Investigación

 

Non linear optical properties of novel amphiphilic azo–polymers bearing well defined oligo (ethylene glycol) spacers

 

O.G. Morales–Saavedraª, T. García^b, C. Caicedo^b and E. Rivera^b

 

ª Centro de Ciencias Aplicadas y Desarrollo Tecnológico, Universidad Nacional Autónoma de México, Circuito Exterior Ciudad Universitaria México, D.F., 04510 México e–mail: 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, e–mail: 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–((4–nitrophenyl) diazenyl)phenyl) amino)ethoxy)ethyl methacrylate], p3PEGMAN or Poly[(E)–2–(2–(2–(methyl(4–((4–nitrophenyl)diazenyl)phenyl) amino) ethoxy)ethoxy)ethyl methacrylate], p4PEGMAN or Poly[(E)–2–(4–((4–nitrophenyl)diazenyl)phenyl)–5,8,11–trioxa–2–azatridecan–13–yl methacrylate] and p6PEGMAN or Poly[(E)–2–(4–((4–nitrophenyl) diazenyl) phenyl) –5,8,11,14,17–pentaoxa –2–azanonadecan –19–yl methacrylate] were studied by the Z–Scan technique. These azo–polymers exhibited high χ⁽³⁾ NLO–responses with excitation below the resonance absorption region of the polymers and the evaluated n₂–values are in the order of 10^—4 to 10^—5 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–((4–nitrofenil)diazenil)fenil) amino)etoxi)etilmetacrilato], p3PEGMAN o poli[(E)–2–(2–(2–(metil(4–((4–nitrofenil)diazenil)fenil)amino) etoxi) etoxi)etilmetacrilato], p4PEGMAN o poli[(E)–2–(4–((4–nitrofenil)diazenil)fenil)–5,8,11–trioxa–2–azatridecan–13–il metacrilato] y p6 PEGMAN o poly[(E)–2–(4–((4–nitrofenil) diazenil)fenil)–5,8,11,14,17–pentaoxa–2–azanonadecan –19–il metacrilato] fueron estudiadas mediante la técnica de Z–Scan. Estos azo–polímeros 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 10^—4 a 10^—5 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 UV–vis spectroscopy. This project was financially supported by PAPIIT–DGAPA (Projects IN–105610). O.G. Morales–Saavedra acknowledges financial support from CONACyT (grant: 82808–F).

 

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