Damping of the Woodwind Instrument Reed Material Arundo donax L

AUTOR(ES)

Weidenfeller, Bernd, Lambri, Osvaldo Agustín, Bonifacich, Federico Guillermo, Arlic, Uwe, Gargicevich, Damian

FONTE

Mat. Res.

DATA DE PUBLICAÇÃO

04/06/2018

RESUMO

The viscoelastic properties (E', G', tanΦ, δ) of Arundo donax (AD) and a polypropylene-beech fiber composite (PPC) were measured from RT to 580K for various frequencies and strains. E' of AD varies between 5250-6250MPa depending on ageing at RT while E'(RT)=2250MPa of PPC is signifcantly lower. E' of the AD is higher than E' of PPC in the whole investigated temperature range with the exception of AD after a heat treatment up to 575K. Damping spectra exhibit peaks around 340K (Q=234kJ/mol) and 415K for the PPC related to relaxations in the crystalline part of polypropylene and the relaxation at melting temperature. For AD damping peaks were found at 350K (Q=320kJ/mol) related to the glass-rubber transition of lignin, at 420K due to a reorganization in the amorphous phase of lignin, at 480K related to micro-Brownian motions in the non-crystalline region of cell-wall polymers and reduction of the crystallinity of cellulose, and at 570K due to the polymeric compounds of wood and/or a decomposition of lignin. The course of E' and tanΦ of AD and PPC is comparable from 20-200Hz, whereas tanΦ of AD is lower than tanΦ of PPC while E' of AD is higher than E' of PPC.

Documentos Relacionados

• Rendimento de biomassa da cana-do-reino (Arundo donax L.).
• Lectina dos rizomas de Arundo Donax L.: purificação,caracterização, propriedades,imuno-histoquímica e separação das isoformas
• Walter Reed Material
• Propagação assexuada da cana-do-reino (Arunda donax L.)
• Depuration Times of Donax trunculus and Tapes decussatus