UV absorption and photoisomerization of p-methoxycinnamate grafted silicone.
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.
Pattanaargson
Supason
S
Department of Chemistry, Faculty of Science, Chulalongkorn University, Bangkok 10330, Thailand. psupason@chula.ac.th
Hongchinnagorn
Nantawan
N
Hirunsupachot
Piyawan
P
Sritana-anant
Yongsak
Y
D002934:Cinnamates / Q000737:chemistry*; D007536:Isomerism; D015394:Molecular Structure; D010777:Photochemistry; D012828:Silicones / Q000737:chemistry*; D013057:Spectrum Analysis; D014466:Ultraviolet Rays
D002934:Cinnamates; D012828:Silicones; C509256:poly((propyl-4-methoxycinnamate methyl)(octyl methyl))siloxane copolymer