M ()l 0 c:1,r.1r1:r* _
Ws-e i gins 0 f P0 1y In. (3-: r. as
Pure- low-molecular-weight organic compounds, such as sucrose, and some.
polymers, such as proteins, are monodisperse; i.e., all the molecules in any
sample of pure material have identical molecu
tend to crystallize as they precipitate or
are cooled from a melt.
Acting to inhibit crystallization are that polymers
are large molecules. Complicated and irregular
shapes prevent efficient packing
Molecular weight determination
Number Average and Weight Average Molecular Weight
A. The molecular weight of polymers
a. Some natural polymer (monodisperse) :
All polymer molecules have same molecular weights.
b. Synthetic polymers (polydisperse) :
Types of Polymerization methods
or mass polymerization
Bulk polymerization or mass po
CH3201: Polymer Science and Technology
(Due on January 25, 2015, late submissions will not be counted towards grades)
1. Consider three hypothetical monodisperse polymers, with M=10,000, M=100,000, and
M=1,000,000. For each, calculateMn andMw