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Polímeros

versão impressa ISSN 0104-1428versão On-line ISSN 1678-5169

Resumo

PLIVELIC, Tomás S.; CASSU, Silvana N.; GONCALVES, Maria do Carmo  e  TORRIANI, Iris L.. Simultaneous and time resolved X-ray scattering and differential Scanning calorimetry experiments (SAXS/WAXD/DSC) using synchrotron radiation. Polímeros [online]. 2005, vol.15, n.3, pp.199-206. ISSN 1678-5169.  https://doi.org/10.1590/S0104-14282005000300010.

New instrumentation designed to perform simultaneous time-resolved X-ray scattering experiments at small and wide angles (SAXS/WAXD) as well as differential scanning calorimetry (DSC) has recently been installed at the SAXS beamline of the Laboratório Nacional de Luz Síncrotron. The DSC device proved to be comparable with conventional equipment, allowing temperature variation with rates of up to 60 °C/min with precision of 0.1 °C. The use of a synchrotron radiation source and position sensitive X-ray detectors allows data collection in real time with 30 s resolution. The application of this experimental set-up in the isothermal crystallization and fusion of polymeric materials is given as an example. We present results of experiments with polycaprolactone (PCL) and its blends with chlorinated polyethylene (PCL/PECl), in which the simultaneous appearance of a crystalline structure and lamellar formation can be observed and the rate of process change for different compositions and thermal treatments can be determined. As a concluding remark, we mention that the SAXS/WAXD/DSC simultaneous experiments can also be performed with great advantage in the study of colloids and gel formation, as well as phase transitions in a variety of samples.

Palavras-chave : SAXS; DSC; isothermal crystallization; synchrotron.

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