<span style="font-size:11.0pt;line-height:115%; font-family:"Calibri","sans-serif";mso-ascii-theme-font:minor-latin;mso-fareast-font-family: "Times New Roman";mso-fareast-theme-font:minor-fareast;mso-hansi-theme-font: minor-latin;mso-bidi-font-family:"Times New Roman";mso-ansi-language:EN-US; mso-fareast-language:EN-US;mso-bidi-language:AR-SA">Viscosities and partial molar volumes of [(CH₃)₄N]₂·HgCl₄ in dioxane-water mixtures</span>

314-316<span style="font-size:11.0pt;line-height:115%; font-family:" calibri","sans-serif";mso-ascii-theme-font:minor-latin;mso-fareast-font-family:="" "times="" new="" roman";mso-fareast-theme-font:minor-fareast;mso-hansi-theme-font:="" minor-latin;mso-bidi-font-family:"times="" roman";mso-ansi-language:en-us;="" mso-fareast-language:en-us;mso-bidi-language:ar-sa"="">The viscosities and partial molar volumes of bis- (tetra methyl ammonium) mercuric tetra chloride in dioxane-water mixtures of various compositions in the temperature range 298-318 K have been measured. The experimental results of viscometry have been analyzed using the Jones-Dole equation. Impact of solute on viscosity is studied in terms of Gruenberg-Nissan parameter <span style="font-size:11.0pt; line-height:115%;font-family:" calibri","sans-serif";mso-ascii-theme-font:minor-latin;="" mso-fareast-font-family:"times="" new="" roman";mso-fareast-theme-font:minor-fareast;="" mso-hansi-theme-font:minor-latin;mso-bidi-font-family:arial;mso-ansi-language:="" en-us;mso-fareast-language:en-us;mso-bidi-language:ar-sa"="">(d'). Mechanism of viscous flow has been studied in the light of activation parameters. Apparent molar volumes (φV) of this electrolyte at different concentrations have been estimated using Masson's equation.</span

Fabrication of low cost thermomechanical analyser (TMA)

663-666Fabrication of low cost thermomechanical analyser(TMA) which is one of the versatile instrument required for determination of glass transition temperature (Tg) of polymer is reported. The cost reduction during fabrication is so extensive that the entire cost of the instrument can be as low as Rs 6000/- which makes it in fact, affordable for any college

Thermal reorganisation reactions-I: Thermal cyclization of eleostearates

Intramolecular thermal cyclization of methyl α- (or β)-eleostearate has been achieved in good yield by the tactical use of sulphur as catalyst. Under relatively mild conditions (~160°), the primary cyclic monomer (methyl cycloeleostearate-I) has been obtained and unambiguously shown to be methyl 5-butyl-1,3-cyclohexadiene-6-caprylate (IV). Under more energetic conditions (~240°) isomers V and VI are formed at the expense of the primary cyclic monomer (IV)

Ring opening polymerization of ethylene carbonate with base as initiator

364-366The study presents synthesis of industrially important polymer, polyethylene ether carbonate, via ring opening polymerization of ethylene carbonate using KOH as initiator at 200°C for 7 h. The molecular weight (1200-3400) and yield (40-80%) of the polymer were determined. The structure analysis using IR and NMR techniques showed the presence of carbonate and ether linkages in the polymer

Studies on the effect of silane coupling agent (2.0 per cent) on the mechanical properties of flyash filled polybutadiene rubber

603-609Flyash, a waste product of thermal power stations, generated in huge quantities has been posing problems of its disposal.As such it contains a variety of inorganic oxides and is available in finely powdered form. Attempts have been made for its utilization, as filler in elastomers and plastics. It is important to note that, flyash in untreated form does not contribute in enhancing mechanical properties of composites significantly. In this work, flyash treated with silane coupling agent (Si-69) is used as a filler in PBR. The comparison of properties of composites filled with treated and untreated flyash revealed that the composites with treated flyash showed better reinforcing properties. Flyash treated with silane coupling agent gave greater reinforcement than untreated flyash. The treatment resulted in enhancement of mechanical properties of composites of the said rubber. In this work, properties of composites filled with treated and untreated flyash (separately) are compared. The properties under consideration were tensile strength, modulus at 100 per cent, and 400 per cent, Young’s modulus, hardness, etc. Tensile strength was improved by 193 per cent while modulus at 400 per cent was improved by 700 per cent. Young’s modulus was also improved by 170 per cent

PU Dispersions - Effect of Glycol in Polyol Moiety on the Properties of PU Coatings

1020-1023Polyurethane dispersions are binary colloidal systems having PUR particles dispersed in aqueous phase, which can be classified into anionic, cationic, and non-ionic systems, In this paper, PUR ionomers prepared by anionic dispersions process, using toluene di-isocynate [TDI], polyester polyol, and trimelletic anhydride [TMA] as the potential ionic center with NMP as the co-solvent are discussed. A series of polyols based on various glycols have been prepared while keeping the composition of the reactants the same. It is found that the dispersion prepared by a polyol containing neopentyl glycol [NPG] gives better results of a coated film with respect to gloss, scratch resistance, flexibility, and abrasion resistance.</span

Thermal reorganisation reactions-II: Thermal cyclization of methyl kamlolenate

Sulphur-catalysed intramolecular thermal cyclization of conjugated trienes, discovered with methyl eleostearate, has now been extended to its ω-hydroxy analogue, viz. methyl kamlolenate. The primary cyclic monomer (III) has been isolated and characterised. Two cyclokamlolenate-derived macrocyclic lactones (Vl) and (VII) have also been prepared

Studies on effect of titanate coupling agents on the mechanical properties of clay and talc filled styrene butadiene rubber

679-683Effect of titanate coupling agent on clay and talc has been studied with polybutadiene as a matrix. Tensile properties were measured on a computerized UTM using ASTM procedure. Comparison of properties of composites filled with treated and untreated fillers established that treatment of fillers imparts better reinforcing properties. The properties under consideration were tensile strength, modulus (100% & 400%), Young’s modulus, hardness, etc. Improvement in properties for clay and talc respectively were as follows: Tensile strength, 14, 19; Modulus (400%), 140, 90%; and Young’s modulus, 275, 25%.</b

Microwave assisted solvent-free o-alkylation and acylation of thymol and geraniol using fly ash as solid support

817-820Study includes solvent-free acylation and alkylation of two monoterpenoid molecules, thymol and geraniol, using fly ash as a solid support