Rheological properties and morphological evolutions of polypropylene/ethylene‐butene copolymer blends

Zhang, Xianming; Li, Hao; Li, Feng

doi:10.1002/pen.23116

Cited by 9 publications

(8 citation statements)

References 44 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For the linear viscoelastic envelope, the extensional viscosity is found as ). The linear viscoelastic prediction (LVE) for each material is also provided follows (Bird 1976;Zhang et al 2012):…”

Section: Methodsmentioning

confidence: 99%

Towards a universal shear correction factor in filament stretching rheometry

et al. 2021

View full text Add to dashboard Cite

Filament stretching rheometry is a prominent experimental method to determine rheological properties in extensional flow whereby the separating plates determine the extension rate. In literature, several correction factors that can compensate for the errors introduced by the shear contribution near the plates have been introduced and validated in the linear viscoelastic regime. In this work, a systematic analysis is conducted to determine if a material-independent correction factor can be found for non-linear viscoelastic polymers. To this end, a finite element model is presented to describe the flow and resulting stresses in the filament stretching rheometer. The model incorporates non-linear viscoelasticity and a radius-based controller for the plate speed is added to mimic the typical extensional flow in filament stretching rheometry. The model is validated by comparing force simulations with analytical solutions. The effects of the end-plates on the extensional flow and resulting force measurements are investigated, and a modification of the shear correction factor is proposed for the non-linear viscoelastic flow regime. This shows good agreement with simulations performed at multiple initial aspect ratios and strain rates and is shown to be valid for a range of polymers with non-linear rheological behaviour.

show abstract

Section: Methodsmentioning

confidence: 99%

Towards a universal shear correction factor in filament stretching rheometry

et al. 2021

View full text Add to dashboard Cite

show abstract

“…40ðK11Þ 3 11/ 5ð19K116Þ 4ðK11Þð2K13Þ (2) where R v is the radius of the monodispersed droplets, g m is the viscosity of the matrix, s 1 is the form relaxation time due to the relaxation of the interface, a is the interfacial tension of the blend, / is the volume fraction of the dispersed phase, and K 5 g i/ g m is the zero shear viscosity ratio of the droplet and matrix. Relaxation time is obtained basically from weighted relaxation spectrum (sH(s)).…”

Section: Characterization Of Pp/ps Blendsmentioning

confidence: 99%

“…Polymer functionalization and blending are two versatile and economical methods for new polymer material production . Polyolefins are the most widely used thermoplastics worldwide.…”

Section: Introductionmentioning

confidence: 99%

Preparation of polypropylene and polystyrene with NCO and NH₂ functional groups and their applications in polypropylene/polystyrene blends

Zhang

Zhu

et al. 2014

Polym Eng Sci

Self Cite

View full text Add to dashboard Cite

Isocyanate‐ and amine‐functionalized polypropylene (PP) and polystyrene (PS) were prepared through grafting and copolymerization method. These compounds are used as precursors for PP‐graft‐PS (PP‐g‐PS) copolymers and reacted at the matrix interface of PP/PS blends. Functionalized polymer structures were characterized by 1H NMR and FTIR spectroscopy. The effects of the synthesized compatibilizer on the rheological and morphological behavior of PP/PS blends were investigated systematically. Results showed that the functional polymer was successfully synthesized, and the additional two different compatibilizer systems dramatically decreased the size of the dispersed phase domains in PP/PS blends. Compared with the uncompatibilized blends, compatibilized blends exhibited a slightly higher crystallization temperature because the melting points of the blend components were not evidently affected by the addition of compatibilizer, as revealed by differential scanning calorimetry. The compatibilizer effect on the PP/PS blends was reflected through rheological property and dynamic mechanical analysis. POLYM. ENG. SCI., 55:614–623, 2015. © 2014 Society of Plastics Engineers

show abstract

“…The tensile properties of the samples before and after self-healing were measured on a series of thin elastomer films (100-200 μm) in order to determine Young's moduli and tensile strengths by uniaxial extensional rheology, using an ARESG2 rheometer with an SER2 geometry, as described by Zhang et al 25 The test specimen was elongated uniaxially at a steady Hencky strain rate of 0.01 (s -1 ) until sample failure in the middle part. Young's moduli were obtained from the tangent of the stress-strain curves at a 5% strain.…”

Section: Self-healing High-permittivity Silicone Dielectric Elastomermentioning

confidence: 99%

Self-Healing, High-Permittivity Silicone Dielectric Elastomer

2016

View full text Add to dashboard Cite

Currently used dielectric elastomers do not have the ability to self-heal after detrimental events such as tearing or electrical breakdown, which are critical issues in relation to product reliability and lifetime. In this paper, we present a self-healing dielectric elastomer that additionally possesses high dielectric permittivity and consists of an interpenetrating polymer network of silicone elastomer and ionic silicone species that are cross-linked through proton exchange between amines and acids. The ionically cross-linked silicone provides self-healing properties after electrical breakdown or cuts made directly to the material due to the reassembly of the ionic bonds that are broken during damage. The dielectric elastomers presented in this paper pave the way to increased lifetimes and the ability of dielectric elastomers to survive millions of cycles in high-voltage conditions.

show abstract

Rheological properties and morphological evolutions of polypropylene/ethylene‐butene copolymer blends

Cited by 9 publications

References 44 publications

Towards a universal shear correction factor in filament stretching rheometry

Towards a universal shear correction factor in filament stretching rheometry

Preparation of polypropylene and polystyrene with NCO and NH₂ functional groups and their applications in polypropylene/polystyrene blends

Self-Healing, High-Permittivity Silicone Dielectric Elastomer

Contact Info

Product

Resources

About

Rheological properties and morphological evolutions of polypropylene/ethylene‐butene copolymer blends

Cited by 9 publications

References 44 publications

Towards a universal shear correction factor in filament stretching rheometry

Towards a universal shear correction factor in filament stretching rheometry

Preparation of polypropylene and polystyrene with NCO and NH2 functional groups and their applications in polypropylene/polystyrene blends

Self-Healing, High-Permittivity Silicone Dielectric Elastomer

Contact Info

Product

Resources

About

Preparation of polypropylene and polystyrene with NCO and NH₂ functional groups and their applications in polypropylene/polystyrene blends