Plastics additives polyacetals

Uses Antioxidant, stabilizer for polyolefins, elastomers, styrenics, polyacetals, cellulosics, polyesters, PU, PVC, petroleum prods., org. substrates, food-grade polymers antioxidant in lubricants for incidental food-contact use Regulatory FDA 21CFR 178.2010, 178.3570 Manuf./Distrib. Ciba Spec. Chems./Plastic Addit. http //www. cibasc. com Trade Name Synonyms Irganox 259 [Ciba Spec. Chems./Plastic Addit. http //www. cibasc. com]... 

To improve the properties of PLA, plasticizers, special additives such as chain-extenders, polymer blends, and composites are commonly investigated. Martin and Averous (10) have studied the effects of various plasticizers on the properties of PLA. Pilla et al. (11-12) have investigated the effects of chain-extenders on the foaming properties of PLA. In addition, a vast number of studies have been conducted to enhance the properties of PLA by blending it with various polymers such as polyethylene oxide (PEO), polypropylene oxide (PPO), polyvinyl acetate, polyolefins, polystyrene, HIPS (high impact polystyrene), polyacetals, polycarbonate, and acrylonitrile butadiene styrene (ABS) (13-26). 

The major disadvantage of chemical depolymerization is that it is almost completely restricted to the recycling of condensation polymers, and is of no use for the decomposition of most addition polymers, which are the main components of the plastic waste stream. Condensation polymers are obtained by the random reaction of two molecules, which may be monomers, oligomers or higher molecular weight intermediates, which proceeds with the liberation of a small molecule as the chain bonds are formed. Chemical depolymerization takes place by promoting the reverse reaction of the polymer formation, usually through the reaction of those small molecules with the polymeric chains. Several resins widely used on a commercial scale are based on condensation polymers, such as polyesters, polyamides, polyacetals, polycarbonates, etc. However, these polymers account for less than 15% of the total plastic wastes (see Chapter 1). 

OTHER COMMENTS used in the production of amino, phenolic, and polyacetal resins used in the manufacture of wood products, plastics, fertilizers and foam insulation used as a preservative, disinfectant and antibacterial food additive. 

The degree of wear/friction improvement depends on the particular plastic to which the PTFE is being added [41], As examples, the above referenced study showed that the addition of 15% low MW PTFE to a 6/6 polyamide, a polyacetal resin, and a polycarbonate reduced the specific wear rates by 97%, 46%, and 97%, respectively. The dynamic friction coefficients were reduced by 76%, 48% and 97%, respectively. Although these are reasonable comparisons, wear and friction performance can depend on the exact contact conditions such as velocity, pressure, and countersurface composition. Commercial compounds of thermoplastics with PIFE will vary depending on the application requirements but an addition level of 15-20% is usually considered optimum for the best wear performance. 

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