G Model
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area as a function of heating time, as given in Fig. 7. No marked
spectral alteration was observed within 9 min, but the absorption
band of epoxide abruptly decreased thereafter, and 80% conversion
was obtained after 100 min baking. These results indicate that the
crosslinking reaction of E51 can be induced by the photogenerated
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Benzoylformamides (BFAs) derivatives as novel photocaged
bases weredesignedand synthesized. Initiallytheir structureswere
confirmed by 1H NMR, 13C NMR, and elemental analysis. Next, we
detail their thermal stability, solubility behavior and photolysis
products. The results show that BFAs have good thermal stability at
room temperature and exhibit sufficient solubility in epoxy resin
E51. Meanwhile, photolysis products of BFA-dBA are identified as
benzaldehyde, N-benzylidenebenzylamine, N-dibenzylamine and
some unknown substances. Furthermore, the model photo-latent
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caged base has been investigated, and 80% conversion was obtained
at 100 min baking after UV-exposure of 10 min. This photodecom-
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Acknowledgments
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[26] M. He, X. Huang, Z. Zeng, J. Yang, Phototriggered base proliferation: a highly 356
efficient domino reaction for creating functionally photo-screened materials, 357
276 Q2
277
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This research was financially supported by National Natural
Science Foundation of China (No. 21374135), China Postdoctoral
Science Foundation (No. 2013M542178 and 2014M562183), the
Open Foundation of the State Key Laboratory of Pulp and Paper
Engineering in South China University of Technology (No.
C713043z), and the Fundamental Research Funds for the Central
Universities (No. 2013ZB0025).
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Please cite this article in press as: M.-H. He, et al., Benzoylformamides as new photocaged bases for photo-latent anion polymerization,