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Issue 43, 2017
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Silyl-based initiators for two-photon polymerization: from facile synthesis to quantitative structure–activity relationship analysis

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Abstract

Exploring new initiation functionalities is critical for the design of efficient photoinitiators applied in two-photon polymerization. In this paper, we present a facile and effective synthesis strategy to construct silyl-based two-photon initiators (2PIs) containing nitro groups as electron acceptors, alkylamines as electron donors and double bonds as conjugation bridges. Steady-state absorption, time-resolved fluorescence, and ns-transient absorption were employed to quantitatively investigate the photo-physics and -chemistry of the 2PIs. The results showed that the photophysical and photochemical behavior of these 2PIs is marginally affected by the introduction of a silyl group, but strongly depends on solvent polarity. The nonlinear absorption spectra over a broad spectral range were determined via two-photon-induced fluorescence, revealing maximum two-photon cross sections of ∼90 GM. In two-photon polymerization structuring tests, the 2PIs can be employed to build fine 3D microstructures with a resolution of ∼280 nm. The acrylate formulations containing novel 2PIs exhibit a comparable threshold energy and ideal processing windows as commercial photoresists IP-L, which have been specifically designed for Nanoscribe's laser lithography systems.

Graphical abstract: Silyl-based initiators for two-photon polymerization: from facile synthesis to quantitative structure–activity relationship analysis

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Publication details

The article was received on 13 Aug 2017, accepted on 11 Oct 2017 and first published on 23 Oct 2017


Article type: Paper
DOI: 10.1039/C7PY01360D
Citation: Polym. Chem., 2017,8, 6644-6653
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    Silyl-based initiators for two-photon polymerization: from facile synthesis to quantitative structure–activity relationship analysis

    Z. Li, A. Rosspeintner, P. Hu, G. Zhu, Y. Hu, X. Xiong, R. Peng, M. Wang, X. Liu and R. Liu, Polym. Chem., 2017, 8, 6644
    DOI: 10.1039/C7PY01360D

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