UNIVERSITY OF TORONTO
FACULTY OF APPLIED SCIENCE AND ENGINEERING
FINAL EXAMINATION, December 15, 2018
DURATION: 2 and 1/2 hrs
CHE5621-11 F— APPLIED POLYMER CHEMISTRY
Calculator Type: 2
Exam Type: B
Examiner P. Yaneff
-
Full Name (as registered in ROSI):
SN#:
Instructions:
The exam is made up of 2 parts.
Ensure your copy of the exam has all 8 pages, page numbers indicated on the bottom of each page.
Marks for each question and section are indicated.
Write all your answers in an exam booklet EXCEPT multiple choice which you do on this exam and submit
both for marking. Put exam questions inside your booklet. Make sure your name is written on both.
Part 1 Multiple choice /30
Part 2 Questions and problems /100
Total /130
, PART 1 (30 Marks plus I Bonus Question)
1. The melting points for the polymers shown below range from 110 to 260 00.
The polymer exhibiting the highest melting point would be:
Low density polyethylene
Polypropylene
(C) Polybutylene
(d) Polyethylene terephthalate
2. If a particular type of polypropylene has a molecular mass of 150,000 g/mol,
what is its degree of polymerization? The molar mass of the repeating unit is 42
g/mol.
5357
8714
2679
3571
3. Which statement is incorrect?
An atactic stereoisomer has pendant groups of atoms randomly arranged along
a vinyl polymer chain.
An isotactic stereoisomer has pendant groups of atoms all on the same side of
a vinyl polymer chain.
A syndiotactic stereoisomer has pendant groups of atoms regularly alternating
in positions on both sides of the vinyl polymer chain.
An atactic stereoisomer has pendant groups of atoms regularly arranged along
a vinyl polymer chain.
4. Which statement is incorrect?
Plasticizers are chemical agents added to plastic compounds to improve
flow and processibility and reduce brittleness.
Fillers are low cost inert substances added to plastics and coatings to make
them less costly. Fillers may also improve some physical properties such as
tensile strength, impact strength, hardness and wear resistance.
Pigments are particles added to materials to give colour.
Processing aids are never added to plastics.
5. True or false? Vulcanization is a chemical reaction that causes crosslinking of
polymer chains and usually refers to the crosslinking of rubber with sulphur.
True
False
2
FACULTY OF APPLIED SCIENCE AND ENGINEERING
FINAL EXAMINATION, December 15, 2018
DURATION: 2 and 1/2 hrs
CHE5621-11 F— APPLIED POLYMER CHEMISTRY
Calculator Type: 2
Exam Type: B
Examiner P. Yaneff
-
Full Name (as registered in ROSI):
SN#:
Instructions:
The exam is made up of 2 parts.
Ensure your copy of the exam has all 8 pages, page numbers indicated on the bottom of each page.
Marks for each question and section are indicated.
Write all your answers in an exam booklet EXCEPT multiple choice which you do on this exam and submit
both for marking. Put exam questions inside your booklet. Make sure your name is written on both.
Part 1 Multiple choice /30
Part 2 Questions and problems /100
Total /130
, PART 1 (30 Marks plus I Bonus Question)
1. The melting points for the polymers shown below range from 110 to 260 00.
The polymer exhibiting the highest melting point would be:
Low density polyethylene
Polypropylene
(C) Polybutylene
(d) Polyethylene terephthalate
2. If a particular type of polypropylene has a molecular mass of 150,000 g/mol,
what is its degree of polymerization? The molar mass of the repeating unit is 42
g/mol.
5357
8714
2679
3571
3. Which statement is incorrect?
An atactic stereoisomer has pendant groups of atoms randomly arranged along
a vinyl polymer chain.
An isotactic stereoisomer has pendant groups of atoms all on the same side of
a vinyl polymer chain.
A syndiotactic stereoisomer has pendant groups of atoms regularly alternating
in positions on both sides of the vinyl polymer chain.
An atactic stereoisomer has pendant groups of atoms regularly arranged along
a vinyl polymer chain.
4. Which statement is incorrect?
Plasticizers are chemical agents added to plastic compounds to improve
flow and processibility and reduce brittleness.
Fillers are low cost inert substances added to plastics and coatings to make
them less costly. Fillers may also improve some physical properties such as
tensile strength, impact strength, hardness and wear resistance.
Pigments are particles added to materials to give colour.
Processing aids are never added to plastics.
5. True or false? Vulcanization is a chemical reaction that causes crosslinking of
polymer chains and usually refers to the crosslinking of rubber with sulphur.
True
False
2
