Already have an account? Get multiple benefits of using own account!
Login in your account..!
Remember me
Don't have an account? Create your account in less than a minutes,
Forgot password? how can I recover my password now!
Enter right registered email to receive password!
Natural Polymers
Rubber is individual natural polymer and was illustrated earlier. Specific trees exude thick liquid that solidified in brittle material termed as rosin. Shellac or lac is exudate result of animal life, parasitic insect or coccus lacca that feeds upon specific Indian trees. This material has extremely low tensile strength. While dissolved in spirit it can be utilized for polishing wooden surfaces. Wood is a naturally occurring polymer also that main constituent is cellulose. The cellulose molecule's chain is highly aligned. This alignment creates wood in mechanical properties to vary directional. The cellulose molecule is demonstrates in following figure.
Figure: Cellulose Monomer of Wood
Wood is a living matter of cells composed that resemble long thin tubes. These tubes walls are made along with cellulose fibres that are aligned beside the axis. A complex amorphous material termed lignin binds cell walls together, and lignin makes 20 to 35 percent of wood by 50 to 60 percent cellulose. Minute percentages of resins, carbohydrates, minerals and gums are representing in wood also. Whilst the density of wood material is constant for each types of wood, the occurrence of voids and cracks of various sizes and numbers origin variation of density from one category to another. The hygroscopic nature of cell walls reasons absorption of water and swelling of wood. These water molecules behave extremely like plasticiser giving flexibility to wood. Removal of water creates wood rigid.
Organic acids do not attack wood on room temperature except the inorganic acids and alkaline solutions attack wood mostly at higher temperature and concentration. On prolonged heating at 105 to 150oC the organic matter begins to wood turns black and decomposes. Wood burns readily giving heat and thus used as like fuel. This can be mechanically and chemically treated to generate wood pulp that is employed for producing paper.
The Brasses 70/30 brass also called as cartridge brass contains 70% copper and 30% Zinc. This is employed for cartridge cases, sheet fabrication, and condenser tubes and for u
can you explain about merchant circle,cutting forces
Prove that the force exerted by a jet of water on a semicircular plate in the direction of the jet when the jet strikes at the centre of the semicircular plate is two times the for
Define the difference modes of Heat Transfer with examples. State one system where Heat Transfer takes place because of all modes of Heat Transfer.
(a) Illustrate the several kinds of chips formed during metal cutting with neat diagrams. (b) Why is Titanium Nitride a valuable tool coating? (c) Give the differences betwee
Calculate the magnitude of maximum bending moment: The shear force diagram for the overhanging beam is illustrated in Figure. Draw the loading diagram & bending moment diagram
A city owns and operates a garage in which maintenance and repair work is performed on city-owned vehicles. Included among these vehicles are motor-pool cars, heavy-duty trucks, an
b. Assuming a 20 MW simple cycle gas turbine with a firing temperature of 1600K develop an analysis of a combined cycle. Assume that Tmax in the Rankine cycle is 560 C, Pmax = 60
Define a stepped bar
HOW TO PREPARE A DRAWING IN FIRST ANGLE PROJECTION AND THIRD ANGLE PROJECTION AND WHAT IS THEIR BASIC PRINCIPLE AND WE DO NOT MAKE DRAWING IN 2ND ANGLE PROJECTION AND 4TH ANGLE PRO
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!
whatsapp: +1-415-670-9521
Phone: +1-415-670-9521
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd