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Контрольная работа № 2 по дисциплине «Технический иностранный язык» для студентов заочной формы обучения по направлению подготовки «Химическая техно
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- 2023 год
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Контрольная работа № 2
по дисциплине «Технический иностранный язык»
для студентов заочной формы обучения
по направлению подготовки «Химическая технология»
1. Прочитайте и переведите текст устно:
Polymerization
Polymerization is a process of reacting monomer molecules together in a chemical reaction to form three-dimensional networks of polymer chains. There are many forms of polymerization and different systems exist to categorize them. The main categories are addition polymerization (also known as “chain-growth polymerization”) and condensation polymerization (also known as “step-growth polymerization” or “step polymerization”).
Addition polymerization involves the linking together of molecules incorporating double or triple chemical bonds. These unsaturated monomers (the identical molecules which make up the polymers) have extra internal bonds which are able to break and link up with other monomers to form the repeating chain. Addition polymerization is involved in the manufacture of polymers such as polyethylene, polypropylene and polyvinyl chloride (PVC).
Condensation polymerization occurs when monomers bond together through condensation reactions. Generally, a condensation reaction is a chemical reaction in which two molecules combine to form one single molecule, together with the loss of a small molecule. Typically, condensation polymerization reactions can be achieved through reacting molecules incorporating alcohol, amine or carboxylic acid functional groups. When an amine reacts with a carboxylic acid, an amide or peptide bond is formed, with the release of water (hence condensation polymerization.) This is the process through which amino acids link up to form proteins, as well as how Kevlar is formed.
Condensation polymers are any class of polymers formed through a condensation reaction, releasing (or condensing) a small molecule by-product such as water or methanol, as opposed to addition polymers which involve the reaction of unsaturated monomers. Types of condensation polymers include polyamides, polyacetals and polyesters.
2. Ответьте на вопросы.
1. What are the kinds of polymerization? The main categories are addition polymerization (also known as “chain-growth polymerization”) and condensation polymerization (also known as “step-growth polymerization” or “step polymerization”).
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