APPENDICES 13 Casein based bioplastic from milk 1 L Milk / 4 Tablespoons vinegar The milk has to be slowly warmed in a pan or pot. The vinegar is then added while the milk is continuously stirred until solid clumps begin to form. The liquid is then poured through a strainer. The remaining clumps can be scooped out and left on a flat surface covered with kitchen paper. Kitchen paper is also used to press out excess moisture. The material will need several days to dry. Casein based bioplastic from cream and lemon juice ½ Cup heavy cream / Lemon juice The cream is mixed with three tablespoons of lemon juice in a pan or pot. The mixture is then slowly heated while continuously being stirred. Gradually more lemon juice is added while stirring further. The mixture will eventually thicken and make a gel-like consistence. After straining the mixture the solid cream byproducts can be collected and washed. They can then be molded or shaped into various forms. Starch based bioplastic 700 ml Water / 100 ml Vinegar / 50 ml Glycerin / 150 ml Cornstarch
Other recipes from the website Materiability to create his own bioplastic. You can also find more information on bioplastics on http://green-plastics.net/ or http:// materiability.com
The water, vinegar, and glycerin are poured into a pan or pot and mixed. Then cornstarch is added and the solution thoroughly stirred, while slowly adding heat, until it has completely dissolved. After continuously mixing and heating the liquid for about ten minutes it begins to thicken and turns gel-like. The heat can then be turned off but the gel should be stirred for another one to two minutes before pouring into a mold or on a flat surface. The material needs between twelve to twenty-four hours to dry, heavily depending on its thickness. Serious shrinkage might occur. The amounts and volumes can be adjusted in order to create materials with varying properties. More glycerin will result in a harder plastic, more starch makes for a denser and less viscous material. An 8 parts water, 1 part vinegar, 1 part glycerin, and 1.5 parts starch mixture might be best for filling molds and easier to work with. However starch does not make for a very sturdy plastic. It can be used to create thin, flexible films but is generally too weak to make solid objects like cups or utensils.