Write applications and properties of Phenol- formaldehyde resin
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Answer:
It may be brittle in thin sections with low impact strength. It is very easy to mould. Phenolic resin has Retain properties at freezing temperatures. The phenol formaldehyde have Improved strength and dimensional stability and Improved impact resistance and also cast resins.
In Phenol formaldehyde wide range of molding powders is available in which the composition of the resin, fillers etc is varied to provide mouldings suitable for many purposes. Here compression and transfer processes commonly used. The phenolic resin’s polarisability is 10-24cm3 and Enthalpy of vaporization is 43.52 kJ/mol. It’s polar surface area is 9.23 Å2 .It has 1 H bond donor and 1 H bond acceptor. 72.5 °C is it‘s flash point, 181.8 °C at 760 mmHg it’s boiling point and 0.614 mmHg at 25°C is it’s vapor pressure. Phenolic resin has the colour is Resin itself tends to be amber-colored. It has Wide variation depending on fillers and nature of resin. It is Smooth and has lustrous surface. Usually it seems hard and rigid, with good dimensional stability. It may be brittle in thin sections with low impact strength.
It is very easy to mould. Phenolic resin has Retain properties at freezing temperatures. The phenol formaldehyde have Improved strength and dimensional stability and Improved impact resistance and also cast resins. It’s color is good normally transparent and may be colorless It is good dimensional stability on heating up to about 300 degree F Poor conductors of heat , so that handles of pans etc stay cool to touch. It can burn only with difficulty. Age of phenolic resin is negligible deterioration. Electrical if we will verify then it is good electrical insulators, Laminated Plastics. Properties generally related to those of moulded plastics.