Kindly solve it completely by hand if possible. Molecular weight data for some polymer are tabulated here. Compute (a) the number-averagemolecular weight, (b) the weight-average molecular weight. (c) If it is known that this material's degree ofpolymerization is 710, which one of the polymers listed in Table 14.3 is this polymer? Why?Molecular WeightRange g/mol15,000-30,000XiWi0.040.0130,000-45,0000.070.0445,000-60,0000.160.1160,000-75,0000.260.2475,000-90,0000.240.2790,000–105,0000.120.16105,000-120,0000.080.12120,000-135,0000.030.05

Step 1: Calculate the mid-point of each molecular weight range First, we will find the mid-point of…

Answered: Molecular weight data for some polymer…

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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An unknown polymer sample was found to have the following molecular weight distribution: Molecular weight range 8,000 - 20,000 20,000 - 32,000 32,000 - 44,000 44,000 - 56,000 56,000 -68,000 68,000 -80,000 80,000 - 92,000 Having a DP=763, which of the following common polymers is this sample? Xi 0.05 0.15 0.21 0.28 0.18 0.10 0.03 Wi 0.02 0.08 0.17 0.29 0.23 0.16 0.05 Select one: O a. Polymethylmethacrylate with a monomer molecular weight of 100.121 g/mol O b. Polystyrene with a monomer molecular weight of 104.15 g/mol Polycarbonate with a monomer molecular weight of 61.0168 g/mol O c. O d. Polyvinyl chloride with a monomer molecular weight of 62.498 g/mol Polypropylene with a monomer molecular weight of 42.08 g/mol O e.
The repeat unit MW of an unknown polymeric material is 230 g/mol and has the following composition. With the information provided below calculate: -mers 80 % O The number-average MW O The weight-average MW 0 Dispersity 5 90 25 100 30 120 25 150 15
Molecular weight data for some polymer are tabulated here. Compute (a) the number-average molecular weight, (b) the weight-average molecular weight. (c) If it is known that this material's degree of polymerization is 710, which one of the polymers listed in Table 14.3 is this polymer? Why? Molecular Weight Range g/mol 15,000-30,000 Xi Wi 0.04 0.01 30,000-45,000 0.07 0.04 45,000-60,000 0.16 0.11 60,000-75,000 0.26 0.24 75,000-90,000 0.24 0.27 90,000 105,000 0.12 0.16 105,000-120,000 0.08 0.12 120,000-135,000 0.03 0.05
For a given polymer, the activation energy for the stress relaxation was measured to be 59kj/mol. If the stress relaxation time for this polymer at 7 degree Celsius is 3150 seconds. What is the relaxation time at 110 degree Celsius
Q5 (a) Figure 6 shows two types of polymeric products fabricated using different processing techniques. Suggest with justification for the type of processes used to produce the products: i. Product A ii. Product B A B Figure 6. Two types of polymeric products (a) plastic bottles and (b) plastic car boot tray (b) The molecular weight data of a Polymer X are given in Table 3. Once undergone a melting process, it achieves degree of polymerization, DP of 498 upon solidification. i. Calculate the number-average molecular weight (Mn) for the polymer. ii. Calculate the molecular weight for monomers of the Polymer X. iii. Prove that the Polymer X is a polytetrafluoroethylene (PTFE) with chemical formula of (C2F4)n- Given the atomic weights for carbon, C is 12.011 g/mol and fluorine, F is 18.998 g/mol.
An unknown polymer sample was found to have the following molecular weight distribution: Molecular weight range 8,000 - 20,000 20,000 - 32,000 32,000 - 44,000 44,000 - 56,000 56,000 - 68,000 68,000 -80,000 80,000 - 92,000 0.03 Knowing that the monomer is methyl methacrylate, which of the below is the number average degree of polymerization for this polymer sample? Select one: O a. O b. DP 476 O C. DP = 338 DP = 664 O d. DP 544 O e. DP = 801 Xi 0.05 0.15 0.21 0.28 0.18 0.10 Wi 0.02 0.08 0.17 0.29 0.23 0.16 0.05
Question Seven (Plastics) The data below is from a fibre reinforced plastic. Would this composite be suitable for use at 400°C? Explain your answer. Temperature (°C) 20 100 200 300 400 500 600 Plastic A Plastic B Plastic C Yield Strength (MPa) 270 350 47 Tensile Strength (MPa) 300 500 52 E (GPa) 130 3 14 115 100 95 Question Eight (Plastics) Identify the thermoplastic, the elastomer and the thermoset. 70 58 0 Young's Modulus (GPa) Elongation (%) 12 3 600
An unknown polymer sample was found to have the following molecular weight distribution: Molecular weight range xi 8,000 -20,000 0.05 20,000 - 32,000 0.15 32,000 44,000 0.21 44,000 56,000 0.28 56,000 -68,000 0.18 68,000 - 80,000 0.10 80,000 - 92,000 0.03 Having a DP=763, which of the following common polymers is this sample? Select one: wi 0.02 0.08 0.17 0.29 0.23 0.16 0.05 a. Polymethylmethacrylate with a monomer molecular weight of 100.121 g/mol b. Polyvinyl chloride with a monomer molecular weight of 62.498 g/mol c. Polycarbonate with a monomer molecular weight of 61.0168 g/mol d. Polypropylene with a monomer molecular weight of 42.08 g/mol e. Polystyrene with a monomer molecular weight of 104.15 g/mol
Connecting rod (as shown below) is a car part that connects engine piston to crankshaft and converts reciprocating motion into rotating motion. It performs under load at high temperature around 150°C. Long carbon fiber thermoplastic composite (LFT) with 30% carbon fiber has been considered to replace metal (steel or aluminum) rod to improve efficiency. Based on the data for different polymers listed in the table above, which polymer(s) would you choose as the polymer matrix for the connecting rod? What is your rationale?
( B ) A stress of 6.7 MPa is employed to one type of a polymer under constant strain . After 40 days at 20 ° C the stress is reduced to only 8.4 MPa . When the same polymer is heated to 40 ° C the relaxation time is 40 days . 1- Calculate the relaxation time constant for this material at 25 ° C ? 2- Estimate the stress after 50 days at 25 ° C ? 3- Estimate the stress relaxation activation energy for the same polymer .
An unknown polymer sample was found to have the following molecular weight distribution: Molecular weight range Wi 8,000 - 20,000 0.05 0.02 20,000 – 32,000 0.15 0.08 32,000 - 44,000 0.21 0.17 44,000 – 56,000 0.28 0.29 56,000 - 68,000 0.18 0.23 68,000 - 80,000 0.10 0.16 80,000 - 92,000 0.03 0.05 Which of the following common polymers is this sample? (This question has only one correct answer)
Compression molding is a manufacturing process in which the molding material is preheated then placed in an open mold cavity where the compressive action of the punch forces the polymer into the desired shape as shown in the figure below. Based on your understanding of the behavior of polymers, which of the statements below regarding compression molding of polymers are accurate? Punch Cavity C. -Upper mold half Charge 41 (1) -Lower mold half Knock-out pin V, F |x.F (2) and (3) Molded part a. Lower operating temperatures are more desirable as they reduce viscosity making it easier to fill the cavity b. This process can only be used for thermosets as they can thermally cure from monomer state This process can be used for both thermosets and thermoplastics as they can both be thermally shaped d. This process is suitable for rubber, PVC and polymethyl methacrylate

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