White reinforcement

Substitution of carbon black filler (or a significant part of it) with white reinforcing fillers (e.g. silica), as carbon black has also been found to act as a nitrosating agent. 

Bois durd was also a natural polymer. It was made of albumen, usually from ox blood, but sometimes from egg white, reinforced with wood flour. The wood flour was usually from a dark hardwood, which gave the best result. It was compression moulded in heavy, metal moulds. It is a heavier material than most of the plastics, even among the early ones. It is no longer in production. 

White reinforcement This is obtained through the use of silica. Grades are defined by size surface area and method of mannfacture, although there is no universally accepted grading system such as exists for carbon black. A comparison of the effects of silica and carbon black as reinforcing fillers is given in Table 2. In general, unless one needs a non-black rubber, less trouble is experienced with black reinforcement. 

Other uses - Wollastonite is used as an energy-conserving alternative to limestone and sand in the production of glass and glass fiber and as a white reinforcing filler in adhesives and sealants, where it can be used at high loadings. 

Domestic appliances (injection molded parts) White reinforcing filler 30 Very white = 10... 

In concrete, triethanolamine accelerates set time and increases early set strength (41—43). These ate often formulated as admixtures (44), for later addition to the concrete mixtures. Compared to calcium chloride, another common set accelerator, triethanolamine is less corrosive to steel-reinforcing materials, and gives a concrete that is more resistant to creep under stress (45). Triethanolamine can also neutralize any acid in the concrete and forms a salt with chlorides. Improvement of mechanical properties, whiteness, and more even distribution of iron impurities in the mixture of portland cements, can be effected by addition of 2% triethanolamine (46). Triethanolamine bottoms and alkanolamine soaps can also be used in these type appUcations. Waterproofing or sealing concrete can be accompUshed by using formulations containing triethanolamine (47,48). 

Clays. Clay, which is generally considered a mild reinforcing filler, is used sparingly in tires. It is most often used in white sidewalls or in low performance tires. Clay toimage in tires worldwide is estimated at 36,000 t annually. Clay can also be coupled to mbber with silanes, and this is the more popular version used in tires. Even with silane coupling, clays are still a weak reinforcing filler compared to both carbon black and siUca. 

Fillers, eg, clays and whiting, are used to reduce cost or provide special properties. Fillers do not reinforce mbber deposited from latex, excepting to improve abrasion resistance. They are also used to increase viscosity for latex compound spreading suitabiUty. 

Caleadered PVC has approximately 55% of the PVC/PVC alloy segmeat, PVC dispersioa coatiags usiag a reinforcement are 40%, and PVC extmsion with width limitations is about 5%. Almost all PVC membranes are reiaforced or supported with thicknesses from 1.2—2.4 mm (47—96) mils. Converters typically purchase roUstock ia 5—6 ft widths (1.5—1.8 m). Colors and designs are not common most manufacturers offer a soHd white, gray, or tan sheet. 

Large amounts of iaert fillers, such as whiting, talc, and clays, can be added. Very dense fillers, such as barium or strontium sulfates, are used to make compounds intended for sound-deadening appHcations. In contrast, high levels of reinforcing fillers, such as carbon black, produce undesirable properties ia the final product. 

Wood and Wood-Lined Steel Pipe Douglas fir, white pine, redwood, and cypress are the most common woods used for wood pipe. Wood-lined steel pipe is suitable for temperatures up to 82°C (180°F) and for pressures from 1.4 MPa (200 Ibhin ) for the 4-in size, through 0.86 MPa (125 IbFin ) for the 10-in size, to 0.7 MPA (100 Ibf/ in") for sizes larger than 10 in. For fume stacks and similar uses, wood-stave pipe with rods on 0.3-m (1-ft) centers is most satisfactory because it permits periodic tightening. In recent years reinforced plastics have supplanted wood pipe in most applications. 

D. Whiting u. D. Stark, Cathodic Protection for Reinforced Concrete Bridge Decks B Field Evaluation, Final Report, Construction Technology Laboratories, Portland Cement Association, Skokie, Illinois, NCHRP 12-13A (1981). 

Particulate fillers are divided into two types, inert fillers and reinforcing fillers. The term inert filler is something of a misnomer as many properties may be affected by incorporation of such a filler. For example, in a plasticised PVC compound the addition of an inert filler will reduce die swell on extrusion, increase modulus and hardness, may provide a white base for colouring, improve electrical insulation properties and reduce tackiness. Inert fillers will also usually substantially reduce the cost of the compound. Amongst the fillers used are calcium carbonates, china clay, talc, and barium sulphate. For normal uses such fillers should be quite insoluble in any liquids with which the polymer compound is liable to come into contact. 

Fillers. They are generally added to reinforce NBR adhesives. However, fillers can be added to promote tack, to increase the storage life, to improve heat resistance or to reduce cost. The most common fillers are carbon blacks. Precipitated silica can be used in applications where black colour is not acceptable, but excessive amounts tend to reduce adhesion. Titanium dioxide can be used to impart whiteness, improves tack and extend storage life. 

Glass-reinforced aluminum foil with either a bright polished or white lacquer surface is utilized with most types of insulant. Primarily it is used as a vapor control layer or as a means of upgrading the fire properties of plastic foams, but it does give a semi-decorative finish to the insulation. It is therefore often use where the insulation is open to view but located away from direct risk of mechanical damage. 

Currently, breast cancer is the most frequently diagnosed cancer in both white and African-American women. According to latest reports, of the 662,870 cancer cases reported for women in 2005, 32% were breast cancer. The incidence of breast cancer increased from 1 in 20 in 1960 to 1 in 8 today. More than 100,000 women per year require mastectomy for treatment, and every year 75% decide to have reconstmction. About half the number of these women select prostheses made of silica-reinforced silicone-rubber shell filled with silicone gel, while the other half have the same shell filled with physiological saline. Reportedly, gel-fiUed prostheses feel more natural, but are associated with true or perceived health problems and remain highly controversial. 

Foldi, A.P., Design and applications of short fibre reinforced rubbers, in Short Fiber-Polymer Composites, De, S.K. and White, J.R. (Eds.), Woodhead Publishing, Cambridge, 1996, Chapter 9. 

In view of the apparent pleasurable effects of MDMA, it becomes of considerable interest to understand the mechanism of action of substances with a similar effect. Major efforts have been directed toward the study of agents that have an effect on serotonin pathways, since that is the neurotransmitter system that seems most implicated in the mechanism of action of MDMA. This hypothesis is further reinforced by the observation that MDMA substitutes for fenfluramine (Schechter 1986). and fenfluramine substitutes for MBDB (Oberlender and Nichols, unpublished). The substitution data for (+)-amphetamine and cocaine in (-t-)-MBDB-trained rats are also similar to the data for substitution of these agents in fenfluramine-trained rats (White and Appel 1981). 

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