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Synthesis and characterization of photocrosslinkable poly(organophosphazene)‐bearing cinnamyloxide side groups
Author(s) -
Choung Yun Sic,
Lee Ki Ho,
Lee Dong Choo
Publication year - 1999
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.11502
Subject(s) - polymer , pendant group , decomposition , spectroscopy , materials science , polymer chemistry , characterization (materials science) , crystallography , chemistry , organic chemistry , nanotechnology , physics , composite material , quantum mechanics
Two different poly(organophosphazene)s‐bearing single‐substituents (two cinnamyloxide side groups per repeating unit) and phenoxide‐co‐substituents (one phenoxide and one cinnamyloxide group per repeating unit) were prepared to study their photochemical reaction behavior. Structural formulas confirmed by the NMRs ( 1 H, 31 P) and IR were [ NP ( OCH 2 CH = CH C 6 H 5 ) 2 ] n ( I ) and [ NP ( OCH 2 CH = CH C 6 H 5 ) 0.8 ( O C 6 H 5 ) 1.2 ] n ( II ). Molecular characterization yielded \documentclass{article}\pagestyle{empty}\begin{document}$ \overline {M_w {\rm s}} $\end{document} of the order of 10 3 kg/mol for both the polymers. The onset temperature of decomposition found by TGA was about 250°C. DSC measurements gave T g s as 1°C for I and 3°C for II . Their photolytic crosslinking behaviors were monitored by UV spectroscopy. The single‐substituents polymer I showed a faster rate of photo reaction than the polymer II . The potential use for practical photosensitive application is considered to be greater for the polymer I .