期刊
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
卷 204, 期 -, 页码 234-244出版社
ELSEVIER
DOI: 10.1016/j.ijbiomac.2022.01.199
关键词
Dealkaline lignin; Macromolecular photoinitiator; Low migration; Biosafety; Ultraviolet-blocking film
资金
- Austrian-Chinese Cooperative RD Project [GJHZ1720]
- Chinese Academy of Sciences (CAS)
A lignin-based polymerizable macromolecular photoinitiator was designed and synthesized, which exhibited excellent initiation performance, low migration, and could be used for preparing environmentally friendly UV-blocking films and biosafety coatings.
Developing high-efficient visible light macromolecular photoinitiator (macro PI) with excellent initiation per-formance, low migration, high biosafety and multi-function is beneficial to broaden the application of photo-polymer. Lignin contains chromophores which could generate free radicals under light irradiation. In this study, a lignin-based polymerizable macro PI (DAL-11ene-amine) was designed and synthesized through covalent grafting 10-undecenoyl chloride (11ene) and hydrogen donor 4-(dimethylaminobenzoic acid) ethyl ester (EDAB) into dealkaline lignin (DAL) skeleton. The structure of DAL-11ene-amine was characterized by UV-vis, FTIR, H-1 NMR, GPC, and P-31 NMR spectra. Under the irradiation of a 405 nm LED, DAL-11ene-amine can directly produce active species and initiate the polymerization of acrylate monomers or thiol-ene click reaction. The photo-initiation efficiency of DAL-11ene-amine is higher than that of DAL-11ene or the two-component combination of DAL-11ene and EDAB. Using DAL-11ene-amine as PI, the prepared polymer films exhibit excellent UV-blocking property. With only 0.5 wt% addition of DAL-11ene-amine, nearly 100% of UVB + UVC and the most of UVA can be blocked by the films. Moreover, DAL-11ene-amine exhibits higher migration stability and biosafety because it can be covalently linked into polymer cross-linking networks. The results indicate that DAL-11ene-amine has great application potentials in preparing environmentally friendly UV-blocking films and biosafety coatings.
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