In the present publication, a method to identify and distinguish betwe
en different types of low-density polyethylene based on thermal fracti
onation and FTIR analysis is described. It was shown that during therm
al fractionation four to seven endothermic peaks are obtained as oppos
ed to one or two peaks obtained during regular differential scanning c
alorimetric analysis. The ratio between band heights at 1368 and 1376
cm(-1) was found to represent the length of the side chain (branch). (
C) 1996 John Wiley & Sons, Inc.