A new linear amorphous polymer has a Tg of 10 degrees C. At 27 degrees C,...
A new linear amorphous polymer has a Tg of 10 degrees C. At 27 degrees C, it has a melt viscosity of 4x10^8 poises. Estimate its viscosity at 50 degrees C.
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A new linear amorphous polymer has a Tg of 10 degrees C. At 27
degrees C,...
Poly(etherimide) is a strong, stiff and amorphous polymer with a Tg of 218 °C and no...
Poly(etherimide) is a strong, stiff and amorphous polymer with a Tg of 218 °C and no true Tm, showing a gradual softening till it melts at higher temperature. During machining, the polymer showed deformation. Select the most likely reason for the deformation. None of the given. The friction between the machine metal and plastic raises temperature and causes temperature to rise above Tg causing deformation. The polymer decomposes and degrades before softening. It is the wrong choice of polymer for...
polymer physics yes otherwise? 1. To determine the Tg of polymers, which method is NOT applicable?...
polymer physics
yes
otherwise?
1. To determine the Tg of polymers, which method is NOT applicable? (a) dilatometry, (b) OM, (e) DSC. (d) HDT. o d ) T0 sho dai n0 nar onom (o) itivo bos ed do o lT ed 2. To determine the Tm of polymers, which method is NOT applicable? (a) POM, (b) WAXD, (c) SEM, (d) DSC. MGT0 2lsbom tods bne M001 To ulubom oY ed mlog 3. To determine the crystallinity, which method is NOT...
An infinitely long line of charge has linear charge density 6.00×10−12 C/m . A proton (mass1.67×10−27...
An infinitely long line of charge has linear charge density 6.00×10−12 C/m . A proton (mass1.67×10−27 kg, charge +1.60×10−19 C) is 18.0 cm from the line and moving directly toward the line at 2.90×103 m/s. A) Calculate the proton's initial kinetic energy. B) How close does the proton get to the line of charge? for A I got 7.02×10−21
Polymer chemistry If an initiator has a halt-life of 4h, what percentage of this initiator will...
Polymer chemistry
If an initiator has a halt-life of 4h, what percentage of this initiator will remain after 12 h? Which is the better way to increase polymer production rates for free-radical reactions in general (a) increasing temperature or (b) increasing the initiator concentration and why? What is the limiting step in free-radical chain polymerization? What is the advantage of producing free-radicals by UV radiation instead of thermal energy? If [M] = 1 Times 10^-11 mol/L under steady-state conditions, what...
A certain wire has a resistivity of 2 x 10-8 Ohm*m at 20 degrees C. If...
A certain wire has a resistivity of 2 x 10-8 Ohm*m at 20 degrees C. If its length is 213 m and its cross-sectional area is 4 mm2, what will be its electric resistance at 68? (Assume that alpha = 0.005/deg C for this material)
QUESTION 43 (10 Marks) a) Calculate the conductivity of an intrinsic silicon (SI) semiconductor at 27°C...
QUESTION 43 (10 Marks) a) Calculate the conductivity of an intrinsic silicon (SI) semiconductor at 27°C if the hole mobility is 460 cm V's and the electron mobility is 1350 cm? Vis! Assume an intrinsic carrier density of 1.45 x 10 carriers/cm' and an electron charge of -0.16 x 10-4C (3 marks) b) Using Figure 8, calculate the conductivity of the Si intrinsic semiconductor if the temperature is increased to 150°C, assuming the same electron and hole mobilities (2 marks)...
A glass tumbler of 200 g mass and 5 cm inside diameter is filled to a depth of 10 cm with tap water whose temperature is 10 degrees C, and at 50 g of ice 0 degrees C are then added
A glass tumbler of 200 g mass and 5 cm inside diameter is filled to a depth of 10 cm with tap water whose temperature is 10 degrees C, and at 50 g of ice 0 degrees C are then added. At the end of an hour, it is noticed that the ice has just finished melting. What was the average rate, in calories per second, at which heat flowed into the glass from its surroundings?
A material expands from 3.0 meters to 3.0064 meters when it is heated from 10 degrees...
A material expands from 3.0 meters to 3.0064 meters when it is heated from 10 degrees Celsius to 50 degrees Celsius. What is its coefficient of linear expansion? a. 2.4 x 10-2/Co b. 5.3 x 10-5/Co c. 2.6 x 10-5/Co d. 3.25 x 10-5/Co e. 2.5 x 10-2/Co
An object moving in a liquid experiences a linear drag force: D⃗ =(bv, direction opposite the...
An object moving in a liquid experiences a linear drag force: D⃗ =(bv, direction opposite the motion), where b is a constant called the drag coefficient. For a sphere of radius R, the drag constant can be computed as b=6πηR, where η is the viscosity of the liquid. Water at 20 ∘C has viscosity η=1.0×10−3Ns/m2. Suppose a 4.4-cm-diameter, 34 g ball is shot horizontally into a tank of 20 ∘C water. How long will it take for the horizontal speed...
a new liquid substance has been discovered the freezes at 50 degrees celsius. a scientist poured...
a new liquid substance has been discovered the freezes at 50
degrees celsius. a scientist poured the liquid (which was at 50
degrees celsius) into a 0.68 kg cup which caused some, but not all,
of the liquid to freeze (only 0.22 kg of the liquid froze). as a
result, the cup gained 67000 J of heat until thermal equilibrium
was reached. determine the latent heat of the substance & the
initial temperature of the cup.
A new liquid substance...
polymer physics
yes
otherwise?
1. To determine the Tg of polymers, which method is NOT applicable? (a) dilatometry, (b) OM, (e) DSC. (d) HDT. o d ) T0 sho dai n0 nar onom (o) itivo bos ed do o lT ed 2. To determine the Tm of polymers, which method is NOT applicable? (a) POM, (b) WAXD, (c) SEM, (d) DSC. MGT0 2lsbom tods bne M001 To ulubom oY ed mlog 3. To determine the crystallinity, which method is NOT...
Polymer chemistry
If an initiator has a halt-life of 4h, what percentage of this initiator will remain after 12 h? Which is the better way to increase polymer production rates for free-radical reactions in general (a) increasing temperature or (b) increasing the initiator concentration and why? What is the limiting step in free-radical chain polymerization? What is the advantage of producing free-radicals by UV radiation instead of thermal energy? If [M] = 1 Times 10^-11 mol/L under steady-state conditions, what...
QUESTION 43 (10 Marks) a) Calculate the conductivity of an intrinsic silicon (SI) semiconductor at 27°C if the hole mobility is 460 cm V's and the electron mobility is 1350 cm? Vis! Assume an intrinsic carrier density of 1.45 x 10 carriers/cm' and an electron charge of -0.16 x 10-4C (3 marks) b) Using Figure 8, calculate the conductivity of the Si intrinsic semiconductor if the temperature is increased to 150°C, assuming the same electron and hole mobilities (2 marks)...
a new liquid substance has been discovered the freezes at 50
degrees celsius. a scientist poured the liquid (which was at 50
degrees celsius) into a 0.68 kg cup which caused some, but not all,
of the liquid to freeze (only 0.22 kg of the liquid froze). as a
result, the cup gained 67000 J of heat until thermal equilibrium
was reached. determine the latent heat of the substance & the
initial temperature of the cup.
A new liquid substance...
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