NDLI: Transient shear and elongational behavior of blends of PET with a LCP

Content Provider	Springer Nature Link
Author	Silva, Lucineide Balbi da Ueki, Marcelo Massayoshi Farah, Marcelo Barroso, Vitor Manuel Coelho Maia, João Manuel Luis Lopes Bretas, Rosario Elida Suman
Copyright Year	2005
Abstract	Blends of polyethylene terephthalate (PET) with a liquid crystalline polymer (LCP) and a compatibilizer were produced by twin screw extrusion and injection molding. Transesterification and compatibilization studies were made in a torque rheometer. The morphology of the injection-molded plaques was studied by scanning electron microscopy. The blends shear growth function $$(\eta ^{+} (t,\dot\.{\gamma}))$$ was measured in a cone and plate rheometer. The elongational growth function $$(\bar\={\eta}^{+} (\dot\.{\varepsilon},t))$$ was measured in a modified rotational rheometer. Transesterification was observed in the PET/LCP/compatibilizer 95/5/0 blend. The injection-molded plaques displayed the usual “skin-core” morphology. All the blends were highly shear-thinning, even at low shear rates; thus, a zero-shear viscosity could not be calculated. The compatibilized blend had the highest shear viscosity of all the blends, confirming the strong PET/LCP interphase and the effectiveness of the compatibilizing agent. On the other hand, the 90/10/0 blend had the lowest shear viscosity. All the blends showed strain softening behavior, similar to the PET. The 90/10/0 blend had the highest elongational growth function, while the 95/5/0 had the lowest. The compatibilized blend had an intermediate behavior between both blends.
Starting Page	268
Ending Page	280
Page Count	13
File Format	PDF
ISSN	00354511
Journal	Rheologica Acta
Volume Number	45
Issue Number	3
e-ISSN	14351528
Language	English
Publisher	Springer-Verlag
Publisher Date	2005-09-16
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Liquid crystalline polymer Poly(ethylene terephthalate) Blends Elongational viscosity Shear viscosity Food Science Soft Matter, Complex Fluids Mechanical Engineering Polymer Sciences Characterization and Evaluation of Materials
Content Type	Text
Resource Type	Article
Subject	Mechanics of Materials Condensed Matter Physics Materials Science

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