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Linear and nonlinear viscoelasticity of oleogels based on vegetable oil and ethylene vinyl acetate copolymer/isotactic polypropylene blends
Journal of applied polymer science, 2015-09, Vol.132 (34), p.np-n/a
Alfonso, Jose Enrique Martín
Valencia, Concepción
2015
Details
Autor(en) / Beteiligte
Alfonso, Jose Enrique Martín
Valencia, Concepción
Titel
Linear and nonlinear viscoelasticity of oleogels based on vegetable oil and ethylene vinyl acetate copolymer/isotactic polypropylene blends
Ist Teil von
Journal of applied polymer science, 2015-09, Vol.132 (34), p.np-n/a
Ort / Verlag
Hoboken: Blackwell Publishing Ltd
Erscheinungsjahr
2015
Link zum Volltext
Quelle
Wiley Online Library Journals Frontfile Complete
Beschreibungen/Notizen
ABSTRACT This work deals with a rheological study of oleogels based on high‐oleic sunflower oil (HOSO) and ethylene vinyl acetate copolymer (EVA) / isotactic polypropylene (iPP) blends. EVA copolymers with different vinyl acetate content were used. With this aim, linear small amplitude oscillatory shear (SAOS) and nonlinear (relaxation) measurements combined with polarized optical microscopy were carried out. Oleogels were prepared by using the mixing rheometry technique in a batch mixer. Oscillatory strain amplitude sweep tests showed that the end from the viscoelastic linear region for oleogels was accompanied by opposite trends for viscoelastic moduli. SAOS tests showed that all the oleogels present similar behavior characteristic of polymeric systems with physical entanglements. It was found that the elastic equilibrium modulus and loss tangent increases with iPP content. On the other hand, nonlinear relaxation tests presented a strong dependence on the strain applied and the Soskey–Winter model was found to provide an accurate description of the damping function of these oleogels. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015, 132, 42477.
Sprache
Englisch
Identifikatoren
ISSN: 0021-8995
eISSN: 1097-4628
DOI: 10.1002/app.42477
Titel-ID: cdi_proquest_miscellaneous_1701089703
Format
–
Schlagworte
Copolymers
,
Ethylene vinyl acetates
,
ethylene-vinyl acetate copolymer
,
Isotactic
,
linear viscoelasticity
,
Mathematical models
,
non-linear stress relaxation
,
Nonlinearity
,
oleogel
,
Polymer blends
,
Polypropylenes
,
vegetable oil
,
Viscoelasticity
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