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Preparation of Reactive Three‐Dimensional Microstructures via Direct Laser Writing and Thiol‐ene Chemistry
Author(s) -
Quick Alexander S.,
Fischer Joachim,
Richter Benjamin,
Pauloehrl Thomas,
Trouillet Vanessa,
Wegener Martin,
BarnerKowollik Christopher
Publication year - 2013
Publication title -
macromolecular rapid communications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.348
H-Index - 154
eISSN - 1521-3927
pISSN - 1022-1336
DOI - 10.1002/marc.201200796
Subject(s) - photoinitiator , scanning electron microscope , polymerization , materials science , microstructure , photopolymer , ene reaction , x ray photoelectron spectroscopy , grafting , polymer chemistry , polymer , chemical engineering , monomer , chemistry , organic chemistry , composite material , engineering
Abstract Three‐dimensional microstructures are fabricated employing the direct laser writing process and radical thiol‐ene polymerization. The resin system consists of a two‐photon photoinitiator and multifunctional thiols and olefins. Woodpile photonic crystals with 22 layers and a rod distance of 2 μm are fabricated. The structures are characterized via scanning electron microscopy and focused ion beam milling. The thiol‐ene polymerization during fabrication is verified via infrared spectroscopy. The structures are grafted in a subsequent thiol‐Michael addition reaction with different functional maleimides. The success of the grafting reaction is evaluated via laser scanning microscopy and X‐ray photoelectron spectroscopy. The grafting density is calculated to be close to 200 molecules μm −2 .