Acrylics reprocessing

Addition polymers, such as vinyls, acrylics, fluoroplastics, and polyolefins, can hardly be reprocessed except that, if they are sorted, they maybe converted into powder by grinding operation and mixed with respective virgin resins for remolding into finished goods or, in some cases, blended with other resins using suitable compatibilizers to make useful end-products of commercial value. 

Cocopropylenediamine N,N-Dimethyl-N-cyclohexylamine Neopentanoic acid Octyl acrylate Soyaminopropylamine N-Tallow-1,3-diaminopropane dioleate Tallow propylene diamine fuel oil additive, residuai Magnesium hydroxide fuel oil agent Magnesium sulfonate fuel oil source Gilsonite fuel oil, additive N-Oleyl-1,3-propanediamine fuel reprocessing, nuciear Hydrazine... 

Acrylics undergo a similar type of degradation process as shown in Figure 13.6 to produce monomers from the depolymerisation, and the elimination of substituents. The exception is poly(methyl methacrylate) which degrades exclusively and rapidly under moderate conditions by depolymerisation to the monomer. Even if the discoloration reactions are not apparent, the presence of colouring agents added to the original material will mean the reprocessed product will be dark coloured. 

Acetic acid, removal using emulsion liquid membranes, 215 Acrylic acid, use in plasma graft polymerization, 254-268 Acrylic acid grafted membranes, use in facilitated transport, 250-264 Actinide, separation from reprocessing wastes with liquid membranes, 391-406 Acyclic ligands, 167,168/... 

Elastomeric networks with thermoreversible linkages are receiving growing interest as it is possible to reprocess them several times by simple reheating. In this field, thermoplastic elastomers (ABS) [63] and iono-mers (Surlyn) [64] have been widely developed and applied. Several attempts have been reported to apply the same principles to statistical copolymers of ethylene with maleic anhydride or acrylic and methacrylic acids [65], crosslinked with diols and/or ethoxylamines [66]. The idea which sustained these papers was to take advantage of the thermoreversibility of ester linkage. 

There are recycling opportunities for other plastics beyond the few recognized by SPI RICs. The automobile industry, for instance, utilizes a series of engineering thermoplastics that have a built-in market if they can be recovered and reprocessed. These high value plastics include polyamides (Nylon 6, Nylon 6,6, etc.), polycarbonates (PC), acrylics (PMMA), styrenics (ABS), and blends (TPO, PC/PBT, PC/ ABS, etc.). Their higher value and demand allow recyclers the opportunity to practice more exotic recovery procedures and still have an economically viable product. 

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