Balloons, latex

Uses The vulcanizates of poly(chloropren) have excellent resistance to weathering and ozone. Neoprene is used for electrical insulating materials, hoses, conveyor belts, flexible bellows, transmission belts, sealing materials, diving suits. Adhesive grades are used in the footwear industry. Latexes are used for dipped goods (e.g. gloves, balloons), latex foam, adhesives, fiber binders. 

In addition to the soHd form of natural mbber it is available as a soHd suspended in water, known as latex. Synthetic mbbers are also available in latex form. Latex has become an important commodity used in the manufacture of dipped goods for health and disease protection. The principal uses of natural mbber are as follows tires and retreading, 70% latex (gloves, balloons), 12% mechanical goods, 9% load-bearing components, 4% and other, 5%. 

The multichannel tube is made from polyvinyl chloride and is 175 cm long, with an external diameter of 5.3 mm. It contains six channels and is provided distally with two 40 mm-long, elongated latex balloons, placed 10 cm apart each of these is separately connected to one of the smaller channels. The two wider channels in the center of the tube are for infusion and aspiration of perfusate. The two remaining... 

This laboratory investigation will help you conceptualize the size of an atom. You will experiment with a latex balloon containing a vanilla bean extract. Latex is a polymer, meaning that it is a large molecule (a group of atoms that act as a unit) that is made up of a repeating pattern of smaller molecules. The scent of the vanilla extract will allow you to trace the movement of its molecules through the walls of the solid latex balloon. 

Explain why helium-filled, Mylar-foil balloons can float freely for several weeks, but latex balloons for less than 24 hours. 

Rubber latex is sensitive to the influence of external forces or chemical agents. Thus, the so-called alligator balloon is formed when solid-colored balloons are dipped in an acid bath causing the balloon to turn into two shades, supposedly like an alligator. The radium balloon is produced by taking a solid-colored balloon and dipping it a second time into another color. 

Balloons today are still made from the rubber latex from the rubber tree using molds. Color is added as desired. 

Latex balloons are made of polymers. The latex near the knot and top of the balloon are not stretched as tightly as latex on the side. This can be seen by observing the transparency of the different parts of the balloon. The knot and top areas of the balloon have a greater polymer density. Therefore, the balloon in these areas has a greater ability to stretch and partially seal itself around the skewer. On the sides of the balloon, the tightly stretched latex cannot seal around the needle and the balloon pops. 

The simplest method for producing a spherical combustion in gases is to place a combustible (but not explosive) gaseous mixture in a thin latex, rubber or plastic balloon and ignite it in the center by means of an electric spark... 

Other than tire use, there are few other significantly large application areas for natural mbber that can be identified, as indicated in Table 10. The use of natural mbber in latex products covers items such as gloves, condoms, balloons, catheters and other dipped goods, latex thread, foam and carpet backing, and rubberized coir and hair. In total, latex goods consume about 11% of world mbber production. Thereafter, there are four categories footwear,... 

Latex applications include adhesives, fibre binders (such as in paper and textiles), coatings (such as in paints, coated papers, coated fabrics, coated flooring, and coated insulation), dipping-produced goods (such as balloons, bladders, gloves, and tubing), solid foam products (such as for cushioned furniture), and as a constituent in building materials (such as mortars and concrete) [791]. 

General comments on Protocols 1-7. A thick wall, natural latex rubber balloon (ca. 2 L) is used. A cryocool system is used for cooling. Commercial anhydrous ZnCI2 is dried under high vacuum at 100°C for 10 h over P205. This can be stored for use for at least ten days. 

AIBN (5.6 mg, 0.034 mmol), NaBH3CN (427 mg, 6.8 mmol), and Bu3SnCl (46.0 mg, 0.17 mmol) were added to a reactor equipped with a Latex balloon. Next, teruBuOH (13.6 ml) and alkyl iodide (3.4 mmol) were added to the reactor, and finally molecular oxygen 1802 (122 ml, 5.1 mmol) was injected and the mixture was heated for 19 h at 60 °C and kept stirred. Then, after the addition of water, the organic layer was extracted with ether four times and dried. After removal of the solvent, the residue was chromatographed on silica gel to give 180-alcohol in 98% yield [57]. 

Latex gloves, balloons, condoms, and other elastomeric products are produced by dipping metal molds into a latex that can consist of either natural or synthetic rubber. The mold is pretreated with a chemical that causes the latex to coagulate on the mold. Then the latex-covered mold passes through an oven where the elastomer cures (crosslinks). A modem factory can produce on the order of a million latex gloves or balloons a day. 

We ve seen rubber balloons all of our lives but have probably never thought about how they are made. In the early nineteenth century, toy balloons were made from pig bladders. Later, they were constructed from solidified natural rubber.Today s latex balloons were invented about 70 years ago by Neil Tillotson, a chemical engineer from New En-... 

Latex balloons are still made in essentially the same way. A metal form shaped like the uninflated balloon is first coated with a chemical that will cause the latex to coagulate on it. The form is immersed upside-down into a vat of latex also containing a crosslinking (vulcanizing) agent, and then dried in an oven to cure the rubber. After the balloon is removed from the mold, it is ready to be imprinted or packaged. A modern, automated factory can turn out a million or so latex balloons a day. 

Polymer solutions and dispersions find many practical applications. We can cast films from some polymers, and we use many others to form coatings. Coatings can be produced from either solutions or dispersions such as polymer emulsions (latexes). Examples include paint, varnish, textile finishes, adhesives, and floor waxes. Other useful latex products are latex gloves, condoms, and balloons. 

Gastric motility can be measured by balloon manometry of the Heidenhain pouch in the conscious dog. The animals are deprived of food for 18 hours before the experiment, but water is allowed ad libitum. A latex balloon, connected via a polyethylene catheter to a pressure transducer (Statham P 23 BB), is introduced through the fistula cannula into the accessory stomach. Changes in intragastric pressure... 

Reactions to other constituents of barium sulfate enemas have been recognized (SEDA-18, 441) and could be as common as one in 1000. They vary from urticarial rashes to severe anaphylactic reactions, and can be particularly severe in patients with asthma (13). Hypersensitivity to the latex balloon catheter used in double contrast barium enemas appears to be a common mechanism (14), but hypersensitivity to glucagon, to the preservative methylparabens, or to other additives seems to be responsible in some cases. Insofar as the latex balloon is concerned, thorough washing will remove the allergen responsible for the reaction (15). 

Place a thin-walled latex balloon in the left ventricle via the left atrium, and connect it to a pressure transducer to measure left ventricular developed pressure (LVDP) (systolic-diastolic) and the electronically derived dp/dt. 

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