by admin | May 24, 2015 | sem1
Anionic and Cationic Polymerization Ionic polymerization is faster than the free radical polymerization.Ionic polymerization is initiated by a positive ion or a negative ion.Depending upon the nature of ions the polymerization takes place in two ways as Anionic and...
by admin | May 24, 2015 | sem1
Polymerization is a process of reacting monomer molecules together in a chemical reaction to form polymer chains or three-dimensional networks.There are many forms of polymerization and different systems exist to categorize them. Mechanism of Addition Polymerization...
by admin | May 24, 2015 | sem1
Degree of Polymerization The number of repeating units (n) in a polymer chain is known as the degree of polymerization. It is represented by the following relationship. Degree of polymerization (n) = Molecular weight of the polymeric network / Molecular weight of the...
by admin | May 23, 2015 | sem1
Projection of Cone Sample Problem1: Draw the projection of cone , base 30 mm diameter and axis 50 mm long , resting on HP on a point of its base circle with the axis making an angle of 45º with HP and parallel to VP. Steps for Projection of Cone : Simple Position: 1....
by admin | May 23, 2015 | sem1
Thermoplastic and Thermosetting Thermoplastic: A thermoplastic, or thermosoftening plastic, is a plastic material, polymer, that becomes pliable or moldable above a specific temperature and solidifies upon cooling. Most thermoplastics have a high molecular weight. The...
by admin | May 23, 2015 | sem1
Natural and Synthetic Polymers There are two types of polymers: synthetic and natural. Synthetic polymers are derived from petroleum oil, and made by scientists and engineers. Examples of synthetic polymers include nylon, polyethylene, polyester, Teflon, and epoxy....
