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structure_propertybehavior

structure_propertybehavior - Polymeric Materials Polymeric...

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Polymeric Materials Polymeric Materials Structure-Property Behavior Structure-Property Behavior Dr. Anthony Brennan Plastics Processing
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Agenda Agenda Overview of Plastics General Classifications Structure/Property Relationships Plastics Processing Plastics Industry Experimenting with Plastics
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Polymer Structure -Property Polymer Structure -Property Behavior Behavior chain thermodynamics chain dimensions chain environment chain topography mechanical behavior
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Compare MD with TD for PE Film Compare MD with TD for PE Film Slowly draw each Dogbone Observations? Explain in a Physical Sense Explain using Thermodynamics Relate to Processing
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Stress - Strain Response Stress - Strain Response A: Modulus-chain entanglements, bond rotation B: Yielding-chain disentanglement, volume expansion C: Strain Hardening- chain viscous motion, chain alignment D: Failure-chain bond breakage, reduction in molar mass Stress (A.U.) Strain A B C D
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Observations Observations Difference in total elongation Difference in applied stress Necking Whitening Retraction upon failure Exam changes in stress strain response
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Stress - Strain Response Stress - Strain Response A: High frequency ( τ << t), Low temperature (T<<Tg,Tm), high crystallinity B: Decreasing frequency, ( τ ~t) (T~Tg, T<Tm) C: Decreasing frequency ( τ >t), decreasing crystallinity, (T>Tg, T<Tm) D: Low frequency ( τ >>t), high temperature (T>>Tg, T~Tm), low crystallinity Stress (A.U.) Strain A B C D
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Chain Energy Chain Energy ( ( Thermodynamics Thermodynamics ) ) H - bonding HEAT COOL COOL G = ∆Η - Τ∆ S
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Balance of Three Energies Balance of Three Energies Intramolecular PE vs Nylon 6 Nylon 6 vs Kevlar Kevlar vs Nomex Intermolecular Nylon vs PE Thermal kT per repeat unit Bond rotation Nylon 6 : 10 to 20 kcal/ mol (Tm: 220°C) Kevlar: >20 kcal/mol Secondary Bonding H-Bonds, Dipole, Ionic, van der Waals 2 to 11 kcal/mol Low energy ~0.6 kcal/mol
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