iv.
Write reactions involved in the
formation of --- 1) Teflon
2) Bakelite
Answers
Answer:
Teflon :
addition polymerization
monomer : tetrafluoroethene Preparation : heating in presence of a persulphate catalyst [ oxidising agent ] at high pressure
n CF2 = CF2 ............ --[--CF2 - CF2 --]-n-
Terylene :
Condensation polymerisation
Monomer → Benzene 1,4 –dicarboxylic acid and Ethane 1,2-diol [ terephthalic acid and ethylene glycol ] Pressure : 450 K Catalyst : Zinc acetate and Antimony trioxide
Melamine-formaldehyde Polymer Monomer →Melamine and Formaldehyde.
Step : (1) Melamine [ 2,4,6 – triamino-1,3,5-triazine ] reacts with HCHO to form an Intermediate resin. Step : (2) This intermediate resin now undergoes Condensation polymerization to form the Melamine-formaldehyde Polymer
Explanation:
Answer:
(1)The monomer used for getting polyvinyl chloride is CH2 =CHCl (vinyl chloride).
(2)The monomer used for getting teflon is
CF2=CF2 (tetrafluoroethylene).
hope helpful....