Polymers I SchoolWorld an Edline Solution我shoolworld艾里尼溶液的聚合物.pptVIP

Epoxy Reaction: Primary Amine If an Amine is on both ends you get a “crosslink” Thermoset Polyester Reaction Thermoset Frequent Cross-links Create 3-D Network Amorphous Polymer – Lightly Crosslinked Semicrystalline Thermoplastic Levels of Polymer Architecture Monomer Type Molecule Length – molecular weight Mixture of Monomers – copolymers Monomer Arrangement – Isomers Bond/Network Structure Molecular Conformation Amorphous Example: Polycarbonate Crystalline Example: Polyethylene Crystals Chains assume folded chain conformation These collect into lamellar crystallite Two crystalline morphologies (collections of lamellar crystalites) Spherulite (no shear) Row Nucleated (shear ) Shish-kebab Levels of Polymer Architecture Monomer Type Molecule Length – molecular weight Mixture of Monomers – copolymers Monomer Arrangement – Isomers Bond/Network Structure Molecular Conformation Blends/Alloys Polymer Blends Mixture of compatible polymers No primary bonds Intermediate properties May be phase separation Levels of Polymer Architecture Monomer Type Molecule Length – molecular weight Mixture of Monomers – copolymers Monomer Arrangement – Isomers Bond/Network Structure Molecular Conformation Blends/Alloys Additives Polymer Categories: Network Thermoset vs Thermoplastic Network vs Linear Fixed vs Reshapeable Polymer Categories: Price Commodity $1/pound Engineering $1.5-$5/pound Specialty $5/pound Polymer Categories: Application Plastics Adhesives Films Fibers Elastomers Self-Test Draw the monomer structure of polyethylene. What crystalline morphology forms under shear? Which type of polymer cannot be reshaped by heat and pressure? Polymer I Polymerization, Polymer Structure, Morphology Objectives Explain the basic steps in polymerization. Objectives Explain the basic steps in polymerization. Explain the epoxy/amine reaction mechanism. Objectives Explain the basic steps in polymerization. Explain the epoxy/amine reaction mechanism.