Polymers.

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Presentation transcript:

Polymers

What are Polymers? Long chains of repeating monomers

Natural Polymers Silk/Wool Cellulose/Lignin Starches/Polysaccharides DNA/RNA Rubber Proteins

Synthetic Polymers Plastics Synthetic Fibers (nylon, polyester, etc.) Films Elastomers Adhesives Synthetic rubbers

Properties of Polymers Large molar masses Structure of monomer determines properties of polymer (and what function it may serve) Rubber: liquid at room temperature

Glue Polymer composed of primarily collagen

Borax (Borate ion, BO32-)

Glass-Transition Temperature temperature at which a polymer transitions from crystalline to amorphous elastomers (such as rubber) have relatively low TG and are amorphous under standard conditions

Cross-linking 1839 – Goodyear - vulcanization By covalently connecting polymer chains, “solid-like” properties can be obtained Tensile strength, stiffness, toughness, etc.

Is the polymer crosslinked? Nuclear magnetic resonance Diffusion tests Scanning electron microscope Swell test