Effects of the distributions of polypropylene fibre properties on the tensile response of fibre assemblies

Andreassen, Erik; Hinrichsen, Einar L.; Grøstad, Kristin; Myhre, Ole Jan; Braathen, Marianne D.

doi:10.1016/0032-3861(95)93920-h

Cited by 8 publications

(4 citation statements)

References 22 publications

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“…Molecular number (Mn), functional ligands, and even backbone properties can be manipulated through purely chemical means. An increase in Mn often corresponds with increased mechanical strength [2] while the proper chemical structure allows for increased biocompatibility [3]. Additionally, manipulation of the final product often requires much more mild fabrication conditions as compared to other substances such as metals and ceramics [4,5].…”

Section: Introductionmentioning

confidence: 99%

Fabrication and Degradation of Electrospun Scaffolds from L-Tyrosine-Based Polyurethane Blends for Tissue Engineering Applications

Spagnuolo

Liu

2012

ISRN Nanotechnology

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It is important to control the degradation rate of a tissue-engineered scaffold so that the scaffold will degrade in an appropriate matching rate as the tissue cells grow in. A set of potential tissue engineering scaffolds with controllable rates of degradation were fabricated from blends of two biocompatible, biodegradable L-tyrosine-based polyurethanes (PEG 1000 -HDI-DTH and PCL 1250 -HDI-DTH) using the electrospinning process. The scaffolds were characterized by mat morphology, fiber diameter, diameter distribution, pore size, and hydrolytic degradation behavior. The majority of the scaffolds, despite having radically different chemical compositions, possessed no statistical difference with pore sizes and fiber diameters. The degradation pattern observed indicated that scaffolds consisting of a greater mass percentage of PEG 1000 -HDI-DTH decayed to a greater extent than those containing higher concentrations of PCL 1250 -HDI-DTH. The degradation rates of the electrospun scaffolds were much higher than those of the thin cast films with same compositions. These patterns were consistent through all blends. The work demonstrates one practical method of controlling the degradation of biopolymer scaffolds without significantly affecting an intended morphology.

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Section: Introductionmentioning

confidence: 99%

Fabrication and Degradation of Electrospun Scaffolds from L-Tyrosine-Based Polyurethane Blends for Tissue Engineering Applications

Spagnuolo

Liu

2012

ISRN Nanotechnology

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“…Furthermore, the modulus of the composite is slightly less than that of either constituent. Considering the weak bonding expected between epoxy and PP, it is likely that the reduction in stiffness as well as the increased strain‐to‐failure is a result of non‐uniform loading of fibers throughout the bundle due to variations in individual fiber length and stress–strain behavior, factors that have been demonstrated to lead to increased elongation and decreased stiffness of fiber bundles compared with individual filament . Further mechanisms for toughening include crack deflection at the weak PP‐epoxy interface as well as crack bridging by the PP filaments have been exploited to impart ductility to ceramic and other traditionally brittle systems .…”

Section: Discussionmentioning

confidence: 99%

The design and performance of a polymer ribbon‐reinforced transparent composite material

et al. 2016

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For the purpose of producing polymer ribbon/polymermatrix composites, we manufacture rectangular cross section ribbons directly by spinning from a rectangular die. A range of optical techniques, including the interferometric measurement of filament refractive index and characterization of composite optical performance through the modulation transfer function, are employed to quantify properties and guide system design. The interferometric measurements revealed that, compared with previous mechanically worked filaments, the die spun filaments have a more uniform optical path across the fiber. These measurements also enabled characterization of the filament's chromatic dispersion and allowed for matching the matrix refractive index across the visible spectrum. The results show that composites manufactured from rectangular die-spun ribbons have excellent optical properties with a significant optical performance improvement over previous work. POLYM. COMPOS., 39:2523-2534

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“…Also for non-elastic materials, with higher ultimate strain, the e m -s m distribution is related to the typical shape of the stress-strain curves near the point of break. However, the e m -s m correlation is usually lower, due to higher scatter among the stress-strain curves [22][23]. Even if the correlation is high, R cvm is usually above unity, because, as a first approximation, s m can be expressed as s b = a e m + b (a and b positive constants) (15) leading to CV(s m ) < CV(e m ).…”

Section: Experimental Data On Distributions Of Ultimate Stress and St...mentioning

confidence: 99%

A Model for Fracture Probability as a Function of Stress and Strain

Andreassen

2002

Journal of Reinforced Plastics and Composites

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Distributions of ultimate stress (σ m) and strain (ε m) are obtained by Monte-Carlo simulations with a chain-of-bundles (COB) model. The COB contains linear-elastic elements, for which the fracture probability distribution of stress and strain is varied. Various entities describing the combined distribution of σ m and ε m for the COB are calculated. Simulated σ m - ε m distributions resemble those observed experimentally for various materials. Experimental trends for the combined σ m - ε m distributions, which are observed when, e.g., changing material parameters or processing conditions, can be interpreted in terms of changes in critical substructures, and simulations like those presented here may be useful in such studies.

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Effects of the distributions of polypropylene fibre properties on the tensile response of fibre assemblies

Cited by 8 publications

References 22 publications

Fabrication and Degradation of Electrospun Scaffolds from L-Tyrosine-Based Polyurethane Blends for Tissue Engineering Applications

Fabrication and Degradation of Electrospun Scaffolds from L-Tyrosine-Based Polyurethane Blends for Tissue Engineering Applications

The design and performance of a polymer ribbon‐reinforced transparent composite material

A Model for Fracture Probability as a Function of Stress and Strain

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