02-07-2013, 04:32 PM
SEMINAR ON POLYMER SCIENCE
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INTRODUCTION
Definition :
A polymer is a large molecule (macromolecule)
composed of repeating structural unit connected by covalent chemical bonds.
- The word is derived from the Greek words (poly), meaning
"many"; and (meros), meaning "part"
Example:- Butadiene, poly-vinyl-chloride etc.
- They are complex and giant molecules and are different from
low molecular weight compounds.
-`Macro-molecules’ are made up of much smaller molecules.
Classification of Polymers
1) Natural and Synthetic Polymers.
2)Organic and Inorganic Polymers.
3)Thermoplastic and Thermosetting Polymers.
4)Plastics, Elastomers, Fibers, and Liquid Resins
2) Organic and Inorganic Polymers:
A Polymer whose backbone chain is essentially made of carbon
atoms is termed an Organic polymer.
Examples- cellulose, proteins, polyethylene, nylons.
A Polymer which does not have carbon atom in their backbone chain is termed as Inorganic polymer.Examples- Glass and silicone rubber
polymerization
Polymerization is a process of bonding monomer, or “single units” together through a variety of reaction mechanisms to form longer chains named Polymer
As important as polymers are, they exist with monomers, which are small, single molecules such as hydrocarbons and amino acids
These monomers bond together to form polymers. The process by which these monomers bond is called polymerization
THERMOGRAVIMETRICAL ANALYSIS (TGA)
This method provides indication for thermal stability and upper limit of thermal degradation where loss of sample begins.
This method only measures loss of volatile content from the polymer.
This method has limitation that it can not detect temperature at chain cleavage of chain takes place.
BIO DEGRADABLE POLYMER
Biodegradable polymers can be classified in two:
Natural biodegradable polymer
examples: xanthum gum, gaur gum, chitosan, chtin etc.
Synthetic biodegradable polymer
examples: Polyanhydrides, Poly(ß-Hydroxybutyric Acidc) etc.
Synthetic biodegradable polymer are preferred more than the natural biodegradable polymer because they are free of immunogenicity & their physicochemical properties are more predictable &reproducible
[attachment=56337]
INTRODUCTION
Definition :
A polymer is a large molecule (macromolecule)
composed of repeating structural unit connected by covalent chemical bonds.
- The word is derived from the Greek words (poly), meaning
"many"; and (meros), meaning "part"
Example:- Butadiene, poly-vinyl-chloride etc.
- They are complex and giant molecules and are different from
low molecular weight compounds.
-`Macro-molecules’ are made up of much smaller molecules.
Classification of Polymers
1) Natural and Synthetic Polymers.
2)Organic and Inorganic Polymers.
3)Thermoplastic and Thermosetting Polymers.
4)Plastics, Elastomers, Fibers, and Liquid Resins
2) Organic and Inorganic Polymers:
A Polymer whose backbone chain is essentially made of carbon
atoms is termed an Organic polymer.
Examples- cellulose, proteins, polyethylene, nylons.
A Polymer which does not have carbon atom in their backbone chain is termed as Inorganic polymer.Examples- Glass and silicone rubber
polymerization
Polymerization is a process of bonding monomer, or “single units” together through a variety of reaction mechanisms to form longer chains named Polymer
As important as polymers are, they exist with monomers, which are small, single molecules such as hydrocarbons and amino acids
These monomers bond together to form polymers. The process by which these monomers bond is called polymerization
THERMOGRAVIMETRICAL ANALYSIS (TGA)
This method provides indication for thermal stability and upper limit of thermal degradation where loss of sample begins.
This method only measures loss of volatile content from the polymer.
This method has limitation that it can not detect temperature at chain cleavage of chain takes place.
BIO DEGRADABLE POLYMER
Biodegradable polymers can be classified in two:
Natural biodegradable polymer
examples: xanthum gum, gaur gum, chitosan, chtin etc.
Synthetic biodegradable polymer
examples: Polyanhydrides, Poly(ß-Hydroxybutyric Acidc) etc.
Synthetic biodegradable polymer are preferred more than the natural biodegradable polymer because they are free of immunogenicity & their physicochemical properties are more predictable &reproducible