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

Author Question: What is the origin of the variety in the properties of polyurethanes? What will be an ideal ... (Read 20 times)

Wadzanai

  • Hero Member
  • *****
  • Posts: 528
on: Aug 19, 2018
What is the origin of the variety in the properties of polyurethanes?
 
  What will be an ideal response?

Question 2

Discuss two methods that might be employed to make an epoxy resin tougher.
 
  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

karlss

  • Sr. Member
  • ****
  • Posts: 321
Reply #1 on: Aug 19, 2018
Answer to Question 1

The urethane bond is easily formed with little consequence of the groups that are between the active groups on the polymers. Therefore, a wide variety of structural shapes are possible for these groups. These groups determine the basic properties of the polyurethane and, therefore, give rise to the variability.

Answer to Question 2

One method would be to add a rubber toughener to the epoxy resin. Another method would be to change the nature of the epoxy so that it is more aliphatic and less aromatic.


Wadzanai

  • Member
  • Posts: 528
Reply 2 on: Aug 19, 2018
Great answer, keep it coming :)

amcvicar

  • Member
  • Posts: 341
Reply 3 on: Yesterday
YES! Correct, THANKS for helping me on my review

« previous next »
 

Did you know?

Intradermal injections are somewhat difficult to correctly administer because the skin layers are so thin that it is easy to accidentally punch through to the deeper subcutaneous layer.

Did you know?

Excessive alcohol use costs the country approximately $235 billion every year.

Did you know?

Thyroid conditions cause a higher risk of fibromyalgia and chronic fatigue syndrome.

Did you know?

Your skin wrinkles if you stay in the bathtub a long time because the outermost layer of skin (which consists of dead keratin) swells when it absorbs water. It is tightly attached to the skin below it, so it compensates for the increased area by wrinkling. This happens to the hands and feet because they have the thickest layer of dead keratin cells.

Did you know?

Children with strabismus (crossed eyes) can be treated. They are not able to outgrow this condition on their own, but with help, it can be more easily corrected at a younger age. It is important for infants to have eye examinations as early as possible in their development and then another at age 2 years.

Nonmetal Oxides and Their Properties Nonmetal Oxides and Their Properties
Modified Amino acids with unique properties Modified Amino acids with unique properties
A variety of sugar substitutes is available to the consumer A variety of sugar substitutes is available to the consumer
Eating a variety of foods from all food groups is the best strategy to meet your daily mineral needs Eating a variety of foods from all food groups is the best strategy to meet your daily mineral needs
The Nature and Properties of Soils, 15th Edition Cover The Nature and Properties of Soils, 15th Edition Cover
The origin and spread of modern H. sapiens, reconstructed from genetic and fossil evidence. The origin and spread of modern H. sapiens, reconstructed from genetic and fossil evidence.
Video: Cellular Defects - Osteoblasts, Osteoclasts and Osteocytes

For a complete list of videos, visit our video library