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29 Cards in this Set
- Front
- Back
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Covalent Bond |
Type of bond between hydrocarbon molecules |
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Wallace Carothers, Dupont Company |
Produced nylon |
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Leo Bakelite |
Oldest recorded synthetic plastic, excellent choice as an electrical insulator. |
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Kevlar |
A high strength material that can withstand temperatures up to 300°C and is used as bullet proof vests and fire proof garments. |
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Tetrahedral |
Arrangement of C-H |
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Uber Polymerization |
The paper that Staudunger published in 1920 |
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Charles Goodyear |
Discovers vulcanization in 1839 |
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Saturated Hydrocarbon |
Have relatively low melting point and boiling points |
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Isomers |
Two compounds having same chemical formula but have different structures |
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1. Initiation 2. Propagation 3. Termination |
Steps of addition polymerization |
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Thermoplastic |
A polymer that liquefies upon heating and freezes to glassy state when cooled. |
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Polyethylene |
A type if polymer whose chains is associated by weak Van der Waals force |
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Nylon |
A type if polymer whose chains is associated by dipole-dipole interactoons and hydrogen bonding |
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Thermosets |
A type of plastic that decomposes upon heating. |
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Platics Elastomers Fibers |
Polymer types |
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1. PET 2. HDPE 3. PVC 4. LDPE 5. PP 6. PS 7. Other |
Plastic Classification |
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Polyethylene |
Resistant to organic solvents, decreasing agents and electrolytic attack |
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Short shot |
Molten plastic doesnt reach the mold cavity section |
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Flash |
Flowing into unwanted sections of the mold cavity |
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Splay |
Caused by water absorption or aeration |
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Warpage |
Differential cooling rate of the melt |
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Burn marks |
When air and gasses are trapped inside the mold cavity high pressure |
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Void |
The walls solidify ans the plastic melt shrinks toward the wall and sucks a vacuum |
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Bubbles |
Moisture or gas embedded inside the melt |
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Gate blush |
Result of differential material shearing |
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Weld line |
Result of two different flow fronts |
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Jetting |
The fresh plastic does not blend well with the first material |
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Sink marks |
Arises when the surface cools too slow |
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Oxygen index |
Minimum oxygen required to support combustion of a polymer |
