M. Monimul Huque

Physico-mechanical studies of wood fiber reinforced composites

Wood polypropylene composites (WPC) of different compositions (30, 40, and 50%) have been prepared using maleic anhydride–polypropylene copolymer of different percentage (5 and 10% relative to their wood fiber content). Tensile, flexural, fracture toughness, and impact test of the prepared WPC were carried out. From the results, it is observed that the hard wood fiber–polypropylene composites, by using maleated polypropylene (MAH-PP), show comparatively better performance to soft wood fiber–polypropylene composites. Tensile strength and charpy impact strength have been increased to a maximum of 50 and 20%, respectively. The damping index has been decreased by 60% when 10% of MAH-PP has been used. Water absorption and scanning electron microscopy of the composites are also investigated.

Physicomechanical Properties of Chemically Treated Palm Fiber Reinforced Polypropylene Composites

Palm fiber reinforced polypropylene (PP) composites were manufactured using a single extruder and an injection molding machine. Raw palm fiber was chemically treated with benzene diazonium salt to increase its compatibility with the polymer matrix. Both raw and treated palm was utilized and six levels of filler loading (10, 15, 20, 25, 30, and 35 wt%) were used during composite manufacturing. Microstructural analysis (scanning electron microscopy and Fourier transform infrared spectroscopy) and mechanical testing (tensile, flexural, impact, hardness) were conducted. Treated palm fiber reinforced composites showed better mechanical properties compared to the raw ones. Among all composites, 30% fiber-reinforced ones had the optimum set of mechanical properties.

Mechanical Properties of Polypropylene Composites Reinforced with Chemically Treated Coir and Abaca Fiber

Coir and abaca fiber-reinforced polypropylene composites were manufactured using a single extruder and an injection molding machine. Raw coir and abaca were chemically treated with benzene diazonium salt. Both raw and treated coir and abaca fibers at level of fiber loading (10, 15, 20, 25, and 30 wt%) were utilized during composite manufacturing. Mechanical tests of the resultant composites and PP were conducted. A comparison has been made between the mechanical properties of the coir and abaca fiber-reinforced composites. Chemically treated fiber-reinforced specimens yielded better mechanical properties compared to the raw composites, while coir fiber composites had better mechanical properties than abaca fiber reinforced ones. Based on fiber loading, 30% fiber-reinforced composites had the optimum set of mechanical properties.

Physico-mechanical Properties of Maleic Acid Post Treated Jute Fiber Reinforced Polypropylene Composites

During the past decade, increasing environmental awareness has renewed the interest in natural fiber reinforced thermoplastics. In current work, injection-molding method was utilized in manufacturing polypropylene (PP) composites reinforced with 20, 25, 30, and 35 wt% jute fibers. In order to increase the adhesion between the jute fiber and PP matrix, manufactured composites were post treated with maleic acid. Microstructural analysis and mechanical testing were subsequently carried out. Post treated specimens yielded better mechanical properties compared to the raw ones, while 30% fiber reinforced composites had the optimum set of mechanical properties. According to the authors, chemical modification of the PP matrix may improve mechanical properties at higher fiber content by having better interfacial bonding between the PP matrix and maleic acid post treated jute fiber.

Studies on the Physicomechanical Properties of Sodium Periodate Oxidized Jute Reinforced Polypropylene (PP) Composites

In the present work, effects of oxidation and fiber content (from 20 to 35 wt. %) on the physicomechanical properties of jute-polypropylene (PP) composites were studied. Mechanical properties (tensile strength, tensile modulus, elongation at break, flexural strength, flexural modulus, and charpy impact strength) were measured for all raw and oxidized jute-PP composites. Improved mechanical properties were obtained for oxidized jute-PP composites. Interfacial adhesion and bonding between the fiber and PP matrix were investigated by scanning electron micrograph analysis. Improved interfacial interactions and reduced water absorption were found for oxidized jute-PP composites. Water absorption tests of all composites were also performed.

Coir Fiber Reinforced Polypropylene Composites: Physical and Mechanical Properties

Coir fiber reinforced polypropylene composites were manufactured using a single extruder and an injection molding machine. Raw coir was chemically treated with benzene diazonium salt to increase its compatibility with the polypropylene matrix. Both raw and treated coir fiber was utilized and five levels of fiber loading (15, 20, 25, 30 and 35 wt%) were used during composite manufacturing. Microstructural analysis (Fourier transform infrared spectroscopy and scanning electron microscopy) and mechanical (tensile, flexural, impact, hardness and water absorption) tests were conducted. Chemically treated coir fiber reinforced specimens yielded better mechanical properties compared to the raw ones. For the fiber loaded samples, 30% fiber reinforced composites had the optimum set of mechanical properties. Authors propose that the bonding between the polypropylene matrix and chemically treated coir fiber must be increased in order to have improved mechanical properties at higher fiber content.

