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

Author Question: What are the key polymeric structural features common to most elastomeric materials? What will be ... (Read 71 times)

chads108

  • Hero Member
  • *****
  • Posts: 507
on: Aug 19, 2018
What are the key polymeric structural features common to most elastomeric materials?
 
  What will be an ideal response?

Question 2

Two crosslinkable polyesters are being considered for use as the resin in making a fiberglass-reinforced tank for processing various chemicals. One polyester is made from a glycol having four carbons between the alcohol groups and the other is made using the same acid but from a glycol having eight carbons between the alcohols. Compare the physical, chemical, and mechanical properties of the two resins. If the chemicals being processed are water-based, which resin is the best candidate on the basis of chemical resistance?
 
  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

leahm14

  • Sr. Member
  • ****
  • Posts: 322
Reply #1 on: Aug 19, 2018
Answer to Question 1

Elastomers are generally linear, aliphatic materials with structures that do not pack together easily and are therefore noncrystalline. These materials have highly random structures in their relaxed state but will become more ordered if stretched.

Answer to Question 2

The material containing the four carbons will have a higher crosslinked density and as such will have a higher shrinkage and stiffness and resistance to chemicals than the material containing the eight carbon bonds. For the same reasons as mentioned, the four carbon bonded polyester will have a better resistance to the water-based chemicals.


chads108

  • Hero Member
  • *****
  • Posts: 507
Reply #2 on: Aug 19, 2018
Thank you!


leahm14

  • Sr. Member
  • ****
  • Posts: 322
Reply #3 on: Aug 19, 2018
Always glad to help...


« previous next »
 

Did you know?

Side effects from substance abuse include nausea, dehydration, reduced productivitiy, and dependence. Though these effects usually worsen over time, the constant need for the substance often overcomes rational thinking.

Did you know?

The familiar sounds of your heart are made by the heart's valves as they open and close.

Did you know?

Asthma occurs in one in 11 children and in one in 12 adults. African Americans and Latinos have a higher risk for developing asthma than other groups.

Did you know?

Dogs have been used in studies to detect various cancers in human subjects. They have been trained to sniff breath samples from humans that were collected by having them breathe into special tubes. These people included 55 lung cancer patients, 31 breast cancer patients, and 83 cancer-free patients. The dogs detected 54 of the 55 lung cancer patients as having cancer, detected 28 of the 31 breast cancer patients, and gave only three false-positive results (detecting cancer in people who didn't have it).

Did you know?

No drugs are available to relieve parathyroid disease. Parathyroid disease is caused by a parathyroid tumor, and it needs to be removed by surgery.

Martian geological features, such as the "Face on Mars", sometimes trigger facial pareidol Martian geological features, such as the "Face on Mars", sometimes trigger facial pareidol
Retrograde pyelogram. A contrast medium is injected into the ureter using a cystoscope, and the X-ra Retrograde pyelogram. A contrast medium is injected into the ureter using a cystoscope, and the X-ra
Surface Features on Titan Surface Features on Titan
Adenosine triphosphate (ATP) is the most common molecule used by cells to captur Adenosine triphosphate (ATP) is the most common molecule used by cells to captur
Common skin signs are often evidence of an illness or disorder. A vesicle is a small fluid filled ... Common skin signs are often evidence of an illness or disorder. A vesicle is a small fluid filled ...
Structural MRIs reveal thinning of sensorimotor cortex in children with Tourette syndrome. Red and ... Structural MRIs reveal thinning of sensorimotor cortex in children with Tourette syndrome. Red and ...
Video: Bone elongation - processes at the epiphyseal plate

For a complete list of videos, visit our video library