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Tacticity

Tacticity. Semicrystalline polymer. Size and location of side groups. Polyethylene. Polystyrene. Polypropylene. Poly (methyl methacrylate). Macro molecular conformations. (1) (2) (3). Tacticity determined conformation. Atactic polypropylene Isotactic polypropylene

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Tacticity

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  1. Tacticity

  2. Semicrystallinepolymer

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

  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 semicrystallinepolymer 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

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