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