Continuous Bamboo Fibers/Fire-Retardant Polyamide 11: Dynamic Mechanical Behavior of the Biobased Composite

Polymers

Gilles Hochstetter¹  Eric Dantras²  Colette Lacabanne²  Louise Lods²  Tutea Richmond²  Jany Dandurand²  Jean-Michel Durand³  Edouard Sherwood³  Philippe Ponteins⁴ 

[1] Arkema, 420 Rue d’Estienne d’Orves, 92700 Colombes, France;CIRIMAT, Université de Toulouse, PhyPol, 118 Route de Narbonne, 31062 Toulouse, France;Cobratex, 1 Allée Orchidée, Local 8—ZA Activestre, 31390 Carbonne, France;Expleo Toulouse, 13 Rue Marie Louise Dissard, 31300 Toulouse, France;

关键词: technical bamboo fibers;    bamboo fibers/thermoplastic composites;    fire retardant;    thermogravimetric analysis (TGA);    dynamic mechanical analysis (DMA);    glassy/rubbery modulus;   

DOI  :  10.3390/polym14020299

来源: DOAJ

【 摘 要 】

A biobased composite was generated from bamboo fibers (BF) and a polyamide 11 (PA11) matrix. In order to fulfill security requirements, a PA11 already containing a flame retardant (FR) was chosen: This matrix is referred as PA11-FR. In this work, the effects of flame retardant (melamine cyanurate) on the composite properties were considered. In the calorimetric study, the glass transition and melting temperatures of PA11-FR were the same as those of PA11. The melamine cyanurate (MC) had no influence on these parameters. Thermogravimetric analysis revealed that PA11-FR was less stable than PA11. The presence of MC facilitated thermal decomposition regardless of the analysis atmosphere used. It is important to note that the presence of FR did not influence processing conditions (especially the viscosity parameter) for the biosourced composite. Continuous BF-reinforced PA 11-FR composites, single ply, with 60% of fibers were processed and analyzed using dynamic mechanical analysis. In shear mode, comparative data recorded for BF/PA11-FR composite and the PA11-FR matrix demonstrated that the shear glassy modulus was significantly improved: multiplied by a factor of 1.6 due to the presence of fibers. This result reflected hydrogen bonding between reinforcing fibers and the matrix, resulting in a significant transfer of stress. In tensile mode, the conservative modulus of BF/PA11-FR reached E’ = 8.91 GPa. Upon BF introduction, the matrix tensile modulus was multiplied by 5.7. It can be compared with values of a single bamboo fiber recorded under the same experimental conditions: 31.58 GPa. The difference is partly explained by the elementary fibers’ lack of alignment in the composite.

【 授权许可】

Unknown