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7. How would polymer molecular weight affect the adhesion properties of wood adhesives? (10 pts)
Difference in the molecular weight of formaldehyde compared to similar compounds—How does this difference affect properties (e.g., solubility) to change the range of uses?
7. Please calculate the number-averaged molecular weight and weight-averaged molecular weight for the following polymer. (6 pt) Fraction Mass(g) Mx 104(g/mol)1.24 1.521.361.282.301.504.28 1.21 1181.4567 0.23 0.18 0.56 0.82 3.76 8. A student mixed two batches of PS accidently in the lab, what would be number-averaged molecular weight and weight-averaged molecular weight for this PS mixture. (6 pt) Batch Mass(g) Mw (g/mol) Mn (g/mol 15 75,000 50,000 150,000 120,000
Problem 5.047 A plastic coating is applied to wood panels by first depositing molten polymer on a panel and then cooling the surface of the polymer by subjecting it to airflow at 25°C. As first approximations, the heat of reaction associated with solidification of the polymer may be neglected and the polymer/wood interface may be assumed to be adiabatic. Air Plastic coating (k, α-7) Wood panel If the thickness of the coating is L 2 mm and it has an...
1 Polymer Structure (4 pts) Sketch the repeat unit and determine the repeat unit molecular weight for the following polymers: a. polystyrene b. polytetrafluoroethylene c. polydimethylsiloxane d. nylon 6,10
In general, as the molecular weight of a sample increases, its strength properties such as Young's modulus and tensile strength: A) There is no relationship between these properties B) Decrease C) Increase Save Question 33 (1 point) A polymer sample cooled slowly from 160°C to room temperature using natural convection is likely to be: A) 100% crystalline B) Semi-crystalline C) Transparent D) Semi-conducting E) 100% amorphous
if you were testing to disinfect whose active ingredients had a different molecular weight how would that affect the diameter of the zone of inhibition
Q1 (25 pts) Equal masses of four polymers are blended. The properties of four polymers are as follows: MW PDI 3.00 2.25 Polymer A Polymer B Polymer C Polymer D 120,000 100,000 200,000 300,000 300,000 225,000 400,000 300,000 2.00 1.00 a) Calculate the number average molar mass (Mn) of the blend. (10 pts) b) Calculate the weight average molar mass (Mw) of the blend. (10 pts) c) Calculate the polydispesity index (PDI) of the blend. (5 pts)
How would you make 10 ml of 0.55 mM glucose? The molecular weight of glucose is 180.16 g/mole.
7. A polymer sample is composed of a series of fractions: M x 10-3Mass (mg) 20-60 60-100 100-140 140-180 180-220 220-260 260-300 40 160 360 720 440 228 140 Calculate the number average, weight average from these data. Draw the molecular weight distribution curve and indicate in the plot the position of the weight- and number-average molecular weights. Determine the poly- dispersity of the sample.