Styrene-acrylonitrile recycling

A heterogeneous Pd catalyst dispersed on supports such as o-A1203, C, MgO and CaC03 was found to be an recyclable and selective catalyst for heterogeneous Heck arylation (an important method of C-C bond formation - Chapt. 11) of several olefins (styrene, a-methylstyrene, 1-decene, acrylonitrile, etc.) with iodobenzene [45], Scheme 10.5. 

A. Arostegui, M. Sarrionandia, J. Aurrekoetxea, and I. Urrutibeas-coa, Effect of dissolution-based recycling on the degradation and the mechanical properties of acrylonitrile-butadiene-styrene copolymer, Polym. Degrad. Stab., 91(ll) 2768-2774, November 2006. 

R. Balart, L. Sanchez, J. L6pez, and A. Jimenez, Kinetic analysis of thermal degradation of recycled polycarbonate/acrylonitrile-butadi-ene-styrene mixtures from waste electric and electronic equipment,... 

Recycling is another important aspect recycling of ABS and SAN is generally difficult because they have acrylonitrile in their molecule, whereas HIPS-SPS blend is recyclable because its chemical component is styrene. 

To explore the possibility of recycling alkaloid-Os04 complexes, several polymer-bound alkaloid derivatives have been used for heterogeneous catalytic asymmetric dihydroxylations. As chiral ligands, polymerized cinchona alkaloids or copolymers of quinine derivatives with acrylonitrile or styrene were studied [46]. In general, lower select vities and decreased rates were observed. 

The major challenge to all recovery systems will be the increasing level of other plastic types in the feed material. Materials such as ABS (acrylonitrile butadiene styrene) are being used in VRLA battery cases, due to their toughness and rigidity relative to traditional polypropylene. For the recycler, this means that the valuable polypropylene tonnage will fall with a reciprocal increase in plastic types that cannot be recycled. This material will have to be disposed of, as ABS and... 

Acrylonitrile/Butadiene/Styrene (ABS) Acry-lonitrile/butadiene/styrene (ABS) polymers are not true terpolymers. As HIPS they are multipolymer composite materials, also called polyblends. Continuous ABS is made by the copolymerization of styrene and acrylonitrile (SAN) in the presence of dissolved PB rubber. It is common to make further physical blends of ABS with different amounts of SAN copolymers to tailor product properties. Similar to the bulk continuous HIPS process, in the ABS process, high di-PB (>50%, >85% 1,4-addition) is dissolved in styrene monomer, or in the process solvent, and fed continuously to a CSTR where streams of AN monomer, recycled S/AN blends from the evaporator and separation stages, peroxide or azo initiators, antioxidants and additives are continuously metered according to the required mass balance to keep the copolymer composition constant over time at steady state. 

Acrylic resin Acrylonitrilefbutadiene/styrene copolymer Bis (2,4-di-t-butylphenyl) pentaerythritol diphosphite Butadiene/acrylonitrile copolymer EthyleneA/A copolymer Methoxyethyl acrylate Methyl methacrylate butadiene styrene terpolymer Polyethylene elastomer, chlorinated 2-Propenoic acid, 2-methylmethyl ester, polymer with 1,3-butadiene and butyl 2-propenoate impact modifier, PVC rigid EVA/PVC graft polymer impact modifier, recycled polyamides EPDM, maleated impact modifier, thermoplastics Butadiene/acrylonitrile copolymer impact strength modifier PEG-6 trimethylolpropane impact-resistance lights Polyester carbonate resin impact-resistance, lights Polyester carbonate resin impeller... 

RECYCLING OF ACRYLONITRILE/ BUTADIENE/STYRENE COPOLYMERS (ABS) AND OTHER PLASTICS... 

Acrylonitrile-butadiene-styrene (ABS) is one of the most frequently used polymers in the production of electrical and electronic equipment, it also has widespread applications in automobiles, communication instruments and other commodities. Within the electrical and electronic sector, the quantity of recycled plastics could be increased via the recycling of ABS to reduce environmental, economic and energy issues. Table 2.5 illustrates some of the physical parameters of ABS. 

Currently, most WPC are made with PE, both recycled and virgin, for use in exterior building components. However, WPC made with wood-PP are typically used in automotive applications and consumer products, and these composites have recently been investigated for use in building profiles. Wood-PVC composites typically used in window manufacture are now being used in decking as well. Polystyrene and acrylonitrile-butadiene-styrene (ABS) are also being nsed. 

A recent paper by Meyer et indicates that it is the flame retardants that determine the recyclability of a polymer. Engineering plastics such as acrylonitrile-butadiene-styrene which contain PBDE are unsuitable for recycling because of the generation of PBDF and PBDD s. Moldings containing... 

Pd complexes of polymeric diphenylphosphinyl ferrocene are effective catalysts for the hydrosilylation of styrene and 1-hexene by SiHCls. They can be recycled with no loss of activity.Nitrile groups on macroporous copolymers of acrylonitrile/divinylbenzene/ styrene are effective ligands for the immobilization of Rh(I), Pt(II), and Pd(II) complexes, which can be used as hydrosilylation catalysts, with their effectiveness closely related to the morphology of the polymer matrix. Similar transformation was also effected by platinum catalyst immobilized by mercaptan groups over polysiloxane. ... 

---