Abstract
A study was made of the viscosities of polyalkylacrylate (PA) and polyalkylmethacrylate (PMA) melts containing 4 to 18 carbon atoms in the side chain. It was shown that with an increase in the length of side branches, viscosity and any anomaly in viscosity in homologous series markedly decreases, the viscosity of polymers with the same side radical being higher for PMA, compared with PA. The activation energy of viscous flow E decreases with an increase in the length of the side radical. The maximum corresponds to the first members of the series—polymethylmethacrylate and polymethylacrylate. The value of E for polymers with long alkyl side radicals is equal to the value of E of polypropylene, in contrast to the poly-α-olefin series, for which E corresponds to E of linear polyethylene for higher homologues. It was found that PA and PMA with long side branches capable of being crystallized may flow at temperatures somewhat lower than melting point. The formation of discontinuities is a typical feature of flow curves in this case. It was shown that the formation of this discontinuity is due to the breakdown of crystalline structure of the polymer.
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