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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. - PowerPoint PPT Presentation
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Modern MaterialsModern Materials
BLB Chapter 12BLB Chapter 12
12.1 Liquid Crystals12.1 Liquid Crystals Solid Solid → liquid crystal → liquid→ liquid crystal → liquid Liquid crystals – exhibit properties of both liquids Liquid crystals – exhibit properties of both liquids
and crystalline solidsand crystalline solids Ordered arrangementOrdered arrangement Viscous liquid, non-solidViscous liquid, non-solid
Types of liquid crystal phases:Types of liquid crystal phases:
Examples of MoleculesExamples of Molecules
Long in comparison to widthLong in comparison to width Flat benzene rings aid in stackingFlat benzene rings aid in stacking End polar groups promote allignmentEnd polar groups promote allignment
Applications of Liquid CrystalsApplications of Liquid Crystals
Temperature monitorsTemperature monitors LCDsLCDs
12.2 Polymers12.2 Polymers
““many parts”many parts”Large, high molecular weight molecular Large, high molecular weight molecular
compoundscompoundsFormed by joining monomers together Formed by joining monomers together
through polymerizationthrough polymerizationExamples: plastic, DNA, proteins, starch, Examples: plastic, DNA, proteins, starch,
rubberrubber
Types of PolymerizationTypes of Polymerization1.1. Addition – monomers are added together Addition – monomers are added together
forming bonds between themforming bonds between them
2.2. Condensation Polymerization – monomers are Condensation Polymerization – monomers are joined with the elimination of a small molecule joined with the elimination of a small molecule such as watersuch as water
N
H
H H O C
O
+ N
H
C
O
H O H+
Production of proteins: (See p. 1013)
More about PolymersMore about Polymers
Types of plasticTypes of plasticThermoplasticThermoplasticThermosetThermosetElastomerElastomer
CrystallinityCrystallinityBranchingBranchingCross-linkingCross-linking
Natural rubber
Vulcanized rubber(Goodyear, 1839)