Photosensitive 2,5-distyrylpyrazine particles produced from rapid expansion of supercritical solutions

Autor:	Gary Tepper, Dmitry Pestov, Royal Kessick, Natalia Levit
Rok vydání:	2003
Předmět:	chemistry.chemical_classification Polymers and Plastics Precipitation (chemistry) Organic Chemistry Chlorodifluoromethane Sulfuric acid Polymer Supercritical fluid chemistry.chemical_compound Monomer Photopolymer chemistry Chemical engineering Polymer chemistry Materials Chemistry Particle size
Zdroj:	Polymer. 44:3177-3183
ISSN:	0032-3861
DOI:	10.1016/s0032-3861(03)00279-9
Popis:	Solvent-free, photoreactive particles of 2,5-distyrylpyrazine (DSP) monomer were developed by rapid precipitation from an expanding supercritical chlorodifluoromethane solution. DSP polymer particles were produced by solid-state photopolymerization. DSP particles below a critical diameter of about 0.5 μm were found to be mechanically stable and did not fragment upon photopolymerization. The rate of DSP photopolymerization was shown to be size-sensitive. Nano-scale particles demonstrated superior photoreactivity in the solid state in comparison to micro-scale crystals. UV spectra of DSP at different degrees of conversion were investigated and the extinction coefficients were calculated for the DSP monomer and polymer in sulfuric acid.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::19d84b40c38c7f903001727a43bb3ca9 https://doi.org/10.1016/s0032-3861(03)00279-9 Zobrazit plný text záznamu Full Text from ScienceDirect