M.M. Husain

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.

Wood plastic composite at different urea concentrations

Abstract Wood plastic composite (WPC) has been prepared with a low grade wood simul ( Salmalia malabarica ) of Bangladesh under Co-60 gamma irradiation using MMA as the bulk monomer combined with methanol as the swelling solvent at different urea concentrations. Effect of a second solute such as NVP, TPGDA and TMPTA in the impregnating solution is evaluated. NVP appears to be the best co-additive/second solute among all the additives used to yield the composite with the highest polymer loading (PL) and tensile strength (TS) at 0.5% urea concentration.

Impregnation mode in wood plastic composite

Abstract Bulk monomer MMA was impregnated into simul, a fuel wood of Bangladesh, under vacuum and under normal temperature and pressure conditions in order to compare the mode of impregnation and its effect on various characteristic parameters of wood plastic composites. Methanol (MeOH) was used as the swelling solvent with methylmethacrylate (MMA) at MMA: MeOH = 70:30, v/v. Impregnation of the bulk monomer was very high under vacuum compared to that at normal condition; but the difference of grafting of MMA to the wood cellulose under these two impregnating conditions was much lower as compared to that of the uptakes of impregnating solution MMA + MeOH under these two modes of impregnation. Incorporation of additives to MMA + MeOH has substantially enhanced grafting, tensile strength, bending strength and compression strength of thcomposite of such an extent that there is virtually very little difference between vacuum impregnation and normal impregnation. Considering the available data it is suggested that the impregnation under normal condition is preferable beacuse different substrates of various sizes and shapes can be suitably impregnated under normal condition while vacuum impregnation has several limitations in this respect.

Role of additives in wood plastic composite of water soluble monomer

Abstract Wood plastic composites are prepared under radiation of 60Co gamma source with simul, a low grade wood of Bangladesh using a water soluble monomer acrylamide (AM) mixed with a swelling solvent methanol, water or methanol/water (1:1) at different compositions in the presence of a number of additives and co-additives such as NVP (N-vinylpyrrolidone), TPGDA (tripropylene glycol diacrylate), TMPTA (trimethylol propane triacrylate), sulfuric acid, urea and copper sulfate. Polymer loading (PL) and tensile strength (TS) of the composites are measured. The role of these additives on the composites is also discussed. It is observed that nitrogen-atom containing-materials like urea, NVP and AM produce composites with the highest mechanical strength, and incorporation of copper into this system provides additional property of protection and preservation of the composites against attacks by insects and microbes.

Wood-Plastic Composite with Methylmethacrylate in Presence of Novel Additives

Abstract Wood–plastic composites (WPC) were prepared with kadom and mango wood of Bangladesh under Co-60 gamma irradiation using methylmethacrylate (MMA) as the bulk monomer mixed with methanol (swelling solvent) at different proportions in presence of a number of additives such as N-vinyl pyrrolidone, tripropylene glycol diacrylate, trimethylol propane triacrylate, copper sulfate, sulfuric acid, and urea. Composites prepared with urea, NVP, and CuSO4 possess better tensile and protective properties.

Effect of sulfuric acid in wood plastic composite

Wood plastic composite was prepared with simul and MMA in the presence of methanol used as swelling agent at different proportions. Sulfuric acid was incorporated into the impregnating solution to investigate its effect on the polymer loading and tensile strength of the composite. 1% Acid solution induces the highest polymer loading. Effect of additives like NVP, TPGDA and TMPTA was also investigated. Corrosion or leaching effect of the acid on the wood samples was studied. Uptake of the impregnating solution by the samples over a period of time was determined.

Effect of Copper Sulfate in Wood-Plastic Composites

Abstract Wood-plastic composites are prepared under Co-60 γ irradiation with simul, a low-grade wood of Bangladesh using four different bulk monomers (styrene, methylmethacrylate, butylmethacry-late, and acrylamide) at different methanol concentrations in the presence of a number of additives such as NVP, TPGDA, TMPTA, sulfuric acid, urea, and lithium nitrate. The effect of copper sulfate is studied in these systems. The optimum CuSO4 concentration for obtaining the highest polymer loadings is determined.

Chemical Constituents of Essential Oil of Petals and Corolla Tubes of Nyctanthes Arbor-Tristis Linn Flower

Abstract This is first report on the composition of the white petal and orange corolla tubes of the flower essential oils of Nyctanthes arbor-tristis Linn (Seuli) from the Dhaka city in Bangladesh. The white petal and orange corolla tubes of the flower of Seuli, extracted by water distillation processing were subjected to analysis by GC-MS. The major constituents were found to be 3,7,11,15-tetramethyl-2-hexadecene-1-ol (40.3 %) and 2-methyloctadecane (17.6 %), from petal and corolla tube, respectively. The oil confirmed the determination of 8 and 10 compound of petal and corolla tube were representing 4.50 % and 2.83 % respectively. Physico-chemical properties of the petal, corolla tube and its volatile oil were determined by standard techniques.

Wood-plastic composite in the presence of various acids

Abstract Wood-plastic composite was prepared under Co-60 gamma irradiation with kadom (Anthrocephalus) (d = 0.36 g/cm3), a soft wood of Bangladesh, and methylmethacrylate (MMA) combined with methanol in the presence of a number of organic and inorganic acids. The impregnation was made at normal conditions. Polymer loading was determined and the change of tensile and bending strengths as a result of acid was evaluated. Most of the acids decrease both tensile and bending strengths, but adipic and oxalic acids do increase both the strengths.