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Polymer Synthesis CHEM 421 Polymer Parameters Chemical structure –Chemical composition and distribution –Sequence length and distribution Molecular weight and distribution Chain isomerism Morphology Topology Additives Cost
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Polymer Synthesis CHEM 421 Amorphous Morphology - 80 °C - 20 °C 105 °C 290 °C Glass Transition Temperature
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Polymer Synthesis CHEM 421 Structure-Property Relationships Boiling Point 46 g/mol Formula Weight 86 g/mol 188 g/mol Formula Weight
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Polymer Synthesis CHEM 421 Structure-Property Relationships T m (°C) ΔG = ΔH — T ΔS
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Polymer Synthesis CHEM 421 PE vs PTFE
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Polymer Synthesis CHEM 421 Structure-Property Relationships T g (°C) T m (°C)
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Polymer Synthesis CHEM 421 Polymer Parameters Chemical structure –Chemical composition and distribution –Sequence length and distribution Molecular weight and distribution Chain isomerism Morphology Topology Additives Cost
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Polymer Synthesis CHEM 421 Topology Soluble and melt processable –Linear –Branched »Long chain »Short chain
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Polymer Synthesis CHEM 421 Topology
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Polymer Synthesis CHEM 421 Topology Network –Insoluble –Intractable »No flow with heat and pressure aka –Gel, cured, vulcanizate, thermoset, crosslinked Examples –Rubber, epoxy glue, etc
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Polymer Synthesis CHEM 421 Mechanical Properties
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Polymer Synthesis CHEM 421 Effect of Branching on Melting Transitions of PEs
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Polymer Synthesis CHEM 421 Polymer Parameters Chemical structure –Chemical composition and distribution –Sequence length and distribution Molecular weight and distribution Chain isomerism Topology Morphology Additives Cost
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Polymer Synthesis CHEM 421 Additives Plasticizers –PVC »Tg ≈ 80 °C »Tg ≈ ? °C w/ 2% DOP Stabilizers –Processing temperature –Operating temperature –Properties »MW »Brittleness »Discoloration »Cross-linking
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Polymer Synthesis CHEM 421 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
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Polymer Synthesis CHEM 421 Polymer Parameters Chemical structure –Chemical composition and distribution –Sequence length and distribution Molecular weight and distribution Chain isomerism Topology Morphology Additives Cost
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Polymer Synthesis CHEM 421 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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