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

Resistance welding electrodes and holders, Resistance welding electrodes an...

Resistance welding electrodes and holders Requisites For Electrodes : The resistance welding electrodes are meant for the following functions: Conducting electricity

Dryness fraction measurement - thermodynamics, Dryness fraction measurement...

Dryness fraction measurement: Sensible Hea t of Water or Heat of Liquid or Enthalpy of Liquid (h) Sol.: It is quantity of heat which is required to raise unit mass

Structural design, The Contractor is responsible for obtaining all drawings...

The Contractor is responsible for obtaining all drawings, standards and specifications referred to in the bid documents and to request as needed additional or missing reference dat

Element stiffness matrices, Use three frame elements to analyse the frame s...

Use three frame elements to analyse the frame structure as depicted in the image below subjected to combined loadings: a) a concentred load applied  on Element 1  at  its  1/3 leng

Design a remote control transmitter, You are required, as part of a small t...

You are required, as part of a small team, to design a remote controlled buggy that can be made to move forwards, backwards and from side to side. The basic buggy and motors are pr

Calculate the cutting speed in drilling operation, Calculate the Cutting Sp...

Calculate the Cutting Speed in Drilling Operation Calculate the cutting speed if a drill of 0.04 m dia is operated at a speed of 250 rpm. Solution D = 0.04 m N = 25

Eccentricity-unbalance-balancing, Eccentricity : This is distance between...

Eccentricity : This is distance between the axis of rotation and CG of mass. Unbalance : This is the product of mass and eccentricity. Balancing : This is

Sizing a solar pv system, The Rusk's own fairly large house near San Franci...

The Rusk's own fairly large house near San Francisco and the following spreadsheet shows their month to month power use for two years.  1. What is their monthly average power us

Employability skills, Employability skills required for effective employmen...

Employability skills required for effective employment

Mechanics materials , 1) Factor of Safety is calculated by using which of t...

1) Factor of Safety is calculated by using which of the following set of values? [Select the one best answer from the choices given below.] Answer a. Yield Stress and Allowable St

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