Calculations and Experiments for Impact Strength of Natural Long‐Fiber Reinforced Composites

Mieck, K.-P.; Reußmann, T.; Lützkendorf, R.

doi:10.1002/adem.200300564

Cited by 8 publications

(7 citation statements)

References 6 publications

(14 reference statements)

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“…Consequently, the hydrophilic nature of natural fillers reduces the adhesion to a hydrophobic matrix and, as a result, a loss in strength may be induced as showed by the results of mechanical tests reported below. The surface free energy of both the filler and the polymer is very small [45], therefore the phenomenon of stress transfer occurs in a more difficult way and the filler particles become sources of stress concentration which can lead to an accelerated breakage [46]. To prevent this phenomenon, the silverskin surface could be modified by several methods proposed in the literature, such as wax treatments [47].…”

Section: Morphological Analysismentioning

confidence: 99%

Utilization of coffee silverskin in the production of Poly(3-hydroxybutyrate-co-3-hydroxyvalerate) biopolymer-based thermoplastic biocomposites for food contact applications

Gigante

Seggiani

Cinelli

et al. 2021

Composites Part A: Applied Science and Manufacturing

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Section: Morphological Analysismentioning

confidence: 99%

Utilization of coffee silverskin in the production of Poly(3-hydroxybutyrate-co-3-hydroxyvalerate) biopolymer-based thermoplastic biocomposites for food contact applications

Gigante

Seggiani

Cinelli

et al. 2021

Composites Part A: Applied Science and Manufacturing

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“…The impact strength of NFC is maximized at the critical fiber length and increases with the fiber content and composite strength . It is possible that the algae fiber reached its critical fiber length when 0.14 υ f was processed with grafted polypropylene.…”

Section: Resultsmentioning

confidence: 99%

Algae fiber polypropylene composites: Modeling of the degradation by solid state kinetics

Constante

Pillay

2016

J of Applied Polymer Sci

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Knowledge of the mechanisms of degradation in natural fiber composites (NFCs) has great importance for the life cycle assessment of the automotive components based on NFCs. The purpose of this study was to evaluate the solid state kinetic models available to describe the degradation process of algae fiber/grafted polypropylene (AFPPg) composites processed by extrusion compression molding (ECM). Samples of the 0.14 volume fraction (t f ) AFPPg composite, algae fiber, and grafted PP were evaluated before and after 576 hours of accelerated UV light weatherization. The weight loss of the specimens was determined by thermogravimetric analysis (TGA) at six isothermal temperatures, and weight loss data were transformed into the conversion fraction a. Curves of the factor a and time were linearized using MATLAB software to find the parameters of the degradation. The best statistical fit to model the degradation was given by the Avrami-Erofe'ev model. The kinetic parameters of PP grafted after UV exposure were frequency factor (A) of 6.26 min 21 and activation energy E 0 of 24 kJ/mol. The effect of degradation was characterized by Fourier transformed infrared spectroscopy (FTIR). The characteristic bands of the main products of degradation in the composite were identified as pentane and propane.

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“…This is consistent with literature. 16,17 Impact strength of the elastomer modified composites It has been proved that elastomer (both synthetic and natural) can be used to improve the impact properties of the fiber reinforced composites. 12 Figure 7 shows the typical load-displacement curves of PP and its composites.…”

Section: Mechanical Properties Of the Unmodified And Pp-mah Compatilized Compositesmentioning

confidence: 99%

Study on mechanical properties and thermal stability of polypropylene/hemp fiber composites

Niu

Liu

Wei

et al. 2010

Journal of Reinforced Plastics and Composites

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Polypropylene and hemp fiber composites were prepared by melt compounding, followed by injection molding. Maleic anhydride grafted polypropylene (PP—MAH), maleic anhydride grafted styrene—(ethylene-co-butylene)—styrene copolymer (SEBS—MAH) and maleic anhydride grafted Poly(ethylene octane) (POE—MAH) were used as compatilizer to improve the fiber/matrix interactions. The composites were characterized by X-ray diffraction (XRD), dynamic mechanical analysis (DMA), scanning electron microscopy (SEM), mechanical testing and thermogravimetric analysis (TGA). The mechanical properties of polypropylene/hemp fiber composites (fiber loading 30 wt%) at different compatilizer content were analyzed. In comparison to unmodified system, the incorporation of compatilizer (PP—MAH, SEBS—MAH, POE—MAH) can significantly enhance the fiber/matrix adhesion which resulted in higher stiffness and mechanical properties of the composites. The combination of PP—MAH and SEBS—MAH (or POE—MAH) elastomer can be used to optimize the mechanical properties of the composites. The tensile strength, flexural strength, notched and unnotched impact strengths of the composite comprising PP—MAH (5 phr) and POE—MAH (6 phr) were 22%, 8%, 24%, and 82% higher, respectively, than that of unmodified system. Furthermore, the addition of hemp fiber shifted the start of the degradation process and the maximum decomposition temperatures of the components to higher temperatures.

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Calculations and Experiments for Impact Strength of Natural Long‐Fiber Reinforced Composites

Cited by 8 publications

References 6 publications

Utilization of coffee silverskin in the production of Poly(3-hydroxybutyrate-co-3-hydroxyvalerate) biopolymer-based thermoplastic biocomposites for food contact applications

Utilization of coffee silverskin in the production of Poly(3-hydroxybutyrate-co-3-hydroxyvalerate) biopolymer-based thermoplastic biocomposites for food contact applications

Algae fiber polypropylene composites: Modeling of the degradation by solid state kinetics

Study on mechanical properties and thermal stability of polypropylene/hemp fiber composites

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