Biocomposite from polylactic acid and lignocellulosic fibers: Structure–property correlations

Faludi, Gábor; Dora, Gábor; Renner, Karl; Móczó, János; Pukánszky, Béla

doi:10.1016/j.carbpol.2012.11.006

Cited by 60 publications

(30 citation statements)

References 45 publications

(55 reference statements)

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“…According to the figure the processing of TPS/lignocellulose demands more energy with increasing fiber content and aspect ratio, respectively. Previous studies on wood reinforced composites have proved that aggregation rarely occurs, but fibers might touch each other and thus hinder their mobility, which stems purely from geometric reasons [49][50][51][52], and long fibers may even form a loose network [53,54]. Thermoplastic Starch/Wood Composites 2018 62 2 …”

Section: The Effect Of the Particle Characteristics Of The Fibers On mentioning

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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Section: The Effect Of the Particle Characteristics Of The Fibers On mentioning

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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“…It is reasonably large for the relatively stiff PLA already in the neat polymer and increases even further upon coupling. The figure also shows that and fiber fracture as the dominating local deformation process [9,18,[52][53][54]. Initiation strain and thus also initiation stress increases [39] with increasing MAPLA content indicating better stress transfer at larger amount of coupling agent.…”

Section: Properties and Reinforcementmentioning

confidence: 99%

Modification of interfacial adhesion with a functionalized polymer in PLA/wood composites

Csikós

Faludi

Domján

et al. 2015

European Polymer Journal

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Maleic anhydride (MA) grafted poly(lactic acid) (PLA) coupling agents (MAPLA) were prepared by reactive processing. The amount of peroxide initiator and MA was changed in a relatively wide range. Coupling efficiency was checked in PLA/wood composites as a function of grafting degree, coupling agent and wood content. The analysis of the results showed that chain scission takes place in PLA during reactive modification. The occurrence of grafting could not be proved by FTIR spectroscopy, but a detailed NMR analysis showed that the degree of grafting depends on the amount of both reactants; a maximum of 2.5 MA groups/PLA chain could be grafted under the conditions used in the study. The functionalized polymer proved to be an efficient coupling agent in PLA/wood composites. Efficiency increased with increasing number of functionality and coupling agent amount. Coupling resulted in increased strength and reinforcement.Acoustic emission analysis of deformation processes supported by microscopy proved that the dominating local deformation process is the fracture of the fibers, but small extent of debonding also occurs in neat, uncoupled composites. The prevention of debonding by coupling resulted in the improved performance of the composites. Local processes initiate the immediate failure of the composite irrespectively of their mechanism.

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“…With the growing environmental awareness and shortage of natural resource, biodegradable and compostable materials are produced and used in increasing amounts in the areas of life and industry [1,2]. Therefore, the development of biocomposites based on biodegradable thermoplastic starch (TPS) and natural fibers is being widely explored, as an effort to reduce the plastic waste problem.…”

Section: Introductionmentioning

confidence: 99%

Effect of compatibilizer on morphological, thermal and mechanical properties of Starch-Grafted-Polypropylene/Kenaf fibers composites

Eszer

Ishak

2018

IOP Conf. Ser.: Mater. Sci. Eng.

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Abstract. Starch-grafted-polypropylene (starch-g-PP)/kenaf fibres composites were prepared by melt compounding and compression molding. Polypropylene-grafted-maleic anhydrides (MAgPP) were added at different weight contents (1, 3 and 5 wt. %) as compatibilizer. The morphological, thermal and mechanical properties of the composites were characterized using thermogravimetric analysis, scanning electron microscopy, tensile and flexural test. The results indicated that mechanical properties of the composites were improved by addition of compatibilizer. From TGA, the thermal stability of the composites with MAgPP was improved compared with the composites without MAgPP. Finally, scanning electron microscopy of fractured surface revealed better adhesion between the fibers and matrix with presence of compatibilizer.

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Biocomposite from polylactic acid and lignocellulosic fibers: Structure–property correlations

Cited by 60 publications

References 45 publications

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

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

Modification of interfacial adhesion with a functionalized polymer in PLA/wood composites

Effect of compatibilizer on morphological, thermal and mechanical properties of Starch-Grafted-Polypropylene/Kenaf fibers composites

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