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