Thermal Analysis of Phase Transitions and Crystallization in Polymeric Fibers

Steinmann, Wilhelm; Walter, Stephan; Beckers, Markus; Seide, Gunnar Henrik; Gries, Thomas

doi:10.5772/54063

Cited by 18 publications

(15 citation statements)

References 35 publications

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“…It is known that a high molding temperature accelerates material brittleness. Consistent with literature data, [14][15][16][17][18][19][20][21][22] Nylon 6 presents three crystalline phases: α, γ and β (a mixture of both phases α and γ), depending on the crystallization conditions. Usually, Nylon 6 crystallizes in both phases, α and γ.…”

Section: Fourier Transform Infrared Spectroscopysupporting

confidence: 83%

Injection molded part material failure analysis

Solomon¹,

Solomon²

2020

Rev.Roum.Chim.

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In this study, the causes of the failure of an injection-molded polyamide part were analyzed. The working conditions of injection-molded parts are very complex depending on: pressure, temperature, friction, corrosion, etc. and, consequently, they could fail due to different reasons. Microscopic characterization, thermogravimetric analysis (TGA), differential scanning calorimetry (DSC) and FTIR spectroscopy were used for fracture analysis of defected parts. Mechanical testing (flexural modulus, torque and notched Izod impact test) was also considered for part failure analysis. This analysis suggests that the parts have failed because they were overloaded during assembly operation, and their material was harder (in a transition state between ductile and brittle) than the parts from normal production (in ductile state). Our investigations revealed that, due to plastic deformation at room temperature, Nylon 6 presents an unusual phase transformation. There are similarities between austenitic stainless steel and Nylon 6. Thus, it consists in the fact that their γ forms transform into α forms, due to an applied heat treatment or at room temperature as a result of an applied pressure (plastic deformation). In both situations, material became harder and then less resistant to applied physico-mechanical actions. In this particular case, an unusual local material hardening was observed due to a combined influence of two processes (cooling process, torque test), with a failure of the molded parts.

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Section: Fourier Transform Infrared Spectroscopysupporting

confidence: 83%

Injection molded part material failure analysis

Solomon¹,

Solomon²

2020

Rev.Roum.Chim.

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“…Fire retardant properties of nanocomposite bicomponent fibers are one of the most interesting characteristics for aviation industries . A conductive or magnetic nanomaterial in the core section can give new properties to the bicomponent fibers for using in electronic or smart clothing products . Some of these advanced functional fibers may be used in artificial organs, i.e., muscles or vessels.…”

Section: C/s Fibersmentioning

confidence: 99%

Recent advances in core/shell bicomponent fibers and nanofibers: A review

Naeimirad

Ali

Kotek

et al. 2018

J of Applied Polymer Sci

140

103

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There has been a steady progress in developing synthetic fibers in the past few years. Bicomponent fibers and nanofibers in a core/shell (C/S) configuration, including two dissimilar materials have presented unusual potential for use in many novel applications. These fibers can be produced using a variety of materials via different techniques i.e., coaxial melt spinning and electrospinning. In this review, we discuss the recent advances in C/S fibers and nanofibers' production. The first part has been assigned to the bicomponent fibers manufacturing technology, while production and applications of C/S nanofibers have been described in the second part.

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“…2. By applying temperature modulation to the standard temperature profile and measuring the time-dependent response of the sample, the reversing part of the heat flow can be identified, which is correlated to the heat capacity [58,61].…”

Section: Heat Capacitymentioning

confidence: 99%

“…24b). Since the temperature difference is proportional to the heat flow, it can be determined quantitatively by calibrating the method with substances with known melting enthalpy [58].…”

Section: Phase Transitionsmentioning

confidence: 99%

See 1 more Smart Citation

Essential Properties of Fibres for Composite Applications

Steinmann

Saelhoff

2016

Textile Science and Clothing Technology

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In this chapter, essential properties of fibres required for fabricating good performance composites are presented. Fundamental aspects of these properties and principles of their characterization techniques are discussed. Firstly, the geometrical aspects of fibres (for short and endless fibres) are described. The second part deals with the different types of structures in fibres with respect to molecular orientation mostly responsible for anisotropy of fibres. In the third part, the mechanical properties (especially tensile properties) and failure mechanisms for different types of fibres are discussed and correlated to the structure of the fibres. The following part is concerned with the surface of fibres, which is responsible for the interaction of the fibres with the matrix material in composites and has a large influence on the wetting behavior and adhesion to matrix materials. In the last parts, further physical properties (heat capacity, thermal conductivity, thermomechanical properties and electrical conductivity) and the durability of fibres are described.

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Thermal Analysis of Phase Transitions and Crystallization in Polymeric Fibers

Cited by 18 publications

References 35 publications

Injection molded part material failure analysis

Injection molded part material failure analysis

Recent advances in core/shell bicomponent fibers and nanofibers: A review

Essential Properties of Fibres for Composite Applications

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