How to Calculate the Absorption Coefficient and noise reduction of a Polymer
A polymer is actually a chain of small molecules and the way a polymer reacts depends exactly upon the way the small molecules are inbuilt within the polymer. It is true that polymer has got wide spread applications and it is used in bikes, car tyres and even paints. In order to calculate the absorption coefficient and noise reduction of polymer one must know the way the inbuilt tiny molecules or mono mers are combined within it.Also the extent of the density, moduli and the crystalline effect of a polymer are all responsible for the acoustic value of the polymer. Indeed it is the acoustic value which corresponds to the noise reduction capability of polymers.
These attenuators used for noise reduction
One must note that the porous polymers which contain the monomers act as acoustic dampers in order to reduce the echo effects of sounds in a music composing room. There are porous, flexural and high density sound attenuators which are used in the noise reduction. These attenuators used for noise reduction hinder the external noise and the originality of the sound is maintained by the help of fixing these polyurethane kinds of polymers for sound absorption.
For example of a simple slab of Poly urethane has got those minute pores which effectively dampen the velocity/ resonance of sound and hence the unwanted vibrations are kept under control when it is fixed in the walls of a living room or theatre.
The calculation of the absorption coefficient
The calculation of the absorption coefficient of a polymer is done by an experiment. In it the light from a source is allowed to shine through polymer which is either in the dissolved, liquefied or solidified state. The value of the intensity of the lights both after and before it passes through the polymer is divided and the resultant value must be noted.
Now take the common log book or if you have got a calculator use the log tab.Find out the log value of the divided number if the polymer was in the liquid form. Alternately find the natural log of the number of the intensity ratio if the polymer was in its gaseous form. Now simply find out the product of the number by multiplying it by -1 and this is the absorption value.
Finally multiply the value with the length of the polymer into which the light from a source was made to shine through. This gives the value of the polymer’s concentration. Now divide this absorption value by the polymer concentration value and length of the polymer. This finally gives the molar absorption co efficient of the polymer.
Thus the Absorption Coefficient of a Polymer can be easily calculated.
Author (Ninanef). Submitted on Wed, 1 Feb 2012
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