« previous next »

Author Question: Discuss the physical factors in a plastic that affect permeability. What will be an ideal ... (Read 147 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?

Although not all of the following muscle groups are commonly used, intramuscular injections may be given into the abdominals, biceps, calves, deltoids, gluteals, laterals, pectorals, quadriceps, trapezoids, and triceps.

Did you know?

About 80% of major fungal systemic infections are due to Candida albicans. Another form, Candida peritonitis, occurs most often in postoperative patients. A rare disease, Candida meningitis, may follow leukemia, kidney transplant, other immunosuppressed factors, or when suffering from Candida septicemia.

Did you know?

The term pharmacology is derived from the Greek words pharmakon("claim, medicine, poison, or remedy") and logos ("study").

Did you know?

There are more nerve cells in one human brain than there are stars in the Milky Way.

Did you know?

Serum cholesterol testing in adults is recommended every 1 to 5 years. People with diabetes and a family history of high cholesterol should be tested even more frequently.

Interaction web of factors that might influence locust population size. Interaction web of factors that might influence locust population size.
Child with cerebral palsy has abnormal muscle tone and lack of physical coordination. Child with cerebral palsy has abnormal muscle tone and lack of physical coordination.
Primary factors affecting blood pressure Primary factors affecting blood pressure
The primary factors affecting blood pressure. The primary factors affecting blood pressure.
Shutoff valves must be used on vehicles equipped with plastic fuel lines to isolate the cause of a ... Shutoff valves must be used on vehicles equipped with plastic fuel lines to isolate the cause of a ...
Conversion factors derivation. Conversion factors derivation.
Video: Monohybrid crosses

For a complete list of videos, visit our video library