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