Effects of water sorption on the physical properties of PET, PBT, and their long fibers composites

Bastioli, Catia; Guanella, I.; Romano, G.

doi:10.1002/pc.750110102

Cited by 44 publications

(40 citation statements)

References 9 publications

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Section: Effects Of Thermal and Hygrothermal Ageing On Tensile Behaviourmentioning

confidence: 99%

“…Although Fickian behaviour has been observed for most of the polymers, some exceptions in some conditions have also been reported . For example, at elevated temperatures where the thermal ageing, oxidation, leaching and formation of crystalline are important, there is more deviation from Fick's law . In the study of Bastioli et al on PBT and PET thermoplastic composites, the maximum water absorbed increased as ageing temperature increased, probably because of the modification of crystalline‐amorphous interface during the absorption process.…”

Section: Effects Of Thermal and Hygrothermal Ageing On Tensile Behaviourmentioning

confidence: 99%

“…Fick's law has been used to model kinematics of water absorptions in most of studies considered hygrothermal ageing effects, expressed as:

\frac{M_{t}}{M_{m}} = \frac{4}{π^{1 / 2}} {(\frac{D t}{h^{2}})}^{1 true/ 2} f o r \frac{normalD normalt}{h^{2}} < 0.05,

\frac{M_{t}}{M_{m}} = 1 - \frac{8}{π^{2}} normalexp ((), prefix- ((), \frac{D t}{h^{2}}) π^{2}) f o r \frac{normalD normalt}{h^{2}} > 0.05 .

…”

Section: Effects Of Thermal and Hygrothermal Ageing On Tensile Behaviourmentioning

confidence: 99%

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Tensile, creep and fatigue behaviours of short fibre reinforced polymer composites at elevated temperatures: a literature survey

Eftekhari

Fatemi

2015

Fatigue Fract Eng Mat Struct

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Polymer composites are suitable alternatives to metals in some applications as they are cost effective, lightweight and corrosion resistant. Short fibre reinforced polymer composites (SFRPCs) are typically subjected to complex loadings in applications, including static, cyclic, thermal and their combinations. These applications may also involve harsh environmental conditions such as elevated temperature and moisture which can dramatically affect mechanical properties. In this paper, a broad survey of the literature on mechanical behaviour of SFRPCs at elevated temperatures is presented. The mechanical behaviours included consist of tensile, creep, isothermal fatigue, thermo‐mechanical fatigue and creep–fatigue interaction. Environmental effects such as moisture and ageing at elevated temperatures are also included. The studies reviewed include experimental works, modelling works and failure mechanisms studies. A critical assessment of the information from the literature presented for each type of behaviour is also provided.

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Section: Effects Of Thermal and Hygrothermal Ageing On Tensile Behaviourmentioning

confidence: 99%

Section: Effects Of Thermal and Hygrothermal Ageing On Tensile Behaviourmentioning

confidence: 99%

“…Fick's law has been used to model kinematics of water absorptions in most of studies considered hygrothermal ageing effects, expressed as:

\frac{M_{t}}{M_{m}} = \frac{4}{π^{1 / 2}} {(\frac{D t}{h^{2}})}^{1 true/ 2} f o r \frac{normalD normalt}{h^{2}} < 0.05,

\frac{M_{t}}{M_{m}} = 1 - \frac{8}{π^{2}} normalexp ((), prefix- ((), \frac{D t}{h^{2}}) π^{2}) f o r \frac{normalD normalt}{h^{2}} > 0.05 .

…”

Section: Effects Of Thermal and Hygrothermal Ageing On Tensile Behaviourmentioning

confidence: 99%

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Tensile, creep and fatigue behaviours of short fibre reinforced polymer composites at elevated temperatures: a literature survey

Eftekhari

Fatemi

2015

Fatigue Fract Eng Mat Struct

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“…DSC was also used to analyze neat PBT fibers (drawn and extracted), and the SPCs after hot compaction, and identify their respective crystallinities, with enthalpy of melting of 100% crystalline PBT taken as 143.4 J=g [48] , and crystallinity of each examined material calculated from their enthalpies of melting with respect to that of fully crystalline PBT.…”

Section: Thermal Characterization Using Differential Scanning Calorimmentioning

confidence: 99%

Nanofibrillar Polymer-Polymer and Single Polymer Composite Involving Poly(Butylene Terephthalate): Preparation and Mechanical Properties

Panamoottil¹,

Bhattacharyya²,

Fakirov³

2013

Polymer-Plastics Technology and Engineering

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Nanofibrillar composites (NFCs) of polypropylene (PP) and poly(butylene terephthalate) (PBT) were produced with PBT as reinforcement. The two polymers were melt-blended, extruded and cold-drawn via necking in order to convert PBT into a nanofibrillar state. The drawn blend was used for manufacture of NFCs via compression moulding. PBT fibrils were isolated by selective dissolution of PP, and used to produce single polymer composites (SPCs), using a one-constituent approach (hot compaction), and a two-constituent approach (film stacking). NFCs and SPCs were subjected to tensile testing to obtain tensile modulus and tensile strength values. Scanning electron microscopy was used to observe PBT fibrils before and after processing of SPCs, having diameters between 100 and 150 nm. For the SPCs, the improvements in tensile modulus (compared to isotropic PBT) were 32% and 36% for the one constituent and two constituent approach, respectively. The corresponding values for tensile strength were 20% and À18%. NFCs of PP/ PBT showed an improvement of 55% in tensile modulus, and 50.24% in tensile strength as compared to isotropic PP.

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“…While there is no concern about the time dependence of the mechanical properties of commonly used metal wires in the oral environment, both time and environment affect significantly the performance of FRC appliances [13][14][15][16]. These effects in long-fibre thermoplastic composites are assumed to be mostly due to the hydrolytic deterioration of the fibres, matrix and interface [17] as well as the viscoelastic character of the matrix [18].…”

Section: Introductionmentioning

confidence: 99%

Fibre reinforced thermoplastic composites for dentistry

Jančář

Dibenedetto

1993

J Mater Sci: Mater Med

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Clinical implementation of fibre-reinforced composites (FRCs) for treatment of misaligned teeth requires a stability of the material under stress in a moist environment. The performance of the material is strongly dependent on its resistance to hydrolytic deterioration of the components. Of particular concern are the quality and durability of the interfaces between the fibres and the matrix. Scanning electron microscopy (SEM) was utilized to evaluate qualitatively the effect of water immersion on the interfaces between constituents in a variety of E-glass fibre-reinforced thermoplastics. A particular series of organosilane-coated fibres embedded in polycarbonate (PC) were chosen for further quantitative study of the residual shear strength of the interfaces using an embedded-single-fibre test. Annealed PC and maleated polypropylene (MPP) reinforced with bare E-glass fibres have an appropriate combination of mechanical properties and environmental stability for potential orthodontic applications. The usual sizing agents used for commercial E-glass fibres interfere with the bonding of the fibres to the matrix and the usual silane treatments used to promote bonding could lead to problems of hydrolytic stability under extreme conditions of stress and moisture.

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Effects of water sorption on the physical properties of PET, PBT, and their long fibers composites

Cited by 44 publications

References 9 publications

Tensile, creep and fatigue behaviours of short fibre reinforced polymer composites at elevated temperatures: a literature survey

Tensile, creep and fatigue behaviours of short fibre reinforced polymer composites at elevated temperatures: a literature survey

Nanofibrillar Polymer-Polymer and Single Polymer Composite Involving Poly(Butylene Terephthalate): Preparation and Mechanical Properties

Fibre reinforced thermoplastic composites for dentistry

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