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

Surface chemistry and electrochemistry of membranes, explain surfacechemist...

explain surfacechemistry and electrochemistry of membranes?

How do we adjust throttle free play?, (a) What is the function of a throttl...

(a) What is the function of a throttle valve? Where it is used? (b) How do we adjust throttle free play?

Basis of evaluation entrepreneurship development, The following form basis ...

The following form basis of evaluation : The unit has obtained all necessary clearances whether statutory or administrative, e.g. drug license under drug control order, NOC

Explain armature core and armature winding - dc generator, Armature core an...

Armature core and armature winding  Armature is the rotating part of the machine. It is cylindrical in shape with slots on its outer periphery. It houses the armature conducto

Explain the primitive instancing, Primitive Instancing In primitive ins...

Primitive Instancing In primitive instancing, the modeling system defines a set of primitive 3D solid shapes that are relevant to the application area. Primitive instances are

Aerospace engineering, An airfoil of surface area 1.5 ft2 is tested for lif...

An airfoil of surface area 1.5 ft2 is tested for lift L in a wind tunnel. At an angle of attack of 7° with standard air of density 0.0024 slugs/ft3 at a speed of 90 ft/sec, the lif

What is floating foundation, What is floating foundation? Floating Foun...

What is floating foundation? Floating Foundation: Raft or mat is also recommended when the soil mass contains compressible layers or the soil stratum is variable. In such ca

Dimension text edit command-autocad, Dimension Text Edit Command  ...

Dimension Text Edit Command   The Home option returns dimensions to their home position. The New option displays the Multiline Text

Determine the steady state amplitude of vibration, 1. (a) Sketch frequency-...

1. (a) Sketch frequency-response curves for a damped single degree of freedom system subjected to a harmonic excitation under three different damping ratios. The system has a natur

Calculate the crack stress intensity factor, Calculate the crack Stress Int...

Calculate the crack Stress Intensity Factor: If on the beam specimen of last problem two loads, each equal to 500 N, are applied at distance of 25 mm from central plane, calcu

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