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Revista mexicana de física
Print version ISSN 0035-001X
Rev. mex. fis. vol.56 n.6 México Dec. 2010
Investigación
Non linear optical properties of novel amphiphilic azopolymers bearing well defined oligo (ethylene glycol) spacers
O.G. MoralesSaavedraª, T. Garcíab, C. Caicedob and E. Riverab
ª Centro de Ciencias Aplicadas y Desarrollo Tecnológico, Universidad Nacional Autónoma de México, Circuito Exterior Ciudad Universitaria México, D.F., 04510 México email: omar.morales@ccadet.unam.mx
b Instituto de Investigaciones en Materiales, Universidad Nacional Autónoma de México, Circuito Exterior Ciudad Universitaria México D.F., 04510 México, FAX: (5255) 56 16 12 01; Tel: (5255) 56 22 47 33, email: tutu_gt@yahoo.com.mx; carolina.caicedo@gmail.com; riverage@iim.unam.mx
Recibido el 5 de abril de 2010
Aceptado el 23 de septiembre de 2010
Abstract
Non linear optical (NLO) properties of a new series of pnPEGMAN polymers: p2PEGMAN or Poly[(E)2(2(methyl(4((4nitrophenyl) diazenyl)phenyl) amino)ethoxy)ethyl methacrylate], p3PEGMAN or Poly[(E)2(2(2(methyl(4((4nitrophenyl)diazenyl)phenyl) amino) ethoxy)ethoxy)ethyl methacrylate], p4PEGMAN or Poly[(E)2(4((4nitrophenyl)diazenyl)phenyl)5,8,11trioxa2azatridecan13yl methacrylate] and p6PEGMAN or Poly[(E)2(4((4nitrophenyl) diazenyl) phenyl) 5,8,11,14,17pentaoxa 2azanonadecan 19yl methacrylate] were studied by the ZScan technique. These azopolymers exhibited high χ(3) NLOresponses with excitation below the resonance absorption region of the polymers and the evaluated n2values are in the order of 104 to 105 esu, with negative sign for all the studied materials.
Keywords: Polymers; azobenzene; poly(ethylene glycol); optical properties.
Resumen
Las propiedades ópticas no lineales (ONL) de una nueva serie de polímeros pnPEGMAN: p2PEGMAN o poli[(E)2(2(metil(4((4nitrofenil)diazenil)fenil) amino)etoxi)etilmetacrilato], p3PEGMAN o poli[(E)2(2(2(metil(4((4nitrofenil)diazenil)fenil)amino) etoxi) etoxi)etilmetacrilato], p4PEGMAN o poli[(E)2(4((4nitrofenil)diazenil)fenil)5,8,11trioxa2azatridecan13il metacrilato] y p6 PEGMAN o poly[(E)2(4((4nitrofenil) diazenil)fenil)5,8,11,14,17pentaoxa2azanonadecan 19il metacrilato] fueron estudiadas mediante la técnica de ZScan. Estos azopolímeros mostraron una alta respuesta de ONL del tipo χ(3)a una excitación por debajo de la zona de absorción de los polímeros y sus valores de n2 fueron evaluados en el orden de 104 a 105 esu, con signo negativo para todos los materiales estudiados.
Descriptores: Polímeros; azobenceno; poly(ethylene glycol); propiedades ópticas.
PACS: 78.30.Jw; 78.20.e; 74.25.Gz
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Acknowledgements
We are grateful to Miguel Canseco for his help with UVvis spectroscopy. This project was financially supported by PAPIITDGAPA (Projects IN105610). O.G. MoralesSaavedra acknowledges financial support from CONACyT (grant: 82808F).
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