The authors thank the Deutsche Forschungsgemeinschaft (DFG) for financial support within Sonderforschungsbereich SFB 428, Sartomer, Inc. for providing multifunctional acrylates CN 922 and SR368, Rahn AG for providing multifunctional acrylate Genomer 4302 and Ciba Specialty Chemicals, Inc. for providing Irgacure 784. Supporting Information is available online from Wiley InterScience or from the authors.
Acrylic Nanocomposite Resins for Use in Stereolithography and Structural Light Modulation Based Rapid Prototyping and Rapid Manufacturing Technologies†
Article first published online: 28 JUL 2008
Copyright © 2008 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
Advanced Functional Materials
Volume 18, Issue 16, pages 2390–2397, August 22, 2008
How to Cite
Gurr, M., Hofmann, D., Ehm, M., Thomann, Y., Kübler, R. and Mülhaupt, R. (2008), Acrylic Nanocomposite Resins for Use in Stereolithography and Structural Light Modulation Based Rapid Prototyping and Rapid Manufacturing Technologies. Adv. Funct. Mater., 18: 2390–2397. doi: 10.1002/adfm.200800344
- Issue published online: 19 AUG 2008
- Article first published online: 28 JUL 2008
- Manuscript Received: 11 MAR 2008
- Deutsche Forschungsgemeinschaft (DFG)
- Rapid prototyping;
A novel family of optically transparent acrylic nanocomposites containing up to 30 wt % silica nanoparticles with an average diameter of 20 nm was developed for application in structural light modulation (SLM) and stereolithography (SL) technologies. The uniform dispersion of nanoparticles affords a significantly improved toughness/stiffness-balance of the photopolymerized and postcured nanocomposites. It is possible to increase stiffness, as expressed by Young's modulus, from 1290 to 1700 MPa without encountering the embrittlement typical for many other conventional filled polymers. Fracture behaviour is examined by means of fracture mechanics investigation and SEM analyses of fracture surfaces. According to TEM analyses and measurement of optical transmittance remarkable uniform dispersion of silica nanoparticles was achieved. The silica nanoparticle concentrations up to 17 wt % give only marginally higher viscosities and do not affect transmittance, while slightly increasing the exposure times needed in photopolymerization. Moreover, the silica nanoparticles afford materials with reduced shrinkage and improved properties. The green effective ankle splay out (EASO) measured on H-shaped diagnostic specimens, is significantly reduced for the nanocomposite materials from 1.38 mm for the unfilled material to 0.82 mm for nanocomposites containing 30 wt % nanosilica. The building accuracy is increased significantly with increasing content of silica nanofillers.