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 110 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
:D TYSM

softEldritch

  • Member
  • Posts: 334
Reply 3 on: Yesterday
Gracias!

« previous next »
 

Did you know?

The use of salicylates dates back 2,500 years to Hippocrates’s recommendation of willow bark (from which a salicylate is derived) as an aid to the pains of childbirth. However, overdosage of salicylates can harm body fluids, electrolytes, the CNS, the GI tract, the ears, the lungs, the blood, the liver, and the kidneys and cause coma or death.

Did you know?

According to the FDA, adverse drug events harmed or killed approximately 1,200,000 people in the United States in the year 2015.

Did you know?

The toxic levels for lithium carbonate are close to the therapeutic levels. Signs of toxicity include fine hand tremor, polyuria, mild thirst, nausea, general discomfort, diarrhea, vomiting, drowsiness, muscular weakness, lack of coordination, ataxia, giddiness, tinnitus, and blurred vision.

Did you know?

Hyperthyroidism leads to an increased rate of metabolism and affects about 1% of women but only 0.1% of men. For most people, this increased metabolic rate causes the thyroid gland to become enlarged (known as a goiter).

Did you know?

The average office desk has 400 times more bacteria on it than a toilet.

A revised animal phylogeny based on molecular data of SSU rRNA A revised animal phylogeny based on molecular data of SSU rRNA
On average, the ratio of carbon to nitrogen is much higher in terrestrial plants than in other major On average, the ratio of carbon to nitrogen is much higher in terrestrial plants than in other major
The number of words correctly completed in the New York Times crossword puzzle increases with age ... The number of words correctly completed in the New York Times crossword puzzle increases with age ...
The molecular structures of isooctane (left) and octane (right) dictate the differing chemical and ... The molecular structures of isooctane (left) and octane (right) dictate the differing chemical and ...
The average weight gain between Thanksgiving and New Year's Day is about a pound The average weight gain between Thanksgiving and New Year's Day is about a pound
Recommended Weight Gain during Pregnancy Recommended Weight Gain during Pregnancy
Video: Methods of carbon dioxide transport - carbaminohemoglobin and bicarbonate ions

For a complete list of videos, visit our video library