturing. Stereolithography (SLA), which enables the production of micro- and milliscale reactionware (Figure 1) utilizing transparent materials, is one particularly intriguing technological advancement. This study examines the effects of 3D printing parameters, including printing angle, layer thickness, post-processing conditions, test sample size, and form, on mechanical, thermal, and physico-chemical properties. Clear and High Temperature are two photocurable acrylate resins that were utilized for 3D printing. Several techniques and various treatment durations were used to post-cure the test samples. According to the results of the tensile test, a higher degree of cure yields a higher tensile strength and less elongation. Compared to some post-curing techniques, layer thickness and print angle have a greater impact on tensile strength. The toughest samples were discovered to be those printed at a 45° angle with a 25 μm layer thickness. Clear samples are reported to be able to take greater stress and strain than High Temperature samples, however High Temperature samples are more stiff and have a higher Young’s modulus. Differential scanning calorimetry (DSC) measurements reveal that post-curing lowers the curing enthalpy while raising the glass transition temperature, a sign that the polymer chains have been crosslinked. With an absorption of less than 2% over the course of 24 hours, the swelling test revealed that both resins can be regarded as water resistant. High Temperature resin was found to be more resistant to ethanol and acetone than Clear resin. The samples that had been post-cured in the SunTest chamber also displayed significantly less ethanol and acetone absorption. No matter how much post-curing has occurred or how the printing angle has been set, the contact angle test reveals that all samples are hydrophilic.

3D printing parameters, milliscale reactionware, post-curing

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