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