Polymeric films and film coating

Plasticisation of a polymer results in a lowering of the glass transition temperature, with a broadening of the range over which the transition occurs [161]. The determination of the thermal properties utilises the full gambit of thermal analytic techniques. 

HPMC by PEG which has been followed by both DSC [ 162] and torsional braid analysis (TBA) [163]. 

The separation into two phases of aqueous mixed polymers can be detected by DMA and DSC. Sakellariou et al [167] showed that these techniques proved separation in PVA/HPMC blends where each phase excluded the other polymer. The HPMC rich phase was amorphous with a constant 7],. The PVA phase showed a limited degree of crystallinity but a constant for the amorphous part. 

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