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Polymerizations of ethylene and propylene initiated by milled metallic oxides. II. Characterizations of the mechanochemically produced polymers
Author(s) -
Murakami Shigeru,
Tabata Masayoshi,
Sohma Junkichi
Publication year - 1984
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.1984.070290127
Subject(s) - polyethylene , materials science , polymer , polymerization , monomer , gel permeation chromatography , polymer chemistry , ethylene , low density polyethylene , chemical engineering , coordination polymerization , organic chemistry , solution polymerization , composite material , chemistry , catalysis , engineering
Polyethylene was mechanochemically produced by milling of alumina powder at room temperature in the presence of ethylene monomer. Nearly 50% of the produced polyethylene was chemically bonded with the matrix of the alumina. The other 50% of the polymer was extracted by the organic solvents. The polyethylene extracted by the hot n ‐heptane was characterized as having a structure similar to that of the branched polyethylene of low density, and the toluene extracted polyethylene had a structure similar to that of the high density polyethylene. The molecular weights of the mechanochemically produced polyethylene were found to distribute from 10 2 to 10 6 by gel permeation chromatography. The weight average molecular weight was estimated as 260,000 after the 3 days milling. Mechanochemical polymerization of ethylene was also demonstrated by milling of silica in the presence of ethylene monomer. Polymerization of propylene by milling of alumina under propylene atmosphere was performed. The obtained polymer was found to be an atactic by IR measurement and the molecular weight of the extracted product was determined as ≃ 400 by the vapor pressure osmometer.