A time‐dependent expression for thixotropic areas. Application to Aerosil 200 hydrogels

Dolz, M.; González, F.; Delegido, J.; Hernández, M. J.; Pellicer, J.

doi:10.1002/(sici)1520-6017(200006)89:6<790::aid-jps11>3.3.co;2-u

Cited by 22 publications

(25 citation statements)

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“…Thixotropic properties were defined by computation of the hysteresis loop surface area (4) and thixotropy index (5) as per the formulas:

S = S^{'} - S ″ = D_{m a x} η^{- 1} \sum_{i}^{n} Δ τ_{i}

where, S is the hysteresis loop surface area, S ′ and S ″ are the surface area of the upper and lower branch of the flow curve at a maximum shear speed from γ = 0 to γ max over the sum of the difference in strains of the upper and lower branch of the flow curve τ.…”

Section: Methodsmentioning

confidence: 99%

Rheological and fire properties of a composite of unsaturated polyester resin and halogen‐free flame retardants

Kużdżał

Cichy

Kicko-Walczak

et al. 2016

J of Applied Polymer Sci

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The main subject of the present research is to determine the impact of flame retarding fillers on macroscopic properties of composites. The effect on rheological properties of composition unsaturated polyester resin (UP) and flame retardant blend (FR) consisting of expandable graphite (EG) and or not modified silica and: (1) melamine polyphosphate (MPP) with ammonium polyphosphate (APP), (2) MPP with aluminum trihydrate (ATH), (3) only MPP was examined. Next, their influence on thixotropic properties of UP was estimated. FR fillers were compared according to their grain size, specific surface, and shape factor. Rheological properties were determined by applying hysteresis loop surface and thixotropy factor measuring. For the UP + FR composition, the dependence of grain morphological parameters, such as shape factor and specific surface, on viscosity and hysteresis loop surface was determined experimentally. All of the tested composites consisting of UP + 40% FR blend exhibits high flame resistance. An addition of only 2% of modified silica to all of the FR blends caused significant enlargement of hysteresis loop surface and thixotropy index. Hence, for the next stage of the research (an industrial test of GRP pipes casted by the centrifugal method) FR blend without modified silica was chosen. A composite consisting of UP, MP, APP and EG is characterized by lower heat release rate (HRRmax) (ca. 83%) and lower TSR (ca. 80%), ALMR (55%), and MARHE (73%) in comparison to UP resin; and that UP + FR composition exhibit satisfactory rheological properties as well. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017, 134, 44371.

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“…Thixotropic properties were defined by computation of the hysteresis loop surface area (4) and thixotropy index (5) as per the formulas:

S = S^{'} - S ″ = D_{m a x} η^{- 1} \sum_{i}^{n} Δ τ_{i}

Section: Methodsmentioning

confidence: 99%

Rheological and fire properties of a composite of unsaturated polyester resin and halogen‐free flame retardants

Kużdżał

Cichy

Kicko-Walczak

et al. 2016

J of Applied Polymer Sci

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“…Because of the thixotropic behavior of the samples, their viscosity values are lower in the second shear interval. Besides, the downward curve was always lower than the upward curve, which means that the system's internal structure recovered faster than it was damaged, reflecting its stability (Chhatbar et al, 2012;Dolz et al, 2000).…”

Section: Resultsmentioning

confidence: 98%

Correlation between rheological properties and capillary fixation for modelling creams

Demoliner

Agnol

Zanotti

et al. 2018

Braz. J. Pharm. Sci.

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The Brazilian male beauty market occupies the second place in world consumption of cosmetics. Among the numerous products consumed by such audience is the capillary fixation mask, which is mainly composed by fixatives. These additives act on stabilizing the cosmetic emulsion, protecting the hair against moisture and also increasing the intensity of hair fixation. In this work, three formulations for modelling creams were prepared by different concentrations of the fixatives Styleze TM W20 and PVP K90 and their properties characterized by physicochemical, rheological and sensory analysis. The capillary masks produced were stable oil-in-water (O/W) emulsions with uniform droplets of 2.05-2.82 μm sizes and pseudoplastic thixotropic behavior (0.19 < n < 0.26). It was possible to correlate the increased concentration of PVP K90 to a greater thixotropy and an improved yarn fixation, despite the worsening in the spreadability of the formulations. These results suggest properly conducted rheological measurements can contribute to the prediction of the emulsion's sensory properties, which can save time and funds on the development of new cosmetics.

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“…Areas under the upstream data point curve (A up ) and under the downstream data point curve (A down ) as well as the hysteresis area (A up − A down ) were obtained using the RheoWin Pro software (v. 3.61, Thermo Haake). Due to the influence of the loop contour and the shear resistance of the sample on the hysteresis area, the percentage of relative hysteresis area (A r ; equation [3]) was calculated because it allows a better comparison of the thixotropic behavior of different samples (Dolz et al, 2000):…”

Section: Rheological Measurementsmentioning

confidence: 99%

Fat replacers in low-fat carboxymethyl cellulose dairy beverages: Color, rheology, and consumer perception

Arancibia

Costell

Bayarri

2011

Journal of Dairy Science

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Low-fat foods are an interesting option for consumers interested in health-related issues or in maintaining adequate body weight; however, fat reduction may influence consumer acceptance of the end product. This study aims to obtain information about the effectiveness of λ-carrageenan and a blend (50:50) of short- and long-chain inulin as fat replacers in dairy beverages prepared with carboxymethyl cellulose (CMC) and to determine to what extent consumers perceive instrumental color and rheological differences among samples. Results showed that both λ-carrageenan and the inulin blend could be used as fat replacers in CMC-based dairy beverages and that consumers could distinguish among samples that differed in color and rheological behavior.

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A time‐dependent expression for thixotropic areas. Application to Aerosil 200 hydrogels

Cited by 22 publications

References 0 publications

Rheological and fire properties of a composite of unsaturated polyester resin and halogen‐free flame retardants

Rheological and fire properties of a composite of unsaturated polyester resin and halogen‐free flame retardants

Correlation between rheological properties and capillary fixation for modelling creams

Fat replacers in low-fat carboxymethyl cellulose dairy beverages: Color, rheology, and consumer perception

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