Characterization and properties of polypropylene-block-poly(ethylene-co-propylene) synthesized by short-period polymerization

✍ Scribed by Koh-Hei Nitta; Takenori Kawada; Valery V. Prokhorov; Mikio Yamahiro; Hideharu Mori; Minoru Terano

• Publisher: John Wiley and Sons
• Year: 1999
• Tongue: English
• Weight: 202 KB
• Volume: 74
• Category: Article
• ISSN: 0021-8995
• DOI: 10.1002/(sici)1097-4628(19991024)74:4<958::aid-app22>3.0.co;2-7

✦ Synopsis

The morphology and mechanical properties of novel block copolymers consisting of isotactic polypropylene (PP) and ethylene-propylene rubber (EPR) synthesized by a short-period polymerization method were examined using differential scanning calorimetry, atomic force microscopy, dynamic mechanical analysis, and a rheooptical technique. It was found that the novel block copolymers show a single glass transition and EPR segments are trapped into the amorphous region of PP. Furthermore, the rheooptical analysis demonstrates that a drawing process of the EPR-rich block copolymer induces orientation of the PP lamellae in the EPR matrix.