If we are talking about viscoelastic modulus or viscoelastic relaxation modulus in polymers, indicate the correct option.(A). It reports the variation of elastic behavior as a function of time.(B). It is only useful for defining its glass transition temperature.(C). It only allows us to define the polymer degradation temperature.(D). Neither option is correct.
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If we are talking about viscoelastic modulus or viscoelastic relaxation modulus in
(A). It reports the variation of elastic behavior as a function of time.
(B). It is only useful for defining its glass transition temperature.
(C). It only allows us to define the polymer degradation temperature.
(D). Neither option is correct.
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- An 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.polymers made with free radical polymerization were measured: poly (n-butyl methacrylate), poly(methacrylic acid), poly(n-hexyl methacrylate), poly(methyl methacrylate) and poly(t-butyl methacrylate). Measured values for the glass transition temperatures were: 501, 388, 378, 293, and 268 K. Assign the correct value for Tg to each polymer sample, explaining your reasoning.Suppose polyethylene molecules in solution can exist either as a single version of a random coil (that is, ignore the fact that a random coil can be achieved in many different ways) or fully stretched out, with the latter conformation 2.4 kJ mol-1 higher in energy. What is the ratio of the twoconformations at 20 °C?
- 6.) An unknown polymer sample is fractionated, and the following molar fractions are obtained. Calculate Mn and Mw and the dispersity. Fill out the table to show your work. Fraction # 1 2 3 4 5 6 n₁ (mol) 0.004 0.011 0.009 0.003 0.017 0.008 M; (g/mol) 10,400 12,080 13,950 16,700 18,150 20,000 n¡Mi n;M;²Viscometer is used to measure the viscosity of a series of dilute solutions of a polymer in toluene at 30°C. (1) Intrinsic viscosity is the most useful of the various viscosity designations because it can be related to molecular weight by the Mark-Houwink-Sakurada equation, [n] = KM. Calculate the viscosity average molecular weight for this polymer by using the data given in Table 2. Given that the Mark-Houwink constant, K is 12 x 10-5 dl/g and a = 0.71. 0.505 0.595 0.804 Concentration 0 (g/dL) Flow time (s) 67.94 0.402 107.70 121.05 Table 2 132.77 161.39 1.207 227.84kindly help me with this problem thank you Subject: PHYSICAL CHEMISTRY INSTRUCTIONS: solve as neatly as possible and show complete solution. Round your final answer to four decimal places and box highlight all final answers. all values must include proper units with proper conversion if needed in your solution. kindly follow this format Given Required Solution thank you so much!
- . These resins are organic polymeric networks that contain functional groups that are permanently attached to the resin. One such functional group is sulfonic acid, -SO3H. When placed in water, the resin (being a large organic molecule) will not dissolve. However, the ionic functional groups become hydrated and the resin will swell as it takes up waters of hydration. The resin may then be thought of as a solid solution mixture with the functional groups being "dissolved" but the polymer remaining as a solid. The hydronium ion (H3O+) associated with acidic functional groups like sulfonic acid will dissociate just as it would if the acid were free of the resin. If other cations such as Cu2+ or Na+ are added to the resin, an ion-exchange reaction can occur: . Note that one H+ is released for each positive charge bound to the resin. Since the resin exchanges a hydrogen ion for a sodium ion in this reaction, sulfonic acid resins are called cation-exchange resins. Equilibrium constants may…Q2: Consider a molecular interaction denoted as X-HY, where "-" signifies a covalent bond and "..." indicates hydrogen bonding. The system can be described as a superposition of three structures: |X-HY-)= V1+s 1 0 (s) |X:, H+,: Y-) = (1); |X:-, H-Y) = 0 0 0 (s), 1 where 0 < s << 1. The first (last) structure represents a pure covalent bond between the atoms X (Y) and H, with Y (X) carrying a negative charge. The middle structure depicts an ionic configuration where X and Y bear negative charges, while H carries a positive charge. In this structure, there is no covalent bond. The Hamiltonian for this molecular system reads 0 0 2€ 2€ 0 H=(0 -E မဝါဝ I a) Determine the expected energies for the covalent structures IX-H, Y) and (X:-, H-Y). b) Calculate the expected energy for the ionic structure IX: H: Y) and compare its stability with the covalent structures.If the adsorption of a gas onto a surface is found, somewhat unusually, to be endothermic, what can be said about the entropy change on adsorption?

