Abstract
4-Acryloyl-1,2,2,6,6-pentamethyl-piperidinol (APMP) is a reactive hindered amine that prolongs the service life of the polymeric materials and exhibits high stability, good resistance to extraction, and low toxicity. In this paper, a photoinduced free radical copolymerization of APMP and methyl methacrylate (MMA) is accomplished at ambient temperature in solution. APMP plays a key role in the copolymerization, owing to the nitroxides generated in situ from the moiety of 1,2,2,6,6-pentamethyl-piperidine under UV irradiation, and mediates the copolymerization, which is confirmed by the linear kinetics. With the increment of initial monomer feed ratios of APMP/MMA, both the copolymerization rate and the average molecular weight increase. According to the reactivity ratios from the extended Kelen-Tüdos (KT) method at high conversion by1H NMR spectroscopy, a nonlinear model is established and the sequential distribution in the copolymers is also investigated. The dispersion of APMP units is regulated by the feed ratios and reactivity ratios.
Highlights
Comparing with thermal process, the photoinduced polymerization is a generally economical and convenient technology that offers a number of advantages, including ambient temperature processing, fast curing, and spatial and temporal control over the polymerization [1]
The APMP-methyl methacrylate (MMA) copolymerization was performed under the light irradiation at ambient temperature
The results showed that unitary APMP units were dispersed in the MMA chains
Summary
The photoinduced polymerization is a generally economical and convenient technology that offers a number of advantages, including ambient temperature processing, fast curing, and spatial and temporal control over the polymerization [1] It has been used in extensive application, such as coating industry, paints or printing inks, adhesives, composite materials, and dental restorative formulations [2]. By the analysis of 1H NMR spectra, the reactivity ratios of the two monomers at high monomer conversions and the sequential distribution of poly(APMP-co-MMA) have been obtained [29] The study of this photoinduced copolymerization could be the guidance for the application of APMP derivatives as the reactive light stabilizers
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