Styrene-aciylonitrile copolymers

Kambour, R. P. and Gruner, C. L., Effects of polar group incoiporation on crazing of glassy polymers styrene-aciylonitrile copolymer and a bisphenol polycarbonate, J. Polym. ScL, Polym. Phys. Ed., 16, 703 (1978). 

Most practical problems are concerned not with short-term faQure in active environments, but with long-term crazing in relatively mild environments. Modification of the chemical structure is often sufficient to overcome this problem. For example, pofys ene crazes at low strains in air and at even lower strains in a range of liquid environments, whereas styrene-aciylonitrile copolymers (SAN) are more resistant. The nitrile group (—C=N) carries an electric dipole which provides additional intermolecular attractions, thereby both increasing the stresses necessary to cause cavitation, and at the same time reducing the absorption of non-polar liquids (S.N.3). 

Lustran SAN Styrene-aciylonitrile copolymer Monsanto Chem. Co. 

S.G. Karpova, Y.A. Naumova, L.R. Lyusova, E.L. Khmeleva, A.A. Popov, The effect of solvents on the structural-dynamic characteristics of films and nonwoven materials based on pol5mrethane, the styrene-aciylonitrile copolymer, and their blends. Polymer Science - Series A 57 (3) (2015) 330-342. 

Aciylonitrile-butadiene-styrene (ABS) copolymer, an important rubber-toughened thermoplastic, is widely used owing to its favorable cost/performance ratio. The advantages of ABS include its luster and resistance to impact [1-2]. ABS is therefore used in various instruments and structures for small elemental parts as well as large structural ones. In spite of... 

Many hundreds of diene polymers were investigated for their suitability as elastomers. Only three of these have achieved widespread commercial acceptance butadiene-styrene copolyipers, butadiene-aciylonitrile copolymers, and poly-2-chlorobutadienes. Other essentially non-diene elastomers such as butyl rubber from isobutene, Thiokol from ethylene dihalides and polysulfides, and silicones have become important for special applications. 

Acrylonitrile-butadiene rubber, NBR, styrene-aciylonitrile rubber, SAN, ethylene-vinyl acetate copolymer, EVA, and acrylic copolymers are helpful modifications of polyvinylchloride that change its processing characteristics and elastomeric properties. Blending with these copolymers helps to reduce the requirement for low molecular weight plasticizers. Ethylene-vinyl acetate copolymer plays a role of high molecular weight plasticizer in production of vinyl hose. This reduces the amount of DOP used in flexible hose applications. Ethylene copolymer is used plasticize PVC that reduces gel. "" Phthalate plasticizers can be eliminated from water based adhesives because of utilization of vinyl acetate ethylene copolymer as a high molecular plasticizer/modifier. " ... 

Plastics—Plasticized Compounds of Homopolymers and Copolymers of Vinyl Chloride (PVC-P)—Part 2 Preparation of Test Specimens and Determination of Properties Plastics—Styrene/Aciylonitrile (SAN) Moulding and Extrusion Materials—Part 1 Designation System and Basis for Specifications... 

Copolymers of Styrene. For thermoplastic apphcations, the largest volume comonomer for acrylonitrile is styrene. Styrene-aciylonitrile copolsrmers are designated SAN. SAN copolymers are discnssed in detail in the later part of this article. 

Buna-N Is a copol5mier of 1,3-butadIene and aciylonitrile and Buna-S is a copolymer of 1,3-butadIene and styrene. 

There is an important categoiy of free-radical emulsion polymerizations where the hydrophobic polymer does not dissolve in its own monomer [3-6] or is only sparingly soluble in its own monomer [3]. Some examples of these kinds of polymerizations are the emulsion polymerization of fluorinated monomers (e.g. tetrafluoroethylene (TFE), chlorotrifluoroethylene (CTFE), 1,2-difluoroethylene) [4,5] and acrylonitrile [6]. The polymers formed by these polymerizations all have significant industrial importance, particularly as engineering polymers (e.g. Teflon, aciylonitrile-butadiene-styrene copolymer (ABS)). As a result much of the research into these processes remains outside the public domain. 

Aciylonitrile/butadlene/styrene copolymer latex, paints... 

AciyKc resin, Aciylonitrile/butadiene/styrene copolymer, Chemstat 327 Dimodan PM Ethylene distearamide. Hydrogenated cottonseed glyceride. Hydrogenated palm glyceride, Lanco A 1601 Lubral 2522 Lubral 2544 Lubral 5005 Lubral 5011 Microthene FA 700-00 Mcrolhene FA 7094X) Maothene FE 532-00 Mcrothene FN 5004X) Mcrothene ... 

The material can be converted to diazonium salts and then decon x)sed with ferrous ions in the presence of some vinyl monomers to form graft copolymers. Aciylonitrile forms graft copolymer readily without formation of any homopolymers. Styrene and vinyl acetate, however, do not A modification of this technique is to conduct the diazotization reaction in the presence of emulsifiers. The amounts of graft copolymers that form with acrylic and methacrylic monomers and A vinylpyrrolidone depend upon the nature and pH of the emulsifiers, the reaction time, and the temperature. 

Polymers of average polarity have solubility parameters in the range between 17 and 20 (MJ/m )°. Polyethers, polyurethanes, polyesters, and copolymers of aciylonitrile, vii rlchloride, styrene, and maity other are typical representatives of this group. 

Polycarbonate/ acrylonitrile-butadiene-styrene copolymer or aciylonitrile-ethylene-propyl-ene-styrene alkyl vinyl ethers copl5rmer, PC/ABS or AES (ABS or AES/polycarbonate) STRUCTURE Dispersed... 

Most commercial copolymers of styrene and aciylonitrile, known as SAN, are about 75 wt% styrene and 25 wt% acrylonitrile. Compared to the polymer in Problem 11.3 (which is 75 wt% acrylonitrile, 25 wt% styrene), why is this copolymer much easier to make at approximately uniform composition ... 

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