Navegar

Colección

Datos Estadísticas

Artículo

Estamos trabajando para incorporar este artículo al repositorio
Consulte el artículo en la página del editor
Consulte la política de Acceso Abierto del editor

Abstract:

A study is made of the thermal expansion coefficient and the glass transition temperature in atactic polymethylmethacrylate (PMMA) irradiated first with γ-ray doses between 50 and 200 kGy, The change of the molecular weight due to the damage of the polymer chain produced by the γ-irradiation was also measured. Besides the glass transition temperature, the α′ transition is observed in our dilatometric tests and this transition shifts to lower values of temperatures at higher doses and virtually disappears at 200 kGy. This result suggests that the irradiation changes the degree of atacticity of the polymer.

Registro:

Documento: Artículo
Título:Thermal expansion and glass transition of polymethylmethacrylate after exposure to 60Co gamma irradiation
Autor:Marzocca, A.J.; Goyanes, S.N.; Iglesias, M.M.; Villar, J.E.
Filiación:Lab. Propiedades Mecanicas Poli. M., Dpto. Física, Universidad de Buenos Aires, Pabellón 1, 1428 Buenos Aires, Argentina
Palabras clave:Cobalt; Dilatometers; Gamma rays; Glass transition; Irradiation; Molecular weight; Polymers; Temperature; Testing; Thermal expansion; Cobalt gamma irradiation; Dilatometric tests; Polymethyl methacrylates
Año:1996
Volumen:15
Número:2
Página de inicio:179
Página de fin:187
DOI: http://dx.doi.org/10.1016/0142-9418(95)00030-5
Título revista:Polymer Testing
Título revista abreviado:Polym Test
ISSN:01429418
CODEN:POTED
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_01429418_v15_n2_p179_Marzocca

Referencias:

  • Todd, A., The mechanisms of radiation-induced changes in vinyl polymers (1960) J. Polym. Sci., 42, p. 223
  • Charlesby, A., Thomas, D.K., A comparison of the effects of ultra-violet and gamma radiation in polymethyl methactylale (1962) Proc. Roy. Soc., A269, p. 104
  • Charlesby, A., Moore, N., Comparison of gamma and ultra-violet radiation effects in polymethyl methactylate at higher temperatures (1964) Int. J. Appl. Rad. Isot., 15, p. 703
  • Choi, J.O., Moore, J.A., Corelli, J.C., Silverman, J.P., Bakhru, H., Degradation of poly (methyl methacrylate) by deep ultraviolet X-ray electron beam and proton beam irradiations (1988) J. Vac. Sci. Technol., B6, p. 2286
  • Kohjiya, S., Matsumura, Y., Yamashita, S., Matsuyama, T., Yamaoka, H., Gamma-ray induced deterioration of natural rubber vulcanizates (1984) J. Mater. Sci. Lett., 3, p. 121
  • Peschanskaya, N.N., Smolyanskyii, A.S., Surovova, V.Yu., Deformation of polymethylmethacrylate after exposure 60Co γ (1993) Phys. Sol. State, 35, pp. 1222-1224
  • Roberts, G.E., White, E.F.T., Relaxation processes in amorphous polymers (1973) The Physics of Glassy Polymers, p. 153. , ed. R.N. Haward, Appl. Sci. Publ. Ltd, London
  • Wittmann, J.C., Kovacs, A.J., (1969) J. Polym. Sci., 16, p. 4443
  • Havriliak, S., (1968) Polym., 9, p. 289
  • Serre, B., Worsfold, D.J., The effect of radiation on comb block copolymers (1987) Polym., 28, p. 881
  • Davenas, J., Ion beam modification of organic materials (1993) Sol. State Phen., 30-31, p. 317
  • Charlesby, A., (1993) The Effects of Ionising Radiation on Polymers in Irradiation Effects on Polymers, p. 39. , eds D.W. Clegg & A.A. Collyer. Elsevier Appl. Sci, London
  • Bueche, F., (1962) Physical Properties of Polymer, p. 114. , Interscience Pu, NY
  • Ferry, J.D., (1980) Viscoelastic Properties of Polymers, p. 227. , John Wiley & Sons, NY, 3rd edn
  • Aharoni, S.M., Correlations between chain parameters and the plateau modulus of polymers (1986) Macromol., 19, pp. 426-434
  • Haldon, R.A., Simha, R., Multiple transitions in polyalkyl methacrylates (1968) J. Appl. Phys., 39, p. 1890

Citas:

---------- APA ----------
Marzocca, A.J., Goyanes, S.N., Iglesias, M.M. & Villar, J.E. (1996) . Thermal expansion and glass transition of polymethylmethacrylate after exposure to 60Co gamma irradiation. Polymer Testing, 15(2), 179-187.
http://dx.doi.org/10.1016/0142-9418(95)00030-5
---------- CHICAGO ----------
Marzocca, A.J., Goyanes, S.N., Iglesias, M.M., Villar, J.E. "Thermal expansion and glass transition of polymethylmethacrylate after exposure to 60Co gamma irradiation" . Polymer Testing 15, no. 2 (1996) : 179-187.
http://dx.doi.org/10.1016/0142-9418(95)00030-5
---------- MLA ----------
Marzocca, A.J., Goyanes, S.N., Iglesias, M.M., Villar, J.E. "Thermal expansion and glass transition of polymethylmethacrylate after exposure to 60Co gamma irradiation" . Polymer Testing, vol. 15, no. 2, 1996, pp. 179-187.
http://dx.doi.org/10.1016/0142-9418(95)00030-5
---------- VANCOUVER ----------
Marzocca, A.J., Goyanes, S.N., Iglesias, M.M., Villar, J.E. Thermal expansion and glass transition of polymethylmethacrylate after exposure to 60Co gamma irradiation. Polym Test. 1996;15(2):179-187.
http://dx.doi.org/10.1016/0142-9418(95)00030-5