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UV Absorption and Photoisomerixation of p ‐Methoxycinnamate Grafted Silicone ¶
Author(s) -
Pattanaargson Supason,
Hongchinnagorn Nantawan,
Hirunsupachot Piyawan,
Sritanaanant Yongsak
Publication year - 2004
Publication title -
photochemistry and photobiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.818
H-Index - 131
eISSN - 1751-1097
pISSN - 0031-8655
DOI - 10.1111/j.1751-1097.2004.tb00090.x
Subject(s) - silicone , copolymer , absorption (acoustics) , isomerization , solvent , chemistry , polymer chemistry , amide , hypsochromic shift , polymer , chromophore , nuclear chemistry , photochemistry , materials science , organic chemistry , catalysis , fluorescence , physics , quantum mechanics , composite material
p ‐Methoxycinnamate moieties, UV‐B‐absorptive chromophores of the widely used UV‐B filter, 2‐ethylhexyl p ‐methoxycinnamate (OMC), were grafted onto the 7 mol% amino functionalized silicone polymer through amide linkages. Comparing with OMC, the resulting poly [3( p ‐methoxycinnamido)(propyl)(methyl)‐dimethyl] siloxane copolymer (CAS) showed less E to Z isomerization when exposed to UV‐B light. The absorption profiles of the product showed the maximum absorption wavelength to be similar to that of OMC but with less sensitivity to the type of solvent. Poly (methylhydrosiloxane) grafted with 10 mol% p ‐methoxycinnamoyl moieties was prepared through hydrosilylations of 2‐propenyl‐ p ‐methoxycinnamate, in which the resulting copolymer showed similar results to those of CAS.