You are given a sample of polypropylene and wish to find out the volume % crystallinity. You know that the density of 100% crystalline polypropylene (ρc) is 0.946 g/cm3, and the density of 100% amorphous polypropylene (ρa) is 0.855 g/cm3. Through your careful measurements, you determine the density of the sample (ρs) is 0.93 g/cm3. Use the following equation to determine the volume % crystallinity (ν) of your sample. Enter your answer with 1 decimal place.Answer is 82.4Another sample of polypropylene has a 68 volume percent crystallinity. What is the density of the sample? Enter your answer is g/cm3. ( I need help with this second question. The answer is .917, i just can't get to that.) Hint: use the values and equation from the previous problem.

Question
Asked Feb 26, 2020
31 views

You are given a sample of polypropylene and wish to find out the volume % crystallinity. You know that the density of 100% crystalline polypropylene (ρc) is 0.946 g/cm3, and the density of 100% amorphous polypropylene (ρa) is 0.855 g/cm3. Through your careful measurements, you determine the density of the sample (ρs) is 0.93 g/cm3. Use the following equation to determine the volume % crystallinity (ν) of your sample. Enter your answer with 1 decimal place.

Answer is 82.4

Another sample of polypropylene has a 68 volume percent crystallinity. What is the density of the sample? Enter your answer is g/cm3. ( I need help with this second question. The answer is .917, i just can't get to that.)

 

Hint: use the values and equation from the previous problem.

 

check_circle

Expert Answer

Step 1

Given data,

Mechanical Engineering homework question answer, step 1, image 1

 

Step 2

The formula for volume percent crystallinity is –

Mechanical Engineering homework question answer, step 2, image 1

 

...

Want to see the full answer?

See Solution

Check out a sample Q&A here.

Want to see this answer and more?

Solutions are written by subject experts who are available 24/7. Questions are typically answered within 1 hour.*

See Solution
*Response times may vary by subject and question.

Related Mechanical Engineering Q&A

Find answers to questions asked by student like you
Show more Q&A
add
question_answer

Q: 11-110 In a one-shell and two-tube heat exchanger, cold water with inlet temperature of 20°C is heat...

A: Assume that the heat exchanger is completely insulated and the temperature variation occur in 1-D on...

question_answer

Q: I have three parts that I need answered pertaining to the print provided below.   Is the auxiliary v...

A: Note: We are authorized to answer one question at a time. Since you have asked three questions at ti...

question_answer

Q: 1.1 Determine the electrical power supplied to a boiler when the temperature of the enteringwater is...

A: Steady flow equatoin,

question_answer

Q: I need problem 8 answered pertaining to the print and sequence of operations that is both provided.

A: A pneumatic control system is designed in the form of pneumatic circuits. The pneumatic system mainl...

question_answer

Q: Question in pic below. Specifically a dynamics problem.

A: Consider the weight of the crate as W, and the two forces acting be F1 and F2. Draw the free body di...

question_answer

Q: Specifically a dynamics problem. Question in pic below.

A: Given: The initial velocity,v1 =-10 m/s The final velocity , v2 =20 m/s  The mass of puck, m = 0.2 k...

question_answer

Q: Specifically a dynamics problem: A particle travels along a straight line such that its position is ...

A: Click to see the answer

question_answer

Q: How does the stroke length of an air cylinder affect the force output of a cylinder?

A: Stroke length is defined as the distance which is travelled by the piston in the cylinder from top d...

question_answer

Q: Please find the question attached.

A: Click to see the answer