Tacticity.

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Presentation transcript:

Tacticity

Semicrystalline polymer

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

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

Tacticity determined conformation Atactic polypropylene Isotactic polypropylene Atactic polystyrene Syndiotactic polystyrene

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

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

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

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

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

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

Differential scanning calorimetry