Comparisons of complex modulus provided by different DMA

Henriques, Isadora Ruas; Borges, Lisa; Costa, Marysilvia Ferreira da; Soares, Bluma G.; Castello, Daniel A.

doi:10.1016/j.polymertesting.2018.10.034

Cited by 33 publications

(16 citation statements)

References 29 publications

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“…The measured stiffness is higher than the one measured with the DMA tests. This difference can be attributed to the inaccuracy of the stiffness measurement using DMA apparatus [31]. Indeed, it is well-known that the material stiffness is generally under-estimated in DMA, in particular due to the clamping conditions, to the strain measurement (based on the machine displacement) and to the machine compliance.…”

Section: Effect Of the Epoxide Function/anhydride Ratio On The Thermomentioning

confidence: 99%

New Eco-Friendly Synthesized Thermosets from Isoeugenol-Based Epoxy Resins

et al. 2020

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Epoxy resin plays a key role in composite matrices and DGEBA is the major precursor used. With the aim of favouring the use of bio resources, epoxy resins can be prepared from lignin. In particular, diglycidyl ether of isoeugenol derivatives are good candidates for the replacement of DGEBA. This article presents an effective and eco-friendly way to prepare epoxy resin derived from isoeugenol (BioIgenox), making its upscale possible. BioIgenox has been totally characterized by NMR, FTIR, MS and elemental analyses. Curing of BioIgenox and camphoric anhydride with varying epoxide function/anhydride molar ratios has allowed determining an optimum ratio near 1/0.9 based on DMA and DSC analyses and swelling behaviours. This thermoset exhibits a Tg measured by DMA of 165 °C, a tensile storage modulus at 40 °C of 2.2 GPa and mean 3-point bending stiffness, strength and strain at failure of 3.2 GPa, 120 MPa and 6.6%, respectively. Transposed to BioIgenox/hexahydrophtalic anhydride, this optimized formulation gives a thermoset with a Tg determined by DMA of 140 °C and a storage modulus at 40 °C of 2.6 GPa. The thermal and mechanical properties of these two thermosets are consistent with their use as matrices for structural or semi-structural composites.

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Section: Effect Of the Epoxide Function/anhydride Ratio On The Thermomentioning

confidence: 99%

New Eco-Friendly Synthesized Thermosets from Isoeugenol-Based Epoxy Resins

et al. 2020

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“…In this instance T g will be quoted as the temperature at which tan (δ) is a maximum, which is a higher estimate of T g compared to that quoted from the storage modulus or DSC T g , but commonly used in literature. It is important to note that the DMA results are highly dependent on the test parameters due to the rate dependency of polymers and the test machine used [33,34].…”

Section: Dynamic Mechanical Analysismentioning

confidence: 99%

“…The DSC T g is used for this normalisation as the T g value is only dependent on heating rate, unlike the DMA T g which is dependent on more testing parameters (e.g. heating rate, test frequency, level of applied strain and instrument used [33]). Although in this instance if the failure envelopes were to be plotted using the DMA tan (δ) T g then the difference would be negligible.…”

Section: Failure Envelopementioning

confidence: 99%

The effect of HMMM crosslinker content on the thermal-mechanical properties of polyester coil coatings

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Lowe

et al. 2019

Progress in Organic Coatings

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“…According to Henriques et al (Henriques, Borges, Costa, Soares, & Castello, 2018), three-point bending test is the most appropriate test to perform DMA in natural materials like timber and bamboo, since this configuration has fewer effects due to geometry or clamping mechanism. The test consists of having a simply supported beam which is subjected to an oscillating concentrated load imposed at mid-span, and an increase of temperature applied simultaneously.…”

Section: Experimental Methodologymentioning

confidence: 99%

Fire analysis of load-bearing bamboo structures

González¹

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The remarkable high strength-to-weight ratio of bamboo and the recent innovations and development of laminated bamboo products has enabled the potential for new larger and taller structural bamboo applications. However, there is little understanding of the behaviour and performance of bamboo structures during and after a fire. To date, bamboo has been used widely in low-rise constructions I am infinitely grateful with my amazing friends from the coffee, and beer club, Angela, Aaron, Juan Patricio, Ian, Luis, Sergio, Jaime, Andrea, Abed. I would not have completed this journey without your support and positive energy. They became like my family in Brisbane, and when I had to push uphill, they were always there to struggle with me, to motivate me, to make me grow, and make me laugh in the happiest and most difficult moments. My love and respect go to the UQ Fire family for their support, enlightening conversations, and diligent work.

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Comparisons of complex modulus provided by different DMA

Cited by 33 publications

References 29 publications

New Eco-Friendly Synthesized Thermosets from Isoeugenol-Based Epoxy Resins

New Eco-Friendly Synthesized Thermosets from Isoeugenol-Based Epoxy Resins

The effect of HMMM crosslinker content on the thermal-mechanical properties of polyester coil coatings

Fire analysis of load-bearing bamboo structures

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