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

Compound shaft, Compoun d shaft: compoun d shaft? How is compound ...

Compoun d shaft: compoun d shaft? How is compound shaft classified?                                                               Sol.: Shaft made up of 2 or more mat

Brinell hardness test, Brinel l Hardness Test: Insert the Ball of dia...

Brinel l Hardness Test: Insert the Ball of diameter D in ball holder of machine. Make specimen surface free from dust and dirt. Make contact between the surface and ball b

Advantages and properties of alloy steel, The different advantages of alloy...

The different advantages of alloy steel are as: (a) Higher strength, toughness and hardness upon surface and over bigger cross-section. (b) Better harden-ability and retentio

Slider crank mechanism, What is the mathematical displacement equation and ...

What is the mathematical displacement equation and its derivatives?

Couple, What are properties of couple

What are properties of couple

How can we use of shrinkage allowance, Q. How can we use of Shrinkage allow...

Q. How can we use of Shrinkage allowance? Since metal shrinks on solidification and contracts further on cooling to room temperature, linear dimensions of the pattern is increa

Illustrate brinell hardness tests, Q. Illustrate Brinell hardness tests? ...

Q. Illustrate Brinell hardness tests? Brinell hardness tests of the deposited weld, and heat affected zone shall be required for procedure qualifications of every welding proce

Solve the equation by newton raphson method, Calculate root of equation 3x ...

Calculate root of equation 3x = 100 cosx + 1 by Newton Raphson method correct to three decimal places Calculate root of equation xe x = cosx by Secant method correct to three d

Welding procedure specification (wps)-variables, Variables used in WPS ...

Variables used in WPS Depending on their influence on obtaining a desired weldment, the welding variables are then classified and listed. Some of them are listed as "Essential

Determine the net rate of work output, A piston and a cylinder machine obta...

A piston and a cylinder machine obtains a fluid system, which passes through a complete cycle of four processes. In the mean while a cycle the sum of all heat transfer is 150KJ and

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