
Introduction to the Materials Science of Polymers
Penn State University
![]() PC Painter and MM Coleman Fundamentals of Polymer Science (2nd Edition, CRC Press) |
Chapter 3
Concepts that you must know:- What is "Flory's Assumption"?
- Definitions: reaction rate, rate constant, and concentrations of reactants. How do they relate with each-other ?
- Step-Growth kinetics: extend of reaction (p), concentration of molecules vs. concentration of functional groups, time-dependence of reaction (eq. 3.9). Go through Exercise 1 below.
- Free Radical kinetics: definitions of four stages/mechanisms (initiation, propagation, termination, and chain transfer), conversion, steady-state assumption. Go through Exercise 2 below.
- Free Radical kinetics: what is kinetic chain length, calculate the kinetic chain length (eq. 3.36, 3.37), understand how it relates to the instantaneous and the average molecular weight of the produced polymer
- Effect of Chain Transfer phenomena on the molecular weight (eq. 3.44, 3.45)
- * Go through the calculation of step-growth kinetics (pg. 65-68), make sure that you understand equation 3.8
- * Go through the calculation of free radical kinetics (pg. 69-77), make sure that you understand steady state assumption and kinetic chain length