(a)
Interpretation: An explanation for the differences observed in the
Concept introduction: The glass transition temperature and the melt transition temperature are often used to characterize the behavior of a polymer on heating. They are denoted by
Answer to Problem 30.37P
The given
Explanation of Solution
The given pair of polymers is,
Figure 1
The above polymer chains have both crystalline regions and amorphous regions. The ordered crystalline regions are called crystallites. Crystallites are the sections where polymer chain is bind together by intermolecular interactions. On the contrary amorphous regions are sections where polymer chains are randomly arranged. These sections are held together by weak intermolecular interactions.
A polymer containing high crystallites area possesses high
The given
The given
(b)
Interpretation: An explanation for the differences observed in the
Concept introduction: The glass transition temperature and the melt transition temperature are often used to characterize the behavior of a polymer on heating. They are denoted by
Answer to Problem 30.37P
The given
Explanation of Solution
The given pair of polymers is,
Figure 2
The above polymer chains have both crystalline regions and amorphous regions. The ordered crystalline regions are called crystallites. Crystallites are the sections where polymer chain is bind together by intermolecular interactions. On the contrary amorphous regions are sections where polymer chains are randomly arranged. These sections are held together by weak intermolecular interactions.
A polymer containing high crystallites area possesses high
The given
The given
(c)
Interpretation: The comparison between the
Concept introduction: The glass transition temperature and the melt transition temperature are often used to characterize the behavior of a polymer on heating. They are denoted by
Answer to Problem 30.37P
The
Explanation of Solution
Kevlar is a polyamide, synthesized by
Figure 3
Since more ordered polymers have more
The
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Chapter 30 Solutions
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- Explain the differences observed in the Tg and Tm values for each pair of polymers: (a) polyester A and PET; (b) polyester A and nylon 6,6. (c) How would you expect the Tm value for Kevlar to compare with the Tm value for nylon 6,6? Explain your prediction.arrow_forwardA 5.00-mL aliquot of a solution that contains 3.05 ppm Ni2+ is treated with an appropriate excess of 2,3-quinoxalinedithiol and diluted to 50.0 mL. The molar absorptivity of a Ni2+- 2,3-quinoxalinedithiol solution at 510 nm is 5520 L mol-1 cm-1. What is the absorbance of the above diluted Ni2+- 2,3-quinoxalinedithiol solution at 510 nm in a 1.00-cm cell?arrow_forwardGive a single benefit for each polymerisation from carrying them out under a nitrogen atmosphere? (d) Of the two polymers produced (A and B) one had Mn = 12,000 and a polydispersity of 1.1 and one a Mn = 11, 200 and a polydispersity of 1.7. Identify which set of molecular weight parameters corresponds to which polystyrene sample.arrow_forward
- 8.For end-group analysis, 0.8632 g of a carboxyl terminated polybutadiene (CTPB) sample dissolved in 1:3 mixture of ethanol and toluene consumed 5.2 ml of 0.1240 N alcoholic potassium hydroxide solution in titration using phenolphthalein as the indicator. Calculate the molar mass of the polymer.arrow_forwardThe polyester can be mixed with additional phthalic anhydride (0.5 mole of phthalic anhydride for each mole of 1,2,3-propanetriol in the original polyester) to form a liquid resin. When this resin is heated, it forms a hard, insoluble thermosetting polyester called glyptal. Q.) Propose a structure for the repeat unit in glyptal.arrow_forwardA mixture containing compounds A and B in methylene chloride (CH2Cl2) was extracted in a separatory funnel containing aqueous HCl. Which compound migrates to the aqueous layer? Why?arrow_forward
- p-toluic acid is prepared from 3.42 grams of p-Bromotoluene. When p-Bromotoluene was mixed with dry ether, the mixture was warmed until the ether begins to boil (34.6 °C). When the reaction is almost complete, dry ice (3-4 mL in a beaker) was prepared and the mixture was poured into it. After some time, 5 mL of 6 N HCl was added. The solvent used for the recrystallization is 100 mL of 30% ethanol. The reaction equation is given on the figure. What is the actual yield? What is the theoretical yield? How many moles of p-toluic acid was produced?arrow_forwardPoly(n-butyl acrylate) has a lower Tg than poly(methyl methacrylate), because of:a) weaker intermolecular attractionsb) free volume effects due to the flexible side chainc) the stiffness of the side chain.arrow_forwardAn organic compound has a percent composition, 89.84 %C, 10.17 %H. This compound has an approximate boiling point of 152 °C at 757 mmHg. The IR spectrum of the neat thin film is shown below.arrow_forward
- . How many grams of adapalene 0.1 % (w/w) gel is required to make 90 grams of adapalene 0.025 % (w/w) gel?arrow_forwardCalculate the weight of salicylic acid (FW: 138.12) needed to generate 5.00 g of aspirin (FW:180.16), considering that recrystallisation has a 60% yieldarrow_forward1. A student wants to dry a solution of aniline in hexane. Which drying agent should he use for the task? Rationalize the choice. 2. If calcium oxide is used as a drying agent, what is obtained as a product? 3. Why is ill-advised to use P4O10 as drying agents for “wet” acetone?arrow_forward
- Organic ChemistryChemistryISBN:9781305580350Author:William H. Brown, Brent L. Iverson, Eric Anslyn, Christopher S. FootePublisher:Cengage Learning