Decoupling between birefringence decay, enthalpy relaxation and viscous flow in calcium boroalumosilicate glasses

Deubener, Joachim; Yue, Yuanzheng; Bornhöft, Hansjörg; Ya, Min

doi:10.1016/j.chemgeo.2008.06.052

Cited by 29 publications

(47 citation statements)

References 35 publications

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“…These include extruded rods and birefringent fibers of metaphosphate compositions formed at extreme strain rates, which result in orientation-dependent static 31 P nuclear magnetic resonance spectroscopy ͑NMR͒ spectra, 7,8 and nonisometric halos of wide angle x-ray diffraction ͑WAXS͒ patterns. 9 In contrast to the behavior of the "polymerlike" structure of metaphosphate glasses, the lack of short-range structural orientation in birefringent borosilicate, boron oxide and silicate glass fibers has been evidenced by 11 B, 27 Al, and 29 Si NMR ͑Ref. 10͒ as well as by WAXS.…”

Section: Structural Response Of a Highly Viscous Aluminoborosilicate mentioning

confidence: 99%

Structural response of a highly viscous aluminoborosilicate melt to isotropic and anisotropic compressions

Deubener

Stebbins

et al. 2009

The Journal of Chemical Physics

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Thermodynamics of viscous flow and elasticity of glass forming liquids in the glass transition range J. Chem. Phys. 135, 184501 (2011); 10.1063/1.3656695 Structural heterogeneity and pressure-relaxation in compressed borosilicate glasses by in situ small angle X-ray scattering J. Chem. Phys. 134, 204502 (2011); 10.1063/1.3593399Relaxation and Prigogine-Defay ratio of compressed glasses with negative viscosity-pressure dependence Aluminoborosilicate melts of E-glass composition have been compressed at pressures up to 500 MPa and subsequently cooled ͑4-5 K min −1 ͒ under pressure from well above the glass transition to room temperature. It is found that increasing uniaxial pressure lead to anisotropic glasses with increasing permanent birefringence, while increasing isostatic pressure resulted in isotropic glasses with increasing density ͑compaction of 2.1% at 500 MPa͒. Static and magic-angle spinning nuclear magnetic resonance spectroscopy of 11 B, 23 Na, 27 Al, and 29 Si were performed to explore pressure-induced changes in the short-range structure of these glasses. NMR experiments readily detected increasing IV B, V Al, and VI Al concentrations with pressure as well as a decrease in the mean distance of sodium to oxygen atoms ͑0.7% at 500 MPa͒, but no detectible evidence of short-range structural orientation around these atoms in the birefringent glasses were found. Quantifying the changes in the local boron, aluminum, silicon, and sodium environments revealed that the measured increase of recovered density with pressure in E-glass can only be partly explained by increase in B and Al coordination, and that overall compression of the network and of the network modifier cation volumes must also be important. Structural changes in the intermediate range, which were not detected by NMR, are discussed as a source of birefringence in anisotropic E-glass.

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Section: Structural Response Of a Highly Viscous Aluminoborosilicate mentioning

confidence: 99%

Structural response of a highly viscous aluminoborosilicate melt to isotropic and anisotropic compressions

Deubener

Stebbins

et al. 2009

The Journal of Chemical Physics

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“…The temperature range over which this phenomenon acts corresponds closely with that over which enthalpy relaxation of GF by DSC has been shown in numerous works [32,[50][51][52][53]. It seems reasonable to conclude that these works demonstrate related phenomena; the conclusions that long-range relaxation or reorganisation of the glass network is responsible appear plausible.…”

Section: Thermal Compaction or Enthalpy Relaxationmentioning

confidence: 80%

“…In some more recent studies [32,[50][51][52][53], the relaxation of GF was studied using differential scanning calorimetry (DSC). The release of energy from fibre samples during temperature scans was measured over a wide range of times and temperatures.…”

Section: Thermal Compaction or Enthalpy Relaxationmentioning

confidence: 99%

Glass Fibre Strength—A Review with Relation to Composite Recycling

Thomason

Jenkins

Yang

2016

Fibers

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Abstract:The recovery and reuse of glass fibres from manufacturing waste and end-of-life composites in an environmentally-friendly, cost-effective manner is one of the most important challenges facing the thermosetting polymer composites industry. A number of processes for recycling fibres from such materials are available or under development. However, nearly all options deliver recycled glass fibres that are not cost-performance competitive due to the huge drop in strength of recycled glass fibre compared to its original state. A breakthrough in the regeneration of recycled glass fibre performance has the potential to totally transform the economics of recycling such composites. This paper reviews the available knowledge of the thermally-induced strength loss in glass fibres, discusses some of the phenomena that are potentially related and presents the status of research into processes to regenerate the strength and value of such weak recycled glass fibres.

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“…A strong decoupling between a-, b-and c-relaxation, i.e. a large discrepancy between the activation energies for b-relaxation, E b , c-relaxation, E c , and the viscous flow E a has been demonstrated for sodium trisilicate glasses [53,54]. Therefore, comparing the relaxations of PTR glass and sodium trisilicate glass we used a reduced temperature scale, with T g = T 12 (isokom temperature T 12 for which the Newtonian viscosity is 10 12 Pa s) as scaling parameter (Fig.…”

Section: Discussionmentioning

confidence: 95%