Lecture 11 - ENGR 4250 Advanced Materials Engineering...

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ENGR 4250 – Advanced Materials Engineering Lecture 11 Applications & Processing of Polymers Chapters 14 & 15 Dr. A. Keshavarz - ENGR 4250U
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Polymers What is a polymer? Poly mer many repeat unit Adapted from Fig. 14.2, Callister 7e. C C C C C C H H H H H H H H H H H H Cl Cl Cl C C C C C C H H H H H H H H H H H H H H C C C C C C CH 3 H H CH 3 CH 3 H repeat unit repeat unit repeat unit Dr. A. Keshavarz - ENGR 4250U
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2 Poly mer = many mers Covalent chain configurations and strength: Direction of increasing strength Adapted from Fig. 14.2, Callister 6e. Adapted from Fig. 14.7, POLYMER MICROSTRUCTURE Dr. A. Keshavarz - ENGR 4250U
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Ancient Polymer History • Originally natural polymers were used – Wood – Rubber – Cotton – Wool – Leather – Silk Dr. A. Keshavarz - ENGR 4250U
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Hydrocarbons Dr. A. Keshavarz - ENGR 4250U
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Phenyl Group Dr. A. Keshavarz - ENGR 4250U
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Polymers Adapted from Fig. 14.1, Callister 7e. Note: polyethylene is just a long HC - paraffin is short polyethylene Dr. A. Keshavarz - ENGR 4250U
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Bulk or Commodity Polymers Dr. A. Keshavarz - ENGR 4250U
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Dr. A. Keshavarz - ENGR 4250U
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Dr. A. Keshavarz - ENGR 4250U
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MOLECULAR WEIGHT molecules of # total polymer of wt total = n M i i w i i n M w M M x M Σ = Σ = M w is more sensitive to higher molecular weights Molecular weight , M i : Mass of a mole of chains. Lower M higher M Adapted from Fig. 14.4, Callister 7e. Dr. A. Keshavarz - ENGR 4250U
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Molecular Weight Very long chains Not all chains are same length Average molecular weight i i n M x M = i i w M w M = Dr. A. Keshavarz - ENGR 4250U
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Degree of Polymerization, n n = number of repeat units per chain C C C C C C C C H H H H H H H H H H H H H H H H H C C C C H H H H H H H H H ( ) n i = 6 w i i w n i i n m m M n w n m M n x n = = = = = unit repeat of weight molecular average where Dr. A. Keshavarz - ENGR 4250U
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Properties and Molecular Weight M 100 g/mol gas or liquid M 1000 g/mol Wax like M 10000 g/mol Solid M STRENGTH Dr. A. Keshavarz - ENGR 4250U
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Atomic bond configurations Polymers – Molecular Shape Conformation – Molecular orientation can be changed by rotation around the bonds note: no bond breaking needed Dr. A. Keshavarz - ENGR 4250U
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End to End Distance, r Adapted from Fig. 14.6, Callister 7e. Dr. A. Keshavarz - ENGR 4250U
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Covalent chain configurations and strength: Direction of increasing strength Adapted from Fig. 14.7, Callister 7e. Molecular Structures Branched Cross-Linked Network Linear secondary bonding Dr. A. Keshavarz - ENGR 4250U
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Relative Usage of Plastics Dr. A. Keshavarz - ENGR 4250U
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Thermosets Vulcanization of rubber Dr. A. Keshavarz - ENGR 4250U
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Thermosets Unsaturated Polyesters Polyurethanes Epoxies Phenolics Dr. A. Keshavarz - ENGR 4250U
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Thermoplastics Polyethylene (PE) – Packaging, electrical insulation, milk and water bottles, packaging film Polypropylene (PP) – Carpet fibers, automotive body parts & bumpers, microwave containers Polyvinyl chloride (PVC) – Sheathing for electrical cables, floors, sidings, automobile instrument panels Polystyrene (PS) – Insulations and packaging, foamed cups, etc.
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Lecture 11 - ENGR 4250 Advanced Materials Engineering...

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