Styrofoam

The annual production of styrene in the United States is approximately 1 2 X 10 lb with about 65% of this output used to prepare polystyrene plastics and films Styrofoam coffee cups are made from polystyrene Polystyrene can also be produced m a form that IS very strong and impact resistant and is used widely m luggage television and radio cabinets and furniture... 

Property Styrofoam/ extmded Bead, board-molded Foam sheet ASTM... 

Extruded Rigid Foa.m. In addition to low temperature thermal insulation, foamed PSs are used for insulation against ambient temperatures in the form of perimeter insulation and insulation under floors and in walls and roofs. The upside-down roof system has been patented (256), in which foamed plastic such as Styrofoam (Dow) plastic foam is appHed above the tar-paper vapor seal, thereby protecting the tar paper from extreme thermal stresses that cause cracking. The foam is covered with gravel or some other wear-resistant topping (see Roofing materials). 

A 2.54-cm Styrofoam plastic foam with thermal conductivity of ca 0.03 W/ (m-K) (0.21 (Btu-in.)/(ft-b°F)) is equivalent to 61 cm of gravel. Any synthetic foam having compressive strength sufficiently high and thermal conductivity sufficiently low is effective. However, the resistance of PS-type foams to water, frost damage, and microorganisms in the sod makes them especially desirable. An interesting and important appHcation of this concept was the use of Styrofoam in the constmction of the Alaska pipeline. In this case, the foam was used to protect the permafrost. 

The checkers used a home-made, glass-jacketed funnel sealed with a rubber septum. The submitters cut one side and part of the bottom of a styrofoam cup and with tape held this in place around the lower part of the addition funnel. 

STYROFOAM , polystyrene insulation, 122 STYRON A-TECH , polystyrene resins, 122 Subtilisins, 122 Sucrose, 122... 

When the styrene molecule polymerizes, the result is polystyrene—Styrofoam. 

Colloids are classified according to the phases of their components (Table 8.9). A colloid that is a suspension of solids in a liquid is called a sol, and a suspension of one liquid in another is called an emulsion. For example, muddy water is a sol in which tiny flakes of clay are dispersed in water mayonnaise is an emulsion in which small droplets of water are suspended in vegetable oil. Foam is a suspension of a gas in a liquid or solid. Foam rubber, Styrofoam, soapsuds, and aerogels (insu-... 

A foam is a colloid formed by suspending a gas in a liquid or a solid matrix, while a sol is a suspension of a solid in a liquid. Some examples of foams are styrofoam and soapsuds examples of sols are muddy water and mayonnaise. 

Constant-pressure calorimetry requires only a thermally insulated container and a thermometer. A simple, inexpensive constant-pressure calorimeter can be made using two nested Styrofoam cups. Figure 6-16 shows an example. The inner cup holds the water bath, a magnetic stir bar, and the reactants. The thermometer is inserted through the cover. The outer cup provides extra thermal insulation. 

Styrofoam cup containing 205 mL of hot coffee at 83.2 °C. Find the final temperature of the coffee, if the initial temperature of the spoon is 22.0 °C and assuming that coffee has the same heat capacity as water. Would an aluminum spoon of the same mass cool the coffee more or less effectively ... 

Polyvinylchloride (PVC) Piping, floor tile, clothing 5.6 Polystyrene (Styrofoam)Containers, heat insulators2.9 Styrene-butadiene Tires, fibers 2.0... 

C13-0053. Draw a section of the polymer chain showing at least four repeat units for each of the following polymers (a) Teflon (b) PVC and (c) Styrofoam. 

Identify the monomers used to make the following pol Tners (a) Kevlar (b) PET and (c) Styrofoam. 

Soybean dry matter production. One week after planting in the pipes, two-hundred-forty 0.7 liter styrofoam cups with four holes in the lower sides of each were filled with a 2 cm layer of pea gravel, then filled to within 1 cm of the top with a 1/1/1 v/v/v mix of perlite, coarse sand and a sandy loam soil. Each cup was planted with three soybean seed ( Centennial or Coker 136 ) previously coated with Nitragin. The seed were covered with 1 cm of soil mix and watered with tap water. 

Soybean nodulatlon. Styrofoam cups (180 ml) with four holes in the lower sides were filled with coarse vermlculite mixed with FTE 555 (2 g/1) and Nitragin (2.5 g/1). A ger-... 

By filling the casing with a material that replace the water it will not be possible for the freezing pressure to occur. It would be possible to use a material like Styrofoam, Figure 60. Even if not all water is replaced the freezing pressure will be substantially reduced. 

Vermiculite seems to be the best medium for coca germination, fine grade if possible. Styrofoam cups are OK, but I prefer small plastic pots, 2"diameter, with holes in the bottom. Seeds should be planted no deeper than one inch. Pots should be raised so as not to saturate the medium. Coca, whether as a seedling or a mature plant, never likes to have wet feet. I think it is better to start them in small pots rather than flats, so there is less damage to the root system when they are transplanted. Forget the hot pad - 1 think it is completely unnecessary. Seedlings usually come up in 2 to 4 weeks if they are viable. 

The experiment will require a balance to determine the mass of a sample and possibly a pipet to measure a volume, from which a mass may be calculated using the density. A calorimeter, usually a polystyrene (Styrofoam) cup, is needed to contain the reaction. Finally, a thermometer is required. Tables of heat capacities or specific heats may be provided. 

Polymers that can be heated and moulded into specific shapes and forms are commonly known as plastics. All plastics are synthetic (artificially made) polymers. For example, polyethene is a common synthetic polymer that is used to make plastic bags. Ethene, CH2 = CH2, is the monomer for polyethene. Adhesives, rubber, chewing gum, and Styrofoam M are other important materials that are made from synthetic polymers. 

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