K. M. Idriss Ali

Degradable jute plastic composites

A urethane prepolymer with an aliphatic chain, has been used to prepare a number of formulations, in the presence of plasticizers and monomers of different characteristics. Hessian cloth (jute product) is coated with these formulations and cured under u.v. radiation. Tensile properties (strength and elongation) of the jute plastic composite, thus formed with these formulations were found to increase. The treated jute products (composites) were buried in soil, semi-mud, mud and water in order to study the degradable character of the composite. It was found degradable in mud while the composite was not decomposable in water and soil. The composite was also treated under the simulated weathering conditions by alternating sunshine, and condensation and it was found that the composite was substantially decomposed under this condition.

Jute composite with MMA by gamma and UV radiations in the presence of additives

Jute yarns treated with MMA + MeOH solutions were irradiated either with Co-60 gamma source or with UV radiation. In gamma radiation, polymer loading of MMA (methyl methacrylate) onto jute increased quite substantially, but the strength of the composite decreases sharply after 15% polymer loading. The gamma-treated jute samples were very brittle. On the other hand, jute yarns irradiated in situ under UV radiation was found to be grafted with MMA. The tensile strength of the UV-cured jute yarn composite increases with an increase of grafting level, in contrast to the behavior observed with the gamma-irradiated jute composite samples. The tensile properties of the composites can be further enhanced by the incorporation of certain additives and coadditives into MMA + MeOH solutions. This opens diverse applications for jute materials.

In situ jute yarn composite with HEMA via UV radiation

Jute yarns soaked for 30 min in 2-hydroxyethylmethacrylate (HEMA) + MeOH solutions at different proportions [1–20% HEMA in MeOH (v/v)] were irradiated in situ with a UV lamp for different periods. The treated jute yarns that were washed in acetone after the irradiation to remove the unused excess monomer HEMA gained about 10% polymer loading with enhanced tensile strength (80%) and elongation (95%). The tenacity was not further increased by incorporation of a minute amount (1%) of novel additives into the HEMA + MeOH solutions, but elongation was enhanced up to 140% when the additive urethane acrylate (1%) was mixed with the solution.

Radiation-induced jute-plastic composite : Preparation and IR studies

Abstract Jute–plastic composite (JPC) has been prepared with tossa jute yarns and methylmethacrylate (MMA) mixed with methanol at different proportions using Co-60 gamma source irradiation. Incorporation of a minute amount (1%) of an additive like NVP, TPGDA, TMPTA, or urea substantially increased the grafting of MMA onto jute yarns. Different characteristic properties such as grafting, tensile properties, water absorption ability, and moisture absorption at different relative humidities have been determined. Both tensile strength (TS) and elongation (E b) of the composite decreased with increased grafting; however, at lower grafting, both TS and E b slightly increased. IR study reveals that MMA has been grafted onto jute cellulose at the sites of OH groups of the jute cellulose backbone.

Mechanical studies of methyl methacrylate treated jute and flax fibers under UV radiation

Jute and flax fibers were improved under UV radiation using methyl methacrylate (MMA) mixed with methanol (MeOH). There was a 30% enhancement of tenacity for these fibers against 3–8% grafting of MMA with the fibers. Incorporation of 1% of one of the additives 2-ethyl hexyl acrylate (EHA), urea (U), or N-vinylpyrrolidone to MMA + MeOH solution increased the grafting very slightly and enhanced the tenacity of jute by 110% and flax by 50%. Enhancement of elongation of the treated fibers was up to 30%.

Study of wood plastic composite in the presence of nitrogen containing additives

Abstract Effect of nitrogen-containing additives in the study of wood plastic composites of MMA with simul and mango wood of Bangladesh has been investigated. Nine different additives were used and the additives containing carboamide group induce the highest tensile strength to the composite.

Ultraviolet curing of epoxy coating on wood surface

Different formulations were developed with EB-600 (Ebcryl-600), an epoxy acrylate oligomer in the presence of N-vinylpyrrolidone and trimethylol propane triacrylate. Thin films were prepared with these formulated solutions under ultraviolet (UV) radiation. These solutions were coated on a low-grade wood substrate (simul) and cured under UV light. Both UV-cured thin films and surface coatings were characterized, and the best formulations for coating wood surface were evaluated.

Study on physical and mechanical properties of biopol-jute composite

Abstract A Biopol-jute composite (BJC) was prepared using a hot-press treatment by reinforcing the Biopol polymer with hessian cloth (jute fabrics) placed in between the layers of Biopol polymer films. Both the tensile and bending strengths of the composite increased substantially, in comparison to the pure Biopol. Jute fabrics were treated with different additives to improve the composite properties. Among them, 2-ethyl hexyl acrylate (3%), γ-rnethacryloxypropyltrimethoxy silane (2%), and trimethoxy vinyl silane (0.5%) were found to be effective in enhancing tensile properties up to 80% with respect to Biopol. Mixed additives increased the tensile properties of the composites to some extent but not as much as the single additive did.

Study on jute material with urethane acrylate by U.V. curing

Abstract Twenty different formulations were developed with urethane acrylate in the presence of different additives and co-additives. These formulations were applied to prepare different polymer films under u.v. radiation. Physical and mechanical properties of these cured films were studied. Jute material (hessian cloth) was coated with these formulations and cured under u.v. radiation. Different properties such as degree of polymer uptake, tensile properties, water absorption ability and degradability were studied. It was observed that the treated jute materials gained up to 97% polymer uptake, 115% tensile strength and 60% elongation over the untreated jute materials. The material behaved as a synthetic polymer with respect to durability in rain, water and soil. However, it was completely degraded by burying the materials in mud that contains 30% water.

Improvement of Jute Yarn Through In Situ Copolymerization by UV Radiation

Abstract Methylmethacrylate (MMA) has been copolymerized in situ under ultraviolet (UV) radiation with jute yarn in the presence of MeOH used as swelling solvent. Effect of additives such as functional monomers, urea, and plasticizer on the improvement of rheological properties of the jute yarn has been studied. Tensile strength was enhanced by 58% while elongation of the treated yarn increased by 69%. These results were compared with those obtained under gamma irradiation. It was found that the UV radiation induced better properties in yarn.