Styrene acrylonitrile resin (SAN) is a copolymerplastic consisting of styrene and acrylonitrile. It is widely used in place of polystyrene owing to its greater thermal resistance. The chains of between 70 and 80% by weight styrene and 20 to 30% acrylonitrile.[1] Larger acrylonitrile content improves mechanical properties and chemical resistance, but also adds a yellow tint to the normally transparent plastic.[2]
SAN is similar in use to polystyrene. Like polystyrene itself, it is optically transparent and brittle in mechanical behavior. The copolymer has a glass transition temperature greater than 100 °C owing to the acrylonitrile units in the chain, thus making the material resistant to boiling water. It is structurally related to ABS plastic, where polybutadiene is copolymerised with SAN to give a much tougher material. The rubber chains form separate phases which are 10-20 micrometers in diameter. When the product is stressed, crazing from the particles helps to increase the strength of the polymer. The method of rubber toughening has been used to strengthen other polymers such as PMMA and nylon.
Usesedit
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Uses include food containers, water bottles, kitchenware, e.g., blenders and mixers, healthcare materials, cosmetic jars, computer products, packaging material, household equipment e.g., shower trays, battery cases and plastic optical fibers.
Health risksedit
This section needs expansion. You can help by adding to it. (June 2017)
This section is missing information about what amounts exactly; whether these amounts cause cancer in mice. Please expand the section to include this information. Further details may exist on the talk page.(January 2024)
The acrylonitrile from SAN containers has been found to migrate to content in variable amounts.[3] Acrylonitrile is classified as a Class 2B carcinogen (possibly carcinogenic) by the International Agency for Research on Cancer (IARC).[4] Acrylonitrile has been shown to increase rates of cancer appearance in high dosage tests in male and female rats and mice.[5]
Referencesedit
^"Ullmann's Encyclopedia of Industrial Chemistry". Vol 29. Polystyrene and Styrene Copolymers. Wiley Online Library. p. 487
^Charles A. Harper, ed., Modern Plastics Handbook, ISBN0-07-026714-6, 2000.
styrene, acrylonitrile, resin, styrene, acrylonitrile, resin, copolymer, plastic, consisting, styrene, acrylonitrile, widely, used, place, polystyrene, owing, greater, thermal, resistance, chains, between, weight, styrene, acrylonitrile, larger, acrylonitrile,. Styrene acrylonitrile resin SAN is a copolymer plastic consisting of styrene and acrylonitrile It is widely used in place of polystyrene owing to its greater thermal resistance The chains of between 70 and 80 by weight styrene and 20 to 30 acrylonitrile 1 Larger acrylonitrile content improves mechanical properties and chemical resistance but also adds a yellow tint to the normally transparent plastic 2 Styrene acrylonitrile Names Other names SAN Identifiers CAS Number 9003 54 7 Y ChemSpider none ECHA InfoCard 100 127 519 EC Number 618 369 7 CompTox Dashboard EPA DTXSID50895140 Properties Chemical formula C8H8 n C3H3N m Molar mass variable Except where otherwise noted data are given for materials in their standard state at 25 C 77 F 100 kPa N verify what is Y N Infobox references Contents 1 Properties 2 Uses 3 Health risks 4 ReferencesProperties editSAN is similar in use to polystyrene Like polystyrene itself it is optically transparent and brittle in mechanical behavior The copolymer has a glass transition temperature greater than 100 C owing to the acrylonitrile units in the chain thus making the material resistant to boiling water It is structurally related to ABS plastic where polybutadiene is copolymerised with SAN to give a much tougher material The rubber chains form separate phases which are 10 20 micrometers in diameter When the product is stressed crazing from the particles helps to increase the strength of the polymer The method of rubber toughening has been used to strengthen other polymers such as PMMA and nylon Uses editThis section needs expansion You can help by adding to it August 2017 Uses include food containers water bottles kitchenware e g blenders and mixers healthcare materials cosmetic jars computer products packaging material household equipment e g shower trays battery cases and plastic optical fibers Health risks editThis section needs expansion You can help by adding to it June 2017 This section is missing information about what amounts exactly whether these amounts cause cancer in mice Please expand the section to include this information Further details may exist on the talk page January 2024 The acrylonitrile from SAN containers has been found to migrate to content in variable amounts 3 Acrylonitrile is classified as a Class 2B carcinogen possibly carcinogenic by the International Agency for Research on Cancer IARC 4 Acrylonitrile has been shown to increase rates of cancer appearance in high dosage tests in male and female rats and mice 5 References edit Ullmann s Encyclopedia of Industrial Chemistry Vol 29 Polystyrene and Styrene Copolymers Wiley Online Library p 487 Charles A Harper ed Modern Plastics Handbook ISBN 0 07 026714 6 2000 http www agriculturejournals cz publicFiles 00366 pdf bare URL PDF Re evaluation of Some Organic Chemicals Hydrazine and Hydrogen Peroxide IARC Monographs Volume 71 1999 Acrylonitrile Carcinogenic Potency Database berkeley edu Retrieved from https en wikipedia org w index php title Styrene acrylonitrile resin amp oldid 1193750100, wikipedia, wiki, book, books, library,
