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

Author Question: Discuss the implications in MWD when the number average molecular weight and the weight average ... (Read 130 times)

madam-professor

  • Hero Member
  • *****
  • Posts: 584
on: Aug 19, 2018
Discuss the implications in MWD when the number average molecular weight and the weight average molecular weight are widely different.
 
  What will be an ideal response?

Question 2

What is the relationship between melt index and viscosity? Explain the relationship using microstructure concepts.
 
  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

rekilledagain

  • Sr. Member
  • ****
  • Posts: 337
Reply #1 on: Aug 19, 2018
Answer to Question 1

If all the polymers were the same length, the number and weight average molecular weights would be the same. Therefore, when the number and weight averages are vastly different, it implies that the molecular weights are also vastly different and that the MWD is wide.

Answer to Question 2

Melt index is a measure of a polymer's ability to flow through an orifice within a given time. Time through the orifice gives insight as to the chain length and structure. Viscosity also measures chain length and structure as an interaction between the measuring device and the viscous fluid.


madam-professor

  • Member
  • Posts: 584
Reply 2 on: Aug 19, 2018
Great answer, keep it coming :)

jordangronback

  • Member
  • Posts: 339
Reply 3 on: Yesterday
:D TYSM

« previous next »
 

Did you know?

Approximately 15–25% of recognized pregnancies end in miscarriage. However, many miscarriages often occur before a woman even knows she is pregnant.

Did you know?

There used to be a metric calendar, as well as metric clocks. The metric calendar, or "French Republican Calendar" divided the year into 12 months, but each month was divided into three 10-day weeks. Each day had 10 decimal hours. Each hour had 100 decimal minutes. Due to lack of popularity, the metric clocks and calendars were ended in 1795, three years after they had been first marketed.

Did you know?

All adverse reactions are commonly charted in red ink in the patient's record and usually are noted on the front of the chart. Failure to follow correct documentation procedures may result in malpractice lawsuits.

Did you know?

Nearly 31 million adults in America have a total cholesterol level that is more than 240 mg per dL.

Did you know?

More than one-third of adult Americans are obese. Diseases that kill the largest number of people annually, such as heart disease, cancer, diabetes, stroke, and hypertension, can be attributed to diet.

A revised animal phylogeny based on molecular data of SSU rRNA A revised animal phylogeny based on molecular data of SSU rRNA
Structural hierarchy in the molecular organization of cells Structural hierarchy in the molecular organization of cells
How to find the average value of a function How to find the average value of a function
Components of Weight Gain during Pregnancy Components of Weight Gain during Pregnancy
Mayan Number Mayan Number
Molecular biology assignment Molecular biology assignment
Video: Introduction to filtration - filtrate formation and composition

For a complete list of videos, visit our video library