Premium
Crystallization analysis fractionation: A new technique for the analysis of branching distribution in polyolefins
Author(s) -
Monrabal Benjamin
Publication year - 1994
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1994.070520403
Subject(s) - crystallization , fractionation , branching (polymer chemistry) , crystallinity , polypropylene , polymer , polyethylene , materials science , crystallization of polymers , linear low density polyethylene , polymer chemistry , chromatography , polymer science , chemical engineering , chemistry , composite material , organic chemistry , engineering
A new technique to analyze the short‐chain branching distribution (SCBD) in linear lowdensity polyethylene has been developed. The technique referred as crystallization analysis fractionation is based on a stepwise precipitation approach. By monitoring the polymer solution concentration during crystallization, the cumulative and differential SCBD can be obtained without the need of physical separation of fractions. The new technique has been shown to provide similar results to temperature rising elution fractionation but in a shorter time and with a simplified apparatus. It allows the simultaneous analysis of various samples and could also be used for analysis of polypropylene and other semicrystalline polymers that can be fractionated on the basis of crystallizability. © 1994 John Wiley & Sons, Inc.