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Polymer Parameters

Polymer Parameters. Chemical structure Chemical composition and distribution Sequence length and distribution Molecular weight and distribution Chain isomerism Morphology Topology Additives Cost. Amorphous Morphology. Glass Transition Temperature. - 80 °C - 20 °C 105 °C 290 °C.

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Polymer Parameters

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  1. Polymer Parameters • Chemical structure • Chemical composition and distribution • Sequence length and distribution • Molecular weight and distribution • Chain isomerism • Morphology • Topology • Additives • Cost

  2. Amorphous Morphology Glass Transition Temperature • - 80 °C • - 20 °C • 105 °C • 290 °C

  3. Structure-Property Relationships Boiling Point Formula Weight • 46 g/mol • 46 g/mol Boiling Point Formula Weight • 86 g/mol • 188 g/mol

  4. Structure-Property Relationships Tm (°C) ΔG = ΔH — T ΔS

  5. PE vs PTFE

  6. Structure-Property Relationships Tg (°C) Tm (°C) Tm (°C)

  7. Polymer Parameters • Chemical structure • Chemical composition and distribution • Sequence length and distribution • Molecular weight and distribution • Chain isomerism • Morphology • Topology • Additives • Cost

  8. Topology • Soluble and melt processable • Linear • Branched • Long chain • Short chain

  9. Topology

  10. Topology • Network • Insoluble • Intractable • No flow with heat and pressure • aka • Gel, cured, vulcanizate, thermoset, crosslinked • Examples • Rubber, epoxy glue, etc

  11. Mechanical Properties

  12. Effect of Branching on Melting Transitions of PEs

  13. Polymer Parameters • Chemical structure • Chemical composition and distribution • Sequence length and distribution • Molecular weight and distribution • Chain isomerism • Topology • Morphology • Additives • Cost

  14. Additives • Plasticizers • PVC • Tg ≈ 80 °C • Tg ≈ ? °C w/ 2% DOP • Stabilizers • Processing temperature • Operating temperature • Properties • MW • Brittleness • Discoloration • Cross-linking

  15. Additives • Anti-oxidants • Flame retardants • Colorants • Dyes • Fillers • Carbon black: UV screen, enhance modulus • Fibrous reinforcers: glass, carbon, polymeric, ceramics • Economic performance fillers: Saw dust, dirt, etc! • Blowing agents • Lubricants

  16. Polymer Parameters • Chemical structure • Chemical composition and distribution • Sequence length and distribution • Molecular weight and distribution • Chain isomerism • Topology • Morphology • Additives • Cost

  17. Cost • Application dependent • Feedstock dependence • Raw materials cost • Recycle vs new • GDP independence? • Process improvements • COO • Environmental issues • Catalysts • Automation/sensors

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