Rheological properties glass phase transition

The existence of biphasic (mixture of solid and liquid phase even in molten state) nature makes the rheological properties of LCPs extraordinary. For crystalline polymers, the modulus depends on the degree of crystallinity. The degree of crystallinity for LCPs also change with the variation of frequency as well as temperature (Dae Han and Kim 1993). The amorphous portions go through the glass transition, but the crystalline portirMi remains hard. Thus a composite modulus is found for LCPs. 

Several factors can be identified as being crucial for the foaming of immiscible polymer blends the blend morphology, the phase size of the blend constituents, the interfacial properties between the blend partners, and, last but not least, the properties of the respective blend phases such as the melt-rheological behavior, the glass transition temperature, the gas solubility, as well as the gas diffusion coefficient. Most of these factors also individually influence the melt-rheological behavior of two-phase blends. 

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