Volume dilatometry

Bekkedahl, Norman

doi:10.6028/jres.043.017

Cited by 159 publications

(30 citation statements)

References 19 publications

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“…A new method using rheometry is also detailed in this study and is compared to the current industry standard methods. Volume dilatometry is based on the measurement of volume change and, for many years, mercury-based dilatometers were the only means to measure shrinkage [6][7][8][12][13][14]. In this instrument, the body of the capillary dilatometer is first filled with the uncured resin and then surrounded with an immiscible fluid (often water [15] or mercury) which extends into a graduated capillary.…”

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confidence: 99%

Evaluation of cure shrinkage measurement techniques for thermosetting resins

2010

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Resin chemical shrinkage dictates the surface integrity and the roughness of a composite structure. Thus, to minimize surface failures and to produce a good surface quality it is a requisite to be able to measure and track resin shrinkage during the cure process. This manuscript investigates and evaluates the measuring and monitoring of real-time resin shrinkage using a rheometer, a helium-based pycnometer and a thermo-mechanical analyzer (TMA) for ambient curing UP and epoxy resins. Shrinkage readings obtained from the newly developed robust technique with the rheometer concur well with readings from the traditional pycnometric method. They also coincide within the accepted literature values of 7-10% and 3.5-4.5% for the UP and epoxy systems, respectively. Shrinkage measurements during post-cure were effectively carried out at an elevated temperature, suggesting that the methodology provided can be applied to non-ambient curing systems.The TMA was found to be unsuccessful in measuring shrinkage reliably.

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Section: Page 3 Of 20mentioning

confidence: 99%

Evaluation of cure shrinkage measurement techniques for thermosetting resins

2010

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“…We used in this study Bekkedahl-type dilatometers [9,10], in which a long calibrated capillary (ca. 0.4 mm 2) was connected to a cylindrical bulb.…”

Section: Methodsmentioning

confidence: 99%

Dilatometric investigation of thermotropic linear chain copper (II) alkanoates

Abied

Guillon

Skoulios

et al. 1988

Colloid & Polymer Sci

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Abstract:The molar volumes of three binuclear copper (II) alkanoates (cupric octadecanoate, docosanoate, and tetracosanoate) were measured over the temperature range 30 ~ 200 ~ which encompasses their phase transition to a columnar mesophase. A sharp volume increase in a narrow temperature interval about the transition was observed, consistent with a first-order phase transition. Values obtained for the partial molar volume of a methylene group in the columnar mesophase (16.9 _+ 0.3 cm3/mol) are between those for crystalline paraffins and for other smectic or discotic mesogens, respectively, indicating a disordered state, but not a complete fusion, of the aliphatic chains of the copper soaps in their columnar mesophase. The stacking period of the binuclear copper complexes in a column was derived from a combination of dilatometric and X-ray data. Its value, 4.64 _+ 0.08 lk, is independent of the chain length of the complex and of the temperature.

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“…Volume measurements were carried out using the Bekkedahl dilatometric technique [14] already described elsewhere [15]. X-ray diffraction data were collected using a vacuum small-angle camera equipped with a bent gold plated glass mirror ( Fig.…”

Section: Introductionmentioning

confidence: 99%

Volume and X-ray diffraction study of terephthal-bis-4,n-decylaniline (TBDA)

1986

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Résumé. 2014 On présente une étude systématique du polymorphisme smectique du TBDA par dilatométrie et diffraction des rayons X aux petits angles. En conjuguant les données expérimentales recueillies à l'aide des deux techniques, on a déterminé l'évolution de l'aire moléculaire et l'angle d'inclinaison des molécules en fonction de la température. On a, enfin, discuté les résultats obtenus notamment en relation avec la nature et l'extension de l'ordre dans les mésophases smectiques F, I et C.Abstract 2014 This is a systematic study of the smectic polymorphism of TBDA, carried out using dilatometry and small-angle X-ray diffraction. By combining the experimental data collected by the two techniques, the thermal evolution of the molecular area and the tilt angle of the molecules have been determined The results are discussed particularly in relation to the nature and the spatial extension of order in the smectic F, I and C mesophases.J. Physique 47 (1986)

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Volume dilatometry

Cited by 159 publications

References 19 publications

Evaluation of cure shrinkage measurement techniques for thermosetting resins

Evaluation of cure shrinkage measurement techniques for thermosetting resins

Dilatometric investigation of thermotropic linear chain copper (II) alkanoates

Volume and X-ray diffraction study of terephthal-bis-4,n-decylaniline (TBDA)

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