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Igoa o oloa:polyurethane

Fua mole mole oloa:

Meatotino tau vailaau:

Polyurethanes na muamua gaosia ma suʻesuʻeina e Dr. Otto Bayer i le 1937. O le polyurethane o se polymer lea o loʻo i ai i le iunite toe fai se vaega o le urethane. Urethanes o ni mea e maua mai i carbamic acids o loʻo i ai naʻo le foliga o latou esters[15]. O le aoga tele o le PU o le filifili e le o aofia ai na o carbon atoms ae o heteroatoms, okesene, carbon ma nitrogen [4]. Mo fa'aoga tau alamanuia, e mafai ona fa'aogaina se polyhydroxyl compound. E fa'apena fo'i, e mafai ona fa'aogaina fa'atasiga o le nitrogen poly-functional i feso'ota'iga amide. E ala i le suia ma fesuiaʻi le polyhydroxyl ma polyfunctional nitrogen compounds, eseese PU e mafai ona faʻapipiʻiina [15]. Polyester po'o polyether resins o lo'o i ai vaega hydroxyl e fa'aaogaina e gaosia ai le polyesteror polyether-PU, fa'asologa [6]. O fesuiaiga i le numera o suitulaga ma le va i le va ma totonu o filifili lala e maua ai PU mai le laina laina i le lala ma le 9exible i le malo. Linear PU o loʻo faʻaaogaina mo le gaosiga o alava ma faʻailoga [6]. E faʻaaogaina PU faʻalelei i le gaosiga o mea faʻapipiʻi ma faʻapipiʻi [5]. O palasitisi faʻafefete ma faʻamalosi, lea e aofia ai le tele o PU na gaosia, e mafai ona maua i ituaiga eseese i alamanuia[7]. I le fa'aaogaina o le mole mole mole prepolymers, e mafai ona gaosia poloka copolymers eseese. Ole vaega ole hydroxyl e mafai ona fa'aogaina poloka poloka, e ta'ua o vaega, e fa'aofi i totonu ole filifili PU. O fesuiaiga i nei vaega e mafua ai le eseese o tikeri o le malosi ma le elasticity. O poloka e maua ai le vaega tioata malō ma o loʻo i ai le faʻalauteleina o filifili e taʻua o vaega faigata[7]. O i latou e maua mai se vaega pa'u amorphous ma o lo'o iai le polyester/polyether e ta'ua o vaega vaivai. Fa'apisinisi, o nei poloka polymers ua ta'ua o Pus vaega

Talosaga:

Polyurethanes o se tasi o mea sili ona faʻaogaina i le lalolagi i aso nei. O le tele o latou faʻaoga e afua mai i le foam fetuutuunai i meaafale faʻapipiʻiina, i le foam malo e pei o le puipui i puipui, taualuga ma mea faigaluega i polyurethane thermoplastic faʻaaogaina i masini faʻafomaʻi ma seevae, i paʻu, faʻapipiʻi, faʻamaufaʻailoga ma elastomers faʻaaogaina i luga o fola ma totonu o taavale [17,18]. ]. Polyurethanes ua faʻateleina le faʻaaogaina i le tolusefulu tausaga talu ai i le tele o talosaga ona o latou faʻamafanafanaga, tau aoga, faʻasaoina o le malosi ma le lelei o le siosiomaga. O a nisi o mea e mafua ai ona manaʻomia tele polyurethanes? Polyurethane tumau e saofagā tele i le umi o le ola o le tele o oloa. O faʻaopoopoga o le taamilosaga o le ola o oloa ma le faʻasaoina o punaoa o ni iloiloga taua o le siosiomaga e masani ona fiafia i le filifilia o polyurethanes[19-21]. Polyurethanes (PUs) o loʻo faʻatusalia se vasega taua o polymers thermoplastic ma thermoset ona o latou mea faʻainisinia, vevela, ma vailaʻau e mafai ona faʻaogaina e ala i le tali atu o polyols eseese ma poly-isocyanates.