Preparation and characterization of starch/EVA composite foams with surface modified kaolin

Zheng, Yang; Zhang, Youfang; Zhang, Lihong; Liu, Yi; Zhou, Qian

doi:10.1002/star.201200245

Cited by 10 publications

(8 citation statements)

References 12 publications

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“…This was caused by the increased viscosity of the systems that prevented their expansion. Similar effects were produced by addition of modified kaolin and calcium carbonate, as reported by Zheng et al and Glenn et al , respectively.…”

Section: Resultssupporting

confidence: 83%

“…However, starch foams have some drawbacks such as poor mechanical properties, fragility, and ability to adsorb water . Various fillers have been used to improve the properties of starch foams such as addition of fibers , clay , proteins , wax , ethylene‐vinyl acetate copolymer (EVA) , and calcium carbonate . However, the hydrophilic characteristics of the starch foam can cause incompatibility with some hydrophobic fillers and they are also prone to aggregate during the foam production process.…”

Section: Introductionmentioning

confidence: 99%

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Preparation of native cassava starch and cross‐linked starch blended foams

et al. 2014

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Starch foams from native cassava starch/cross-linked starch blends were prepared by baking in a hot mold. The native cassava starch/cross-linked starch ratio was varied in the series of 100/0, 80/ 20, 60/40, 50/50, 40/60, 20/80, and 0/100. The effect of the native cassava starch/cross-linked starch ratio on the properties of foams including density, morphology, water adsorption, impact strength, and thermal stability was investigated. The blending of cross-linked starch resulted in a higher density of the foams. The impact strength of the blend foams were between 232 and 268 J/m 2 . The adsorption of water by the modified starch (7.3%) and the blend foams (11-12%) was lower than for the native cassava starch foam (13.9%). The size of the cells in the blend starch foam was between the cell size of the native cassava starch and the cross-linked starch foams.

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Section: Resultssupporting

confidence: 83%

Section: Introductionmentioning

confidence: 99%

Preparation of native cassava starch and cross‐linked starch blended foams

et al. 2014

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“…6 Ji et al studied the addition of Inorganic powders such as ZnO to Eva foams as filler and found that inorganic additives strongly influenced the nucleation during foam formation, considerable changes in pores structure and mechanical properties. 7 Graphite, 8 kaolin, 9 starch, 10 lignin, 11 and other materials are also used as additives in powder form to improve properties of EVA foams.…”

Section: Introductionmentioning

confidence: 99%

Impact of hollow glass microsphere addition to poly(ethylene vinyl) acetate foam on mechanical properties of sports footwear

Lunchev

Kashcheev²,

Tok

et al. 2023

J of Applied Polymer Sci

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Samples of ethylene vinyl acetate (EVA) co‐polymer foams in form of plates and industrial outsoles of prototyped sport shoes containing 0% (reference), 2.5%, and 5.0 weight % (wt%) of hollow glass microspheres (HGM) were made. The goal was to study the influence of HGM on properties of EVA foam in laboratory conditions followed by the industrial trial, where the most promising laboratory result was applied. The physical properties of samples and behavior of material under dynamic load were examined. EVA foams with HGM filler demonstrated that they have better ability to reduce impact peak force and increase absorb impact impulse compared to the reference foam without HGM. Addition of 5.0 wt% of HGM in laboratory foam increased its absorbed impact pulse by two‐fold. Meanwhile for industrial prototype outsoles, the impact peak force was reduced by 5%–7% in walking simulated conditions and by 11% in case of simulated running. It is also observed that, addition of 5.0 wt% of HGM in EVA foam increased its abrasion resistance by three times, which generally helps to increase the lifetime of sport footwear. Under dynamic load, samples with the addition of HGM behave interestingly and result shows a small decrease in energy return (7%) which is logical, because this composite tends to absorb energy and not return it. Samples with 2.5 wt% HGM are stiffer than reference until 40% compression deformation, but beyond that point it becomes softer, and better absorbs impact energy than reference. Outsole with 2.5% of HGM in EVA outsole increased resistance of shoe at lateral bending of 50% and 20% rise of resistance was found at medial twist. Impact absorption and flexibility resistance are useful for protection against impact which are also helpful to prevent sport injuries. The obtained results show the addition of HGMs which are cheap by‐products in several technologies brings improvement to properties of EVA foams which is the most common materials for the sport footwear industry.

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“…The challenge to produce PP/Kaol composites with desirable properties is the low compatibility between the interfaces polymer‐clay . The use of silanes couplings agents can be employed to improve this compatibility . The effects of the silane on the interfacial properties are determined by its molecular structure that interacts with the polymer matrix by means of hydrogen bonds or van der Waals forces .…”

Section: Introductionmentioning

confidence: 99%

Thermal, mechanical, and water vapor barrier behavior of polypropylene composite containing modified kaolinite

Albach

Munaro

Santos

et al. 2017

J of Applied Polymer Sci

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Polypropylene composites containing modified kaolinite were prepared using melt processing and the morphological, thermal, mechanical and their water barrier properties were analyzed. To improve compatibility with polypropylene, kaolinite was modified with silane as a coupling agent. Characterization techniques (X-ray diffraction, Fourier transform infrared spectroscopy, and X-ray photoelectron spectroscopy) confirmed the effective grafting of these compounds on the surface and edges of the kaolinite with no functionalization on the inner surface. The differential scanning calorimetry and X-ray diffraction techniques demonstrated that the addition of grafted kaolinite affected the iPP crystallinity. The thermogravimetric analysis helped to determine the thermal stability of the composites, being this, dependent on the amount of kaolinite and silane. The stress-strain tests demonstrated an increase in Young's modulus and obtained a 70% reduction in water vapor permeation. These improvements were mainly related to the increased compatibility between the iPP/Kaol interfaces promoted by the silane.Kaol is a dioctahedral lamellar aluminosilicate with molecular formula Al 2 Si 2 O 5 (OH) 4 . 21 This 1:1 clay mineral is very stable, Additional Supporting Information may be found in the online version of this article.

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Preparation and characterization of starch/EVA composite foams with surface modified kaolin

Cited by 10 publications

References 12 publications

Preparation of native cassava starch and cross‐linked starch blended foams

Preparation of native cassava starch and cross‐linked starch blended foams

Impact of hollow glass microsphere addition to poly(ethylene vinyl) acetate foam on mechanical properties of sports footwear

Thermal, mechanical, and water vapor barrier behavior of polypropylene composite containing modified kaolinite

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