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

Find out the intensity of the external pressure, Find out the intensity of ...

Find out the intensity of the external pressure: A thick cylinder of 0.5 m external diameter & 0.4 m internal diameter is subjected simultaneously to internal & external press

Find out its centre of gravity, Find out its centre of gravity: A squa...

Find out its centre of gravity: A square plate of uniform thickness and density is bent along M 1 M 2 till corner C coincides along with centre C′. Find out its centre of gr

EM2013KEN2401MECH, Hi. I have made a payment for the above ticket number. W...

Hi. I have made a payment for the above ticket number. Will I get all the workings out too? [email protected]

Temperature measurement by using thermometers, T emperatur e Measurement ...

T emperatur e Measurement by Using Thermometers: To measure temperature at temperature scale should be devised assigning arbitrary numbers to a known specific level of hotne

Kinematic and dynamics, In Figure P4.2 , ?1 = 200 rad/s cw and a1 = 4000 ra...

In Figure P4.2 , ?1 = 200 rad/s cw and a1 = 4000 rad/s2 cw, Find the acceleration of points B, C, and D and the angular acceleration of link 2?

Define the polyhedra and euler formula, Polyhedra and Euler's Formula T...

Polyhedra and Euler's Formula The b-rep of a polyhedra that are holomorphic to a sphere are topologically valid if they satisfy the following equations : F - E + V - L = 2 (

Rcc pipe culverts, RCC Pipe Culverts: Reinforced cement concrete pipe...

RCC Pipe Culverts: Reinforced cement concrete pipe culverts are ideal for dealing with small discharges. The advantages are : (a) They are very economical, since a circula

Second gear position- shifting of gear, Second Gear Position: When ge...

Second Gear Position: When gear M2 on the main shaft is in mesh with gear C2 on the countershaft then this is known as second gear position. To rotate free gear M2 with the m

Babbitts- bearing materials, Bearing Materials Generally it can be sai...

Bearing Materials Generally it can be said as a good bearing material must posse following characteristics as: It must be strong enough to sustain bearing load. It

Stress analysis, what is the importance of stress analysis in steels

what is the importance of stress analysis in steels

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