Essential Organic Chemistry, Global Edition
3rd Edition
ISBN: 9781292089034
Author: Paula Yurkanis Bruice
Publisher: PEARSON
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Question
Chapter 15, Problem 34P
Interpretation Introduction
Interpretation:
The structure of the graft polymer obtained by the given reaction should be determined.
Concept Introduction:
Monomers combine together to form polymers. Monomers are the repeating units of small molecules which link together to form polymers and the process is called as
Two types of polymers:
- Synthetic and biopolymers.
- DNA is an example for biopolymer and these type of polymers are synthesized by cells.
- Polymers synthesized by scientists are called
synthetic polymers and some examples are nylon, polyester etc.
Two types of synthetic polymers:
- Chain-growth
polymers or addition polymers and Step-growthpolymers or Condensation polymers. - Chain growth polymers are formed by the monomer addition to the end of a growing chain.
- Step-growth polymers are formed by combining monomers by removing small molecules of water or alcohol.
- Polymers formed from two or more different monomers are called copolymers.
- Classified into alternating copolymer, block copolymer, graft copolymer and also random copolymer.
Figure 1
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(a
4 shows scanning electron microscope (SEM) images of extruded
actions of packing bed for two capillary columns of different diameters,
al 750 (bottom image) and b) 30-μm-i.d. Both columns are packed with the
same stationary phase, spherical particles with 1-um diameter.
A) When the columns were prepared, the figure shows that the column with
the larger diameter has more packing irregularities. Explain this observation.
B) Predict what affect this should have on band broadening and discuss your
prediction using the van Deemter terms.
C) Does this figure support your explanations in application question 33?
Explain why or why not and make any changes in your answers in light of
this figure.
Figure 4 SEM images of
sections of packed columns
for a) 750 and b) 30-um-i.d.
capillary columns.³
fcrip
= ↓ bandwidth Il temp
32. What impact (increase, decrease, or no change) does each of the following conditions have on the individual
components of the van Deemter equation and consequently, band broadening?
Increase temperature
Longer column
Using a gas mobile phase
instead of liquid
Smaller particle stationary phase
Multiple Paths
Diffusion
Mass Transfer
34. Figure 3 shows Van Deemter plots for a solute molecule using different column inner diameters (i.d.).
A) Predict whether decreasing the column inner diameters increase or decrease bandwidth.
B) Predict which van Deemter equation coefficient (A, B, or C) has the greatest effect on increasing or
decreasing bandwidth as a function of i.d. and justify your answer.
Figure 3 Van Deemter plots for hydroquinone using different column inner diameters (i.d. in μm). The data was
obtained from liquid chromatography experiments using fused-silica capillary columns packed with 1.0-μm particles.
35
20
H(um)
큰 20
15
90
0+
1500
100
75
550
01
02
594
05
μ(cm/sec)
30
15
10
Chapter 15 Solutions
Essential Organic Chemistry, Global Edition
Ch. 15.2 - Prob. 1PCh. 15.2 - Prob. 2PCh. 15.2 - Prob. 3PCh. 15.2 - Prob. 4PCh. 15.2 - List the following groups of monomers in order...Ch. 15.2 - List the following groups of monomers in order...Ch. 15.2 - Prob. 7PCh. 15.2 - Why does methyl methacrylate not undergo cationic...Ch. 15.2 - Which monomer and which type of initiator would...Ch. 15.2 - Prob. 10P
Ch. 15.2 - Prob. 11PCh. 15.5 - Draw a short segment of gutta-percha.Ch. 15.5 - Prob. 13PCh. 15.6 - Prob. 14PCh. 15.8 - Prob. 15PCh. 15.8 - Prob. 16PCh. 15.8 - Prob. 17PCh. 15.8 - a. Propose a mechanism for the formation of the...Ch. 15.8 - Propose a mechanism for the formation of Melmac.Ch. 15.8 - Explain why, when a small amount of glycerol is...Ch. 15.10 - Prob. 21PCh. 15 - Draw short segments of the polymers obtained from...Ch. 15 - Prob. 23PCh. 15 - Draw the structure of the monomer or monomers used...Ch. 15 - Draw short segments of the polymers obtained from...Ch. 15 - Prob. 26PCh. 15 - Prob. 27PCh. 15 - Prob. 28PCh. 15 - A particularly strong and rigid polyester used for...Ch. 15 - Prob. 30PCh. 15 - Prob. 31PCh. 15 - Prob. 32PCh. 15 - Prob. 33PCh. 15 - Prob. 34PCh. 15 - Prob. 35PCh. 15 - Delrin (polyoxymethylene) is a tough...
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