Polymer, A substance whose molecules have high molar masses and are composed of a large number of repeating units, Thermoplastic, A material softening when exposed to heat and then returning to its original condition when cooled., Thermoset, A cured thermosetting polymer, Thermosetting polymer, A prepolymer in a soft solid or viscous state that changes irreversibly into an infusible, insoluble polymer network by curing., Cross-linking, Chemical bonding between different chains of atoms in a polymer, Elastomer, A rubbery polymer that can be stretched easily to several times their unstretched length and which rapidly return to their original dimensions when the applied stress is released, Glass transition, The gradual and reversible transition in amorphous materials (or in amorphous regions within semicrystalline materials) from a hard and relatively brittle "glassy" state into a viscous or rubbery state as the temperature is increased., Degree of crystallinity, The degree of structural order of a solid, Step-Growth Polymerization, A type of polymerization mechanism in which bi-functional or multifunctional monomers react to form first dimers, then trimers, longer oligomers and eventually long chain polymers., Chain Polymerization, A polymerization technique where unsaturated monomer molecules add onto the active site on a growing polymer chain one at a time.

Polymers

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