UV Absorption and Photoisomerization of p-Methoxycinnamate Grafted Silicone¶

Supason Pattanaargson; Nantawan Hongchinnagorn; Piyawan Hirunsupachot; Yongsak Sritana-anant

doi:10.1562/2003-11-14-RA-007.1

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Supason Pattanaargson,^1,* Nantawan Hongchinnagorn,¹ Piyawan Hirunsupachot,¹ Yongsak Sritana-anant¹

¹Department of Chemistry, Faculty of Science, Chulalongkorn University, Bangkok, Thailand

^**To whom correspondence should be addressed: Department of Chemistry, Faculty of Science, Chulalongkorn University, Bangkok 10330, Thailand. Fax: (662) 2187598; psupason@chula.ac.th

Abstract

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.

Citation Download Citation

Supason Pattanaargson, Nantawan Hongchinnagorn, Piyawan Hirunsupachot, and Yongsak Sritana-anant "UV Absorption and Photoisomerization of p-Methoxycinnamate Grafted Silicone," Photochemistry and Photobiology 80(2), 322-325, (1 September 2004). https://doi.org/10.1562/2003-11-14-RA-007.1

Received: 7 November 2003; Accepted: 1 May 2004; Published: 1 September 2004

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