NIR Sensitizer Operating under Long Wavelength (1064 nm) for Free Radical Photopolymerization Processes.,Macromolecular Rapid Communications

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NIR Sensitizer Operating under Long Wavelength (1064 nm) for Free Radical Photopolymerization Processes.
Macromolecular Rapid Communications ( IF 4.2 ) Pub Date : 2020-07-08 , DOI: 10.1002/marc.202000289
Haifaa Mokbel _{1,

2} , Bernadette Graff _{1,

2} , Frédéric Dumur ₃ , Jacques Lalevée _{1,

2}

Affiliation

Free radical polymerization upon near‐infrared (NIR) light is still the subject of intense research efforts and remains a huge challenge particularly for long wavelengths (>1000 nm). In this study, a NIR sensitizer operating upon long wavelength (1064 nm) is proposed for an efficient polymerization of acrylate monomers. A new three‐component photoinitiating system is developed comprising the NIR sensitizer in combination with an Iodonium salt (Iod) and an amine. Remarkably, the NIR sensitizer (IR 1064) absorbing strongly in all the near infrared region (700–1200 nm) offers the possibility to use a broad range of irradiation wavelengths, i.e., examples are provided at 785 and 1064 nm. Such long wavelengths are characterized by many advantages such as a deeper penetration of light and therefore a better curing of the monomer but it is also much safer than UV light. Excellent performance is observed for the three‐component IR 1064/Iod/Amine system under air: high conversion of acrylate functions associated with a fast polymerization time. The use of IR 1064 as NIR sensitizer with a broad NIR absorption is—to the best of current knowledge—never proposed in the literature. The photoinitiating performances are studied using real‐time Fourier transform infrared spectroscopy.

中文翻译：

用于自由基光聚合过程的长波长（1064 nm）下运行的NIR增感剂。

近红外（NIR）光下的自由基聚合仍是研究的重点，尤其对于长波长（> 1000 nm）仍然是巨大的挑战。在这项研究中，为使丙烯酸酯单体有效聚合，提出了在长波长（1064 nm）下工作的NIR敏化剂。开发了一种新的三组分光引发系统，该系统包含与碘盐（Iod）和胺结合的NIR敏化剂。值得注意的是，NIR敏化剂（IR 1064）在所有近红外区域（700-1200 nm）都具有强吸收性，从而有可能使用宽范围的照射波长，即提供了785和1064 nm的示例。如此长的波长的特征在于许多优点，例如更深的光穿透性以及因此单体的更好固化，但它也比紫外线安全得多。三组分IR 1064 / Iod / Amine系统在空气中观察到了优异的性能：丙烯酸酯功能的高转化率与快速的聚合时间相关。就目前所知，在文献中从未提出使用IR 1064作为具有广泛NIR吸收能力的NIR敏化剂。使用实时傅里叶变换红外光谱研究了光引发性能。就目前所知，在文献中从未提出使用IR 1064作为具有广泛NIR吸收能力的NIR敏化剂。使用实时傅里叶变换红外光谱研究了光引发性能。就目前所知，在文献中从未提出使用IR 1064作为具有广泛NIR吸收能力的NIR敏化剂。使用实时傅里叶变换红外光谱研究了光引发性能。

更新日期：2020-08-06

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