Supervised by:

Presented By:

Samina Hasan2013-ag-6272Msc Chemistry 4th

Dr. Nazish Jahan

University of Agriculture Faisalabad, Pakistan

melamine

polymer

Contents Definition Types of polymer/polymerizationThermal ResponseIntroduction of melamineSynthesisCharacteristicsUses of melamineMisuses of melamine

POLYMERIZATION:

POLYMER:

The repeated unit of monomer is called polymer.

The process through which polymers are formed.

Types of polymersOrigin :

• Natural polymer

• Synthetic polymer• Semi-synthetic polymer

Composition:• Homo-polymer• Co-polymer

Thermal Response

Thermoplastic:can be molded on heating e.g.

PVC

Thermo sets:can not be molded on heating

again and again e.g. diene rubber

Types of Polymerization

1.Addition polymerization

OR Chain growth Reaction2. Condensation

Polymerization OR

Step growth reaction

Growth chain reaction:

Condensation polymer:Condensation polymerization, a form of step-growth polymerization, is a process by which two molecules join together, resulting in loss of small molecules which are often water

Introduction of Melamine

History• In 1834, synthesized by German scientist Justus Von Leibig.

• In 1930,the prices were cheap, American began using its powder to make things e.g beetleware and kitchen items.

Origin/Composition

• Melamine is synthetic polymer

• It is Homo-polymerStructure

•Hetro-cyclic organic compound• Rich in Nitrogen, a property similar to protein

Synthesis of Melamine

•most industrial manufacturers use urea  to produce melamine:

Steps of Reaction

1ststep2nd step 6 HCNO + 3 NH3 → C3H6N6 + 3 CO2 + 3NH3

6 (NH2)2CO → C3H6N6 + 6 NH3 + 3 CO2

(NH2)2CO → HCNO + NH3

Melamine Formaldehyde(Resin)

USES of MELAMINE RESIN:• Used to form dinner-ware• Good quality material

• Crockry material• Not cracked easily

• It used to form white board.

• Used in paper manufacturing industry

• Enhance strength and whiting

• It used in industries as fixer

• Used as auxiliaries in textile industries

• Used as cross linkers in tires & rubber industry

• It used as flooring agent

• Melamine used as parts of paints & varnishes• also used as fertilizer • It used as

flame retardant material• used as sound absorbing material

 Gibson, Weldon B (1980). SRI: The Founding Years. Stanford Research Institute. ISBN 0-913232-80-7.

Jump up^ Anne Field (2003-06-2 . "Melamine Plastic". Home Maintenance and Repair. Michigan State University Extension.

Jump up^ "The Rise and Fall of Melamine Tableware". plastiquarian (Plastics Historical Society) (32): 10. Summer 2004. Archived from the original on 2008-06-25. Retrieved 2008-12-12.

Jump up^ "Melamine". Pro Woodworking Tips.com.

References