State Key Laboratory of Molecular Engineering of Polymers, Department of Macromolecular Science, Fudan University, Shanghai, 200438, P. R. China.
Chem Asian J. 2021 Aug 2;16(15):2048-2054. doi: 10.1002/asia.202100468. Epub 2021 Jun 14.
Photopolymerization of diacetylenes usually requires stringent reaction conditions like high energy irradiation of 254-nm light or even γ-rays, which are generally harmful to the human body and thus mild conditions with lower energy irradiation are required. In this study, different diphenyldiacetylene (DPDA) derivatives were rationally designed followed by the investigation of their photopolymerization behavior. It was found that the para-substituted amino groups could render the absorption band of DPDA bathochromically shifted, ensuring a 365-nm light wavelength coverage. On this basis, an organogel system was constructed by chemically modifying cholesteryl and lipoic acid onto the DPDA moiety in aromatic solvents. Such uniform self-assemblies further facilitated to a rather high degree of polymerization by 365-nm irradiation. As a kind of fluorescent materials, the whole polymerization process of this system can be visualized by a photoluminescent signal.
二炔的光聚合通常需要严格的反应条件，如 254nm 光的高强度辐照，甚至γ射线辐照，这些通常对人体有害，因此需要低能量辐照的温和条件。在这项研究中，合理设计了不同的二苯二乙炔（DPDA）衍生物，并研究了它们的光聚合行为。结果发现，对位取代的氨基可以使 DPDA 的吸收带红移，确保 365nm 光波长的覆盖。在此基础上，通过化学修饰胆固醇和硫辛酸到 DPDA 部分在芳香族溶剂中构建了一个有机凝胶体系。这种均匀的自组装进一步促进了聚合度的提高，通过 365nm 的辐照达到相当高的程度。作为一种荧光材料，该体系的整个聚合过程可以通过光致发光信号可视化。
