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

What are multistranded fibers, What are multistranded fibers? Multistra...

What are multistranded fibers? Multistranded optics is narrow walled tubes of transparent material that housing a number of smaller solid core fibers. These inner fibers are, u

Wave, application of huygen''principle

application of huygen''principle

Defect of vision, defect of vision project work 8&10 pages

defect of vision project work 8&10 pages

Can you give the condition for dispersion without deviation, Can you give t...

Can you give the condition for dispersion without deviation and illustrate colour has got the maximum angle of deviation?

Explain construction of michelsons interferometer, Q. Explain Construction ...

Q. Explain Construction of michelsons interferometer? It consists of two highly polished plane mirror M1 and M2, with two optically plane glass plate G 1 and G 2 which are of

Rotational equilibrium, A light horizontal bar has a length of 3m. If a 102...

A light horizontal bar has a length of 3m. If a 102-kg mass is placed 80 cm away from the left end of the bar and a 109-kg mass is placed 2.15 m from the left end, where must it be

Electrostatic, why can one ignore quantization of charge when dealing with ...

why can one ignore quantization of charge when dealing with macroscopic charges

Rutherford''s atomic model, RUTHERFORD'S ATOMIC MODEL:- Rutherford prop...

RUTHERFORD'S ATOMIC MODEL:- Rutherford proposed that all the positive charge and mass of the atom was concentrated in a small central region which is called the nucleus.This mo

State kirchoffs second law in electricity., Q. State Kirchoff's second law ...

Q. State Kirchoff's second law in electricity? Kirchoff's second law (voltage law) the algebraic total of the products of resistance as well as current in each part of any

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