Biocomposites reinforced with natural fibers: 2000–2010

Organic Chemistry By Dr. I. L. Finar. Vol. 2: Stereochemistry and the Chemistry of Natural Products. Pp. xi + 733. (London and New York: Longmans, Green and Co., Ltd., 1956.) 40s. net.

Advanced Organic Chemistry

In the last few decades, the usages of plant sources-based stiff fillers as reinforcement material in polymer composites have attracted significant interests of researchers. The crystalline part of the semicrystalline cellulose chains as found in the plant cell walls represents the most highly potential reinforcing agents for polymer. This review systematically covers the extraction of nano-sized cellulose crystals from plant cell wall which involving the applications of several highly effective techniques. The topic about the derivation of products functionality at each stage as well as their influences on the final reinforcing capability is also covered. Apart from these, a detailed overview of current knowledge on the surface modification of nanocellulose has been provided also. Inasmuch, this paper is desired to encourage the emergence of preparation of cellulose derivative nanocrystals with controlled morphology, structure and properties, so that enable positive development of biocompatible, renewable and sustainable reinforcing materials for polymer composites field.

Extraction of cellulose nanocrystals from plant sources for application as reinforcing agent in polymers

Electrochemical behavior of folic acid at calixarene based chemically modified electrodes and its determination by adsorptive stripping voltammetry

Evaluation of corn husk fibers reinforced recycled low density polyethylene composites

Raw jute fiber was treated with o-hydroxybenzenediazonium salt (o-HBDS) in alkaline media. Raw and modified jute fiber were used to prepare composites by mixing with polypropylene (PP) plastic in different weight fractions (20, 25, 30, and 35%) of jute fiber. The mechanical properties except elongation at break of o-HBDS-treated (in alkaline medium) jute fiber-PP composite were higher than those of PP alone, raw jute fiber-PP composites, and alkali-treated jute fiber-PP composites. The elongation at break of treated jute-PP composite decreased to a large extent as compared to that of PP. The increase of tensile strength, tensile modulus, flexural strength, flexural modulus, and Charpy impact strength were found to be exceptionally high (in some cases ~200%) as compared to those of literature values.

https://bioresources.cnr.ncsu.edu/BioRes_05/BioRes_05_3_1618_Kabir_HIB_Mechan_Prop_Jute_PP_Compos_BDS_Alk_Medium_953.pdf

Mechanical properties of jute fiber reinforced polypropylene composite; effect of chemical treatment by benzenediazonium salt in alkaline medium

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.

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

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 ...

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

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

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.

M. Alamgir Kabir

Papers

Mechanical properties of jute fiber reinforced polypropylene composite; effect of chemical treatment by benzenediazonium salt in alkaline medium

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

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

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

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