1. Vulcanization of rubber
Goodyear, a poor American inventor, was determined to transform raw rubber into an ideal material that was both elastic and tough. He was fascinated by rubber for more than 30 years, but spent his life in poverty. The story in Goodyear’s hometown: do you want to find Goodyear? Look, there it is! He wore a rubber cap, a rubber lined windbreaker, a rubber vest underneath and rubber pants underneath. Rubber boots and a rubber purse-not a cent in it. Goodyear gels were mixed with magnesium oxide, boiled in lime water, boiled in nitric acid, sprinkled with sulfur on the surface of gels, dried in the sun, and so on. After all his experiments had failed, he put bits of raw glue, powdered sulfur, and turpentine into a crucible and cooked it on the stove. Accidentally, a piece of glue popped out of the cauldron and fell into the flames, burning but not sticky. Goodyear jumped for joy. The rubber, heated with sulfur, was what he had been waiting for all day.
In today’s rubber factories, this is called the vulcanization process. Since then, raw rubber has been transformed into a useful material. Goodyear’s vulcanization process was later figured out by chemists: sulfur atoms built “Bridges” between large molecular chains of raw rubber, as if the springs of a sofa were connected to each other with twine and wire, elastic but not loose.
2. How dose the black and white of rubber change?
Rubber mixed with carbon black can be hardened and wear resistant. Sole, the black color of rubber tire is caused by carbon black. White rubber without carbon black, add white calcium carbonate, qin white powder filler. Eraser pencil words can only be made of white rubber, can not erase the pencil words but left a black mark. So the black and white of rubber is not a random choice of colors. With the progress of society, nowadays, adding fillers in rubber can make products appear different colors, which can meet the personalized needs of modern people for rubber products.