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

Describe span of bridge and varying depth, The press tressed bridge structu...

The press tressed bridge structure would look like as shown below,   The following factors influences the decision to select the particular prestressing, 1/Span of br

Total resistance of the system between the electrodes, The total resistance...

The total resistance of the system between the electrodes consists of (i) The resistance of the work piece R 1 (ii) The contact resistance between the electrodes and the wo

Torsional equation , Torsional equation: Derive the Torsional equatio...

Torsional equation: Derive the Torsional equation T / J = Π  /R = Gθ / L Or Derive an expression for the shear stress in shaft subjected to a torque. Sol.

Low resistance or very high current in primary coil circuit, If Low Resista...

If Low Resistance or Very High Current in Primary Coil Circuit Causes of Problem Remedy Primary ignition coil short circuited

Friction welding, FRICTION WELDING In this, friction is employed to genera...

FRICTION WELDING In this, friction is employed to generate heat b/w two sliding or rotating metal surfaces. This process is usually carried out by placing the pieces to be welded

Air injection system and solid injection system, (a) Explain a typical fuel...

(a) Explain a typical fuel feed system for a C.I engine, differentiate between air injection system and solid injection system. (b) Why Gasoline injection system has been adopte

I want answer, #question. Select a standard rolled steel I-section for the ...

#question. Select a standard rolled steel I-section for the simply supported beam shown in figure below. Select an appropriate factor of safety and material strength. Include ref

Air-conditioning guidelines, The following guidelines are intended to assis...

The following guidelines are intended to assist the HVAC lead, designer or auditor in preparing an assessment of the quality of the HVAC engineering work for a specific project. T

Structural notches-metallurgical defects, Structural notches In t he ca...

Structural notches In t he case of solid solution strengthened alloys and age hardenabled steel, the variation in heat i/o during welding may cause localized grain coarsening o

Frictional force acting on the ladder, Frictional force acting on the ladde...

Frictional force acting on the ladder: A uniform ladder having length 13m and weighing 250N is placed against smooth vertical wall with its lower end 5m from wall. The coeffi

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