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- Show the derivation of the Langmuir isotherm into its linearized formAn experimental method of determining solubility parameters of polymers involves taking lightly crosslinked (network) samples of the polymers in question and immersing them in different solvents whose solubility parameters are known. Explain the rationale behind this method.In a free-radical polymerization that proceeds in the absence of chain transfer, what would be the effect of (a) increasing the monomer concentration [M] four times at constant initiator concentration [I] and (b) increasing [I] four times at constant [M] upon (i) the total radical concentration at steady state, (ii) the rate of polymerization, and (iii) the number-average degree of polymerization
- In this table the Kr volume adsorbed on an active carbon surface are given, as a function of the pressures, at 193.5 K. a) Does this data fit well to a Langmuir isotherm? If yes, determine vm and b.For a molecule, the phosphorescence lifetime without quenching is 1.0 s while with a quencher population of 10-2 M the phosphorescence lifetime is 0.10 s. Calculate the rate constant for phosphorescence assuming that kisc >> (kF + kec + kic). Calculate the rate constant for external conversion of the triplet state (kec’), the quenching rate constant for the triplet state (kq’), and the Stern-Volmer quenching constant. Assume that intersystem crossing from T1 to So is negligible.The volume of O2(g) adsorbed on a surface of 1 g of a silica sample at 5°C is V1=1.4 cm3 at P1=95.1 torr and V2=10.6 cm3 at P2=760 torr. Identify the maximum volume of oxygen, Vm, that can be adsorbed. Consider the Langmuir isotherm model
- Ziegler-Natta polymerization can produce isotactic polymers of 1-hexene. Review the propagation Cossee mechanism. Use 1-hexene as the monomer, write down the propagation mechanism responsible for the formation of isotactic polymer.Give advantages of Ziegler–Natta catalysts ?Producing a polymer part whose medium of use will be water at a constant temperature of 90°Cis considered. Dimensional stability is of great importance during the use of this part.As it is stated that; The polymer of the formula below is suitable for such an application.Write down the reasons why ?
- 2. The onset of the glass transition temperature Tg of the following polymers was measured: • poly(n-butyl methacrylate) (CAS# 9003-63-8) • poly(methacrylic acid) (CAS# 25087-26-7) • poly(n-hexyl methacrylate) (CAS# 25087-17-6) • poly(methyl methacrylate) (CAS# 9011-14-7) • poly(t-butyl methacrylate) (CAS# 25189-00-8) The measured values, in decreasing order, were: 228oC, 115oC, 110oC, 20oC, and -5oC. Assign the correct Tg to each polymer. Draw the structure for each polymer to help explain your answer. Support and explain your answer in your own wordsConfirm that the following CO adsorption data on activated carbon at 273 Kfollow the Langmuir or Freundlich isotherm and determine the volumecorresponding to the complete coverage of the surface.In copolymerization of two monomers (M1 and M2), copolymers of different microstructure may form as a result of their relative reactivity ratio (r). Define the reactivity ratio (r) for copolymerization with words and equations. In the radical copolymerization of acrylonitrile 1 and alpha methyl styrene 2 , r1= 0.04 and r2= 0.20 , which of the following best describes the microstructure of the forming copolymer : random, blocky or alternating. Briefly explain it