Review for Chap 10-13
Apr. 30, 2016
Chap 10 Networks, gels and rubber elasticity
Networks
A2
AB
AB2
Gel point
Ideal rubber elasticity
True stress
Engineering stress
Elastically effective strands
Chap 11 Linear Viscoelasticity
Two models
Maxwell
Voigt
Chem/ChEn/MatS 4214
Spring, 2016
Homework Set #11
Due in class, Friday, May 6
1 (3 points). Hiemenz & Lodge, Chap 12, Problem 7.
2 (3 points) For (semi)crystals of cis-1,4-polyisoprene (-(C5H8)n-) the following data have been
reported:
class
a
b
c
H
S
M0
Chem/ChEn/MatS 4214
Spring, 2016
Homework Set #6
Due in class, Friday, March 25
1 (3 points). Consider to mix polystyrene (MPS = 105 g/mol) with 1,4 polyisoprene (MPI = 105 g/mol). Use
the volume of styrene monomer as the reference volume.
(a) Whats the c
Chem/ChEn/MatS 4214
Spring, 2016
Homework Set #10
Due in class, Friday, April 29
1 (3 points). Estimate the longest viscoelastic relaxation time, 1, for dilute polystyrene chains
with M =107 g/mol in benzene at 25 C and in cyclohexane at 35 C. Use data fr
Chem/ChEn/MatS 4214
Spring, 2016
Homework Set #5
Due in class, Friday, March 11
1 (3 points). Osmotic pressure measurements require good membranes, to allow solvent to pass freely but
solutes to be excluded. Assume a membrane has perfectly uniform cylindr
Chem/ChEn/MatS 4214
Spring, 2016
Homework Set #7
Due in class, Friday, April 1
1 (3 points). Hiemenz & Lodge, Chap 7, Problem 4.
2 (3 points). Hiemenz & Lodge, Chap 8, Problem 13.
3 (3 points). The following data of R 106 (cm-1) were obtained for a sample
Chem/ChEn/MatS 4214
Spring, 2016
Homework Set #4
Due in class, Friday, March 4
1 (3 points). The following plot shows the equilibrium monomer concentration versus temperature for
1,3,5-trioxane, a cyclic trimer of formaldehyde that can be used to prepare
Chem/ChEn/MatS 4214
Spring, 2016
Homework Set #9
Due in class, Friday, April 22
1 (3 points). A 10 m cylinder, 1 cm diameter, of polyisoprene (Mw = 60,000 g/mol, = 0.9
g/cm3) is going to be used to make a bungee cord.
(a) Whats the minimum weight of sulfu
Chem/ChEn/MatS 4214
Spring, 2016
Homework Set #8
Due in class, Friday, April 15
1 (3 points). The overlap concentration c*, which separates the dilute solution regime from the
so-called semidilute regime, can be estimated by space-filling arguments, as th
Chem/ChEn/MatS 4214
Spring, 2016
Homework Set #2
Due in class, Friday, February 12
1 (3 points). In step-growth polymerization, for the Most Probable Distribution the mole fraction of any
particular i-mer should go through a maximum with time, as the reac
10Oct2016
Extra 2017 Mass Balance problems
Problem 9
The 2015 Nobel Prize in Medicine is awarded to the discoverer of the anti-malarial drug artemisinin
(C15H22O5). The biological synthesis of artemisinin involves a set of three reactions specified below:
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ChEn 2001 Fall 2015
Recitation Problems for Mass Balances
Problem 1. Fall 2012 Mid-term 1 [25 points] A process to manufacture vinyl chloride (C2H3Cl) involves a set
of three reactions specified below:
C2H4 + Cl2 C2H4Cl2
C2H4 + HCl + O2 C2H4Cl2 +H2O
C2H4C
ChEn 2001 Fall 2016
Due Date: Wed 14 September 2016
Homework 1
Problem 1: Solve the following differential equations, you must show your work to receive full
credit.
= cos 2
1 = 1
= 2 + !
1 = 4
= !
1 = 2
= 2
0 = 1
Problem 2. Use a set of lin
ChEn 2001 Fall 2016
Due Date: Mon 26 September 2016
Homework 3
Problem 1. Perform the following unit conversions:
(a) A hypersonic jet that flies at five times the speed of sound (the speed of sound is 1100 ft/s).
How fast is it going in miles per hour?
(
ChEn 2001 Fall 2016
Due Date: Monday 19 September 2016
Homework 2
For this whole assignment - Check that individual reactions are balanced. You may balance
individual reactions without showing all the atom balance equations. But use and show the
generatio
ACCIDENTS IN MINES
Important Causes
Roof fall- Accidental fall of roof or side during
excavation.
Explosives- Accidents while using Explosives.
Electricity- Accidents resulting out of use of Electricity.
Inundation- Due to sudden rushing in of water.
AERF Internship Application Form
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May 4, 1970: Kent State
Shootings
What Happened?
On May 4, 1970, the
Ohio National Guard
shot at unarmed
student demonstrators
at Kent State
University, killing 4 and
injuring 9.
Why were the students protesting?
- Nixon elected President in
1968; promise
AERF Internship Application Form
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