Thermal and Arc Resistance of Polyester Resin Glass Reinforced Laminates

The heat resistance of several types of polyester resins are studied by measuring the flexural strength of glass reinforced laminates before and after conditioning at 200°C. Arc resistance readings are also taken. The type of saturated acid, glycol and monomer is varied. The ratio of saturated to unsaturated acid and the ratio of monomer to base resin is also studied. Chlorendic acid improves the heat resistance over phthalic and isophthalic acids but it lowers the arc resistance. Ethylene glycol yields resins with the highest flexural strengths. Styrene monomer content has little effect on heat resistance up to 40%. In the case of phthalic and isophthalic acid, increasing the proportion of unsaturated acid increases the heat resistance. However, the chlorendic­maleic acid combination shows optimum properties at a molar ratio of three to five

A study of the replacement of the aryl amino group by hydrogen using isopropyl nitrite

The use of the amino group as a directing agent in the synthesis of many aryl compounds is a well known and often used process. Therefore a simple and efficient method of removing the amino group after it has served its purpose is to be desired. The purpose of this work has been to investigate the possibilitiy of deaminating using dilute solutions and isopropyl nitrite as a diazotizing agent. The method of reacting as well as the use of different reactants was studied