Tri(ethylene glycol) divinyl ether and the spiro-orthoester 2-((allyloxy)methy)-1,4,6-trioxospiro[4.4]nonane can be formulated in different ratios and crosslinked by thiol-ene reactions. The spiro-orthoester is used as anti-shrinkage additive, enabling shrinkage reduction of up to 39%. Addition of a radical photoinitiator for the thiol-ene reaction and a cationic photoinitiator for the double ring-opening of the spiro-orthoester enables dual-curing for application in 3D-printing. The formulation free of the spiro-orthoester shows gelation during the printing process and, correspondingly, low resolution. The formulations containing the spiro-orthoester exhibit higher resolutions in the range of 50 µm. The resins containing mixtures of tri(ethylene glycol) divinyl ether and the spiro-orthoester show permittivities as high as 104. The dielectric loss factor of the resins is in the range of 0.5–7.6, and the conductivity in the range of 1.3⋅10−11 to 2.0⋅10−11 S cm−1. These high-κ materials can be 3D-printed by digital light processing for the next generation of electronic materials.
3D-Printing of High-κ Thiol-Ene Resins with Spiro-Orthoesters as Anti-Shrinkage Additive / Marx, P.; Romano, A.; Roppolo, I.; Chemelli, A.; Muhlbacher, I.; Kern, W.; Chaudhary, S.; Andritsch, T.; Sangermano, M.; Wiesbrock, F.. - In: MACROMOLECULAR MATERIALS AND ENGINEERING. - ISSN 1438-7492. - ELETTRONICO. - 304:12(2019), pp. 1900515-1900524. [10.1002/mame.201900515]
|Titolo:||3D-Printing of High-κ Thiol-Ene Resins with Spiro-Orthoesters as Anti-Shrinkage Additive|
|Data di pubblicazione:||2019|
|Digital Object Identifier (DOI):||http://dx.doi.org/10.1002/mame.201900515|
|Appare nelle tipologie:||1.1 Articolo in rivista|