Science and technology in the 2th century also created television, nylon and plastics, which greatly changed people's lives.
1. Television
The birth of television is one of the greatest inventions of the 2th century. In modern society, life without TV is unimaginable. Black-and-white and color TVs with various models and functions have been continuously flowing into factories, schools, hospitals and families all over the world from one assembly line, which is miraculously changing people's lives rapidly.
2. Nylon
In 1935, carothers, an American organic chemist, made a polymer from adipic acid and hexamethylene diamine. Because both components contained six carbon atoms, it was called polymer 66 at that time. He melted the polymer and extruded it with an injection needle, and stretched it under tension, which was called fiber. This kind of fiber, polyamide 66 fiber, was named nylon after industrialization in 1939, and it was the earliest industrialized synthetic fiber variety.
3. Plastics
In the 196s, the earliest artificial plastic celluloid was patented in 1869 because of the shortage of ivory and the lack of raw materials for making billiards in the United States. Although celluloid is the earliest artificial plastic, it is an artificial plastic, not a synthetic plastic. The first synthetic plastic was made by pressing phenolic resin in a heating mold, which was made by Belgian chemist Backlander in the early 2th century in 191.
The significance of the invention of plastics
Plastic products are very common around us. You need plastic bags when you go to the supermarket to buy things. The packaging bags of small foods are also plastic. The crisper for food is also plastic products. The smart phones, household appliances, cars and even silicone for breast augmentation you use all contain plastic materials.
Taking plastic as an example, it has saved the lives of countless elephants, so many environmentalists' hatred of plastic products is actually unreasonable. It is not the plastic that pollutes the environment, but human beings that pollute the environment.
Plastic has also left valuable audio-visual materials for our human history. In the past, it was difficult for us to leave any pictures except painting, and those who could afford painters were rich, so the poor naturally could not leave anything behind.