Электронные лекции для специальности 08.02.01 Строительство и эксплуатация зданий и сооружений 3 курс

Практическая 19. Полистирол как современный строительный материал. (2 часа)

План

1. Работа с текстом по теме «Полистирол как современный строительный материал».

1. Работа с текстом по теме «Полистирол как современный строительный материал».

1. Read and translate the text

Polystyrene

           Polystyrene is a thermoplastic produced by the polymerization of styrene. The electrical insulat­ing properties of polystyrene are outstandingly good and it is relatively unaffected by water. Typical applications include light fixtures, toys, bottles, lenses, capacitor dielectrics, medical syringes, and light-duty industrial components. Extruded sheets of polystyrene are widely used for packaging, envelope windows, and photographic film. Its resistance to impact can be improved by the addition of rubber modifiers. Polystyrene can be readily foamed; the resulting foamed polystyrene is used exten­sively for packaging.

        Polythene (polyethene, polyethylene) is a plastic made from ethane. It is one of the most widely used important thermoplastic polymers. It was first developed by the polymerization of ethane at a pres­sure of 2,000 bar at 200°C. This produced low-density poly­thene (LDPE). A relatively high-density form (HDPE) was synthesized in the 1950s using a complex catalyst. Poly­thene is a white waxy solid with very low density, rea­sonable strength and toughness, but low stiffness. It is easily moulded and has a wide range of uses in contain­ers, packaging, pipes, coatings, and insulation.

2. Выберите наиболее подходящий ответ на каждый вопрос.

Вопрос 1:

___________ (PS) macroporous resin has also been used to immobilize the lipase from Burkholderia cepacia, and this resin has been successfully demonstrated to enhance lipase activity together with bioimprinting and interfacial activation.

polystyrenes

polystyrene

Вопрос 2:

unexpanded ___________

polystyrenes

polystyrene

Задания

1. Составить 5 вопросов по тесту.

2. Выпишите незнакомые слова с текста.

1.Батманов В.В. Engineering : сборник текстов и упражнений по английскому языку для студентов, обучающихся по направлению «Строительство»/В.В. Батманов, Е.К. Платонова. – Волгоград: ВолгГАСУ, 2017. – 458Кбайт.

2. https://www.chemicalsafetyfacts.org/polystyrene/