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Explanation of tackifier effect on the viscoelastic properties of polyolefin‐based pressure sensitive adhesives
Author(s) -
Yuan Bing,
McGlinchey Chris,
Pearce Eli M.
Publication year - 2005
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.22820
Subject(s) - polyolefin , viscoelasticity , materials science , plateau (mathematics) , glass transition , shear modulus , thermodynamics , composite material , adhesive , viscosity , relaxation (psychology) , modulus , dynamic mechanical analysis , polymer , polymer chemistry , mathematics , psychology , mathematical analysis , social psychology , physics , layer (electronics)
The effects of three tackifiers on the glass transition temperature, terminal relaxation time, plateau modulus, and steady shear viscosity of polyolefin‐based pressure‐sensitive adhesives (PSAs) were investigated. Free volume theory and the Gordon‐Taylor equation are used to explain the special effects of tackifiers on the glass transition temperature of the PSA systems. The plateau modulus and zero shear viscosities were determined from which entanglements and monomeric friction coefficients were calculated. The terminal relaxation time (related to the whole molecular chain relaxations) was calculated from the plateau modulus and zero shear viscosity. Explanations were offered as to why tackifiers have “paradoxical” effects on the viscoelastic properties of the polyolefin‐based PSA, such as increasing the glass transition temperature but decreasing the plateau modulus of the base polymer. © 2005 Wiley Periodicals, Inc. J Appl Polym Sci, 2006