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Thermal Transition of Polymers

Thermal Transition of Polymers. Kausar Ahmad Kulliyyah of Pharmacy, IIUM http://staff.iiu.edu.my/akausar. Contents. Glass transition temperature Crystalline melting point Factors affecting Tg Factors affecting Tm Thermal methods of polymer analysis. Thermal transitions of polymers .

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Thermal Transition of Polymers

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  1. Thermal Transition of Polymers Kausar Ahmad Kulliyyah of Pharmacy, IIUM http://staff.iiu.edu.my/akausar Physical Pharmacy 2

  2. Contents • Glass transition temperature • Crystalline melting point • Factors affecting Tg • Factors affecting Tm • Thermal methods of polymer analysis Physical Pharmacy 2

  3. Thermal transitions of polymers Physical Pharmacy 2

  4. AMORPHOUS POLYMERS Physical Pharmacy 2

  5. Semicrystalline polymers Physical Pharmacy 2

  6. Factors affecting Tg Physical Pharmacy 2

  7. …cont’…Factors affecting Tg Physical Pharmacy 2

  8. Factors affecting Tm Physical Pharmacy 2

  9. Values of Tg & Tm Physical Pharmacy 2

  10. Thermal analysis of polymers Physical Pharmacy 2

  11. Differential Scanning Calorimetry (DSC) • Polymer and reference samples are heated in such a way that they are kept at the same (increasing) temperature. • When a thermal transition occurs thermal energy is supplied to the polymer or reference. • The energy transferred is equivalent to the energy absorbed or evolved in the transition. Physical Pharmacy 2

  12. DSC Plot • The resulting plot of differential rate of heating Vs temperature can be studied to measure heat capacity, melt enthalpy and transition temperature. Physical Pharmacy 2

  13. Characteristics of a DSC curve Physical Pharmacy 2

  14. Applications of the DSC curve Physical Pharmacy 2

  15. Melting point from DSC curve • Can determine the exact melting point as the temperature at which melting is complete. • The actual melting of the polymer takes place at a range of temperature. • On-set • Mid Physical Pharmacy 2

  16. Thermogravimetric analysis TGA Physical Pharmacy 2

  17. TGA Curve Physical Pharmacy 2

  18. References Aulton, M. E. (1988). Pharmaceutics: The Science of dosage form design. London: Churchill Livingstone. Wise, D. L. (2000). Handbook of Pharmaceutical Controlled Release Technology. New York: Marcel Dekker. Chasin, M & Langer, R (1990). Biodegradable polymers as drug delivery systems. New York: Marcel Dekker. Vyas, S. P & Khar, R. K. (2002). Targeted and controlled drug delivery. New Delhi: CBS. Physical Pharmacy 2

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