Isotope effects on the glass transition phenomena and thermal properties of B2O3 glass

AbstractPhosphate glasses are novel amorphous biomaterials due to their fully resorbable characteristics, with controllable degradation profiles. In this study, phosphate glasses containing titanium and/or iron were identified to exhibit sufficiently matched thermal properties (glass transition temperature, thermal expansion coefficient and viscosity) which enabled successful co-extrusion of glass billets to form a core/clad preform. The cladding composition for the core/clad preforms were also reversed. Fe clad and Ti clad fibres were successfully drawn with an average diameter of between 30~50 μm. The average cladding annular thickness was estimated to be less than 2 μm. Annealed core/clad fibres were degraded in PBS for a period of 27 days. The strength of the Fe clad fibres appeared to increase from 303 ± 73 MPa to 386 ± 45 MPa after nearly 2 weeks in the dissolution medium (phosphate buffered solution) before decreasing by day 27. The strength of the Ti clad fibres revealed an increase from 236 ± 53 MPa to 295 ± 61 MPa when compared at week 3. The tensile modulus measured for both core/clad fibres ranged between 51 GPa to 60 GPa. During the dissolution study, Fe clad fibres showed a peeling mechanism compared to the Ti clad fibres.

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Synthesis and Thermal Properties of a Boron-Containing Bisphenol-S Formaldehyde Resin

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.239-242.2905 ◽

2011 ◽

Vol 239-242 ◽

pp. 2905-2908 ◽

Cited By ~ 2

Author(s):

Jun Gang Gao ◽

Wei Hong Wu ◽

Xing Li

Keyword(s):

Thermal Stability ◽

Glass Transition ◽

Thermal Properties ◽

Degradation Rate ◽

Formaldehyde Resin ◽

Curing Process ◽

Bisphenol S ◽

Coordinate Structure ◽

H Nmr ◽

Degradation Temperature

Boron-containing bisphenol-S formaldehyde resin (BBPSFR) was synthesized by formalin method. The structure and thermal properties of BBPSFR were characterized by 1H NMR, FTIR, torsional braid analysis (TBA) and thermogravimetric analysis (TGA), respectively. The results showed that the borate had formed, and the six-member ring containing boron-oxygen coordinate structure also formed during the curing process. The glass transition temperature (Tg) of BBPSFR is higher 104°C than that of bisphenol-S formaldehyde resins (BPSFR); the initial degradation temperature (Ti ) increases about 43°C; thermal degradation rate decrease and thermal stability increase significantly.

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Calorimetric Studies on Glasses and Glass Transition Phenomena

Assignment of the Glass Transition ◽

10.1520/stp15369s ◽

2009 ◽

pp. 120-120-17

Author(s):

S-S Chang

Keyword(s):

Glass Transition ◽

Calorimetric Studies ◽

Glass Transition Phenomena

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Thermal Properties of Bi2O3-B2O3-ZnO Glass System

Materials Science Forum ◽

10.4028/www.scientific.net/msf.510-511.578 ◽

2006 ◽

Vol 510-511 ◽

pp. 578-581 ◽

Cited By ~ 10

Author(s):

Yu Jin Kim ◽

Seong Jin Hwang ◽

Hyung Sun Kim

Keyword(s):

Glass Transition ◽

Thermal Properties ◽

Transition Temperature ◽

Glass Transition Temperature ◽

Lead Oxide ◽

Lead Free ◽

Oxide Glasses ◽

Glass Formation Region ◽

Formation Region ◽

Lower Glass Transition Temperature

Oxide glasses having lower glass transition temperature are widely used in electric devices. The oxide glasses usually contain lead oxide. Recently, lead oxide glasses have been replaced with lead-free oxide glasses because of the environmental pollution. We investigated the thermal properties and the glass formation region in the Bi2O3-B2O3-ZnO ternary system. The results showed that the ratio of Tg/Tl of the bismate glasses is around 0.55, which is lower than the value of ratio 0.67, the two-third rule (Tg/ Tl=2/3)

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Studies on Mechanical and Thermal Properties of Epoxy Resin Modified by Fluorine-Containing Silicone

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.401-403.713 ◽

2013 ◽

Vol 401-403 ◽

pp. 713-716

Author(s):

Cheng Fang ◽

Dong Bo Guan ◽

Wei Guo Yao ◽

Shou Jun Wang ◽

Hui An

Keyword(s):

Glass Transition ◽

Thermal Properties ◽

Epoxy Resin ◽

Bending Strength ◽

Mechanical And Thermal Properties ◽

Curing Agent ◽

Epoxy System ◽

Resin Curing ◽

The Impact ◽

Modified Epoxy

The epoxy resin was modified with the mixture of α,ω-dihydroxy poly-(3,3,3-trifluoropropyl) siloxane (PTFPMS), KH560 and stannous octoate. KH560 can react with PTFPMS and also epoxy resin curing agent. The two reactions were characterized by FI-IR. The modified epoxy resin was characterized by FI-IR. The result showed that fluorine-containing silicone had been successfully introduced into the epoxy system. The mechanical and thermal properties of the modified epoxy resin were analyzed. The results showed that with the increase of PTFPMS the impact strength of epoxy resin increased, hardness and bending strength correspondingly reduced, slight decrease in the glass transition temperature.

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