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

Working of steam engine , Working of stream engine: The high pressure ...

Working of stream engine: The high pressure steam from boiler is supplied to the steam chest. The high pressure steam enters cylinder through inlet port and exerts pressure on

Explain power transmission systems, The basic power transmission systems ar...

The basic power transmission systems are 1. Belt drive 2. Chain drive and 3. Gear drives. Belt drive is commonly used for transmission of power when exact velocity rat

Evaluate the principal stresses and principal planes, At a fixed point in a...

At a fixed point in a strained material the intensities of normal stress on the planes at right angles to each other are 20 N/mm 2 and 10 N/mm 2 . Evaluate the principal stresses

What do you know about direct welds, Q. What do you know about Direct welds...

Q. What do you know about Direct welds? It is a welding method in which one or more electrodes oppose each other, contacting both sides of the work and with the current passing

Sleepers - permanent way, Sleepers: The sleeper is the part of the tr...

Sleepers: The sleeper is the part of the track on which the rails rest. Its functions are : (a) To hold the rails to the correct gauge. (b) To transmit and distribute t

State Initial graphics exchange specifications, Initial Graphics Exchange S...

Initial Graphics Exchange Specifications (IGES) The basic concept of IGES is concerned with the exchange of product description data from one CAD system to another one. The CAD

Describe that energy is a point function, (a) Describe that Energy is a poi...

(a) Describe that Energy is a point function and a property of the system. (b) What is the essence of 1 st law of thermodynamics ? Write down expression for the first law appli

What is upr, What is UPR Novel architecture for complete CAD data excha...

What is UPR Novel architecture for complete CAD data exchange, called the Universal Product Representation (UPR).

Calculate flange stresses, Q. Calculate flange stresses? Step 1: Calc...

Q. Calculate flange stresses? Step 1: Calculate flange stresses for system design conditions using existing gasket dimensions. The minimum width of the gasket should equal or

Boilers, BOILERS: BOILERS : Boilers can be defined as closed pressu...

BOILERS: BOILERS : Boilers can be defined as closed pressure vessels that are used to generate steam at pressure much higher than atmospheric pressure by the transfer of he

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