melamine & its application
TRANSCRIPT
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