Lesson 21　Epoxy Resins

    Theepoxyresinshavesteadilygrownintheiruseintheplasticsandrelatedindustriesduetothevarietyofformsinwhichtheymaybeprocessed.Asthermosettingmaterials,theyarecuredorcross-linkedbytheadditionofahardenertotheoriginalliquidresin+①.Therepeatingmolecularstructurei......查看详细>>

标签:聚合物科学与工程

Lesson 22　Thermosetting Materials and Phenol Formaldehyde Resins

    ThermosettingMaterials:Thermosettingmaterialsdifferfromthermoplasticsinmanyways.Basicallythedifferencesareduetothechemicalcondensationpolymerizationprocessthroughwhichthethermosettingmaterialsareproducedthatresultsintheirspecialcharacteristics+①.Thedefini......查看详细>>

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Lesson 23　The Historical Development of Rubber

    Ofallthematerialsprovidedbynatureformantouseasamaterialofconstruction,naturalrubberisunique.Thecharacteristicofhighreversibleextensibilityfascinatestheenquiringmind.AstheyearshavepassedsinceitsintroductiontotheEasternHemispherebyColumbusandhisfellowexplor......查看详细>>

标签:聚合物科学与工程

Lesson 24　Rubber Materials

    Thematerialsusedinthesecategoriesallhavefinitedutiestoperformwithinarubberformulation.Therefore,eachwillbediscussedinthesequencealreadylistedearlierinlasttwolessons.Rubbers(hydrocarbon):　Reclaimrubbercanplayanimportantpartinthefunctionofgeneralorspecialis......查看详细>>

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Lesson 25　Synthetic Fibers(1)

    Syntheticfiberscanbeproducedfromawidevarietyofsubstances:polyesters,polyamides,vinyls,etc.Thesamematerialcanoftenbeusedinmoldingaswellasspinningprocesses.Someofthepolymers,especiallythosewhicharesuitablethermoplastics,arelargelyofpetroleumorigin;others,su......查看详细>>

标签:聚合物科学与工程

Lesson 26　Adhesives

    Adhesiveshavebeenatechnologicallyimportantapplicationofpolymersforthousandsofyears.Manyoftheearlynaturaladhesivesarestillused.Theseincludestarchandprotein-basedformulationssuchashydrolyzedcollagenfromanimalhides,hooves,andbonesandcaseinfrommilk.Asnewadhes......查看详细>>

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Lesson 27　Introduction to Plastics Molding and Processing

    Theresinmanufacturingindustriesarethoseconcernedwithconvertingrawmaterialsintochemicalcompoundswhicharefurtherprocessedintothevariousplasticsresins.Theseresinsareproducedinmanyforms;asgranules,powders,liquidsorpastes,readytobesoldtocompanieswhichwillproce......查看详细>>

标签:聚合物科学与工程

Lesson 28　Injection Molding

    Manydifferentprocessesareusedtotransformplasticgranules,powders,andliquidsintofinalproducts.Theplasticmaterialisinmoldableform,andisadaptabletovariousformingmethods.Inmostcasesthermoplasticmaterialsaresuitableforcertainprocesseswhilethermosettingmaterials......查看详细>>

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Lesson 29　Extrusion

    Thermoplasticitemswithauniformcrosssectionareformedbyextrusion.Thisincludesmanyfamiliaritemssuchaspipe,hoseandtubing,gaskets,wireandcableinsulation,sheeting,window-framemoldingsandhousesiding.Moldingpowderisconveyeddownanelectricallyoroil-heatedbarrelbyar......查看详细>>

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Lesson 30　Blow Molding

    Blowmoldingisaprocessusedtoproducethin-wallhollowthermoplasticparts.Acylinderortubeofplastic,calledaPARISON,isplacedbetweenthejawsofamold.Themoldisclosedtopinchofftheendsoftheheatedplasticandcompressedairpressureisusedtoforcethematerialagainstthemoldfaces......查看详细>>

标签:聚合物科学与工程