不能根除
发表于 2025-3-30 10:19:16
Chemicals from Propylene and Butylene, used by petroleum refineries internally to alkylate gasolines. This captive use is not reported. Of the propylene used for chemical manufacture, nearly 40% is polymerized to polypropylene, to be discussed in a later chapter. Of the remaining amount of propylene, seven chemicals from the top 50 are
bizarre
发表于 2025-3-30 15:06:55
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上涨
发表于 2025-3-30 20:36:39
The Second Fifty Industrial Chemicals, on a large scale, and an understanding and appreciation of these chemicals, their manufacture and uses, provides the student with a solid background in industrial chemicals. We might ask ourselves what comes next? What are some other important large-scale chemicals that, though not made quite at th
斑驳
发表于 2025-3-30 22:50:27
Basic Polymer Chemistry: Thermoplastics,ur discussions of this subject, which will be quite detailed. The polymer industry stands out above all others as a consumer of heavy organic chemicals. The U.S. polymer industry produces over 100 billion lb of polymers and 50% of industrial chemists work with polymers. Thus we can see the importanc
INERT
发表于 2025-3-31 03:48:30
Basic Polymer Chemistry: Thermosets,: they soften or melt when heated and will dissolve in suitable solvents. They can be remelted and shaped into their finished product with no further chemical reactions. ., those having elaborately cross-linked three-dimensional structures, set or harden by undergoing a chemical reaction during the
我不重要
发表于 2025-3-31 07:18:59
Fibers,. Probably the first synthetic fiber experiment came with the work of Christian Schönbein, who made cellulose trinitrate in 1846. After breaking a flask of nitric and sulfuric acids, he wiped up the mess with a cotton apron and hung it in front of the stove to dry. Cellulose trinitrate was developed
催眠药
发表于 2025-3-31 12:35:29
Elastomers, the first to describe the rubber balls used by Indians. Natural rubber was brought back to Europe from the Amazon in 1735 by Charles Condamine, a French mathematical geographer, but it remained only a curiosity. Michael Faraday made a rubber hose from it in 1824. But it was not until Charles Goodye
Substance
发表于 2025-3-31 14:26:52
Coatings and Adhesives,esives. These are quite large areas of the chemical industry. The size of the coatings industry is best estimated by NAICS 325510, Paints and Coatings, which had 1998 U.S. shipments of $18.7 billion. The increase in this segment is graphed in Fig. 19.1 along with the three main subdivisions of the i
顽固
发表于 2025-3-31 21:02:05
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Commodious
发表于 2025-3-31 23:47:04
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