Condensation Polymerisation or Step Growth Polymerisation
If the two bifunctional monomer molecules undergo condensation with loss of a simple molecule of water, alcohol etc.
Polyamides:
These polymers possessing amide linkages are important...
Types of Polymerisation Reactions
Types of Polymerisation Reactions:
There are two broad types of polymerisation reactions, i.e., the addition or chain growth polymerisation and condensation or step growth polymerisation.
Addition...
Classification of Polymers
Classification of Polymers:
There are several ways of classification of polymers based on some special considerations.
Based on Source:
Under this type of classification, there are three...
Polymer
Polymer
A polymer may be defined as a high molecular weight compound formed by the combination of a large number of one or more types...
Magnetic Properties of Solid
Magnetic Properties of Solid
Electrons are charged particles and it generates a magnetic field around itself. The magnetic field arises due to the spinning of...
Electrical Properties of Solid
Solids can be classified into three types on the basis of their conductivities.
Conductors:
The solids with conductivities ranging between 104 to 107 ohm–1m–1 are called...
Non-Stoichiometric Defects and Metal Deficiency Defect
Non-Stoichiometric Defects
A large number of non-stoichiometric inorganic solids are known which contain the constituent elements in non-stoichiometric ratio due to defects in their crystal...
Impurity Defects
Impurity Defects
If molten NaCl containing a little amount of SrCl2 is crystallized, some of the sites of Na+ ions are occupied by Sr2+ (Fig.).
Each...
Stoichiometric Defects
Stoichiometric Defects
These are the point defects that do not disturb the stoichiometry of the solid. They are also called intrinsic or thermodynamic defects.
Basically...
Imperfection in Solids
Single crystals are formed when the process of crystallization occurs at extremely slow rate. Even these crystals are not free of defects. The defects...