Fabrication and mechanical analysis of mimosa tannin and commercial flax fibers biocomposites

Improving mechanical properties of novel flax/tannin composites through different chemical treatments

“…The effects of fibre pre-treatments on tensile properties (e.g tensile strength and tensile modulus) of nonwoven flax/tannin composites are shown in Figure 3. The untreated composites had tensile strength around 41.9 MPa, which is similar to the previous tensile test results of flax/tannin composites reported by Sauget and his coworkers (Sauget et al, 2013). It is clear that every fibre modification had a positive effect on tensile strength at certain level.…”

“…In the previous work, the effects of production parameters and fibre configurations on properties of flax/tannin composites have been studied by Sauget et al (Sauget et al, 2013) and Zhu et al (Zhu et al, 2012;Zhu et al, 2013a), respectively. With respect to the investigation of manufacturing techniques for nonwoven flax/tannin composites, the best mechanical result was obtained by curing at 130°C for 35 min.…”

Preparation and characterization of flax biocomposites made of seed mucilage reinforced by fibers

“…For comparison, the authors constructed other samples with compression molding but without the preliminary impregnation step. The process that most resembled the process we described was the impregnation of flax fibers with a liquid mimosa tannin/hexamine resin, with a drying step introduced after the impregnation [17]. Later, a known amount of water was added to both sides, and the composite was compression molded.…”

“…For sustainable development, eco-based resins and recyclable matrices are increasingly assayed [5][6][7][8][9][10]. Natural polyesters, such as poly(lactic acid) (PLA) [3], PLA and montmorillonite clay [11], poly(hydroxybutyrate) (PHB) [4], and poly(hydroxybutyrate)-co-hydroxyhexanoate (PHB-co-HHx) [12], and proteins, such as gluten [13] or soy protein [14], natural rubber [15], polysaccharides such as starch [16], tannin [17] and oil derived resin [18], are used as a matrix for natural fibers and for proposed bio-based polymers. The main drawback of most eco-or bio-based composites remains the disposal at end of their usefulness; the materials cannot be 100% composted so they must be crushed and recycled.…”

Tannins: Prospectives and Actual Industrial Applications

“…Nonwoven flax and hemp fiber mats were impregnated with renewable bio-sourced resin matrices to yield both high and low density composites of good performance [133,134,135,136] (Figure 17). The types of bio-sourced matrices used were: (1) a 5% hexamethylenetetramine-hardened resin based on commercial mimosa tannin extract, and (2) a 50/50 combination by weight of glyoxalated organosolv lignin of low molecular weight and of mimosa tannin with hexamethylenetetramine.…”