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

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

Polymers, 2017, vol. 9, núm. 8, p. 377

MDPI (Multidisciplinary Digital Publishing Institute)

Author: Del Rey, Romina
Serrat, Ramon
Alba, Jesus
Pérez, Ildefonso
Mutjé Pujol, Pere
Espinach Orús, Xavier
Date: 2017 August 19
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
Format: application/pdf
Citation: https://doi.org/10.3390/polym9080377
ISSN: 2073-4360
Document access: http://hdl.handle.net/10256/14369
Language: eng
Publisher: MDPI (Multidisciplinary Digital Publishing Institute)
Collection: Reproducció digital del document publicat a: https://doi.org/10.3390/polym9080377
Articles publicats (D-EQATA)
Is part of: Polymers, 2017, vol. 9, núm. 8, p. 377
Rights: Attribution 4.0 Spain
Rights URI: http://creativecommons.org/licenses/by/4.0/es/
Subject: Fibres naturals
Fibres naturelles
Polipropilè
Polypropylene
Micromecànica
Micromechanics
Title: Effect of Sodium Hydroxide Treatments on the Tensile Strength and the Interphase Quality of Hemp Core Fiber-Reinforced Polypropylene Composites
Type: info:eu-repo/semantics/article
Repository: DUGiDocs

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