Lecithin modified kapok fiber/hydroxypropyl methylcellulose/graphite composites
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2023
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CONGRESSO BRASILEIRO DE POLIMEROS, 17.
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Natural fibrous materials are interesting for sustainable building construction materials1.
In this work, kapok fibers (KF) were modified with soy lecithin (SL) to enable the compatibilization
with hydroxypropyl methylcellulose (HPMC). KF, which are hollow hydrophobic fibers (Fig. 1a),
turned hydrophilic after the modification with SL (Fig. 1b), which contains two hydrophobic chains
and a zwitterionic (PO4
3- and NH4
+) head group. Elemental analysis (CHN) and FTIR-ATR spectra
evidenced the presence of SL on the surface of KF. Composites of KF-LS (72 wt%) and HPMC
(28%) presented mean apparent density (ρ) of 0.051 ± 0.005 g/cm³. When the amount of HPMC
was kept constant, but KF/LS was partially substituted by graphite (G), the composites HPMC/KFLS/
G0.2 (28 wt% /59.4 wt% /12.6 wt%) and HPMC/KF-LS/G0.3 (28 wt% /56 wt% /16 wt%) (Fig.
1c) presented ρ values of 0.059 ± 0.002 g/cm³ and 0.058 ± 0.009 g/cm³, respectively. The
thermogravimetric analysis (TGA) showed that the temperature of degradation increased from 306
ºC (HPMC/KF-LS) to 312 ºC (HPMC/KF-LS/G0.3), and the ash content increased from 10%
(HPMC/KF-LS) to 22% (HPMC/KF-LS/G0.3). The sound absorbance coefficient of HPMC/KF-LS
increased as the frequency increased, achieving a maximum value of 0.45 at 1500 Hz, which is like
other natural fibers1. These findings indicted that the novel HPMC/KF-LS/G composites could be
applied as green building materials.
Como referenciar
SANDRINI, DAIANA M.F.; KRISHNASAMY, BALAJI; PILLIS, MARINA F.; PETRI, DENISE F.S. Lecithin modified kapok fiber/hydroxypropyl methylcellulose/graphite composites: thermal and acoustic properties. In: CONGRESSO BRASILEIRO DE POLIMEROS, 17., 29 de outubro - 2 de novembro, 2023, Joinville, SC. Resumo... São Carlos, SP: Aptor Software, 2023. p. 1288-1288. Disponível em: https://repositorio.ipen.br/handle/123456789/47933. Acesso em: 30 Dec 2025.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.