Styrene maleic anhydride

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Styrene maleic anhydride
Styrene Maleic Anhydride
Names
IUPAC name
Poly(Styrene-co-Maleic Anhydride)
Other names
SMA; XIRAN
Identifiers
ECHA InfoCard
 100.211.126 Edit this at Wikidata
Properties
(C8H8)n-(C4H2O3)m
Molar mass Variable
Appearance crystal clear polymer
Density 1.080 g/cm3
Solubility Soluble in alkaline solutions and polar organic solvents
1.577
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Styrene maleic anhydride (SMA or SMAnh) is a synthetic

organic peroxide
as the initiator. The main characteristics of SMA copolymer are its transparent appearance, high heat resistance, high dimensional stability, and the specific reactivity of the anhydride groups. The latter feature results in the solubility of SMA in alkaline (water-based) solutions and dispersion.

SMA is available in a broad range of molecular weights and maleic anhydride (MA) contents. In a typical combination of those two properties, SMA is available as a crystal clear granule that can be used in a wide variety of applications. SMA polymers with a high

PVC
. The solubility of SMA in alkaline solutions makes it suitable for various applications in the field of sizings (paper), binders, dispersants and coatings. The specific reactivity of SMA makes it a suitable agent for compatibilizing normally incompatible polymers (e.g. ABS/PA blends) or cross-linking. The glass transition temperature of Styrene maleic anhydride is 130 - 160 °C.

SMA producers

There are only a few commercial suppliers of SMA polymers. The three major producers are Solenis (Scripset), Aurorium (Xiran), Sartomer (SMA). Nova Chemicals (Dylark) is no longer produced. While the Sartomer product range covers low molecular weight products with high MA contents (and sometimes chemically modified), the Nova materials are high molecular products with low MA content (and mainly impact modified). Aurorium's Xiran product range covers the full spectrum of SMA polymers, including chemically modified types. Each of those products have their own specific features.

SMA and male contraception (RISUG)

SMA can be combined with the solvent

dimethylsulfoxide (DMSO) in an application known as reversible inhibition of sperm under guidance (RISUG).[2] The process is under phase III clinical trials in India and is a non-surgical method of male sterilization that is inexpensive, highly effective, and reversible. It involves an injection of the solution into each of the patient's Vas deferens, which forms a layer around the vas walls partially (but not completely) blocking the flow of sperm cells. As cells pass by the substance, they are rendered inactive. If approved for widespread application, it could provide an alternative to the current two major methods of male contraception: condoms or vasectomies.[3]

References

  1. doi:10.1021/ma00143a002
    .
  2. ^ "RISUG". MaleContraceptives.org. International Male Contraception Coalition. Retrieved 12 September 2014.
  3. ^ Gifford, Bill (26 April 2011). "The Revolutionary New Birth Control Method for Men". Wired. Archived from the original on 30 April 2011. Retrieved 21 July 2023.
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