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What are the three main types of polymers?
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Key Terms
Term
Definition
What are the three main types of polymers?
Thermoplastics, thermosets, and elastomers.
What is the main difference between thermoplastics and thermosets?
Thermoplastics can be reshaped with heat, while thermosets are rigid and cannot be reshaped once set.
Why are polymers more temperature sensitive than metals?
Polymer properties are influenced by molecular length and shape, making them more sensitive to temperature changes.
What is the primary material used to replace cast iron pipes in the UK?
Polyethylene (PE) pipes.
What is the 'yield before break' condition in materials?
It ensures that a material yields in a ductile manner before fracturing, preventing sudden failure.
What are the advantages of using HDPE over LDPE?
HDPE has higher tensile strength, impact resistance, and puncture resistance compared to LDPE.
Related Flashcard Decks
| Term | Definition |
|---|---|
What are the three main types of polymers? | Thermoplastics, thermosets, and elastomers. |
What is the main difference between thermoplastics and thermosets? | Thermoplastics can be reshaped with heat, while thermosets are rigid and cannot be reshaped once set. |
Why are polymers more temperature sensitive than metals? | Polymer properties are influenced by molecular length and shape, making them more sensitive to temperature changes. |
What is the primary material used to replace cast iron pipes in the UK? | Polyethylene (PE) pipes. |
What is the 'yield before break' condition in materials? | It ensures that a material yields in a ductile manner before fracturing, preventing sudden failure. |
What are the advantages of using HDPE over LDPE? | HDPE has higher tensile strength, impact resistance, and puncture resistance compared to LDPE. |
What is the significance of the Melt Flow Index (MFI) in polymers? | MFI measures the flow properties of polymer melts, indicating processability. |
What are spherulites in polymers? | Spherulites are spherical structures formed by the branching and splaying of lamellae during polymer crystallization. |
What properties make UHMWPE suitable for biomedical implants? | High toughness, abrasion resistance, and low friction make UHMWPE ideal for bearing surfaces in implants. |
What is the main environmental concern with polymers? | Most polymers are oil-derived and have recycling limitations, leading to environmental persistence. |