Thermosetting plastics, Mechanical Engineering

Assignment Help:

Q. What do you mean by Thermosetting plastics?

This plastic undergoes a number of chemical changes on heating and cure to infusible and practically insoluble articles. The chemical change is not reversible thermosetting plastics do not soften on reheating and can not be reworked. They rather become harder due to completion of any left-over polymerization reaction. Eventually, at high temperatures, the useful properties of the plastic get destroyed. This is called degradation. The commonest thermosetting plastics are: alkyds, epoxides, polyesters, phenolics and urea.


Related Discussions:- Thermosetting plastics

Describe organic binders and its working, Q. Describe Organic binders and i...

Q. Describe Organic binders and its working? Organic binders: The binders are most frequently used in core making. Cereal binders are obtained from wheat, corn or rye; resins

Requirements for design structural steel, This section shall apply to the g...

This section shall apply to the general requirements for design, fabrication, erection, and testing of structural steels for supports, stairways, ladders and platforms. All stru

Kinetic inversion, kinetic Inversion In a mechanism, in a kinematic cha...

kinetic Inversion In a mechanism, in a kinematic chain one of the links is fixed. One can get different mechanisms by fixing in different links in a kinematic chain. This techn

Centrifugal air compressor, Centrifugal air compressor: A centrifugal...

Centrifugal air compressor: A centrifugal air compressor delivers 15Kg of air per minute. The outlet and inlet conditions are At inlet: Velocity = 5m/sec, enthalpy = 5KJ

Projectles on an inclined plane, a misile is fired at speed v and an angle ...

a misile is fired at speed v and an angle m that is inclide at an angle r to the horizontal.calculate the range

Equipment for resistance welding-single phase vs three phase, EQUIPMENT FOR...

EQUIPMENT FOR RESISTANCE WELDING-Single phase vs three phase The resistance welding machines can be connected either across 440 V mains (across two lines) or three phase mains.

the centripetal force acting on the ball, A child is twirling a 0.0106 kg ...

A child is twirling a 0.0106 kg ball on a string in a horizontal circle whose radius is 0.096 m. The ball travels once around the circle in 0.540 s. (a) Determine the centripeta

Switch assembly, Switch Assembly: A switch assembly consists of four ...

Switch Assembly: A switch assembly consists of four rails. The two outer rails are known as the stock rails. The two inner rails are called tongue rails. One stock rail and o

Determine the stress in steel rod, A steel rod of 3 cm diameters and 5 m lo...

A steel rod of 3 cm diameters and 5 m long is connected to two grips and the rod is maintained pull exerted when the temperature falls to 30 o C if (a) The ends do not yield, an

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd