Constitutive relationships for the mechanical properties of anisotropic, partially crystalline polymers

A method for PET mechanical properties enhancement by reactive blending with HBA/HNA Liquid Crystalline Polymers for in situ highly fibrillar composites preparation is presented. LCP/PET blends were reactively extruded in presence of Pyromellitic Di-Anhydride (PMDA) and then characterized by Differential Scanning Calorimetry, Thermally Stimulated Currents and tensile mechanical properties. Moderate amounts of LCP in the PET (0.5 and 5%) and small amounts of thermo-active and reactive compatibilizer in the blend (0.3%) were found to significantly improve LCP melt dispersion, melts shear transfer and LCP fibril formation and adhesion. An unexpected improvement was probably due to the presence of two distinct phases’ supra-molecular structures involving PET-LCP and PMDA.

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Study of the Processing and Mechanical Properties ofIn SituComposite Materials of Thermoplastics with Thermotropic Liquid Crystalline Polymers

Polymer-Plastics Technology and Engineering ◽

10.1080/03602559408010739 ◽

1994 ◽

Vol 33 (4) ◽

pp. 445-455 ◽

Cited By ~ 4

Author(s):

Fang Shi

Keyword(s):

Mechanical Properties ◽

Liquid Crystalline ◽

Liquid Crystalline Polymers ◽

Crystalline Polymers ◽

Thermotropic Liquid Crystalline Polymers

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Coupling of optical and mechanical properties in crystalline polymers

Polymer Engineering & Science ◽

10.1002/pen.760191405 ◽

1979 ◽

Vol 19 (14) ◽

pp. 975-994 ◽

Cited By ~ 56

Author(s):

James C. Seferis ◽

Robert J. Samuels

Keyword(s):

Mechanical Properties ◽

Crystalline Polymers ◽

Optical And Mechanical Properties

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Morphology and mechanical properties of crystalline polymers. II. Spherulitic polyethylene

Journal of Applied Physics ◽

10.1063/1.1662894 ◽

1973 ◽

Vol 44 (9) ◽

pp. 4052-4057 ◽

Cited By ~ 13

Author(s):

Tsuey T. Wang

Keyword(s):

Mechanical Properties ◽

Crystalline Polymers ◽

Morphology And Mechanical Properties

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Morphology and mechanical properties of polyamide 12 (PA12)/poly(vinylidene fluoride) (PVDF) blends

Polish Journal of Chemical Technology ◽

10.2478/v10026-009-0032-z ◽

2009 ◽

Vol 11 (3) ◽

pp. 27-34 ◽

Cited By ~ 1

Author(s):

Aleksandra Ratajska ◽

Wojciech Kulak ◽

Artur Poeppel ◽

Andreas Seyler ◽

Zbigniew Roslaniec

Keyword(s):

Mechanical Properties ◽

Vinylidene Fluoride ◽

Polymeric Materials ◽

Scanning Calorimetry ◽

Crystalline Polymers ◽

Polyamide 12 ◽

Poly Vinylidene Fluoride ◽

Static Tensile ◽

Internal Mixer ◽

Morphology And Mechanical Properties

Morphology and mechanical properties of polyamide 12 (PA12)/poly(vinylidene fluoride) (PVDF) blends The morphology, thermal and mechanical properties of polyamide 12 (PA12)/poly(vinylidene fluoride) (PVDF) blends were investigated. These polymers are engineering, semi-crystalline polymers which are reciprocally immiscible. Differential scanning calorimetry (DSC), dynamic mechanical thermal analysis (DMTA) and scanning electron microscopy (SEM) were used to characterize the polymeric materials. Mechanical properties were examined by static tensile test. The investigations demonstrate that blends with higher amount of PVDF, with the morphology of two co-continuous semicristalline phases, exhibit better mechanical properties. The blends with small content of PVDF and prepared by extrusion show the morphology of small separated domains of PVDF and full continuous PA phase. The morphology of these blends is different than the blends prepared by internal mixer and have better mechanical properties too. Thus they can be used in particular applications without a compatibilizing agent.

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