Homework Questions2
Name: ____________________________________
1. Define Polyvinyls, PS, PP, HDPE, chemical structure.
2. Compare the density PVC, PVB, PS, and PVDC which is higher/lower than PP.
3. Compare the density of HDPE, LDPE, UHMWPE, LLDPE to PP?
4. What is the tensile strength of PP with 0%, 30% glass fibers? What is the tensile modulus?
_______________________________________________
5. (4 points) Plot tensile strength and tensile modulus of PVC, PS, PP, LDPE and HPDE with density on x-axis and strength on y-axis
on one graph and density on x-axis and modulus on y-axis.
5
Tensile Strength (ksi)
Tensile Modulus (ksi)
5.0E+02
3.0E+02
1.0E+02
-1.0E+02
0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0
4
3
2
1
0
0.0
0.2
0.4
0.6
0.8
density
1.0
1.2
1.4
1.6
1.8
2.0
density
9. Four typical Physical Properties of PVC are Optical = ___________, Resistance to moisture= _____ , UV resistance= _________,
solvent resistance= ____________
10. The Advantages of PP are ______________________________________________.
11. The Disadvantages of PP are ____________________________________________________.
12. Glass fiber affects PP by (strength) _______, (modulus) ______________, (impact) ____________, (density) __________, and
(cost) _______________
13.PVC is blended with what two materials? ___________________ and ________________
14. Define Polypropylene chemical structure
15. Does commercial PP have Isotactic, atactic, or sydiotactic form.
16. If MW of PP is 200,000, what is the approx. DP? __________
17. Polydispersity represents the distribution of ____________________________
18. Density of PP is __________ . Is it higher/lower than HDPE? __________________
19. Are mechanical properties of PP higher or lower than LDPE and HDPE?
20. Five
polyolefins are _______________________________________________________________