Materials synthesis means making a usable material, such as a glue, a waterproof coating or a plastic substitute, from raw organic feedstocks. The carrier names three families: adhesives (hide glue, casein, plant resins), waterproofing (waxes, tars, resin coatings) and plastic alternatives (casein plastic, shellac, cellulose). Start with the natural polymer that is already a glue or a plastic, because every added chemical step adds hazard and loses yield.
Part of Organic Chemistry
Building useful materials from fats, proteins, resins and fibres using the extraction and reaction techniques of organic chemistry.
Three Families, One Principle
The carrier groups the subtopics under “Creating useful materials from scratch”: adhesives and glues, waterproofing, and plastic alternatives. Each is a polymer problem (see Polymerization): proteins, resins, waxes and cellulose are already long molecules, and the task is to dissolve, melt or cure them into a useful form.
| Need | First choice | Articles |
|---|---|---|
| Join wood, leather, paper | Hide or bone glue; casein glue | Adhesives and Glues |
| Keep water out | Wax, pitch, tar, oils | Waterproofing and Waterproofing Methods |
| Mould or coat a solid | Casein plastic, shellac | Plastic Alternatives |
What You Need
- A clean workshop with two separated areas, one for hot work and one for solvents.
- Feedstock sources: hides and bone from butchering, milk, tree resin, fats (Animal Fats), tar (Wood Tar Production).
- A water bath, so that nothing is heated directly over a flame.
- Scales and a notebook: every recipe in this family is a ratio.
Method: Choosing And Making A Material
Step 1: Write down the requirement: bond strength, water resistance, working time, heat tolerance.
Step 2: Pick the corpus recipe that meets it, from the table.
Step 3: Make a small test batch and test it on scrap before committing the real work.
Step 4: Record ratios, temperatures and results, so the batch can be repeated.
Worked Example: Dissolving Shellac For A Test Batch
The shellac page (Shellac) gives about 200 g of seedlac per litre of alcohol. To make a 250 mL test batch:
- Scale the litre down: 250 ÷ 1,000 = 0.25.
- Seedlac: 200 × 0.25 = 50 g.
- Alcohol: 250 mL.
The same ratio scales up or down. Alcohol is flammable, so dissolve in a closed jar standing in warm water, never over a flame.
Common Mistakes
- Going straight to a synthetic route when a natural glue would do.
- Skipping a small test batch.
- Using the wrong glue for the job. A glue that dissolves in water is wrong for a boat.
- Cooking resin directly over a flame.
Safety
Solvent vapour, hot resin and caustic reagents
Alcohol and turpentine-type solvents burn; hot pitch and glue scald and stick to skin; lime and lye used with casein are caustic. Work outdoors or in a ventilated shed, keep ignition sources away, and see Storage Containers for solvent storage. Do not attempt to make explosive-grade nitrocellulose; the plastics articles cover that history as chemistry without a procedure.
What’s Next
- Learn next: Adhesives and Glues — the first and most useful family
- Combine with: Polymerization — why these materials work