Abstract
AbstractIt is reported that efficient photoinitiators, suitable for two‐photon polymerization, can be obtained using the copper catalyzed azide/alkyne cycloaddition reaction. This click chemistry strategy provides a modular approach to the assembly of photoinitiators that enables the rapid variation of key fragments to produce photoinitiators with desirable properties. To assess the performance of the first‐in‐class photoinitiators generated by this approach, a screening method is developed to enable the rapid determination of polymerization and damage thresholds in numerous photoresists during two‐photon polymerization. The degree of consumption of vinyl groups (DC) and homogeneity of the polymerization are further assessed by micro‐Raman spectroscopy. Finally, more complex structures are fabricated to demonstrate that the efficient two‐photon polymerization of stable 3D microarchitectures can be achieved using triazole‐based photoinitiators.
Highlights
That are commonly associated with the copper catalyzed azide/ alkyne cycloaddition (CuAAC) reaction
This reaction has become almost synonymous with the concept of “click chemistry”; a philosophy that aims to develop general, selective, and high yielding reactions to expedite chemical synthesis.[12]
Only a selection of these materials have been studied for multiphoton processes[15e] and to the best of our knowledge, the CuAAC reaction has never been employed for the synthesis of photoinitiators for two-photon polymerization
Summary
1. Introduction polymerization, can be obtained using the copper catalyzed azide/alkyne cycloaddition reaction. Introduction polymerization, can be obtained using the copper catalyzed azide/alkyne cycloaddition reaction This click chemistry strategy provides a modular approach to the assembly of photoinitiators that enables the rapid variation of key fragments to produce photoinitiators with desirable properties. To assess the performance of the first-in-class photoinitiators generated by this approach, a screening method is developed to enable the rapid. More complex structures are fabricated to demonstrate that the efficient two-photon polymerizaerization is the most precise 3D printing technique, enabling feature sizes below the diffraction limit of light (
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