Visible Light Pulsed-OPO-Laser Polymerization at 450 nm Employing a Bis(acylphosphine oxide) Photoinitiator

Autor:	Gregory T. Russell, Thomas P. Davis, Michael D. Zammit, Mark T. L. Rees
Rok vydání:	1998
Předmět:	chemistry.chemical_classification Polymers and Plastics Bulk polymerization Organic Chemistry Radical polymerization Polymer Photochemistry Styrene Inorganic Chemistry chemistry.chemical_compound Photopolymer Polymerization chemistry Materials Chemistry Photoinitiator Visible spectrum
Zdroj:	Macromolecules. 31:1763-1772
ISSN:	1520-5835 0024-9297
DOI:	10.1021/ma971370j
Popis:	The free-radical propagation rate coefficients of both methyl methacrylate (MMA) and styrene (STY) have been measured using a new version of pulsed-laser polymerization (PLP) employing a visible light wavelength (450 nm) generated by a Nd:YAG laser pumped oscillator/power oscillator (OPO). The initiator bis(2,6-dimethoxybenzoyl)(2,4,4-trimethylpentyl)phosphine oxide (BAPO) successfully initiated the polymerizations, and propagation rate coefficients were obtained which are in excellent agreement with values recommended as benchmark values by an IUPAC working party. However the polymer molecular weight distributions were somewhat different from those usually obtained from successful UV−PLP experiments, there being a significant contribution from higher molecular weight overtones, particularly in STY experiments. This was investigated by carrying out simulations of the PLP process, ones aimed in particular at examining an unusual feature of BAPO-initiated polymerizations: that reinitiatable groups are expe...
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::ceefdb4e811f2347ef5bc0369e625e01 https://doi.org/10.1021/ma971370j Zobrazit plný text záznamu