N-Phenylglycine is normally used as a co-initiator
and can be photodecomposed by different dyes under UV or visible light
irradiation to generate radicals for the initiation of free radical
photopolymerization. However, the photochemistry and photoinitiation
ability of N-phenylglycine alone upon exposure to
near-UV light (e.g., UV LED at 392 nm), to the best of our knowledge,
have not been investigated. In this research, the photochemistry of N-phenylglycine under the UV LED at 392 nm is studied using
various approaches, and it reveals that radicals (PhNHCH2
•) can be produced from the direct photodecomposition
of N-phenylglycine. In addition, N-phenylglycine can also interact with iodonium salt under the UV
LED at 392 nm to generate phenyl radicals and cations. These formed
active species exhibit high performance to initiate the free radical
photopolymerization of acylates and cationic photopolymerization of
epoxides and divinyl ethers.
The terpolymer was synthesized by AM, AA and AMPS. The effects of the content of AA and AMPS, the amount of initiator, the neutralization degree, reaction temperature, reaction time and monomer concentration on terpolymer viscosities were studied. Then it draws the best conditions of this polymerization: monomer quality ratio(AM:AMPS: AA) is 10:2:1, the amount of initiator is between 0.20% and 0.25%, the neutralization degree is 90%, the reaction temperature is 30°C , the reaction time is 4 hours, the total monomer concentration is 21%. Finally, it draws a conclusion that the polymer is a kind of terpolymer which is synthesized by AM, AA and AMPS with the help of the IR spectroscopy.
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