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 48 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
YES! Correct, THANKS for helping me on my review

ttt030911

  • Member
  • Posts: 315
Reply 3 on: Yesterday
Wow, this really help

« previous next »
 

Did you know?

Symptoms of kidney problems include a loss of appetite, back pain (which may be sudden and intense), chills, abdominal pain, fluid retention, nausea, the urge to urinate, vomiting, and fever.

Did you know?

Studies show that systolic blood pressure can be significantly lowered by taking statins. In fact, the higher the patient's baseline blood pressure, the greater the effect of statins on his or her blood pressure.

Did you know?

The most common childhood diseases include croup, chickenpox, ear infections, flu, pneumonia, ringworm, respiratory syncytial virus, scabies, head lice, and asthma.

Did you know?

Disorders that may affect pharmacodynamics include genetic mutations, malnutrition, thyrotoxicosis, myasthenia gravis, Parkinson's disease, and certain forms of insulin-resistant diabetes mellitus.

Did you know?

Walt Disney helped combat malaria by making an animated film in 1943 called The Winged Scourge. This short film starred the seven dwarfs and taught children that mosquitos transmit malaria, which is a very bad disease. It advocated the killing of mosquitos to stop the disease.

The molecular basis of genetic complementation The molecular basis of genetic complementation
Average Global Temperature during the Phanerozoic Average Global Temperature during the Phanerozoic
Norman Bel Geddes, with Dr. Otto Koller, Air Liner Number 4. Norman Bel Geddes, with Dr. Otto Koller, Air Liner Number 4.
The Location and Number of Farms in the United States, 2012 The Location and Number of Farms in the United States, 2012
The Location and Number of Food- and Beverage-Processing Facilities The Location and Number of Food- and Beverage-Processing Facilities
Overallocation of Labor to Farming When Farmworkers Are Paid Their Average Product Overallocation of Labor to Farming When Farmworkers Are Paid Their Average Product
Video: Acid-base imbalances - respiratory acidosis and alkalosis

For a complete list of videos, visit our video library