The hottest new points and development trends of b

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New points and development trends of biodegradable materials (Part 1)

in recent years, biodegradable materials are a hot topic of concern. There are many articles and reports, but most of them are developed for new varieties, including the manufacturing methods, applications and degradation mechanisms of synthetic selectively reinforced components. In 2004, an article entitled "nature or petrochemistry? -- biologically degradable materials" was published in the international edition of German Applied Chemistry (angew, 43, 1078 ~ 1085), which discussed the development background of such materials and some issues that should be considered from the economic and social levels with the progress of science and technology, the formation of industries and the occupation of markets. The article also predicts the development prospects of several varieties with market prospects. Although polymer materials are still the main body of this paper, there are many new ideas, which are summarized for reference. The progress and achievements of the chemical industry since the second half of the 19th century are largely due to the use of mineral raw materials as the basis for synthesis. Synthetic dyes prepared from coal have replaced natural dyes. This light stable colorant has entered the lives of the masses for the first time. At present, mineral raw materials represented by oil and gas are the most important raw materials for the chemical industry, accounting for more than 90%, ranking third only to energy and transportation. According to the statistics of OECD member countries, energy accounts for 54%, transportation accounts for 35%, and chemical industry accounts for 12% (raw materials and processing are half respectively). In the chemical industry, the oil and steam resources used as raw materials are mainly converted into polymers. In the past 50 years, general plastics has made great achievements, providing a reliable raw material base and various applicable properties. Through melting, a large number of items (such as films and molds) can be manufactured. The processing method is not only cheap, but also has little environmental pollution

after the energy crisis in 1973, the problem of alternative energy and resources, such as biomass, attracted people's attention and strengthened research. As the price of crude oil fell, public interest in it declined again. However, from the perspective of geopolitics and economic development, over reliance on oil and its limited availability make people consider alternative energy and resources. According to the current proven oil reserves, with modern mining technology, it can only be mined for 40 years. This prediction is optimistic. This is based on the continuous increase of crude oil reserves in the Middle East. Now, the greenhouse gas CO2 is completely generated by mineral raw materials, which has become difficult to predict and impossible for global climate change (2) check whether the gasket at the joint is completely reversed. Traditional plastic waste buried underground, because of its slow degradation, will occupy valuable land for a long time. Therefore, people assume that if we can make incomplete statistics on the basis of renewable resources, the current recycling application will be very attractive, especially the application of natural products

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