The effect of anisotropy in wet spinning poly(p-phenyleneterephthalamide)

Weyland, H.G.

doi:10.1007/bf00255092

Cited by 13 publications

(2 citation statements)

References 1 publication

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“…Reduced viscosity (dL/g) Figure V. Relation between the reduced viscosity at 0.2 g/dL and the tensile strength of Twaron 1000 fibres aged under different conditions It appears that to a first approximation these two characteristics can be correlated using a linear relationship, which is in accordance with a previous study [Weyland, 1980]. This result supports that that the tensile strength is governed by the lateral intermolecular bonds, as presumed by Yoon [Yoon, 1990].…”

Section: Tensile Property Evolutionsupporting

confidence: 89%

Durabilité des géotextiles aramides en milieu alcalin

Derombise¹,

Schoors²,

Davies³

2009

Revue européenne de génie civil

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Because of their high initial properties, aramid geotextiles have been used for a decade for ground reinforcement. Today, the geotextiles manufacturers think about their use in alkaline grounds. However there are few data on the long-term behaviour of aramid fibres under these conditions. Consequently, a durability study in a basic environment has been carried out in order to improve understanding of the degradation mechanisms involved in ageing. On that purpose, the physico-chemical characteristics as well as the surface state and the mechanical properties of the Twaron 1000 fibres have been followed at different ageing times. Résumé : Du fait de leurs propriétés initiales élevées, les géotextiles à base de fibres aramides sont utilisés depuis une dizaine d'années pour le renforcement des sols. Aujourd'hui, les fabricants de géotextiles envisagent leur utilisation dans les sols alcalins. Cependant le comportement à long terme des fibres aramides dans ces conditions est encore mal connu. Une étude de durabilité en milieu basique a donc été initiée afin d'apporter une compréhension approfondie des mécanismes de dégradation mis en jeu. Ainsi, les caractéristiques physico-chimiques, l'état de surface, de même que les propriétés mécaniques des fibres Twaron 1000 ont été suivis à différents temps de vieillissement.

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Section: Tensile Property Evolutionsupporting

confidence: 89%

Durabilité des géotextiles aramides en milieu alcalin

Derombise¹,

Schoors²,

Davies³

2009

Revue européenne de génie civil

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“…Typical parameters determining the maximum strength level are the inherent viscosity of the polymer [Wey80] and the polymer concentration in homogeneous lyotropic spindopes [Kwo65]. Typical parameters reducing the maximum achievable strength are wide molecular weight distributions for the polymer, inhomogeneous spindopes, incorrect temperature settings along the spinline, unstable flow in the spinneret and resonance phenomena in the air gap, unfavourable physico-mechanical coagulation conditions leading to fibre inhomogeneities of all sorts, filament damage during washing and drying and many others.…”

Section: Relationship Between Microstructure and Resulting Propertiesmentioning

confidence: 99%

Structure and properties of aramid fibres

Zwaag

2009

Handbook of Textile Fibre Structure

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Fibrillar and microfibrillar structures in poly(p‐phenylene terephthalamide) fibers

1993

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The microfibrils and the microfibrillar network in poly(p-phenylene terephthalamide) (PPTA) fibers formed during the coagulation from a monodomain lyotropic fiber are stabilized by critical point drying and characterized by electron microscopy and small angle X-ray scattering. The diameter of the microfibrils varies from 20 to 49 nm depending on the PPTA concentration in the lyotropic solution used for the spinning. A formation mechanism for the microfibrils and the microfibrillar network is suggested. During the coagulation, the spinodal decomposition (phase separation) is assumed to occur before the crystallization (phase transition), resulting in the formation of the microfibrils. The formation of the microfibrillarnetwork is considered to be related to the misorientation ofmacromolecules and the density fluctuation in the crosssection of the filament during spinodal decomposition.

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The effect of anisotropy in wet spinning poly(p-phenyleneterephthalamide)

Cited by 13 publications

References 1 publication

Durabilité des géotextiles aramides en milieu alcalin

Durabilité des géotextiles aramides en milieu alcalin

Structure and properties of aramid fibres

Fibrillar and microfibrillar structures in poly(p‐phenylene terephthalamide) fibers

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