Rheological behaviour of low moisture molten maize starch

Vergnes, Bruno; Villemaire, J. P.

doi:10.1007/bf01333742

Cited by 121 publications

(64 citation statements)

References 13 publications

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“…[12][13][14][15][16][17][18][19][20][21][22][23] Despite the numerous applivolumetric flask containing 10 mL of distilled water and stirring gently with a stirring bar at 30 cations for starch, many unanswered questions remain regarding the basic rheological and physirpm to wet and disperse the granules thoroughly.…”

Section: Introductionmentioning

confidence: 99%

Network development during shear-thickening in semidilute solutions of gently solubilized starches

Carriere

1998

J. Polym. Sci. B Polym. Phys.

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Section: Introductionmentioning

confidence: 99%

Network development during shear-thickening in semidilute solutions of gently solubilized starches

Carriere

1998

J. Polym. Sci. B Polym. Phys.

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“…These include capillary and slit die work [222,231,[245][246][247][248][249][250][251][252][253]. was also adapted by Chen et al [91] to model soy dough extrusion rheology, and by…”

Section: Modelling Rheological Properties Of Starch Extrudatesmentioning

confidence: 99%

“…A number of researchers have used both capillary and slit die rheometry to investigate changes in the melt viscosity with shear rate at several temperatures for both natural and synthetic polymer melts. Single screw extruders [91,241,251,[255][256][257], twin screw extruders [250,[258][259][260][261], and pre-shearing rheometers that can control the extent of thermo-mechanical treatment before viscosity measurements [248,261] have all been used to pump starch-based melts through a die to determine the pressure profile along an axis of flow. Results from these experiments are usually gathered to develop models that predict the viscosity of the extruded starch material as a function of shear rate, temperature and moisture content [232,246,249,254], as well as the time-temperature effects that influence the extent of melting, gelatinisation and fragmentation [244,255,[257][258][259].…”

Section: Slit-die Extrusionmentioning

confidence: 99%

“…Some researchers have attempted to control the amount of thermo-mechanical treatment prior to viscosity measurements in an attempt to acquire data for the one rheological fluid at various shear rates [248,261]. However, controlling the amount of feed into the single screw extruder at constant screw speed as a means of separating the time of thermomechanical treatment and shear rate was not possible to any degree of control with the apparatus used in this study.…”

Section: Analysis Of Datamentioning

confidence: 99%

“…It was also noted that the consistency index is more sensitive than the flow index to humidity fluctuations of the storage environment. Increasing the moisture content (and therefore plasticiser level) and temperature have been shown repeatedly to decrease consistency index, K, for many starch-based materials [222,245,248,249,251,252,291,321]. van Lengerich [222] reported a value of 5841 Pa•s n for wheat starch with 25% moisture content extruded at 170°C, decreasing to 35 Pa•s n for wheat starch with 40% moisture content.…”

Section: The Effect Of Temperaturementioning

confidence: 99%

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A conceptual model of a sustainable system based upon observations of biodegradable plastic packaging film experiments and material flow

Fletcher¹

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One can imagine full knowledge of a system allows for optimal decision making when problems arising within that system need to be solved. In reality, solutions involving any non-trivial system must be pursued with incomplete knowledge. In light of the complexity and diversity of current industrial economic systems and the decision-making processes pertaining to them, integrating streams of knowledge would improve problem solving outcomes on such scales. More specifically, it could potentially address how to compare the rate of problem proliferation to solution implementation within a system. However, successfully integrating knowledge of diverse systems towards a common purpose requires careful and consistent analogies to be constructed between the entities of those systems. The current work investigates the merits of such an approach for resolving sustainable development issues. The hypothesis is that knowledge of what influences the flow and transformation of matter, (that is, what influences a common phenomenon throughout life-supporting systems), can facilitate this integration. The problem of accumulating material waste is used as a vehicle to focus the discussion.To this end, the foundation of the work is an experimental study into the development of a starch based biodegradable plastic packaging film. The two main constraints on sample production were to minimise cost and maximise biodegradability. Slit die rheological data is gathered for five samples selected from polymer extrusion trials as part of describing their viscous behaviours via a semi-empirical model incorporating die temperature (measured at 120, 140 and 160°C) and shear rate (altered by screw speeds of 5-50 rpm).The samples differ in additive content and extrusion passes from a baseline starch/water/glycerol (~73/18/9.0 wt% total) combination extruded once to the addition of cross-linking agents and surface modifiers (<1 wt% total) extruded twice. GPC, DSC, tensile strength and moisture absorption analyses join the rheological data to explain The experimental study represents a typical analytical approach to developing a technical solution. Yet while technology will remain indispensable to problem solving, there is a iii need to realise that splintering knowledge into disciplines of the ever finer detail required to extend technical accomplishment, must also be complemented by a synthesis of associated facts and relevant theories to address more encompassing problems associated with sustainability of the modern industrial economy. Therefore, considering the relative success of modelling the viscous behaviour of the starch based plastic samples, it was proposed to extend the concepts of rheology used to explain the flow of matter on the molecular scale to the flow of matter on the scale of the industrial economy.To whatever extent possible, the advantages of being able to predict how such flows respond to industrial economic decisions would contribute to the research of sustainable systems.The assumption is made here that an apt mate...

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Starch

Cai

Alee

Duan

et al. 2021

Encyclopedia of Polymer Science and Technology

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Starch, among the other biopolymers, is a very appealing biopolymer, due to its abundant supply, intrinsic biodegradability, and yearly renewability. Because they are inexpensive substances and are flexible to be handled using ordinary machines of plastic processing, starches make an appealing low cost basis for novel biodegradable polymers. Meanwhile, the well‐known concerns of fossil fuel scarcity and the rising demand of reducing the pressure on the environment caused by the widespread usage of petrochemically produced polymers, the production, and uses of starch‐based materials that are biodegradable have attracted a lot of attention. This article begins with a discussion of starch structures in general, including both physical and chemical features. Then, starch‐based material thermal processing is explained, which covers both basic sciences such as phase transition, rheology, and microstructure and processing methodologies, formulations, and circumstances. The multiphase transitions and distinct microstructure during heat processing make starch an excellent prototype system for illustrating and conceptualizing structure–processing–property connections in polymers. For processing starch‐based materials, several traditional methods, for example, injection compression molding, casting, and extrusion and few novel processes such as reactive extrusion have also been applied. Finally, the current advancements in starch‐based materials have been explained.

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Rheological behaviour of low moisture molten maize starch

Cited by 121 publications

References 13 publications

Network development during shear-thickening in semidilute solutions of gently solubilized starches

Network development during shear-thickening in semidilute solutions of gently solubilized starches

A conceptual model of a sustainable system based upon observations of biodegradable plastic packaging film experiments and material flow

Starch

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