1 Polymer Structure (4 pts) Sketch the repeat unit and determine the repeat unit molecular weight...
a) compute the repeat unit molecular weight of polystyrene b) compute the number-average molecular weight for polystyrene for which the degree of polymerization is 26,000. 54 (a) Compute the repeat unit molecular weight of polystyrene. (b) Compute the number-average molecular weight for a polystyrene for which the degree of polymerization is 26,000.
14. (a) Compute the repeat unit molecular weight of polystyrene and the number-average (b) Viscoelastic creep of some polymer materials can be modelled using a spring and dashpot molecular weight of the material if the degree of polymerisation is 25,000. in parallel configuration as shown in the following figure. Derive the mathematical expression for the strain as a function of time. 凹η (6+6 marks
Compute the repeat unit molecular weight of polystyrene. (b) Compute the number-average molecular weight for a polystyrene for which the degree of polymerization is 25,000. Please write legibly Please handwrite.
The properties of a specific polymer depend only on the chemical structure of its repeat unit and its molecular weight. True or false? And explaination.
4 (20 Points) Calculate the number-average molecular weight and the weight average molecular weight of a polymer sample made of polystyrene with a repeat unit of (CH2- CH(CHs)) and composed of two types of chains. 60 percent of the chains have a degree of polymerization of 7,000 and the rest 50,000. Carbon has an atomic weight of 12 g/mol and hydrogen is 1 g/mol.
Molecular weight data for some polymer are tabulated. Determine: a) The number-average molecular weight b) The weight-average molecular weight c) What is the number-average degree of polymerization for this polymer? d) What is the weight-average degree of polymerization for this polymer? Side note: Please consider the monomer C3H6 Molecular weight data for some polymer are tabulated. Determine: The number-average molecular weight The weight-average molecular weight What is the number-average degree of polymerization for this polymer? What is the weight-average degree...
Polymer Chemistry: Problem 2. Polystyrene chains dissolved in cyclohexane at 35°C (theta conditions) can be separated by ultrafiltration according to molecular weight. The ultrafiltration process employs pressure-driven flow of a solution through a porous membrane to separate solutes by their molecular size. Molecules larger than the pore size are retained upstream of the membrane while smaller molecules pass through. In this exercise, the root mean square end-end- distance will be considered to provide an appropriate measure of molecular size. The...
3 Match the following polymer with the common product in which it is used (see intro for help). 1. polystyrene 2. nylon 3. polypropylene 4. low density polyethylene 5. polycarbonate a. Plastic Bags b. Water Pipes c. Cookware d. Egg containers e. Milk cartons 6. polyethylene f. Carpet and Knitted fabrics 7. polyvinylchloride 9. Automobile bumpers 8. polytetrafluoroethylene h. Rope 4. Shown below are monomers for common polymers that get made. Draw two repeating units of the polymer structure for...
Draw the structure of the repeat unit of the polymer that results when this diamine and this diacid are heated together: Polymer Synthesis Question 1 Draw the structure of the repeat unit of the polymer that results when this diamine and this diacid are heated together: 1 pt 1 pt 1 pt 1 pt 1 pt Question 2 diamine diacid Question 3 Question 4 но он Question 5 Question 6 You do not have to consider stereochemistry. You do not...
1) (25 points) The molecular weight of a polymer can be determined from its viscosity by the following relationship where [n] is the intrinsic viscosity of the polymer M, is the viscosity averaged molecular weight, and K and a are constants specific for the polymer. The intrinsic viscosity is determined experimentally be determining the efflux time, or the time it takes for the polymer solution to flow between two etched lines in a capillary viscometer, at several different concentrations of...