Mn is the number average molecular weight. This corresponds to the "true average" or mean; that is, the sum of the molecular weights divided by the number of molecules. Mw is the weight average molecular weight. This corresponds to the median value; that is, there are as many molecules smaller than the weight average molecular weight as there are larger than the weight average molecular weight. The fact that the two molecular weight values are so different means that there is a large, non-symmetrical distribution of molecular weights; the largest molecules probably have a molecular weight of several million.
P3143
Poly(ethyleneimine) solution
analytical standard, 50 % (w/v) in H2O
Synonym(s):
Ethyleneimine polymer solution, PEI
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100 ML
€91.10
500 ML
€265.00
1 L
€485.00
About This Item
Recommended Products
grade
analytical standard
Quality Level
mol wt
Mn ~60,000
Mw 750,000
concentration
50 % (w/v) in H2O
technique(s)
gel permeation chromatography (GPC): suitable
format
single component solution
SMILES string
N1CC1
InChI
1S/C2H5N/c1-2-3-1/h3H,1-2H2
InChI key
NOWKCMXCCJGMRR-UHFFFAOYSA-N
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Application
Poly(ethyleneimine) is a water soluble polymer used as a membrane lubricant for filtering frozen cell membranes. PEI cellulose in small columns will separate cyclic nucleotides from related compounds at the same electrolyte concentration that is used for thin layer chromatography on PEI cellulose-coated plates. PEI solution may also be used in the synthesis of a nanofibrous membrane, which may be used in the adsorption of anionic dyes and heavy metal ions from wastewater samples.[1]
Signal Word
Warning
Hazard Statements
Precautionary Statements
Hazard Classifications
Acute Tox. 4 Oral - Aquatic Chronic 2 - Eye Irrit. 2 - Skin Sens. 1
Storage Class Code
10 - Combustible liquids
WGK
WGK 2
Flash Point(F)
Not applicable
Flash Point(C)
Not applicable
Personal Protective Equipment
dust mask type N95 (US), Eyeshields, Gloves
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The product description of Product P3143, Poly(ethyleneimine) solution, on sigmaaldrich.com appears to give two molecular weight values, Mn and Mw. What do those abbreviations stand for, and why are the two values so different?
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