Coagulation of latex

•Download as PPTX, PDF•

1 like•20,519 views

Milky fluid from tapped rubber trees called Latex Conversion of latex to solid (Coagulation ) Latex - Colloidal solution containing an aqueous suspension of rubber particles Coagulation of rubber can be speeded by the addition of acid. The bacteria present in the latex produces organic acids The hydrogen ions from the acids produced neutralises the negative charge on the rubber particles. The bacteria present in the latex produces organic acids The hydrogen ions from the acids produced neutralises the negative charge on the rubber particles. The hydroxide from ions from aqueous ammonia neutralise the acids produced by bacteria. The negative charges at the membranes of rubber particles are maintained Latex is coagulated by adding a weak acid : methanoic acid and ethanoic acid When an acid is added to latex, the hydrogen ions from the acid will neutralize the negative charges on the surfaces of the colloidal particles. The particles become neutral and come closer and collide with one another.

$COAGULATION OF LATEX$

$COAGULATION OF LATEX  Milky fluid from tapped rubber trees called Latex Conversion of latex to solid (Coagulation )  Latex - Colloidal solution containing an aqueous suspension of rubber particles  Coagulation of rubber can be speeded by the addition of acid.$

$THE COAGULATION OF LATEX CAN OCCUR WITHOUT THE ADDITION OF ACID IF THE LATEX IS EXPOSED TO AIR FOR A FEW DAYS .THIS IS BECAUSE : a) The bacteria present in the latex produces organic acids b) The hydrogen ions from the acids produced neutralises the negative charge on the rubber particles.$

$COAGULATION OF LATEX CAN BE PREVENTED BY THE ADDITION OF AQUEOUS AMMONIA BECAUSE a) The hydroxide from ions from aqueous ammonia neutralise the acids produced by bacteria. b) The negative charges at the membranes of rubber particles are maintained$

$Coagulation of latex Add a weak acid • • • Latex is coagulated by adding a weak acid : methanoic acid and ethanoic acid When an acid is added to latex, the hydrogen ions from the acid will neutralize the negative charges on the surfaces of the colloidal particles. The particles become neutral and come closer and collide with one another. • The collisions between the latex particles break open the protein membrane and releases the rubber polymers • • The rubber polymers can coalesce (combine) and form lumps of rubber ( coagulation of latex) The lumps of rubber are white solids and are quite elastic$

Coagulation of latex

1. COAGULATION OF LATEX

2. COAGULATION OF LATEX  Milky fluid from tapped rubber trees called Latex Conversion of latex to solid (Coagulation )  Latex - Colloidal solution containing an aqueous suspension of rubber particles  Coagulation of rubber can be speeded by the addition of acid.

3. THE COAGULATION OF LATEX CAN OCCUR WITHOUT THE ADDITION OF ACID IF THE LATEX IS EXPOSED TO AIR FOR A FEW DAYS .THIS IS BECAUSE : a) The bacteria present in the latex produces organic acids b) The hydrogen ions from the acids produced neutralises the negative charge on the rubber particles.

4. COAGULATION OF LATEX CAN BE PREVENTED BY THE ADDITION OF AQUEOUS AMMONIA BECAUSE a) The hydroxide from ions from aqueous ammonia neutralise the acids produced by bacteria. b) The negative charges at the membranes of rubber particles are maintained

5. Coagulation of latex Add a weak acid • • • Latex is coagulated by adding a weak acid : methanoic acid and ethanoic acid When an acid is added to latex, the hydrogen ions from the acid will neutralize the negative charges on the surfaces of the colloidal particles. The particles become neutral and come closer and collide with one another. • The collisions between the latex particles break open the protein membrane and releases the rubber polymers • • The rubber polymers can coalesce (combine) and form lumps of rubber ( coagulation of latex) The lumps of rubber are white solids and are quite elastic

�ݺ�ߣ

Coagulation of latex

More Related Content

Coagulation of latex