1. Tacticity

2. Semicrystalline polymer

3. Size and location of side groups
Polyethylene
Polypropylene
Poly (methyl methacrylate)
Polystyrene

4. Macro molecular conformations
(1)
(2)
(3)

5. Tacticity determined conformation
Atactic polypropylene
Isotactic polypropylene
Atactic polystyrene
Syndiotactic polystyrene

6. Fringed micelle model
(1)
(2)
Chain folding models
(1)
(2)
(3)

7. Properties of bulk semicrystalline polymer
Experimental results indicates crystallite behave like defect resulting in higher values of (1) (2) (3) (4) (5)

8. Thermal effects on crystallinity
Tm:
Tg:
(1)
(2)
(3)
(4)

9. Six factors affecting Tg
(1) nf: (2) Secondary forces: (3) Internal mobility: ns n

10. Six factors affecting Tg
(4) Chain/backbone Stiffness: (5) Chain length: (6) cross-linking:
Poly (diallyl phthalate)

11. Phase transition temperatures, Tg & Tm
First order transition
Specific volume, n (cm3/g)
Second order transition Tg Tm
T(°C)

12. Differential scanning calorimetry