« previous next »

Author Question: Discuss the physical factors in a plastic that affect permeability. What will be an ideal ... (Read 149 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?

Throughout history, plants containing cardiac steroids have been used as heart drugs and as poisons (e.g., in arrows used in combat), emetics, and diuretics.

Did you know?

Before a vaccine is licensed in the USA, the Food and Drug Administration (FDA) reviews it for safety and effectiveness. The CDC then reviews all studies again, as well as the American Academy of Pediatrics and the American Academy of Family Physicians. Every lot of vaccine is tested before administration to the public, and the FDA regularly inspects vaccine manufacturers' facilities.

Did you know?

Fatal fungal infections may be able to resist newer antifungal drugs. Globally, fungal infections are often fatal due to the lack of access to multiple antifungals, which may be required to be utilized in combination. Single antifungals may not be enough to stop a fungal infection from causing the death of a patient.

Did you know?

Prostaglandins were first isolated from human semen in Sweden in the 1930s. They were so named because the researcher thought that they came from the prostate gland. In fact, prostaglandins exist and are synthesized in almost every cell of the body.

Did you know?

Every 10 seconds, a person in the United States goes to the emergency room complaining of head pain. About 1.2 million visits are for acute migraine attacks.

Physical assessment is one component of the nursing database Physical assessment is one component of the nursing database
Body Part, Method of Examination, and Equipment Used During the General Physical Examination Cont. Body Part, Method of Examination, and Equipment Used During the General Physical Examination Cont.
Conditions Treated by Physical Therapy Cont Conditions Treated by Physical Therapy Cont
Major regulatory factors controlling pyruvate dehydrogenase and the citric acid cycle Major regulatory factors controlling pyruvate dehydrogenase and the citric acid cycle
The relationship between recombination frequency and physical distance between genes The relationship between recombination frequency and physical distance between genes
Video: Properties of water -structure of water and polarity (Ionized and polar compounds)

For a complete list of videos, visit our video library