This topic contains a solution. Click here to go to the answer
« previous next »

Author Question: Explain why a rubber washer stops sealing tightly after several years. What will be an ideal ... (Read 46 times)

dbose

  • Hero Member
  • *****
  • Posts: 597
on: Aug 19, 2018
Explain why a rubber washer stops sealing tightly after several years.
 
  What will be an ideal response?

Question 2

Why would fluorocarbon elastomers be so effective in resisting solvents?
 
  What will be an ideal response?


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

srodz

  • Sr. Member
  • ****
  • Posts: 333
Reply #1 on: Aug 19, 2018
Answer to Question 1

Over time the rubber is going to continue to crosslink and become harder which will not be as compliant with the other surface. This will also cause it to become more brittle and eventually break. It could also degrade.

Answer to Question 2

As with fluorocarbon molding resins, the presence of fluorine in the elastomer reduces all chemical activity, including solvation effects. This occurs because of the strength of the carbon-fluorine bond and the tightness with which the fluorine electrons are held. These tightly held electrons and the strong, short carbon-fluorine bond mean that the fluorocarbon molecules are repellent to attack from other atoms or molecules. Hence, their solvent resistance is extremely high.


dbose

  • Member
  • Posts: 597
Reply 2 on: Aug 19, 2018
Thanks for the timely response, appreciate it

abro1885

  • Member
  • Posts: 337
Reply 3 on: Yesterday
YES! Correct, THANKS for helping me on my review

« previous next »
 

Did you know?

The people with the highest levels of LDL are Mexican American males and non-Hispanic black females.

Did you know?

Women are two-thirds more likely than men to develop irritable bowel syndrome. This may be attributable to hormonal changes related to their menstrual cycles.

Did you know?

Thyroid conditions may make getting pregnant impossible.

Did you know?

Though the United States has largely rejected the metric system, it is used for currency, as in 100 pennies = 1 dollar. Previously, the British currency system was used, with measurements such as 12 pence to the shilling, and 20 shillings to the pound.

Did you know?

In the United States, congenital cytomegalovirus causes one child to become disabled almost every hour. CMV is the leading preventable viral cause of development disability in newborns. These disabilities include hearing or vision loss, and cerebral palsy.

Look at Table 4.2.2. Consumers learn that the rubber ducks wear out batteries quickly. As a ... Look at Table 4.2.2. Consumers learn that the rubber ducks wear out batteries quickly. As a ...
If CP for an ideal gas is 35.4 J/molK, which of the following is CV for this gas? If CP for an ideal gas is 35.4 J/molK, which of the following is CV for this gas?
Population age 65 and over and age 85 and over, selected years 1900-2008 and projected 2010-2050. Population age 65 and over and age 85 and over, selected years 1900-2008 and projected 2010-2050.
Americium-243 has a decay constant of 9.39 × 10-5 years-1. How long will it take Americium-243 has a decay constant of 9.39 × 10-5 years-1. How long will it take
For the circuit in Figure 1, assume ideal diodes. The peak inverse voltage is approximately For the circuit in Figure 1, assume ideal diodes. The peak inverse voltage is approximately
Heart drawing by 6 years old Heart drawing by 6 years old
Video: Atrophy

For a complete list of videos, visit our video library