Polymers Flashcards
What is a polymer?
A polymer is a large molecule composed of many repeated subunits called monomers.
True or False: All polymers are synthetic.
False: Polymers can be natural (like proteins and cellulose) or synthetic (like nylon and polyester).
What are the two main types of polymers?
The two main types of polymers are addition polymers and condensation polymers.
Fill in the blank: Polymers are formed through a process called __________.
polymerization.
What is the difference between thermoplastics and thermosetting plastics?
Thermoplastics can be melted and reshaped multiple times, while thermosetting plastics can only be shaped once and cannot be remelted.
Which of the following is an example of a natural polymer? A) Nylon B) Cellulose C) PVC
B) Cellulose.
What is the role of plasticizers in polymers?
Plasticizers are added to polymers to increase their flexibility and workability.
True or False: Polymers have high tensile strength and low elasticity.
False: Many polymers have high elasticity and can stretch without breaking.
What is the main characteristic of elastomers?
Elastomers are polymers that exhibit rubber-like elasticity.
Fill in the blank: The process of __________ involves heating a polymer to its melting point to reshape it.
extrusion.
What type of polymer is polyethylene?
Polyethylene is an addition polymer.
What does the term ‘copolymer’ refer to?
A copolymer is a polymer made from two or more different types of monomers.
Which of the following polymers is known for its high resistance to heat? A) PVC B) PTFE C) Polypropylene
B) PTFE.
What is the significance of the glass transition temperature (Tg) in polymers?
The glass transition temperature (Tg) is the temperature at which a polymer transitions from a hard and brittle state to a more flexible state.
True or False: All polymers are biodegradable.
False: Many synthetic polymers are not biodegradable.
What is the primary use of polystyrene?
Polystyrene is primarily used for packaging and insulation.
Fill in the blank: __________ is a common method for recycling thermoplastics.
Re-melting.
What are the main applications of acrylic polymers?
Acrylic polymers are used in paints, adhesives, and as transparent plastic sheets.
What is the chemical structure of a polymer often represented as?
A polymer’s chemical structure is often represented as a repeating unit of its monomers.
True or False: Polypropylene is more resistant to chemical solvents than polyethylene.
True.
What is the role of fillers in polymer production?
Fillers are added to polymers to reduce costs and improve properties like strength and durability.
What does ‘molecular weight’ refer to in the context of polymers?
Molecular weight refers to the mass of a polymer molecule, which affects its properties and performance.
What is the effect of cross-linking in polymers?
Cross-linking increases the strength and thermal stability of polymers.
Fill in the blank: __________ polymers are often used in applications requiring high durability and resistance to deformation.
Thermosetting.
What is an example of a biodegradable polymer?
Polylactic acid (PLA) is an example of a biodegradable polymer.
What is the primary component of rubber?
The primary component of rubber is polyisoprene.
True or False: Polyethylene terephthalate (PET) is commonly used for making beverage bottles.
True.
What is the purpose of additives in polymer formulations?
Additives improve the properties and processing of polymers, such as enhancing UV resistance or color.
What is a common method for forming polymer products?
Common methods include injection molding, extrusion, and blow molding.
Fill in the blank: The __________ structure of a polymer can greatly influence its mechanical properties.
molecular.
