A) A single atom B) A large molecule composed of repeating structural units C) A small inorganic molecule D) A type of metal
A) Ring-opening polymerization B) Addition polymerization C) Condensation polymerization D) Decomposition polymerization
A) The temperature at which the polymer decomposes B) The temperature at which the polymer transitions from a glassy to a rubbery state C) The temperature at which the polymer melts D) The temperature at which the polymer crystallizes
A) To reduce polymer chain length B) To increase mechanical strength and stability C) To decrease polymer density D) To enhance polymer solubility
A) Increased molecular weight decreases viscosity B) Increased molecular weight leads to higher viscosity C) Increased molecular weight leads to lower elasticity D) Molecular weight has no effect on viscosity
A) To determine polymer degradation kinetics B) To predict the mechanical properties of polymers C) To explain the thermodynamics of polymer solutions and blends D) To model polymer chain conformation
A) To promote the formation of small crystalline regions in a polymer B) To increase the glass transition temperature C) To enhance polymer solubility D) To inhibit polymer chain flexibility
A) To reduce polymer flexibility B) To break down polymer chains C) To decrease polymer durability D) To enhance or modify the properties of polymers
A) A polymer with only one repeating unit B) A polymer with a high degree of crystallinity C) A polymer composed of two or more different monomers D) A single monomer molecule
A) To promote polymer crystallization B) To decrease polymer solubility C) To induce polymer degradation D) To increase mechanical strength and prevent slippage of polymer chains
A) The glassy state promotes polymer flexibility B) The glassy state is for amorphous polymers only C) The glassy state does not affect polymer properties D) In the glassy state, the polymer is hard and brittle
A) Flory B) I. M. Lifshitz C) Pierre-Gilles de Gennes D) Doi and Edwards
A) Directed walk B) Brownian motion C) Self-avoiding random walk D) Simple random walk
A) √N. B) N/b. C) 0. D) bN.
A) ⟨R ⋅ R⟩ = 3Nb² B) ⟨R ⋅ R⟩ = Nb C) ⟨R ⋅ R⟩ = b³ D) ⟨R ⋅ R⟩ = N²b²
A) Theta solvent B) Bad solvent C) Good solvent D) None of these
A) x_rms = N/b. B) x_rms = b√N. C) x_rms = bN. D) x_rms = √bN.
A) Thermodynamics B) Condensed matter physics C) Polymer chemistry D) Statistical physics
A) 1/2 B) 3/5 C) 1/3 D) 1/4
A) Behaves like a solid sphere B) Becomes an ideal chain C) Forms a fractal object D) Expands significantly
A) ⟨ri ⋅ rj⟩ = b²δij B) ⟨ri ⋅ rj⟩ = Nδij C) ⟨ri ⋅ rj⟩ = R² D) ⟨ri ⋅ rj⟩ = 3b²δij
A) Hindered rotation model B) Ideal chain models C) Worm-like chain model D) Real chain models
A) S(R) = Ω(R)/kB B) S(R) = kB ln(Ω(R)) C) S(R) = kBΩ(R) D) S(R) = ln(kBΩ(R))
A) Exactly 25 nm. B) About 50 nm. C) Less than 10 nm. D) More than 100 nm.
A) Ω(R) = cP(R) B) Ω(R) = R/P(R) C) Ω(R) = P(R)/c D) Ω(R) = cR
A) Gaussian distribution B) Uniform distribution C) Exponential distribution D) Binomial distribution
A) Good solvent B) None of these C) Bad solvent D) Theta solvent
A) Fixed bond angles due to chemical bonding. B) A Boltzmann factor based on potential energy. C) Positions of minima in rotational potential energy. D) Persistence length.
A) ΔF = TΔS(R) B) ΔF = S(R)/T C) ΔF = kBΔS(R) D) ΔF = -TΔS(R)
A) Worm-like chain model B) Freely-jointed chain model C) Finite extensible nonlinear elastic model D) Rotational isomeric state model
A) Self-avoiding random walk B) Simple random walk C) Directed walk D) Brownian motion
A) Rotational isomeric state model B) Worm-like chain model C) Hindered rotation model D) Freely-rotating chain |