Processing and Mechanical Properties of Natural Fiber Reinforced Thermoplastic Starch Biocomposites

Torres, Fernando G.; Arroyo, O. H.; Gómez, Clara M.

doi:10.1177/0892705707073945

Cited by 80 publications

(35 citation statements)

References 29 publications

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“…In order to maintain one of the most important advantages of starch, i.e. biodegradability, it is modified mostly with aliphatic polyesters and natural fibers (Avérous et al 2001;Benezet et al 2012;Chakraborty et al 2007;Huang et al 2004;Shirai et al 2013;Sreekumar et al 2010;Torres et al 2007).…”

Section: Introductionmentioning

confidence: 99%

Thermoplastic starch/wood composites: Interfacial interactions and functional properties

Müller

Renner

Móczó

et al. 2014

Carbohydrate Polymers

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Thermoplastic starch (TPS)/wood composites were prepared from starch plasticized with 36 wt% glycerol. The components were homogenized by dry-blending, extruded and injection molded to tensile bars. Tensile properties, structure, deformation, water adsorption and shrinkage were determined as a function of wood content, which changed between 0 and 40 vol% in 7 steps. The modification of TPS with wood particles improves several properties considerably. Stiffness and strength increases, and the effect is stronger for fibers with larger aspect ratio. Wood fibers reinforce TPS considerably due to poor matrix properties and strong interfacial interactions, the latter resulting in the decreased mobility of starch molecules and in the fracture of large wood particles during deformation.Strong interfacial adhesion leads to smaller water absorption than predicted from additivity, but water uptake remains relatively large even in the presence of wood particles. The shrinkage of injection molded TPS parts is very large, around 10 %, and dimensional changes occur on a very long timescale of several hundred hours. Shrinkage decreases to a low level already at 15-20 vol% wood content rendering the composites good dimensional stability.

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Section: Introductionmentioning

confidence: 99%

Thermoplastic starch/wood composites: Interfacial interactions and functional properties

Müller

Renner

Móczó

et al. 2014

Carbohydrate Polymers

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“…Most of them study the influence of fiber type and amount usually by determining properties at one or two fiber contents. All kinds of fibers have been used as filler in TPS including various forms of cellulose [6,[12][13][14][15][16][17][18][19][20][21][22][23][24], jute [18,[25][26][27], sisal [28][29][30][31][32][33], wheat straw [13], flax [23,34] hemp [13,28,35,36], cotton [13,37,38], flax [19,39], ramie [20,40].…”

Section: Introductionmentioning

confidence: 99%

Thermoplastic Starch/Wood Composites: Effect of Processing Technology, Interfacial Interactions and Particle Characteristics

Fekete

Kun

Móczó

2017

Period. Polytech. Chem. Eng.

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IntroductionRecently a growing interest has been shown in the application of biopolymers as packaging materials in order to reduce the environmental pollution caused by plastic waste and to achieve sustainable development. Starch is considered as one of the most promising biopolymers because it is readily available, cheap and biodegradable. Starch is a semicrystalline polymer and it represents the major form of stored carbohydrates in plants. Starch is a mixture of two substances composed of α-D glucopyranosyl repeating units, an essentially linear polysaccharide-amylose and a highly branched polysaccharideamylopectin. One of the major problems with granular starch is its limited processability, which can be improved by the use of plasticizers. Thermoplastic starch can be obtained by the destruction of the starch granules in the presence of plasticizers under specific conditions. Polyols such as glycerol, glycols as well as water are the most widely used plasticizers [1][2][3]. The main disadvantages of TPS are its pronounced hydrophilic character and inadequate mechanical properties. The inferior properties of TPS can be improved by the incorporation of other materials (natural fibers, nanoclays, or other biodegradable polymers) [1,2,[4][5][6][7][8][9][10][11].A considerable number of papers deal with the effect of natural fibers on the properties of thermoplastic starch. Most of them study the influence of fiber type and amount usually by determining properties at one or two fiber contents. All kinds of fibers have been used as filler in TPS including various forms of cellulose [6,[12][13][14][15][16][17][18][19][20][21][22][23][24], jute [18,[25][26][27], sisal [28][29][30][31][32][33], wheat straw [13], flax [23,34] hemp [13,28,35,36], cotton [13,37,38], flax [19,39], ramie [20,40].According to the existing literature a relatively small number of papers have been published which consider the practical relevance of TPS/wood composites [7,[41][42][43][44][45][46]. There are even fewer paper about systematic experiments carried out as a function of fiber content in a wide composition range [2,41,42], furthermore, it is very difficult to find publications on the effect of processing methods on the properties of TPS/wood composites. In our earlier work we investigated different TPS/wood composites prepared by injection molding [47].

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“…The incorporation of the compatibilizer further stiffens the composite by enhancing interfacial adhesion between the matrix and RSSF particles. Interfacial adhesion prevents the RSSF particles from agglomerating and dispersing RSSF well in the matrix (Torres et al 2007;Rahman et al 2009;Nwanonenyi et al 2013).…”

Section: Mechanical Properties Tensile Propertiesmentioning

confidence: 99%

Properties of Rubber Seed Shell Flour-Filled Polypropylene Composites: The Effect of Poly(ethylene co-Acrylic Acid)

Suhaimi¹,

Ismail²

2014

BioResources

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The effect of adding poly(ethylene co-acrylic acid) (PE-co-AA) in rubber seed shell flour (RSSF)-filled polypropylene (PP) composites on processing, mechanical, water absorption, and morphological properties was studied. The addition of PE-co-AA increased the processing torque in PP/RSSF composites. Furthermore, mechanical properties such as tensile strength, flexural strength impact strength, Young's modulus, and flexural modulus show significant improvement compared to uncompatibilized composites, while elongation at break is reduced. The scanning electron microscopy (SEM) of tensile fracture specimens revealed that the dispersion of RSSF filler in the matrix improved with PEco-AA, with fewer agglomerations. Water absorption ability of the compatibilized composites was reduced due to the improved interfacial bonding, which limits the amount of water molecules to be absorbed. PEco-AA acted as a compatibilizer in PP/RSSF composites. Improvement in the properties of the composites was contributed by homogenization of RSSF particles in the PP matrix and reduction of voids and cracks due to improved interfacial adhesion and bonding between matrix and filler.

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Processing and Mechanical Properties of Natural Fiber Reinforced Thermoplastic Starch Biocomposites

Cited by 80 publications

References 29 publications

Thermoplastic starch/wood composites: Interfacial interactions and functional properties

Thermoplastic starch/wood composites: Interfacial interactions and functional properties

Thermoplastic Starch/Wood Composites: Effect of Processing Technology, Interfacial Interactions and Particle Characteristics

Properties of Rubber Seed Shell Flour-Filled Polypropylene Composites: The Effect of Poly(ethylene co-Acrylic Acid)

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