1, TV
The birth of television is one of the greatest inventions of the 20th century. In modern society, life without TV is unimaginable. Black-and-white and color TVs of various models and functions have continuously flowed into factories, schools, hospitals and families all over the world from one assembly line, which is miraculously changing people's lives rapidly.
2. Nylon
Carothers, an American organic chemist, made polymers from adipic acid and hexamethylene diamine in 1935. Because both components contain six carbon atoms, they were called polymer 66 at that time. He melted the polymer, extruded it with a needle and stretched it under tension, which is called fiber. This kind of fiber, polyamide 66 fiber, 1939 was named nylon after industrialization, and it was the earliest synthetic fiber variety to realize industrialization.
3. Plastic
19 in the 1960s, 1869, the earliest artificial plastic celluloid, applied for a patent because of the shortage of ivory and raw materials for making billiards. Although celluloid is the earliest artificial plastic, it is an artificial plastic, not a synthetic plastic. The first synthetic plastic was made of phenolic resin in a heated mold, which was made by Belgian chemist Backlander in the early 20th century.
The significance of the invention of plastics
Plastic products are too common around us. When you go shopping in the supermarket, you need plastic bags. The packaging bags of snacks are also plastic. Food crisper is also a plastic product. Your smart phone, household appliances, cars and even silicone for breast augmentation all contain plastic.
Take plastic for example, it has saved the lives of countless elephants, so many environmentalists' hatred of plastic products is actually unreasonable. It is not plastic that pollutes the environment, but human beings.
Plastics have also left valuable audio-visual materials for our human history. In the past, it was difficult for us humans to leave any pictures except painting. Those who could afford painters were rich, and the poor naturally could not leave anything.