Functionalization of sisal fibers and high‐density polyethylene by cold plasma treatment

Abstract

ABSTRACT:Chopped sisal fibers and finely powdered high-density polyethylene were surface functionalized using dichlorosilane (DS) under radio frequency (RF)-plasma conditions and characterized by electron spectroscopy for chemical analysis (ESCA) and fluorescence labeling techniques. A high-capacity (10 L), rotating, 13.56 MHz, electrodeless plasma installation, specially designed to allow the uniform surface modification of powdery and particulate matter of irregular shape, was used. A three-factor fractional experimental design was employed to evaluate the effect of RF-power, pressure, and reaction time on the ESCA-based relative atomic composition of plasmatreated samples. It was demonstrated that OSiH x Cl y functionalities are present on plasma-exposed surfaces and these functionalization reactions can be controlled by selecting proper plasma parameters.

Grafting of softwood kraft pulps fibers with fatty acids under cold plasma conditions

“…Plasma-aided synthesis (deposition and grafting reactions) involves the fragmentation of plasma gases and the reorganization of the resulting neutral and charged species, inside and outside the plasma area, into non-volatile, high molecular weight structures. Usually, the recombination mechanisms developed in the absence of plasma (outside the plasma zone) led to the incorporation of less fragmented building blocks into the nascent macromolecular structures [37,38].…”

Caracterização química e estrutural de fibra de sisal da variedade Agave sisalana

“…Além destas aplicações, a literatura relata diversos estudos sobre a modificação da superfície das fibras com objetivo de sua utilização em materiais compósitos poliméricos de grande interesse para a indústria [1,3,7,8,10,[12][13][14][15][16][17][18][19][20] . Os compósitos reforçados com fibras de sisal se destacam por apresentarem alta resistência ao impacto, e boas propriedades de resistência à tração e flexão [3,[21][22][23][24] .…”

“…Embora na literatura, se encontrem vários estudos de compósitos poliméricos com fibras de sisal [1,3,6,9,[12][13][14][15]21,22,[24][25][26][27] , pouco se tem desenvolvido na caracterização da fibra, e em particular no que diz respeito a análises físico-químicas e morfológicas visando um maior entendimento de suas propriedades. O estudo para a determinação da composição quí-mica da fibra, realizado por Medina [5] mostrou que a fibra é constituída de 65,8% de celulose, 12% de hemicelulose, 9,9% de lignina e 0,8% de pectina.…”

Characterization and evaluation of the hydrolytic stability of trifluoroacetylated cellulose fibers

“…The modification of cellulose fibers with fluorine-containing compounds using different procedures has attracted attention in recent years because of the peculiar properties imparted by this type of functionalization, in particular the enhanced lipophobicity/hydrophobicity of the ensuing surfaces [12][13][14][15][16][17][18][19][20][21]. Our ongoing interest in this type of modification includes two types of reagents as a function of the desired application, viz.…”