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