Chen Hong, Vahdati Mehdi, Xiao Pu, Dumur Frédéric, Lalevée Jacques
Université de Haute-Alsace, CNRS, IS2M UMR 7361, F-68100 Mulhouse, France.
Université de Strasbourg, F-67200 Strasbourg, France.
Polymers (Basel). 2021 Sep 21;13(18):3195. doi: 10.3390/polym13183195.
The development of visible-light 3D printing technology by using water-soluble initiating systems has attracted widespread attention due to their potential applications in the manufacture of hydrogels. Besides, at present, the preparation of water-soluble photoinitiators suitable for visible light irradiation (such as LEDs) still remains a challenge. Therefore, this work is devoted to developing water-soluble photoinitiators (PI)/photoinitiating systems (PIS) upon irradiation with a LED @ 405 nm. In detail, a new water-slightly-soluble chalcone derivative dye [()-3-(4-(dimethylamino) phenyl)-1-(4-(2-(2-(2-methoxyethoxy) ethoxy) ethoxy) phenyl) prop-2-en-1-one] was synthesized here and used as a PI with a water-soluble coinitiator, i.e., triethanolamine (TEA) which was also used as an electron donor. When combined together, a charge transfer complex (CTC) formed immediately which exhibited excellent initiating ability for the free radical photopolymerization of poly(ethyleneglycol)diacrylate (PEG-DA). In light of the powerful CTC effect, the [dye-TEA] CTC could not only exhibit enhanced water solubility and mechanical properties but could also be effectively applied for 3D printing. This CTC system is environmentally friendly and cost-saving which demonstrates a great potential to prepare hydrogels via photopolymerization.
利用水溶性引发体系开发可见光3D打印技术因其在水凝胶制造中的潜在应用而受到广泛关注。此外，目前，制备适用于可见光照射（如发光二极管）的水溶性光引发剂仍然是一个挑战。因此，这项工作致力于开发在405 nm发光二极管照射下的水溶性光引发剂（PI）/光引发体系（PIS）。具体而言，在此合成了一种新的微溶于水的查尔酮衍生物染料[（）-3-（4-（二甲基氨基）苯基）-1-（4-（2-（2-（2-甲氧基乙氧基）乙氧基）乙氧基）苯基）丙-2-烯-1-酮]，并将其用作PI，与一种水溶性共引发剂即三乙醇胺（TEA）一起使用，TEA也用作电子供体。当两者结合时，立即形成电荷转移络合物（CTC），该络合物对聚乙二醇二丙烯酸酯（PEG-DA）的自由基光聚合表现出优异的引发能力。鉴于强大的CTC效应，[染料-TEA] CTC不仅可以表现出增强的水溶性和机械性能，还可以有效地应用于3D打印。该CTC体系环境友好且成本低廉，显示出通过光聚合制备水凝胶的巨大潜力。
