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82 Cards in this Set
- Front
- Back
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Glass Transition Temperature Increases with the presence of:
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Bulky pendant groups
Stiffening groups Chain symmetry Polar groups Cross-liking |
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Glass Transition Temperature decreases with presence of:
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Additives like plastisizers
Flexible main chain groups Nonpolar groups Dissymmetry |
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Solubility is favored by:
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Longer chain lengths
Low interchain forces Disorder and dissymmetry Compatible solvent |
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Crystallinity is favored by:
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High interchain forces
Regular structure:high symmetry Decrease in volume Increase in stress Slow cooling from melt Homogeneous chain length |
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Ways to increase crystallinity
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list
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Ways to increase cross-linking
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list
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Ways to increase molecular weight
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list
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Ways to increase molecular weight distribution
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list
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Ways to add polar backbone units
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list
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Ways to add backbone stiffening units
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list
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Characterization and properties of amorphous polymers
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list
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Characterization and properties of crystalline polymers
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list
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Ways to add backbone stiffening units
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list
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Characterization and properties of amorphous polymers
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list
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Characterization and properties of crystalline polymers
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list
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Polyethylene
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formula
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Polyamide
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formula
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Polybutadiene
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formula
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Poly(butyl mehacrylate)
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formula
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Poly(butylene terephthalate)
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formula
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Polycaprolactone
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formula
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Polycarbonate
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formula and reaction
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Polyester
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formula and reaction
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Polyether
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formula and reaction
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Poly(ethylene glycol)
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formula and reaction
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Poly(ethylene oxide)
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formula and reaction
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Poly(ethylene oxide)
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formula and reaction
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Poly(ethylene terephthalate)
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formula and reaction
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Polyglactin
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formula and reaction
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Polyglycolic acid
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formula and reaction
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Polyimide
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formula and reaction
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Polyisobutylene
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formula and reaction
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Polyisoprene
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formula and reaction
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Polymers
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see definitions
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Homopolymer
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A-A-A-A
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Random copolymer
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A-B-B-A-B-A-B-A-A-B
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Alternating Copolymer
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A-B-A-B-A-B
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Block Copolymer
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A-A-A-A-B-B-B-B
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Graft Copolymer
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A-A-A-A-A-A-A-A
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Degree of polymerization
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define
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Number of repeating units
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n
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Average degree of polymerization
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define
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Linear polymer
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diagram
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branched polymer
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diagram
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network polymer
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diagram
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Star polymer
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diagram
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comb polymer
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diagram
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ladder polymer
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diagram
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semi-ladder polymer
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diagram
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polyrotaxane, poly catenate, dendirmer
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see suppl. 2-3
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Step-growth polymerization
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see definition
Most are condensation reactions |
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Chain-growth polymerization
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see definition
Most are addition reactions |
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Chain reaction polymerization - 2 steps
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Initiation
Propagation |
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Compare/Contrast Step/Chain Reaction for:
Growth DP Monomer consumption Initiator need Termination step Polymerization rate |
add table
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Describe the synthesis of PEEUU
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See figure
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Describe PEUU immobilized with RGDS
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see figure
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What do we mean by high molecular weight?
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define
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Where does low molecular weight end and high begin?
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list
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Number average molecular weight?
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List formula
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Weight average molecular weight
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list formula
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Methods of determining end groups - related to MW measurement
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List from slide - take 2 into account,
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Points to be kept in mind for end-group analysis
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List from slide
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MALDI Mass spectroscopy
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lsit from slide
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Viscometry
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list from slide
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Gel permeation chromatograph
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list form slide
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Explain the following GPC plot
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from slides
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Explain control of MW in PLLA synthesis
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from slides
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Amorphous
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A physical state characterized by almost complete lack of order among the molecules
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Crystalline
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The situation where polymer molecules are oriented, or aligned, in a regular array analogue to a degree to crystal lattice packing in a nonpolymeric solid
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MW and intermolecular forces
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Dipole-dipole interaction (including hydrogen bonding)
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Induction forces (induced dipole)
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details
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Dispersion or London forces or van deer Waal's focus between non polar molecules
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list
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Ionic bonding and ion-dips interaction between polymers containing ionic focus
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list
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Glass transition temperature
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see slide
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What determines the glass transition temperature?
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Chemical structure, method of measurement, molecular weight
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Explain relationship of Tg to polymer structure of various vinyl end groups.
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see table 3.1
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Explain relationship of Tg to polymer structure of various non-vinyl end groups.
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see table 3.2
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Define structure related to crystalline foam
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list
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How is crystallinity induced?
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list
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How does crystallinity affect properties
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list
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What is stereo regularity and why is it not a prerequisite to crystallinity
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list
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Describe how Tg and Tm are affected by structure
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list from table 3.5
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