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Polymers 2017, 9(8), 377; doi:10.3390/polym9080377

Effect of Sodium Hydroxide Treatments on the Tensile Strength and the Interphase Quality of Hemp Core Fiber-Reinforced Polypropylene Composites

1
Universitat Politècnica de València, Centro de Tecnologías Físicas, Escola Politècnica Superior Gandia, Valencia 46730, Spain
2
Laboratory of Paper Engineering and Polymer Materials, Dpt. Of Chemical Engineering, University of Girona, Girona 17003, Spain
3
Departamento de Ciencias Experimentales, Universidad Pablo Olavide, Sevilla 41013, Spain
4
Design, Development and Product Innovation, Dpt. Of Organization, Business Management and Product Design, University of Girona, Girona 17003, Spain
*
Author to whom correspondence should be addressed.
Received: 21 July 2017 / Revised: 11 August 2017 / Accepted: 14 August 2017 / Published: 19 August 2017
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Abstract

The formulation of greener composite materials by substituting glass fibers with natural fibers is a current field of research. If such natural fiber reinforcements come from industrial side streams, as hemp core fibers (HCFs) come from the extraction of hemp strands for the textile industry, an additional advantage can be identified. Nonetheless, such by-product fibers show some drawbacks, such as high lignin contents, which can make it difficult to obtain a good interphase between the fibers and the matrix and to obtain a good fiber individualization. A digestion treatment at different NaOH contents is proposed to eliminate soluble lignin and extractives from the surface of the fibers. At the same time, the use of a coupling agent solves incompatibilities between the fibers and the matrix. The composites were tensile tested and the impact of the proposed treatments is evaluated and discussed. Later, the Kelly-Tyson modified equation and a modified rule of mixtures—the micro-mechanic models—is used to study the impact of such treatments on the quality of the interphase between the polymer and the reinforcement. Both treatments showed a high impact on the tensile strength and the quality of the interphase, obtaining competitive composite materials reinforced with HCFs derived from a by-product. View Full-Text
Keywords: hemp core fiber; polypropylene; tensile strength; biocomposites; micro-mechanics; Kelly–Tyson; interphase hemp core fiber; polypropylene; tensile strength; biocomposites; micro-mechanics; Kelly–Tyson; interphase
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Del Rey, R.; Serrat, R.; Alba, J.; Perez, I.; Mutje, P.; Espinach, F.X. Effect of Sodium Hydroxide Treatments on the Tensile Strength and the Interphase Quality of Hemp Core Fiber-Reinforced Polypropylene Composites. Polymers 2017, 9, 377.

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