Abstract
A two-photon polymerization initiator is a kind of nonlinear optical material. With the demand for more efficient initiators in two-photon polymerization additive manufacturing, there are more and more related studies. In this paper, four conjugate-extended two-photon polymerization initiators with different alkane chain lengths were designed and synthesized, and single-photon, two-photon, and photodegradation experiments were carried out. Additive manufacturing experiments illustrated that the designed molecules can be used as two-photon initiators, and the writing speed can achieve 100,000 μm/s at a laser power of 25 mW. Through theoretical calculation and experimental comparison of the properties of molecules with different conjugation degrees, it was proven that a certain degree of conjugation extension can improve the initiation ability of molecules; however, this improvement cannot be extended infinitely. Solubility tests of different acrylates showed that molecules with different alkane chain lengths have varying solubility. Changing the molecular alkane chain length may be favorable to adapt to different monomers.
Highlights
Two-photon absorption is a third-order nonlinear optical effect that has a wide range of uses
two-photon polymerization additive manufacturing (TPPAM) has a growing number of applicaitons, which highlights the new requirements for its manufacturing speed
TPPAM was carried out to be tested in polymerization a two-photon polymerization experiment
Summary
Two-photon absorption is a third-order nonlinear optical effect that has a wide range of uses. Two-photon polymerization additive manufacturing (TPPAM) is extensively used in many three-dimensional precision structure manufacturing fields—. Such as those of photonic crystals [1,2], micro-optical elements [3,4], three-dimensional high-density information storage [5–7], biocompatible devices [8–10], etc.—due to its unique ultra-high-resolution performance. TPPAM has a growing number of applicaitons, which highlights the new requirements for its manufacturing speed. Since TPPAM is a manufacturing method in which dots form lines and lines form surfaces, making larger structures takes a lot of time to manufacture. The speed of writing in manufacturing is extremely significant. A larger writing speed can improve manufacturing efficiency and save time
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