Dielectric material: plastics, Physics

Assignment Help:

Plastics are polymers, meaning they are made up of molecules from many different elements. By utilizing different combinations, new polymers are made that can be manipulated from many different things. Plastics are organic materials of higher molecular weight and are capable of being formed into a desired shape during or after their manufacture. However, organic materials may to be the sole constituents of plastics. The term plastic is used very frequently in common terminology even for materials which are not really plastics if viewed from the definition given above. Resin is the substitute world normally used in insulation technology in place of plastic. Plastics are synthetic resins obtained basically in two different ways, by linear polymerization and by poly condensation. The recurring chemical reaction by which molecules weight composition is called "POLYMERIZATION", and the linear polymerization is a reaction is chemical in which high molecular compound is obtained from a lower molecular compound. Without evolution of a by product in linear polymerization several monomers are linked to one another and form a single polymer molecule. These molecules are relatively easy to recycle. The polymers achieved through linear polymerization are known as "Thermoplastics". Thermoplastics can be melted and reformed any number of times. Thus they are relatively easy to recycle. When the reacting molecules combine in such a way that there is evolution of a by product of the molecular weight, like water, the process is called 'Condensation Polymerization "and this irreversible chemical reaction between different low molecular compounds. There are two general types of the linear and the spatial condensation. Thermosetting plastics are melting on heating but are converted into a rigid solid mass if maintained at an elevated temperature long enough. They become unable to maintained melt after this and hence become insoluble in any solvent.

Spatial polymers are characterized by:

  1.    Insolubility and poor insulating properties
  2.    Hardness and brittleness
  3.    Not capable of fibre formation
  4.    Good mechanical properties
  5.    High Hygroscopicity

Linear polymers are characterized by:

  1.    Good solubility and good insulating properties
  2.    Flexibility and elasticity
  3.    Capability of fibre formation
  4.    Poor mechanical properties
  5.    Low Moisture content


Related Discussions:- Dielectric material: plastics

Inertia with a spade, Inertia with a spade Scoop up a spadeful of dry e...

Inertia with a spade Scoop up a spadeful of dry earth. Now pitch the earth away from you. View that when the spade stops the earth flies on due to inertia.

Principle of electric motor, An electric motor is a device which converts e...

An electric motor is a device which converts electrical energy into mechanical energy. Principle of electric motor : An electric motor essentially consists of a rectangular co

Experiment of a small spool and a large spool, A small spool and a large sp...

A small spool and a large spool Using nails for axles fasten a large spool and a smaller spool to a block of wood. Slip a rubber band in excess of both spools. Turn the larger

What are non-mechanical waves , The waves which do not needs medium for the...

The waves which do not needs medium for their propagation are known as non- mechanical or electromagnetic waves. Examples : Light, heat (Infrared), radio waves, gamma- rays, X-r

Determine the current flowing in the conductor, A 25cm long conductor moves...

A 25cm long conductor moves at a uniform speed of 8m/s by a uniform magnetic field of flux density 1.2T.  Verify the current flowing in the conductor when (a) Its ends are o

.fluid mechanics, when do we use projected area instead of actual area and ...

when do we use projected area instead of actual area and why

Electromagetism, what is magnetic flux density of cylinder??

what is magnetic flux density of cylinder??

What is a power, Q. What is a power? Answer: That seat of EMF" rep...

Q. What is a power? Answer: That seat of EMF" reply is SO wrong. Not merely is the rate of charge delivery not power but a seat of EMF doesn't deliver charge. A seat of EM

Explain about the term extrinsic fiber optic sensors, Explain about the ter...

Explain about the term extrinsic fiber optic sensors. Extrinsic sensors: Extrinsic fiber optic sensors utilize an optical fiber cable, usually a multimode one, to transmit m

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