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Rheological and thermal properties of blends of low‐density polyethylene and its ionomers
Author(s) -
Horrion J.,
Agarwal P. K.
Publication year - 1996
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.10583
Subject(s) - vicat softening point , materials science , miscibility , rheology , polyethylene , isothermal process , copolymer , ethylene oxide , polymer blend , softening , polymer chemistry , softening point , composite material , thermodynamics , polymer , physics
Abstract Melt rheology and DSC studies of blends of two ionomers′ ethylene‐acrylic acid copolymers are reported, EAA (4.6 mole % AA) and EAA (6.5), as a function of their concentration and counter ion types with their precursor, a low‐density polyethylene. Various isothermal dynamic measurements in the frequency range of 0.01 to 10 rad/sec, from 120 to 200°C, were made; and partial master curves of G ′ and G ″ were generated. Although the melts appeared to follow the conventional superposition principle, the Cole‐Cole plots were found to be unsatisfactory in describing the miscibility of such blends. The analysis based on the calculations of activation energies and other supporting measurements such as Vicat softening and DSC thermal analysis indicate that such blends are immiscible and perhaps do not have LCST. The blends failed to follow the additivity rule. The Vicat softening measurements indicated variations in the morphology of blends. The DSC studies performed on various 50/50 blends clearly demonstrated phase immiscibility.