Characterization of microstructure of polypropylene alloys

✍ Scribed by Xu, Junting; Feng, Linxian

• Publisher: John Wiley and Sons
• Year: 1998
• Tongue: English
• Weight: 91 KB
• Volume: 47
• Category: Article
• ISSN: 0959-8103
• DOI: 10.1002/(sici)1097-0126(199812)47:4<433::aid-pi79>3.0.co;2-z

✦ Synopsis

Two polypropylene (PP) alloys, which have similar composition, molecular weight and molecular weight distribution, but di †erent processing and application properties, were fractionated using a preparative temperature rising elution fractionation (TREF) technique. It was found that PP alloys are mainly composed of four components : ethyleneÈpropylene random copolymer, block-type copolymer, transition copolymer and propylene homopolymer. However, the fractionation data show that the distribution and the composition are di †erent for these two samples. A possible mechanism is proposed for the formation of PP alloys of di †erent compositions. Based on this mechanism, some possible adjustment of the polymerization parameters is suggested to control the microstructure.