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