Microstructure and physical properties of thermoplastic corn starch foams as influenced by polyvinyl alcohol and plasticizer contents

Kahvand, Fatemeh; Fasihi, Mohammad

doi:10.1016/j.ijbiomac.2020.04.222

Cited by 25 publications

(22 citation statements)

References 38 publications

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“…The volume expansion ratio (VER), cell density (N c ) and its wall thickness (δ), as follows: [31][32][33] where p f and p p are the foam and pre-foamed densities for each sample, respectively.…”

Section: Preparation Of Tps/ps Blend Foammentioning

confidence: 99%

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Microstructural and Physical Properties of Thermoplastic Corn Starch/Polystyrene Blend Foams Affected by Different Contents and Combinations of Plasticizers

2021

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A comprehensive study was performed on thermoplastic corn starch (TPS)/polystyrene (PS) blend foam to optimize the formulation from the aspects of plasticizer content and the blend ratio. Plasticization of native starch was implemented with various contents of plasticizer (water + glycerol), 21, 23, 25 and 29%, and water/glycerol ratio of 1/2, 2/3, 3/2 and 2/1 using melt extrusion process. The in uence of plasticizer loading content and also its combination on the microstructural and physical properties of the blend foam were investigated. The morphological consideration was also carried out by scanning electron microscopy (SEM) to evaluate the distribution and regularity of the foam cells. In the following, full factorial method in Minitab software was used to optimize the formulation according to the properties. Moreover, the effect of PS content on the moisture absorption and cell structure of TPS/PS blend foam was evaluated. The addition of 20% PS to TPS caused to 6 times higher expansion ration than PS and 60 % higher than TPS, while 50 % lower moisture absorption than TPS. This combination can be a good alternative candidate for warm food packing applications.

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Section: Preparation Of Tps/ps Blend Foammentioning

confidence: 99%

“…In this work, a basic method [33] was used to determine the density of each Fx-y and its pre-foamed blend, the sample's mass divided by its volume. The densities were obtained with an average on 5 different specimens for each foam and pre-foamed sample.…”

Section: Density Measurementmentioning

confidence: 99%

Microstructural and Physical Properties of Thermoplastic Corn Starch/Polystyrene Blend Foams Affected by Different Contents and Combinations of Plasticizers

2021

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“…Many research centres have been working for years to develop and improve foam technology (Brodin et al, 2017;Chauvet et al, 2021;Jin et al, 2019;Kahvand and Fasihi, 2020). One important research aim is to strive to develop porous thin-walled structural elements and to obtain a gradient structure characterized by a varying degree of porosity along a certain cross-section.…”

Section: Foaming Agentsmentioning

confidence: 99%

“…The idea of using mixtures of polymers with biopolymers is the ability to obtain a decomposing product without losing valuable mechanical functional properties (Ashby, 2006;Kahvand and Fasihi, 2020;Kennedy and Knill, 1995;Mitrus and Mościcki, 2014). By adding hydrophobic polymers the resulting products have better water resistance and they are also more cost effective.…”

Section: Environmentally Friendly Foamed Packaging Materialsmentioning

confidence: 99%

Foamed bioplastics: a review

Combrzyński¹,

Özmen²

2021

Int. Agrophys.

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A b s t r a c t. Based on a literature review, the development and importance of foamed bioplastics in the context of conventional materials has been discussed in the paper. Raw materials, technological aspects, types of products (including a new generation of bioplastics), their advantages and disadvantages as well as user expectations are presented. Despite considerable progress, especially in the formulation of new raw material compositions, there is still a need to continue research work on the application of different techniques in the production of biodegradable porous packaging materials. It still remains the current primary goal -to produce products with physical characteristics that are comparable with those of petroleum based plastic.K e y w o r d s: physical properties, foams, porous materials, bioplastics, starch-based packaging materials

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“…Although biopolymers generally exhibit poor mechanical and thermal properties (Torres et al., 2019), multiple treatments and additives are used to prepare biocomposites that are able to substitute conventional fossil fuel‐based plastics. Several studies have developed biopolymer‐based foams with similar properties to those from EPS (e.g., Cabanillas et al., 2019; Cruz‐Tirado et al., 2019; Kahvand & Fasihi, 2020). Additionally, lignocellulosic wastes can be incorporated into the biopolymer matrix to obtain improved mechanical properties (Sari et al., 2021).…”

Section: Introductionmentioning

confidence: 99%

Environmental impact of peanut skin‐reinforced native starch foams modified by acetylation

García-Rengifo

Rojas-Bringas

De-la-Torre

et al. 2021

Environmental Quality Mgmt

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Starch foams are natural and biodegradable alternatives proposed as sustainable replacements to expanded polystyrene. Despite being recognized as eco‐friendly materials, environmental impacts associated with their production process remain poorly studied. Here, the cradle‐to‐gate life‐cycle assessment of four types of starch‐based foams (potato, cassava, corn, and sweet potato) reinforced with peanut skin was assessed and analyzed. Chemically modifying starch by acetylation may accelerate the degradation ratio and decrease its hydrophilicity, which is a common issue in packaging applications. Hence, two starch scenarios were evaluated, considering as‐prepared and acetylated starches. The environmental burden of starch foam production varied depending on the starch source due to the different agricultural and irrigation practices. By incorporating 10 wt% of acetylated starch, the environmental impact drastically increased in most categories. Additionally, the sensitivity analysis carried out with different peanut skin contents showed a limited effect under 0–30 wt% of peanut skin, suggesting that peanut production exhibits a similar environmental burden to most starches.

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Microstructure and physical properties of thermoplastic corn starch foams as influenced by polyvinyl alcohol and plasticizer contents

Cited by 25 publications

References 38 publications

Microstructural and Physical Properties of Thermoplastic Corn Starch/Polystyrene Blend Foams Affected by Different Contents and Combinations of Plasticizers

Microstructural and Physical Properties of Thermoplastic Corn Starch/Polystyrene Blend Foams Affected by Different Contents and Combinations of Plasticizers

Foamed bioplastics: a review

Environmental impact of peanut skin‐reinforced native starch foams modified by acetylation

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