thermoset polymers Flashcards
(25 cards)
What are thermoset polymers?
Thermoset polymers are a class of polymers that harden permanently when cured, typically through a chemical reaction.
True or False: Thermoset polymers can be remelted and reshaped after curing.
False
What is the primary difference between thermoset and thermoplastic polymers?
Thermoset polymers cannot be remelted after curing, while thermoplastic polymers can be remelted and reshaped.
Name a common example of a thermoset polymer.
Epoxy resin
Fill in the blank: Thermoset polymers are often used in applications requiring __________ and thermal stability.
strength
Which of the following is NOT a thermoset polymer? A) Phenolic resin B) Polyethylene C) Polyester resin
B) Polyethylene
What process is commonly used to cure thermoset polymers?
Chemical cross-linking
True or False: Thermoset polymers have good chemical resistance.
True
What is a characteristic property of thermoset polymers?
They maintain their shape and strength at elevated temperatures.
Name two applications where thermoset polymers are commonly used.
Electrical insulators and automotive parts
Fill in the blank: Thermoset polymers are produced by a process called __________.
polymerization
What happens to thermoset polymers when exposed to high temperatures?
They do not melt; instead, they may degrade or char.
What is the role of curing agents in thermoset polymers?
Curing agents initiate the chemical reaction that hardens the polymer.
True or False: Thermoset polymers are typically more brittle than thermoplastics.
True
What type of bond is primarily responsible for the strength of thermoset polymers?
Cross-linking bonds
Which thermoset polymer is commonly used for coatings and adhesives?
Epoxy resin
Name a thermoset polymer that is often used in high-temperature applications.
Polyimide
Fill in the blank: Thermoset polymers are often reinforced with __________ to improve their mechanical properties.
fibers
What is the significance of the curing temperature in the production of thermoset polymers?
It affects the rate of the curing reaction and the final properties of the polymer.
True or False: Thermoset polymers are recyclable.
False
What is one advantage of using thermoset polymers over thermoplastics?
Higher thermal stability and resistance to deformation.
What type of applications typically require the use of thermoset polymers?
Applications that require durability and resistance to heat and chemicals.
Fill in the blank: The process of __________ involves heating thermoset materials to initiate curing.
thermosetting
Which thermoset polymer is known for its electrical insulating properties?
Phenolic resin
