INVESTIGADORES
TOMBA juan pablo
artículos
Título:
Interphase Evolution in Polymer Films by Confocal Raman Microspectroscopy
Autor/es:
J. PABLO TOMBA, JOSE M. CARELLA, JOSE M. PASTOR
Revista:
APPLIED SPECTROSCOPY
Referencias:
Año: 2006 vol. 60 p. 115 - 121
ISSN:
0003-7028
Resumen:
Liquid-glassy polymer
diffusion is an important topic in polymer physics, with several mechanistic
aspects that still remain unclear. Here we describe the use of confocal Raman
microspectroscopy to study directly several features of interphase evolution in
a system of this type. The interphase studied was generated by contact between
liquid-polystyrene (PS) and glassy-polyphenylene oxide (PPO). Interphase
evolution on thin films made from these polymers was followed by depth
profiling in combination with immersion optics. We also applied regularized
deconvolution to improve the spatial resolution of the measurements. With the
help of these techniques, we examined interphase PPO concentration profiles and
kinetics of interphase evolution in the range 120-180 oC, well below
the glass transition temperature of the PPO-based films (185 oC).
Overall, the experiment captures the most important features needed to discern
the mechanistic factors that control this process. In this sense, confocal
Raman microspectroscopy emerges as one of the best experimental techniques for
the study of diffusion kinetics in this type of systems.