An overview of polymers

POLYMER STRUCTURES • What are the general structural and chemical characteristics of polymer molecules? • What are some of the common polymeric materials, and how do they differ chemically? • How is the crystalline state in polymers different from that in metals and ceramics ?

Naturally occurring polymers Wood – Rubber Cotton – Wool Leather – Silk Cellulose Cotton is one of the purest forms of cellulose and has been cultivated since ancient times. Rubber Natural rubber is thermoplastic, with a glass transition temperature of –70°C. cis-polyisoprene

Polymer Polyethylene (PE) Poly(vinyl chloride) (PVC) Polypropylene (PP)

How to get the product of PE, PVC and PP

How to synthesis of polyester and nylon 6

Product of PE in the Markets Helmet

MOLECULAR WEIGHT and Molecular weight distribution

Degree of polymerization and polymer chain length

Molecular Structure of Polymers

Thermoplastics and Thermosets

Example of Thermalplastic

Copolymer

Crystallinity in Polymers

Polyolefins with side chains have stereocenters on every other carbon With so many stereocenters, the stereochemistry can be complex. There are three main stereochemical classifications for polymers.

How to Determine Microstructure? 13C NMR is a very powerful way to determine the microstructure of a polymer. 13C NMR spectrum of CH3 region of atactic polypropylene

Q and A for Polymers