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Antioxidants University of North Carolina at Wilmington PowerPoint Presentation

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Slide 1 -

1 CHM 585 /490 Chapter 12 Additives

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2 Chapter 12 Additives Antioxidants UV stabilizers Antistatic Agents Peroxides Lubricants FR Heat stabilizers

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3 Antioxidants Antioxidants retard the oxidative degradation of plastics which is initiated when free radicals are created in the polymer by heat, UV, mechanical shear, or metallic impurities

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4 Antioxidants $160 million in U.S. Hindered phenols Phosphites Thioesters

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5 Hindered Phenols BHT has FDA approval and is relatively inexpensive But volatile and may cause discoloration

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6 Less Volatile Hindered Phenols

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7 Phosphites Often used as costabilizers with hindered phenols

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8 Thioesters S(CH2CH2CO2R)2 Often used with hindered phenols

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9 UV Stabilizers $130 Million in U.S. Preferential UV absorbers Absorb preferentially to the polymer and dissipate the absorbed energy without harm to the polymer Quenching Agents Metal chelates that convert the excess energy absorbed to heat

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10 UV Stabilizers Free Radical Terminators Radical scavengers that both inhibit the propagation of free radicals and act as a scavenger Hydroperoxide Decomposers Metal chelates and hindered amines that prevent the formation of free radicals by stabilizing hydroperoxides

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11 Preferential UV absorbers

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12 Hindered Amine Light Stabilizers HALS

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13 Antistatic Agents Static electricity can build up on the surface of polymers and needs to be dispersed to avoid the possibility of sparking, the accumulation of dust and other complications

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14 Antistatic Agents Typically hygroscopic chemicals such as ethoxylated amines

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15 Peroxides For polymerization of PVC LDPE ABS For crosslinking resins As hardeners for unsaturated polyester resins(thermoset polyester)

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16 Lubricants Internal lubricants to improve flow External to enhance mold release Typically long hydrocarbon chain with a polar end

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17 Lubricants Fatty acid amides Fatty acid esters Fatty acids Fatty acid salts Waxes

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18 FR

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21 Flame Retardants Chemicals used to retard ignition and burning of plastics Worldwide market $2.5 Billion FR additives enable plastics to meet various fire safety and performance standards imposed upon them. UL

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22 FR Mechanisms Absorbing heat by the release of water Forming an insulating char on the substrate which starves the fire Interfering with the chemical reactions that maintain the fire and promote the spread of flame

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23 Absorbing heat by the release of water Alumina Trihydrate Al2O3.3H20 Largest volume FR in the U.S. 240,000 metric tons ATH used in polyacrylates ( e.g. Dupont’s Corian), thermoset polyester resins, polyolefins and PVC

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24 Forming an insulating char on the substrate which starves the fire Phosphorous flame retardants Phosphate esters (RO)3PO PVC, Polyurethanes, PPO

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25 Interfering with the chemical reactions that maintain the fire and promote the spread of flame Halogenated compounds Brominated aromatics most common Nylons, polyesters, styrenics, polyolefins

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26 Halogenated FR “Free radical capture" process - takes place in the vapor phase. On combustion at a temperature of over 600° F, the halogen forms hydrochloric or hydrobromic acid that reacts with the antimony oxide to form antimony trihalide or antimony oxyhalide. The flame retarding action takes place in the vapor stage above the burning material. It is thought that "free radicals propagate" the flame. Antimony trihalides or antimony oxyhalides act as "free radical traps", and take up free radicals.

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27 1 + 1 = 3 ! Synergy

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28 Heat Stabilizers Used for PVC > $200 M business in U.S. Various barium, cadmium, tin compounds that scavenge reactive organic chlorine bonds thereby preventing catastrophic dehydrochlorination

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29 Fillers Glass fibers Nickel Clay Prevent shrinkage Mica Pigments

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30 Other Additives Nucleating agents Clarifiers Impact Modifiers Antimicrobial agents

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