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Radiation-Grafting of Thermo- and pH-Sensitive Poly(N-Vinylcaprolactam-co-Acrylic Acid) onto Silicone Rubber and Polypropylene Films

Published online by Cambridge University Press:  06 February 2014

Caroline C. Ferraz ,
Ademar B. Lugão ,
Gerardo Cedillo  and
Emilio Bucio
Caroline C. Ferraz
Affiliation:
Instituto de Pesquisas Energeticas e Nucleares – IPEN/CNEN-SP, Av. Prof. Lineu Prestes, 2242, Cidade Universitaria, 05508-000, Sao Paulo, Brazil.
Ademar B. Lugão
Affiliation:
Instituto de Pesquisas Energeticas e Nucleares – IPEN/CNEN-SP, Av. Prof. Lineu Prestes, 2242, Cidade Universitaria, 05508-000, Sao Paulo, Brazil.
Gerardo Cedillo
Affiliation:
Instituto de Investigaciones en Materiales, Universidad Nacional Autónoma de México, Circuito Exterior, Ciudad Universitaria, México DF 04510, México.
Emilio Bucio
Affiliation:
Departamento de Química de Radiaciones y Radioquímica, Instituto de Ciencias Nucleares, Universidad Nacional Autónoma de México, Circuito Exterior, Ciudad Universitaria, 04510, México D.F., México.
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Abstract

This work focuses on the effect of gamma-ray radiation conditions on the stimuli-responsive of polypropylene (PP) films and silicone (SR) rubber substrates grafted with N-vinylcaprolactam (NVCL) and acrylic acid (AAc). PP films and SR rubber were weighed and placed into glass ampoules and exposed to 60Co γ-source in the presence of air at room temperature, at dose rate around 12 kGy h-1 and dose between 5 and 70 kGy. Solutions of NVCL and AAc (1/1, v/v), 50 % monomer concentration (v/v) in toluene were added to the samples, the ampoules were degassed by repeated freeze-thaw cycles (5 times per 20 min) and sealed. The ampoules were heated at 60 or 70 °C at reaction time per 12 h. To extract the residual monomer and homopolymer formed during the grafting, the samples were soaked in ethanol for 24 h and then in distilled water, followed by drying under vacuum to constant weight. The values of grafting percentage achieved at a given irradiation dose were higher for SR than for PP. Samples where characterized by FTIR-ATR, DSC, swelling, LCST, and pH critical point.

Keywords

radiation effectspolymerbiomedical
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1613: Symposium 4D – New Trends in Polymer Chemistry and Characterization-2013 , 2014 , pp. 53 - 59
Copyright
Copyright © Materials Research Society 2014 

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References

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