Polymers Flashcards
(30 cards)
What is addition polymerization?
Addition polymerization is a process where unsaturated monomers react to form a polymer without the loss of any small molecules.
Which type of monomers are typically used in addition polymerization?
Unsaturated monomers, such as alkenes and alkynes, are typically used.
True or False: Addition polymerization results in the formation of by-products.
False: Addition polymerization does not produce by-products.
What is the general reaction equation for the polymerization of ethylene?
n C2H4 → (C2H4)n
What initiates the addition polymerization process?
An initiator, such as a radical or catalyst, is needed to start the process.
Fill in the blank: The addition polymerization of styrene produces ________.
polystyrene
Name one condition necessary for addition polymerization to occur.
Heat or light can be used to initiate the reaction.
What role do free radicals play in addition polymerization?
Free radicals act as initiators that start the chain reaction of polymerization.
Which polymer is formed from the addition polymerization of propylene?
Polypropylene
Multiple Choice: Which of the following is NOT a characteristic of addition polymerization? A) No by-products B) Involves condensation C) Uses unsaturated monomers D) Requires initiators
B) Involves condensation
What is the term for the repeating units in the polymer formed by addition polymerization?
Monomer units
True or False: Addition polymerization can occur at room temperature.
True: Addition polymerization can occur at room temperature if the right conditions and initiators are present.
What is the equation for the addition polymerization of vinyl chloride?
n C2H3Cl → (C2H3Cl)n
What type of polymerization involves the formation of cyclic intermediates?
Ring-opening polymerization is a type of addition polymerization that involves cyclic intermediates.
Fill in the blank: The polymerization of tetrafluoroethylene produces ________.
polytetrafluoroethylene
What is the significance of the degree of polymerization?
The degree of polymerization indicates the number of monomer units in a polymer chain.
Multiple Choice: Which of the following is a common initiator for addition polymerization? A) Water B) Benzoyl peroxide C) Ammonia D) Sodium chloride
B) Benzoyl peroxide
True or False: Addition polymerization can only occur in a solution.
False: Addition polymerization can occur in various media including solution, bulk, and gas phase.
What is the primary characteristic of the chain-growth mechanism in addition polymerization?
The primary characteristic is that the growth of the polymer chain occurs by the successive addition of monomer units.
What is the result of terminating a growing polymer chain?
The termination of a growing polymer chain results in the formation of a stable polymer.
Which method of addition polymerization involves the use of light?
Photopolymerization
Fill in the blank: The polymerization of isoprene leads to the formation of ________.
natural rubber
What is the role of chain transfer agents in addition polymerization?
Chain transfer agents help control the molecular weight of the polymer by transferring the growing chain to another molecule.
What is one environmental concern related to addition polymerization?
The production of non-biodegradable plastics is a significant environmental concern.
