Study on the cationic modification and dyeing of ramie fiber

Yang, Yani; Zhang, Lili; Liu, Zhao‐Tie; Xiong, Huiming

doi:10.1007/s10570-007-9117-0

Cited by 86 publications

(42 citation statements)

References 19 publications

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“…), is a member of the Urticaceae family. Today it is mainly produced in China and several other Asian countries such as India, Philippines, Thailand and South Korea (Liu et al 2007b). Ramie produces one of the strongest and longest plant fibers which are stripped from stem bast of the plant, possessing lustrous and silky appearance.…”

mentioning

confidence: 99%

Grafting from ramie fiber with poly(MMA) or poly(MA) via reversible addition-fragmentation chain transfer polymerization

Chen

Sun

et al. 2009

Cellulose

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Reversible addition-fragmentation chain transfer (RAFT) polymerization was utilized to control the grafting of methyl methacrylate (MMA) and methyl acrylate (MA) from natural ramie fibers substrate. The hydroxyl groups of ramie fibers were first converted to 2-dithiobenzoyl isobutyrate as a RAFT chain transfer agent (CTA), which was further grafted with MMA or MA mediated by the RAFT polymerization in a presence of 2-(ethoxycarbonyl) prop-2-yl dithiobenzoate as a free chain transfer agent. Hydrophobic poly(MMA) or poly(MA) modified ramie fibers with contact angles greater than 130°were obtained. The modified ramie fibers were analyzed by gravimetry, Fourier transform infrared spectroscopy, scanning electron microscopy, differential scanning calorimetry, thermogravimetry and contact angle measurements. The results indicate that the polymer chains had indeed been grafted from the surface of the ramie fibers with an average 33% of the hydroxyl groups in the raw ramie fiber substituted by 2-bromoisobutyryl bromide and an average grafting ratio of 25% poly(MMA) or poly(MA) related to ramie fiber. The homopolymers formed in the copolymerization were also analyzed to estimate molecular weights and polydispersity indices of grafting chains from the surface of ramie fibers by size exclusion chromatography, which showed narrow polydispersity with the PDIs to be \1.32. This study provides a novel and feasible approach to the preparation of functional composite materials for utilizing the abundant natural ramie fiber cellulose resource. Keywords RAFT Á Ramie fiber Á Grafting polymerization Á Modification Á Hydrophilicity/hydrophobicity Abbreviations MMA Methyl methacrylate MA Methyl acrylate BIBB 2-Bromoisobutyryl bromide ECPDB 2-(Ethoxycarbonyl)prop-2-yl dithiobenzoate AIBN 2,2 0 -Azobis(isobutyronitrile) THF Tetrahydrofuran NMP N-methyl-2-pyrrolidone DMAP 2-(Dimethylamino)pyridine CTA Chain transfer agent TMS Tetramethylsilane RAFT Reversible addition-fragmentation chain transfer FT-IR Fourier transform infrared spectroscopy

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mentioning

confidence: 99%

Grafting from ramie fiber with poly(MMA) or poly(MA) via reversible addition-fragmentation chain transfer polymerization

Chen

Sun

et al. 2009

Cellulose

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“…The characteristic crystalline form cellulose I-shows peak at 14.95°, 16.28° and, 22.11° also the characteristic crystalline form cellulose I-shows peak at 14.05°, 16.28° and, 21.52° [14,23,24]. Crystallinity index value of HWT was found as 24.1%.…”

Section: Characterization Of Hwt Particles Xrd Analysismentioning

confidence: 82%

Bio-composites based on polypropylene filled with waste of camellia sinensis

Küçükdoğan

Öztürk

Sütçü

2016

Archives of Materials Science and Engineering

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Purpose: This study aims to examine the properties of polypropylene (PP) composites filled with household waste tea (camellia sinensis) (HWT) to development of their mechanical properties and also to gain the economic value of HWT. Design/methodology/approach: HWT was grinded using a disk mill in the finely powder form. Prepared finely tea powders were characterized compositional and morphologically by using Fourier transform infrared spectroscopy, X-Ray diffractometer and scanning electron microscope. PP composites were prepared at different proportions of HWT ranging from 0 wt% to 40 wt% with two particle sizes (<30 µm and <60 µm) by high-volume energy mixer so as to evaluate the effect of the HWT filler on mechanical properties. Findings: The mechanical properties of composites were evaluated through modulus of elasticity, ultimate tensile strength and flexural strength in terms of filler particle size and filler contents. The results showed that the modulus of elasticity of composites increased as a function of additional HWT particles and the highest value was observed which was containing 40 wt% filler contents. Research limitations/implications: Clearly, the maximum flexural and tensile strength of HWT particles filled composites were observed for 10 wt% HWT loading into PP composite increased when compared to other filler contents (20-40 wt%). Practical implications: For potential applications in the plastics industry, such as outdoor deck floors, cladding and siding, indoor furniture etc., it is desirable to form polymer composite systems by combining phases with polymer, so as to reduce expenses of materials, to have strength and, at the same time to be biodegradable. Originality/value: Despite HWT was chemically untreated, the mechanical properties of composites increased it would appear that it can be a renewable alternative material for manufacturing of PP matrix composites.

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“…In the case of the cationized cotton, large quantities of positive charges decrease the zeta potential of the fibre surfaces, which increases the sedimentation of silver particles because of the greater attractive forces between the fibres and the nanosilver . Also, the XRD patterns reveal that in modified cotton the crystalline phase decreases and, because amorphous structures have more vacancies than crystalline one, nanosilver adsorption increases Liu et al 2007). Also from the SEM micrographs it is clear that the roughness of the surfaces of the fibres increases after cationization, which leads to the presence of more voids on the surfaces of the fibres, entrapping silver particles.…”

Section: Study Of Adsorption Of Silver Nanoparticlesmentioning

confidence: 96%

Effect of cationization on adsorption of silver nanoparticles on cotton surfaces and its antibacterial activity

2009

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Cotton was cationized by exhaustion method using 3-chloro-2-hydroxypropyl trimethyl ammonium chloride (CHPTAC) as a cation-generating agent. Adsorption of silver nanoparticles on normal and cationized cotton was studied by exhaustion method at temperatures of 80°C and 100°C. Two exhaustion baths were used, containing nanosilver colloidal solutions stabilized by two different stabilizers and various concentrations of silver nanoparticles. Fourier-transform infrared (FT-IR) spectra of normal and cationized samples confirmed the existence of quaternary ammonium groups on cationized cellulose fibers. X-ray diffraction (XRD) patterns showed that crystallinity of the modified cellulose fibers was decreased. Scanning electron microscope (SEM) images revealed that the surface of the modified cotton was rougher than that of normal cotton. In addition, SEM images showed the presence of silver nanoparticles on the surface of treated fabric samples. The amount of silver particles adsorbed on the fabric samples was determined using inductively coupled plasma-optical emission spectrometer. Antibacterial tests were performed against Escherichia coli bacteria as an indication of antibacterial effect of samples. Cationized cotton samples adsorbed more silver nanoparticles and then had greater ability to inhibit bacteria.

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Study on the cationic modification and dyeing of ramie fiber

Cited by 86 publications

References 19 publications

Grafting from ramie fiber with poly(MMA) or poly(MA) via reversible addition-fragmentation chain transfer polymerization

Grafting from ramie fiber with poly(MMA) or poly(MA) via reversible addition-fragmentation chain transfer polymerization

Bio-composites based on polypropylene filled with waste of camellia sinensis

Effect of cationization on adsorption of silver nanoparticles on cotton surfaces and its antibacterial activity

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