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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:
Linear polymers are characterized by:
It is defined as the dielectric loss expressed as the tangent of the angle between the reactance and the impedance vectors of the capacitor, it is denoted by D. FACTORS AFFECTIN
There are two most popular types of PCB as under:- (a) SINGLE SIDED PCB (b) DOUBLE SIDED PCB (c) MULTI LAYERED P
what is electronic polarization?
If W is atomic weight and N is the atomic number of an element, then: (1) Number of e -1 = W- N (2) Number of 0 n 1 = W- N (3) Number of 1 H 1 = W-N (4) Number of 0
GALLIUM PHOSPIDE: It has band gap of 2.3ev. it can be used for light emitting diodes which can emit green or red light. The red light is obtained with zinc or cadmium oxide dop
Q. Explain what do you understand by the terms potential well and potential barrier. How does a particle with energy lesser than the barrier height tunnels through its quantum mech
ACCELERATION: The time rate of change of velocity of a body is known as acceleration.
Q. If a single force acts on an object, the object accelerates. yse it is definately true. Newton's second law.
Can you explain about sharpness of resonance?
What are bare fibers? It used mostly with PMMA fibers and refers to the optics which have no external protection sheath.
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