Hi Vinay,

You can measure the melt Temperature (Tm) together with the glass Temperature (Tg) as well as the G'/E' G"/E" and Tang (delta) of polymers with a Dynamic Mechanical Analysis (DMA) and Differential Scanning Calorimeter (DSC). The measurement of these parameters should tell you pretty much everything about the rheological properties. DMA more accurate measurements but is more expensive.

I have done tests longtime ago as a part of my Masters thesis but the principal is the same.

Below is an article I have found that described how these measurements are done as well as the explanations of the results. You may also take a look at the references the publishers have cited.

Ignace

Pharmaceutics. 2010 Jun; 2(2): 78–90.

Published online 2010 Mar 24. doi: 10.3390/pharmaceutics2020078

PMCID: PMC3986708

PMID: 27721344

Assessment of Thermal Transitions by Dynamic Mechanical Analysis (DMA) Using a Novel Disposable Powder Holder

Mohamad G. Abiad,1,† Osvaldo H. Campanella,1 and M. Teresa Carvajal2,*

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Abstract

Foods and pharmaceuticals materials are exposed to various environmental conditions during processing and while in storage; therefore, stability and quality are key attributes of concern. The properties of foods and pharmaceutical materials that define their quality are affected by conditions such as temperature, humidity and time. Glass transition is considered a key material property to understand how these external conditions affect the stability and quality of foods and pharmaceuticals. Thus, investigating the thermo-mechanical properties of these materials as well as characterizing the glass transition temperature have a great interest not only in the food industry, but also extend to the pharmaceutical and polymer industries. The aim of this study was to design and test a new disposable powder holder that allows the use of a dynamic mechanical analysis (DMA) instrument to test and characterize loose powder samples. The disposable aluminum powder holder was designed and constructed to be used in the single cantilever configuration on a TA Instruments RSA III DMA. Three different powder samples – Felodipine, polyethylene-oxide (MW 900 kDa) and HPMC (E4M) – were used for validation. The use of this powder holder allows the detection of different thermal changes of powder samples without compacting and when large sample size is necessary for detection and/or interpretations