Small angle neutron scattering measurements of deuterated poly(methyl methacrylate) (d-PMMA) and poly(epichlorohydrin) (PECH) blends were used to elucidate differential scanning calorimetry (d.s.c.) measurements previously obtained on similar blends. Debye-Bueche type scattering from the d-PMMA/PECH blends indicated the presence of two phases with correlation lengths of several hundred /~ngstr6m. These lengths show a rough compositional correlation with the overall breadth of the glass transition temperature (Tg) events found by d.s.c. The original hypothesis that the broad Tg events were indicative of large scale concentration fluctuations in the blend appears to be incorrect; the broad T s events are more likely due to separate phases with differing Tgs within the polymer mixture. This interpretation is consistent with a more detailed d.s.c, investigation presented here
Посилання на статтю:
Re-examination of poly(methyl methacrylate)/poly ( epichlorohydrin ) blends by small angle neutron scattering and differential scanning calorimetry / J. N. Clark* and J. S. Higgins // Polymer. – 1992. – Vol 33. – P. 3137-3144.