« previous next »

Author Question: Discuss the physical factors in a plastic that affect permeability. What will be an ideal ... (Read 164 times)

mynx

  • Hero Member
  • *****
  • Posts: 555
on: Aug 19, 2018
Discuss the physical factors in a plastic that affect permeability.
 
  What will be an ideal response?

Question 2

You are molding a toy bridge (6 inches high with a 24 inch span) that is failing (bending) when kids step on the span. The part is currently made of a plastic with a melt index of 10 and a density of 0.94 . The market is highly competitive, so ideal solutions should take cost into account. Indicate 4 possible methods of solving the problem, and then choose one of the methods and defend your choice.
 
  What will be an ideal response?


ntsoane kedibone

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

The tightness or denseness of the polymer structure is one of the most important physical factors affecting permeability. Therefore, crystallinity reduces permeability. Likewise, crosslinking reduces permeability. Other factors affecting permeability would be the similarity of chemical natures between the polymer and the gas passing through. If these are similar, permeability is increased. Other factors affecting permeability include temperature (increases permeability) and size of the permeating molecules

Answer to Question 2

Possible answers include thickening the bridge in key areas, finding a material with higher melt index or higher density, or even using mold-in supports. Answer should also include a valid discussion of the chosen solution.


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question

mynx

  • Hero Member
  • *****
  • Posts: 555
Reply #2 on: Aug 19, 2018
TY


ntsoane kedibone

  • Sr. Member
  • ****
  • Posts: 333
Reply #3 on: Aug 19, 2018
You're welcome


« previous next »
 

Did you know?

Malaria mortality rates are falling. Increased malaria prevention and control measures have greatly improved these rates. Since 2000, malaria mortality rates have fallen globally by 60% among all age groups, and by 65% among children under age 5.

Did you know?

Drug abusers experience the following scenario: The pleasure given by their drug (or drugs) of choice is so strong that it is difficult to eradicate even after years of staying away from the substances involved. Certain triggers may cause a drug abuser to relapse. Research shows that long-term drug abuse results in significant changes in brain function that persist long after an individual stops using drugs. It is most important to realize that the same is true of not just illegal substances but alcohol and tobacco as well.

Did you know?

Illicit drug use costs the United States approximately $181 billion every year.

Did you know?

Coca-Cola originally used coca leaves and caffeine from the African kola nut. It was advertised as a therapeutic agent and "pickerupper." Eventually, its formulation was changed, and the coca leaves were removed because of the effects of regulation on cocaine-related products.

Did you know?

About 3.2 billion people, nearly half the world population, are at risk for malaria. In 2015, there are about 214 million malaria cases and an estimated 438,000 malaria deaths.

Influence of abiotic factors on competition between T. castaneum and T. confusum. Influence of abiotic factors on competition between T. castaneum and T. confusum.
Physical Fitness and Cancer Risk Physical Fitness and Cancer Risk
A plastic mock-up of a Honda VTEC system that uses two different camshaft profiles: one for low ... A plastic mock-up of a Honda VTEC system that uses two different camshaft profiles: one for low ...
Major Risk Factors for Hypertension Major Risk Factors for Hypertension
Different bodies of water have contrasting physical properties Different bodies of water have contrasting physical properties
Primary factors affecting blood pressure Primary factors affecting blood pressure
Video: Parkinson's Disease

For a complete list of videos, visit our video library