JEE Main · ChemistryHard
Which of the following statements regarding the glass transition temperature () of polymers is correct?
- A.Tg is the temperature at which the polymer chains begin to undergo crystalline melting.
- B.Tg is independent of the molecular weight of the polymer.
- C.Tg is the temperature at which the amorphous regions of the polymer transition from a glassy state to a rubbery state.
- D.Tg is always higher than the melting temperature (Tm) of the polymer.
Show correct answer & step-by-step solution
Correct answer: C — Tg is the temperature at which the amorphous regions of the polymer transition from a glassy state to a rubbery state.
Solution
- Below , the polymer chains are frozen in a glassy, rigid state.
- At , the amorphous regions gain enough thermal energy for long-range segmental motion.
- This transition is distinct from crystalline melting, which involves the breakdown of ordered lattice structures.
- The is generally lower than the melting temperature .
- Hence the answer is (C).
Attempt this question & track your score
Sign up free to answer, get instant scoring, and let SolveGini track which Chemistry topics you need to revise.
Attempt & Track Free →More Polymers practice questions
- Which polymer is used in the manufacture of non-stick cookware?
- Nylon-6,6 is obtained by the condensation polymerization of
- The monomer of natural rubber is
- Which of the following is a biodegradable polymer?
- Which of the following is a natural polymer?
- Which monomer is used to prepare the polymer known as Orlon?
- The monomer units of Bakelite are:
- Which of the following is an example of a synthetic rubber?
- Which of the following polymers is a polyamide?
- Which of the following statements regarding the synthesis and properties of Nylon-6,6 is correct?
- What is the repeating unit of Teflon?
- Which polymer is biodegradable and used in orthopedic devices?