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Modern Materials

Modern Materials. BLB Chapter 12. 12.1 Liquid Crystals. Solid → liquid crystal → liquid Liquid crystals – exhibit properties of both liquids and crystalline solids Ordered arrangement Viscous liquid, non-solid Types of liquid crystal phases:. Examples of Molecules.

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Modern Materials

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  1. Modern Materials BLB Chapter 12

  2. 12.1 Liquid Crystals • Solid → liquid crystal → liquid • Liquid crystals – exhibit properties of both liquids and crystalline solids • Ordered arrangement • Viscous liquid, non-solid • Types of liquid crystal phases:

  3. Examples of Molecules • Long in comparison to width • Flat benzene rings aid in stacking • End polar groups promote allignment

  4. Applications of Liquid Crystals • Temperature monitors • LCDs

  5. 12.2 Polymers • “many parts” • Large, high molecular weight molecular compounds • Formed by joining monomers together through polymerization • Examples: plastic, DNA, proteins, starch, rubber

  6. Types of Polymerization • Addition – monomers are added together forming bonds between them

  7. Condensation Polymerization – monomers are joined with the elimination of a small molecule such as water Production of proteins: (See p. 1013)

  8. More about Polymers • Types of plastic • Thermoplastic • Thermoset • Elastomer • Crystallinity • Branching • Cross-linking

  9. Natural rubber Vulcanized rubber (Goodyear, 1839)

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