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