A) A small inorganic molecule B) A type of metal C) A large molecule composed of repeating structural units D) A single atom
A) Addition polymerization B) Decomposition polymerization C) Condensation polymerization D) Ring-opening 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 decrease polymer density D) To increase mechanical strength and stability
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 determine polymer degradation kinetics B) To explain the thermodynamics of polymer solutions and blends C) To predict the mechanical properties of polymers D) To model polymer chain conformation
A) To inhibit polymer chain flexibility B) To enhance polymer solubility C) To increase the glass transition temperature D) To promote the formation of small crystalline regions in a polymer
A) To break down polymer chains B) To enhance or modify the properties of polymers C) To decrease polymer durability D) To reduce polymer flexibility
A) A polymer with a high degree of crystallinity B) A single monomer molecule C) A polymer composed of two or more different monomers D) A polymer with only one repeating unit
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 is for amorphous polymers only C) In the glassy state, the polymer is hard and brittle D) The glassy state promotes polymer flexibility
A) Flory B) I. M. Lifshitz C) Pierre-Gilles de Gennes 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) √N. D) bN.
A) ⟨R ⋅ R⟩ = 3Nb² B) ⟨R ⋅ R⟩ = Nb C) ⟨R ⋅ R⟩ = b³ D) ⟨R ⋅ R⟩ = N²b²
A) None of these B) Good solvent C) Bad solvent D) Theta solvent
A) x_rms = bN. B) x_rms = b√N. C) x_rms = √bN. D) x_rms = N/b.
A) Polymer chemistry B) Statistical physics C) Condensed matter physics D) Thermodynamics
A) 1/2 B) 1/3 C) 3/5 D) 1/4
A) Behaves like a solid sphere B) Expands significantly C) Forms a fractal object D) Becomes an ideal chain
A) ⟨ri ⋅ rj⟩ = Nδij B) ⟨ri ⋅ rj⟩ = R² C) ⟨ri ⋅ rj⟩ = b²δij D) ⟨ri ⋅ rj⟩ = 3b²δij
A) Ideal chain models B) Worm-like chain model C) Hindered rotation model D) Real chain models
A) S(R) = Ω(R)/kB B) S(R) = kBΩ(R) C) S(R) = kB ln(Ω(R)) D) S(R) = ln(kBΩ(R))
A) Exactly 25 nm. B) Less than 10 nm. C) More than 100 nm. D) About 50 nm.
A) Ω(R) = R/P(R) B) Ω(R) = P(R)/c C) Ω(R) = cR D) Ω(R) = cP(R)
A) Uniform distribution B) Exponential distribution C) Gaussian distribution D) Binomial distribution
A) Good solvent B) Bad solvent C) None of these D) Theta solvent
A) A Boltzmann factor based on potential energy. B) Persistence length. C) Fixed bond angles due to chemical bonding. D) Positions of minima in rotational potential energy.
A) ΔF = TΔS(R) B) ΔF = S(R)/T C) ΔF = -TΔS(R) D) ΔF = kBΔS(R)
A) Rotational isomeric state model B) Worm-like chain model C) Finite extensible nonlinear elastic model D) Freely-jointed chain model
A) Directed walk B) Brownian motion C) Simple random walk D) Self-avoiding random walk
A) Hindered rotation model B) Rotational isomeric state model C) Freely-rotating chain D) Worm-like chain model |