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Peng C.,Changzhou University | Wang K.-M.,Changzhou University | Lu J.,Changzhou University | Qian X.-C.,Changzhou Tronly New Electronic Materials Co. | And 3 more authors.
Yingxiang Kexue yu Guanghuaxue/Imaging Science and Photochemistry

The photopolymerization kinetics of combination photoinitiator systems which were composed by 2, 2', 5-tris(2-fluorophenyl)-4-(3, 4-dimethoxypheny)-4', 5'-diphenyl-1, 1'-biimdazole (WJ-HABI), photosensitizer N, N-bis(diethylamino) benzophenone (EMK) and hydrogen donors N-pheylglycine (NPG) were investigated by Real-time Infrared (RT-IR) spectroscopy. The different initiator concentrations, the different compositions of photoinitiator systems, light intensity and different functional monomers on the polymerization were studied. The results indicated that with the increase of initiator concentration and light intensity, the double bond conversion and the polymerization rate increased. Source

Song G.-Q.,Changzhou University | Chen X.,Changzhou University | Shen L.,Changzhou University | Hu C.-Q.,Changzhou Tronly New Electronic Materials Co.
Xiandai Huagong/Modern Chemical Industry

Bisphenol fluorene acrylate plays an important role in the synthesis of the optical resin material. In this study, 9, 9'-bis (4-hydroxyphenyl) fluorene (bisphenol fluorene, I) is synthesized with fluorenone and phenol as raw material. 9, 9'-Bis(4-oxiranylmethoxyphenyl) fluorene (bisphenol fluorene diglycidyl ether epoxy resin, II) is prepared by the reaction of I with epichlorohudrin. Finally, II reacts with acrylic acid to get 9, 9'-bis[4-(2'-hydroxy-3'acryloyloxy-propoxy)phenyl] fluorene (Bisphenol fluorene acrylic resin, III). The results indicate that the yield of I is more than 95.6% and the purity is up to 99.0% when using the acid catalyzed process and the weak base in the post-process. Moreover, in the presence of dimethylimidazole, the yield of II is up to 92.8% and the purity is more than 96.5%. Finally, when using tetrabutylammonium bromide as the catalyst and methoxyphenol as the inhibitor agent, the purity of III is 96.0% and the yield is 93.0%. The total yield of three steps is 83.0%. The clean production technology is optimized by studying the main factors affecting the reactions. Source

Wu W.-T.,Changzhou University | Ma G.-P.,Changzhou Institute of Advanced Materials | Lu J.,Changzhou University | Fang D.-W.,Changzhou University | And 3 more authors.
Yingxiang Kexue yu Guanghuaxue/Imaging Science and Photochemistry

2, 2', 4-(2-chlorophenyl)-5-(3, 4-dimethoxyphenyl)-4', 5'-diphenyl-1, 1'-two imidazole (CZ-HABI) is a highly efficient UV initiator. Its characteristics were investigated by FTIR and 1HNMR and UV absorption spectra. The compound photointiator systems consisted of photoinitiator 2, 2', 4-(2-chlorophenyl)-5-(3, 4-dimethoxyphenyl)-4', 5'-diphenyl-1, 1'-two imidazole (CZ-HABI), photosensitizer 4, 4'-bis (diethylamino)benzophenone(EMK) and hydrogen donor N-phenyl glycine (NPG). Real time infrared spectroscopy (RT-IR) was used to study the effect of polymerized kinetics of compound photointiator systems. The results indicated that basically no initiation efficient without hydrogen donor, while the effect of initiation efficient boosted greatly in the case of adding hydrogen donor. When concentration of compound photointiator systems increased, the conversion rate of the double bond can been enhanced. Its maximum polymerization rate accorded with the direct proportion relationship of Rp∝(PI)1/2. The conversion rate of the double bond of the monomer and maximum reaction rate were enlarged accompanying with the light intensity strengthened. The final conversion rate of the double bond of diacrylate monomer was higher than that of triacrylate monomer. Initiator efficiency of complex photoinitiator system was better than conventional ITX/EDAB initiator system, and similar to initiator efficiency of 184, 1173. Source

Changzhou Tronly New Electronic Materials Co. | Date: 2015-11-24

Chemicals used in industry; photographic sensitizers; photographic developers.

Ma G.,Beijing University of Chemical Technology | Ma G.,Changzhou Institute of Advanced Materials | Qian B.,Changzhou Tronly New Electronic Materials Co. | Yang J.,Changzhou Tronly New Electronic Materials Co. | And 3 more authors.
International Journal of Biological Macromolecules

A novel chitosan derivative carrying the benzene group was synthesized by Michael reaction. The chemical structures of the compounds were characterized by FT-IR, UV-vis spectrometry, XRD, elemental analysis, and 1H NMR spectroscopy in detail. The degree of substitution (DS) of chitosan derivative was calculated by elemental analysis. The UV-vis results indicated that the derivatives had ultraviolet absorption at 265 and 273nm. XRD analysis showed that the derivatives were amorphous. The derivatives could dissolve in water. Taking advantage of the known capacity of solubility and ultraviolet absorption, the chitosan derivatives opened new possibilities for use as a sunscreen. © 2010. Source

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