A polymer sample combines five different molecular-weight fractions of equal weight. The molecular weights of these fractions increase from 20,000 to 100,000 in increments of 20,000. Calculate Mn and Mw.

Introduction to Chemical Engineering Thermodynamics
8th Edition
ISBN:9781259696527
Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Chapter1: Introduction
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Q1)
A polymer sample combines five different molecular-weight fractions of equal weight.
The molecular weights of these fractions increase from 20,000 to 100,000 in increments
of 20,000. Calculate Mn and Mw.
Q2)
Differentiate between initiator and catalyst. List the various stages in the free radical
polymerization.
Q3)
Describe the cationic mechanism of chain polymerization.
Q4)
Temperature and pressure have a profound effect in radical polymerization. Discuss?
Q5)
Give two examples of step growth polymerization reaction wherein there is no formation
of byproduct.
06)
In the manufacture of epoxy polymer, how is the molecular weight of the prepolymer
controlled?
Transcribed Image Text:Q1) A polymer sample combines five different molecular-weight fractions of equal weight. The molecular weights of these fractions increase from 20,000 to 100,000 in increments of 20,000. Calculate Mn and Mw. Q2) Differentiate between initiator and catalyst. List the various stages in the free radical polymerization. Q3) Describe the cationic mechanism of chain polymerization. Q4) Temperature and pressure have a profound effect in radical polymerization. Discuss? Q5) Give two examples of step growth polymerization reaction wherein there is no formation of byproduct. 06) In the manufacture of epoxy polymer, how is the molecular weight of the prepolymer controlled?
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