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Developing a glue

Description

Glue can be made from the protein in milk called casein. In this experiment you will prepare polymer glue from milk. The casein is separated from milk by processes called coagulation and precipitation.

Credits

:
This is an experiment from the Practical Chemistry project, developed by the Nuffield Foundation and the Royal Society of Chemistry.
developing-a-glue



Apparatus Chemicals

Eye protection

Each working group requires:

Spatulas

Stirring rods

Measuring cylinders (100 cm3 and 25 cm3)

Beakers (100 cm3 and 250 cm3

Bunsen burner

Heat resistant mat

Tripod

Gauze

Filter funnel and paper

Lolly sticks (Note 1)

Indicator paper

Weights (the ones on a hook are ideal) to be added about 100 g at a time

Sand tray or box of scrunched up newspaper

Each working group requires:

Milk (semi-skimmed, full fat, and skimmed), at least 100 cm3

Vinegar

Bases – eg sodium hydrogen carbonate, magnesium carbonate, calcium carbonate, milk of magnesia

Refer to Health & Safety and Technical notes section below for additional information.

 










Glue can be made from the protein in milk called casein. In this experiment you will prepare polymer glue from milk. The casein is separated from milk by processes called coagulation and precipitation.

ADDITIONAL INFORMATION

This is a resource from the Practical Chemistry project, developed by the Nuffield Foundation and the Royal Society of Chemistry. This collection of over 200 practical activities demonstrates a wide range of chemical concepts and processes. Each activity contains comprehensive information for teachers and technicians, including full technical notes and step-by-step procedures. Practical Chemistry activities accompany Practical Physics and Practical Biology.