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Novel Olefin Block Copolymer, Polypropene‐ block ‐poly(methylene‐1,3‐cyclopentane‐ co ‐propene), Synthesized from Propene and 1,5‐Hexadiene by a Modified Stopped‐Flow Method
Author(s) -
Kono Hiroyuki,
Mori Hideharu,
Terano Minoru
Publication year - 2001
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/1521-3935(20010501)202:8<1319::aid-macp1319>3.0.co;2-m
Subject(s) - copolymer , polymer chemistry , propene , cyclopentane , polymerization , chemistry , molar mass distribution , materials science , catalysis , polymer , organic chemistry
A block copolymer of propene and 1,5‐hexadiene, polypropene‐ block ‐poly(methylene‐1,3‐cyclopentane‐ co ‐propene) (PP‐ b ‐(PMCP‐ co ‐PP)), was synthesized using a modified stopped‐flow polymerization method with an MgCl 2 ‐supported Ziegler catalyst. Regarding the basic characteristics of the PP‐ b ‐(PMCP‐ co ‐PP), the block formation was investigated in detail. The obtained block copolymer showed a unimodal GPC curve without any peak in the low molecular weight region. It was also clear that the molecular weight of each part could be controlled by changing the polymerization time (from about 0.1 to 0.2 s). Furthermore, the elution pattern by temperature‐rising elution fractionation clearly showed that the block copolymer eluted in each temperature region between 20°C to 120°C was mainly composed of a unified component. Even after extraction with boiling heptane, the 13 C NMR spectra of the block copolymer showed that the signals from PMCP‐ co ‐PP remained unchanged, but disappeared in the blend of polypropene and PMCP‐ co ‐PP. The differential scanning calorimetry results and optical microscopic observations indicated not only the formation of a block copolymer having a chemical linkage between polypropene and PMCP‐ co ‐PP, but also the regulation of the crystalline distribution in the block copolymer by changing the composition of each block part.