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

Explain the lip clearance angle - angle of drills, Normal 0 fal...

Normal 0 false false false EN-IN X-NONE X-NONE MicrosoftInternetExplorer4

The tension in the cable attached to the chair, A "swing" ride at a carniva...

A "swing" ride at a carnival consists of chairs that are swung in a circle by 12.0 m cables attached to a vertical rotating pole, as the drawing shows. (θ = 60.0°) Suppose the tota

Cone of friction, Con e of Friction: When the body is having impending...

Con e of Friction: When the body is having impending motion   in direction of P , the frictional force will be limiting friction and the resultant reaction R wil

What is the use of ball race drive, (a) What is the use of ball race drive?...

(a) What is the use of ball race drive? (b) How should one install the bottom cone race? (c) What is the use of front fork oil seal driver body and its attachment? (d) Wha

What do you understand by interference, (a) Derive a mathematical expressio...

(a) Derive a mathematical expression for Maximum length of path of Contact, Maximum Length of Arc of Contact and Contact Ratio in case of Interference. (b) What do you understan

Introduction to the motorcycle , INTRODUCTION: Previously, you studied abo...

INTRODUCTION: Previously, you studied about the growth of service industry, automobile industry, two-wheeler industry and the growth of Hero Honda Motors Ltd. Now you will study d

Symmetric central force, Symmetric Central Force A central force is sph...

Symmetric Central Force A central force is spherically if the magnitude of the force does not depend on the direction (angles  θ , or  Ø ) of the particle but only on distance

Determine work done per second, A nozzle of 50 mm. dia. delivers a stream o...

A nozzle of 50 mm. dia. delivers a stream of water that strikes a flat plate which is held normal to the axis of stream. If the issuing jet has a velocity of 15 m/sec., determine:

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