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

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

Formula for maximum power transmitted by belt, Formula for maximum power tr...

Formula for maximum power transmitted by belt: Derive formula for maximum power transmitted by belt when centrifugal tension is considered. Sol: Let T 1  = Tension on

Safety considerations for storage tanks, Q. Safety considerations for stora...

Q. Safety considerations for storage tanks? Large storage tanks are potential fire hazards and should be located at a lower elevation than other occupancies to prevent liquids

Flash butt welding, Flash Butt Welding The two pieces to be welded are ...

Flash Butt Welding The two pieces to be welded are pressed against each other by applying a pressure. To whatever finish the faces are machined, there will be some protuberance

Determine the reactions at the supports, Determine the reactions at the sup...

Determine the reactions at the supports: A smooth sphere weighing 200 N is resting as shown in Figure. Determine the reactions at the supports. Solution Let us fir

Compute the magnitude and direction of the force, Compute the magnitude and...

Compute the magnitude and direction of the force: Problem: Compute the magnitude and direction of the force F¯ = (320 N) i¯ + (450 N) j¯ - (600 N) k¯ Solution

Compute the coefficient of friction at block, Compute the coefficient of fr...

Compute the coefficient of friction at block: The frame shown in Figure rotates about a vertical axis. The coefficient of friction under block A is 0.4. Compute the coefficien

Frictionless pulley, Frictionless pulley: The frictionless pulley A ...

Frictionless pulley: The frictionless pulley A is being supported by two bars AB and AC which are hinged at points B and C to a vertical wall. The flexible cable D

Describe the terms refrigeration and air-conditioning, (a) Describe the ter...

(a) Describe the terms "Refrigeration" and "Air-conditioning". Determine the units of Refrigeration ? (b) The capacity of refrigeration is 400 TR when working between -6 o C and

Hydrostatic law, validity on compressible and incompressible fluids

validity on compressible and incompressible fluids

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