In ASA, the butadiene component (which gives poor UV resistance) is replaced by an acrylic ester.Without the addition of butyl, ABS becomes, SAN - a similar material with lower impact resistance or toughness. Theacrylonitrile gives thermal and chemical resistance, rubber-like butadiene gives ductility and strength, the styrene gives a glossy surface,ease of machining and a lower cost. ABS is a terpolymer - one made by copolymerising 3 monomers: acrylonitrile, butadiene and syrene. It can be joined by ultrasonic or hot-plate welding, or bonded with polyester, epoxy,isocyanate or nitrile-phenolic adhesives.Technical notes. It is hygroscopic (may need to be oven driedbefore thermoforming) and can be damaged by petroleum-based machining oils.ABS can be extruded, compression moulded or formed to sheet that is then vacuum thermoformed. Integral metallics are possible (as in GE Plastics' Magix.) ABS is UV resistant foroutdoor application if stabilizers are added. ABS has the highest impact resistance of all polymers. ABS-PVC alloys are tougher than standard ABS and, in self-extinguishing grades, areused for the casings of power tools.Design guidelines. Itis usually opaque, although some grades can now be transparent, and it can be given vividcolors. Unstructured information for ABS*What is it? ABS (Acrylonitrile-butadiene-styrene ) is tough, resilient, and easily molded. Structured information for ABS*Acrylonitrile-butadiene-styrene (ABS) - (CH2-CH-C6H4)nGeneral PropertiesDensityPrice1.05 2.1 -1.07 Mg/m 32.3 US /kgElectrical PropertiesConductor or insulator?Good insulatorOptical PropertiesMechanical PropertiesYoung's ModulusElastic LimitTensile StrengthElongationHardness - VickersEndurance LimitFracture Toughness1.1182766111.2Transparent or 7515100.24K10-6/KJ/kg.KW/m.KThermal PropertiesMax Service TempThermal ExpansionSpecific HeatThermal Conductivit圓507015000.17OpaqueCorrosion and Wear ResistanceFlammabilityFresh WaterOrganic SolventsOxidation at 500CSea WaterStrong AcidStrong AlkalisUVWearAverageGoodAverageVery PoorGoodGoodGoodGoodPoor links to processesME 474-674 Winter 2008Slides 2-CES -4
Organizing information: the MATERIALS TREEKingdomFamily Ceramics& glassesMaterials Metals& loys Polymers& 5000600070008000 Density informationMaterial recordsME 474-674 Winter 2008Slides 2-CES -3 The structure of the CES Edu cs & glassesMetals & -tableME 474-674 Winter 2008Slides 2-CES -2 The CES EduPack SoftwareThe CES EduPackLevel 1Level 21st year students:Engineering, MaterialsScience, Designz64 materials, 75 lymerengineeringengineering2nd - 4th yearstudents of Engineeringand Materials Scienceand Design.z94 materials, 107 gME 474-674 Winter 2008Level 34th year, mastersand research studentsof EngineeringMaterials and Design.z2916 materials, 233 des 2-CES -1
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