Unit 1
2 hrsPlastics: Definition and Classification of Plastics, General properties and types, Thermoplastics, Thermosetting, Engineering & High-performance plastics. Structure of Plastics: Molecules, Chains, Crystallinity and its effect on properties, Crosslinked plastics, Determination of Molecular weight, Effect of Molecular weight on processing and properties, Molecular weight distribution. Linear, Branched and cross-linked structures in polymers. Glass transition temperature (Tg).