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Polychloroprene is an amorphous polymer used in o-rings due to its excellent chemical resistance and has recently been used as an iPod holder. It is known by the trade name neoprene. It has the same mer structure as polybutadiene except that one of the hydrogens next to the double bond is replaced by a chlorine atom. It has a molecular weight of 200,000 g/mol, density of 1.23 g/cc, Tg = -75°C, and Tm = 120°C.
a) Calculate how many chlorine atoms will be in an average neoprene chain?
b) Sketch the bonding between polychloroprene chains due to sulfur linkages as neoprene is vulcanized into an elastomer.
c) You decide to go swimming in Bear Lake in late November using a neoprene wet suit. Calculate the difference in viscosity (in Pa-s) between the inside and the outside of the wet suit if the water temperature is 5°C and your well-insulated wet suit keeps your body at 37°C.
Set up a table showing curve elevations at the PVC, at the PVT, and at the half-station points along the curve. Compute the station and elevation of the curve turning point.
A U manometer reads 20 cm air as operating fluid and a given manometric fluid. A single branch closed tube reads 35 cm connected to point 1. If P2 = 1.2 ATM calculate the pressure in point 1 and the density of the manometric fluid.
A glass jar is heated in an oven and sealed when the air pressure is 103 kPa and the temperature is 105 C. Find the absolute, gage, and vacuum pressures in the jar when it cools to 20 C.
Would a 30 slot stainless steel screen (2.0 m long; located at the bottom of the well) have sufficient collapse strength for this application?
If the hydraulic head in the canal is 100 ft and in the drainage ditch it is 80 ft calculate the maximum mounding height and the mounding distance from the canal that will occur if the farmer irrigates at a rate of 2 acre-ft/acre/year.
Predict the aqueous phase equilibrium concentration of phenanthrene at 25*C if the values for this compound are Cs = 1.1 mg/L, P^v = 1.6 x 10^-7 atm, KH = 4.0 x 10^-5 atm*m^3/mol, and logKow = 4.52.
An experiment was conducted to determine the hydraulic conductivity of an artesian aquifer. The piezometric heads at two points 150m apart were found to be 55 m and 48.5 m above a datum.
determine the dimensions of an ideal circular settling tank that can remove 0.01-in diameter particles with a specific gravity of 1.01. Use a detention time of 1.5 hours, flowrate= 4ft^3/sec, the specific weight of water=62.4 lb/ft^3
The specific weight (wt./Vol.) of brass is 520 lb/ft^3. Determine its density (mass/vol.) in SI units. Use an appropriate prefix.
a ball is thrown with a valocity of 30 m/s at an angle of 40 degrees above the horizontal from the top of a 100m tall building. what is balls velocity when it lands. (neglect air resistance in both cases) DO NOT USE 2D projectile motions, only work ..
The position of a particle moving along an x axis is given by x = 17t2 - 5.0t3, where x is in meters and t is in seconds. (a) Determine the position, velocity, and acceleration of the particle at t = 3.0 s. x = m v = m/s a = m/s2
an incident occurs on a freeway that has a capacity in the northbound direction, before the incident, of 4000 veh/h and a constant flow of 2900 veh/h during the morning commute.
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