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

Characteristics of adhesives and adhesive joints, Characteristics of Adhesi...

Characteristics of Adhesives and Adhesive Joints While an adhesive joint is created this has to show individual or several of given properties. (a) Mechanical strength again

Position of centre of gravity of the frustrum of a cone, Position of centre...

Position of centre of gravity of the frustrum of a cone: situate the position of C. G. of the frustrum of a cone with height H = 12 cm and with  diameter 8 cm and 12 cm at top

Performance criterion of a steam power plant, Performance criterion of a st...

Performance criterion of a steam power plant: Sol. :   The design of power plant can be determined largely by the consideration of capital cost and operating cost; the forme

Takt time for sand blasting, Takt Time for sand blasting:            ...

Takt Time for sand blasting:             Tatk time is crucial in manufacturing process. It determines the speed of production to produce a product. Time is money toward prod

What is called materials which can store electrical energy, Materials which...

Materials which can store electrical energy are called (A) magnetic materials.  (B) semi conductors. (C) dielectric materials.  (D) super conductors. Ans: Mater

Feeler gauge-measuring tools , Feeler Gauge: It is used to measure minor c...

Feeler Gauge: It is used to measure minor clearances. Feeler gauges come in set of a few blades of different thickness as shown in Figure. It is used to measure the spark plug gap

Painting of structural components of skid, Q. Painting of structural compon...

Q. Painting of structural components of skid? Sandblasting and priming shall be carried out prior to assembly, and shall include all bolt holes, flange faces, etc. Flange gaske

Static friction, Static Friction: When applied force is less than limiting...

Static Friction: When applied force is less than limiting friction, body remains at rest and this type of frictional force is called as static friction and this law is called as l

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