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ПОЛИСТИРОЛ-В-полибутадиена-В-ПОЛИСТИРОЛ

ПОЛИСТИРОЛ-В-полибутадиена-В-ПОЛИСТИРОЛ структура
9003-55-8
CAS №
9003-55-8
Химическое название:
ПОЛИСТИРОЛ-В-полибутадиена-В-ПОЛИСТИРОЛ
английское имя:
Styrene Butadiene Rubber
Синонимы:
sbs;SBR;STYRENE-BUTADIENE RUBBER;STYRENE/BUTADIENE COPOLYMER;dienols;ricon100;styrene-butadienepolymer;styrene-1,3-butadienecopolymer;Polymerized Styrene Butadiene Rubber;Styrene-butadiene rubber,oil-extended
CBNumber:
CB7476376
Формула:
(C8H8.C4H6)x
молекулярный вес:
158.24
MOL File:
9003-55-8.mol

ПОЛИСТИРОЛ-В-полибутадиена-В-ПОЛИСТИРОЛ атрибут

Температура плавления: 253 °C
плотность: 1.04 g/mL at 25 °C
показатель преломления: 1.57
растворимость: растворители с параметрами растворимости от 7,7 до 9,4: растворим
форма: плита / кусок
Вязкость: 1.0(Intrinsic viscosity)
Вязкость: 4,000cp (25 wt% in toluene @ 25C)(Brookfield viscosity)
Стабильность:: Стабильный. Горючий. Несовместим с сильными окислителями.
InChI: InChI=1S/C8H8.C4H6/c1-2-8-6-4-3-5-7-8;1-3-4-2/h2-7H,1H2;3-4H,1-2H2
ИнЧИКей: MTAZNLWOLGHBHU-UHFFFAOYSA-N
SMILES: C(=C)C=C.C(C1C=CC=CC=1)=C
LogP: 2.700 (est)
Вещества, добавляемые в пищу (ранее EAFUS): BUTADIENE-STYRENE RUBBER
FDA 21 CFR: 172.615; 175.125; 175.300; 177.1200; 177.2600; 177.2800; 181.30
МАИР: 3 (Vol. 19, Sup 7) 1987
Система регистрации веществ EPA: Styrene 1,3-butadiene polymer (9003-55-8)
UNSPSC Code: 12162002
NACRES: NA.23

Заявления о рисках и безопасности

WGK Германия 3
RTECS WL6478000
TSCA TSCA listed

ПОЛИСТИРОЛ-В-полибутадиена-В-ПОЛИСТИРОЛ химические свойства, назначение, производство

Химические свойства

solid or viscous liquid, depending upon the degree of polymerisation

Использование

Molded or extruded into toys, packaging, appliances, communication cassettes, dinnerware and serviceware.

Методы производства

SBR is prepared mainly by emulsion and solution polymerization in a free-radical process with a mercaptan, such as dodecylmercaptan, which is used as a chain-transfer agent to control molecular weight. In the emulsion process, a soapstabilized water emulsion of styrene and butadiene is polymerized in continuous reactors to form SBR elastomer. “Cold” SBR is produced at a temperature of 5–10°C, and “hot” SBR at about 50°C . Solution SBR is typically made in hydrocarbon solution with an n-butyllithium initiator. The major differences between emulsion and solution styrene–butadiene are in the linearity and molecular-weight distribution of the polymer chains. In nonpolar solvents, the tendency is to produce block copolymer, but random copolymers are formed in polar solvents. SBR can be vulcanized similar to natural rubber but generally requires less sulfur and is more accelerated because of its lowunsaturation.

Опасность

Questionable carcinogen.

Угроза здоровью

Styrene Butadiene Rubber is prepared in large quantities for tire treads and other, similar uses. The properties, molecular weight, and percentage of monomer can all be controlled in the polymerization process. Hazards of the SBR industry have been identified and related mostly to the monomers and additives. Contact dermatitis and leukemia have been associated with solvent and additive use but not with the actual polymer itself (Checkoway et al., 1984; Kilpikari, 1982). Epidemiological studies in the industry have not revealed a significant increase in disease or causes of death (Matanoski and Schwartz, 1987; Meinhardt et al., 1982). The hazards of the butadiene and styrene monomers were discussed previously.

Профиль безопасности

An eye irritant. Questionable carcinogen. When heated to decomposition it emits acrid smoke and irritating fumes. See also POLYMERS, INSOLUBLE.

ПОЛИСТИРОЛ-В-полибутадиена-В-ПОЛИСТИРОЛ препаратная продукция и сырье

сырьё

препарат


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