Comparative Studies of Some Physico‐mechanical Properties of Alkali and Diazonium Salts‐Treated Jute Fiber

Abstract The effect of diazonium salts and alkali on some physico‐mechanical properties, viz, tensile strength, tenacity, elongation at break, moisture regain, shrinkage, loss in weight, etc. of jute fiber has been studied. The tensile strength, tenacity, elongation at break, and moisture regain properties of the treated (dyed) fiber are found lower in comparison with those of raw (control) fiber. However, higher tensile strength and tenacity of the diazonium salts‐treated jute fiber are observed in comparison with those of the alkali‐treated fiber. The nature of the shades developed on jute fiber is also reported.

Studies on the Effect of Hydroxy Benzene Diazonium Salts on Physico-Mechanical Properties of Jute Fiber

ABSTRACT Jute fiber was treated with three different hydroxy benzene diazonium salts in acidic and basic media. The formation of coupling with lignin in the polymer system was observed by the infrared spectra and nitrogen content estimation. The physico-mechanical properties, viz., tensile strength, tenacity, elongation at break, moisture regain, shrinkage, and loss in weight of jute fiber were studied. The tensile strength, tenacity, and moisture regain properties of the treated fiber were found lower in comparison to those of raw (control) fiber. However, higher tensile strength and tenacity of the fiber treated with ortho hydroxy benzene diazonium salts in comparison to fiber treated with meta hydroxy benzene diazonium salts were observed. The tensile strength and tenacity of the fiber treated with meta hydroxy benzene diazonium salts were higher than those of the fiber treated with para hydroxy benzene diazonium salts. The elongation at break of the treated fiber is found greater than that of the raw fiber. The fiber treated in basic media shows higher tensile strength than that treated in acidic media. The formation of metallated azo complex compound on jute fiber was observed by infrared spectra. The nature of the shades developed on jute fiber was also reported.

Jute fiber reinforced polypropylene composite: effect of chemical treatment by benzenediazonium salt in neutral medium

Jute fiber was treated with o-, m-, and p-hydroxybenzenediazonium salts in neutral media. These modified and raw jute fibers were used to prepare jute-polypropylene (PP) composite containing 20, 25, 30, and 35% by weight fraction. Mechanical properties of composites were studied. It was found that the increase in fiber content reduces the mechanical properties of jute-PP composite. However, treated jute fiber imparts better mechanical properties to jute-PP composite than the raw jute fiber. o-Hydroxybenzenediazonium salt (o-HBDS) treated jute-PP composites are found to be the best composite from the point of view of mechanical properties.Jute fiber was treated with o-, m-, and p-hydroxybenzenediazonium salts in neutral media. These modified and raw jute fibers were used to prepare jute-polypropylene (PP) composite containing 20, 25, 30, and 35% by weight fraction. Mechanical properties of composites were studied. It was found that the increase in fiber content reduces the mechanical properties of jute-PP composite. However, treated jute fiber imparts better mechanical properties to jute-PP composite than the raw jute fiber. o-Hydroxybenzenediazonium salt (o-HBDS) treated jute-PP composites are found to be the best composite from the point of view of mechanical properties.

Studies on Metal Complex of Various Substituted Benzenediazonium Salts Treated Jute Fiber

ABSTRACT Jute fiber was treated with various substituted benzene diazonium salts in the presence of various metal salts (CuSO4, NiSO4, K2Cr2O7, and KMnO4). It was found that metal ions were incorporated into the jute fiber along with the benzenediazonium salts. The quantity of metal (Cu, Ni, Cr, and Mn) in raw and treated jute fiber was determined using Flame Atomic Absorption Spectrophotometer (FAAS). The concentration levels of the elements Cu, Ni, Cr, and Mn in the raw fiber were found below the detection limit. However, the concentration of these metals in treated jute fiber was found much higher than the detection limit and are in the following order: The physico-mechanical properties of the raw and treated jute fiber was determined. It was found that the metal ions in the presence of o-hydroxy benzenediazonium salts imparts higher tensile strength to the jute fiber than the metal ions in the presence of p- and m- hydroxy benzenediazonium salts.