Qhov sib txawv tseem ceeb ntawm polysulfone thiab polyethersulfone yog polysulfone yog ib pawg ntawm cov thermoplastic polymers uas muaj cov rov ua dua nrog ib pab pawg sulfone, hos polyethersulfone yog ib pawg ntawm cov thermoplastic polymers uas muaj cov subunit aryl-SO2-aryl qauv.
Muaj peb hom polysulfone loj uas muaj txiaj ntsig kev lag luam: polysulfone (PSU), polyethersulfone (PES), thiab polyphenylene sulfone (PPSU). Peb tuaj yeem siv cov ntaub ntawv no rau kev siv hauv qhov kub ntawm -100 txog +200 degrees Celsius. Lawv kuj muaj txiaj ntsig zoo hauv cov khoom siv hluav taws xob, kev tsim kho tsheb, thiab kev siv tshuab kho mob.
YPolysulfone yog dab tsi?
Polysulfone yog tsev neeg ntawm cov thermoplastics ua haujlwm siab. Cov polymers no tseem ceeb heev vim lawv lub zog thiab ruaj khov ntawm qhov kub thiab txias. Polysulfones uas siv technically muaj xws li aryl-SO2- aryl subunit. Txij li tus nqi siab heev kom tau txais cov khoom siv raw thiab cov txheej txheem polysulfones, cov ntaub ntawv no tau siv rau hauv cov ntawv tshwj xeeb, thiab feem ntau cov no yog siv los ua cov khoom siv zoo tshaj plaws rau polycarbonates.
Daim duab 01: Lub Chaw Rov Ua Haujlwm ntawm Polysulfone
Polysulfone tebchaw yog tsim los ntawm polycondensation cov tshuaj tiv thaiv ntawm diphenoxide thiab bis (4-chlorophenyl)sulfone. Nyob rau hauv cov tshuaj tiv thaiv no, sulfone functional pab pawg neeg activates chloride pawg mus hloov. Ntxiv mus, diphenoixde yog tsim nyob rau hauv situ los ntawm diphenol thiab sodium hydroxide.
Thaum xav txog cov khoom ntawm polysulfone cov khoom sib txuas, cov no yog cov tawv tawv, lub zog siab, thiab cov ntaub ntawv pob tshab uas tuaj yeem ua rau muaj zog thiab nruj, thiab cov khoom no tau khaws cia ntawm -100 txog 150 degrees Celsius. Tsis tas li ntawd, lub iav hloov pauv kub ntawm 190 thiab 230 degrees Celsius. Qhov seem stability ntawm polysulfones yog siab, thiab qhov luaj li cas hloov thaum nws raug rau boiling dej los yog 150 degrees Celsius cua los yog chav dej uas feem ntau poob qis dua 0.1%.
Ntxiv mus, cov khoom no muaj zog tiv taus cov ntxhia acids, alkali, thiab electrolytes hauv pH qhov tseem ceeb ntawm 2 txog 13 thiab kuj tiv taus cov tshuaj oxidizing. Yog li, peb tuaj yeem siv cov khoom no tiv thaiv cov tshuaj dawb. Tsis tas li ntawd, polysulfones yog resistant rau surfactants thiab hydrocarbon roj, thiab tsawg polar organic solvents.
YPolyethersulfone yog dab tsi?
Polyethersulfone (PES) yog qhov thib ob feem ntau siv cov khoom siv membrane hauv cov membrane bioreactor (MBR) uas yog siv rau hauv cov txheej txheem kho dej khib nyiab. Polyethersulfone muaj cov qauv tshuaj uas ether bonds thiab sulfone bonds feem ntau txuas nrog phenyl. Lub tshav kub tsis kam ntawm cov khoom no yog nruab nrab ntawm bisphenol A polysulfone thiab polyarylethersulfone.
Cov khoom siv no muaj cov ntsiab lus melting ntau dua thiab thermal stability piv rau lwm cov ntaub ntawv polymeric los ntawm tsuas yog 1% huab cua poob qis dua 400 degrees Celsius. Ntxiv mus, cov khoom no yog hydrophilic ntau dua polyvinylidene fluoride (PVDF) vim hais tias ntawm cov qauv molecular uas yuav pab tau hydrogen bonding nrog dej molecules. Qhov no, nyob rau hauv lem, ua rau ntau dua ntim ntawm permeate kom tau txais kev siv PES membrane.
Polysulfone tuaj yeem piav qhia tias yog amorphous, pob tshab, thiab daj ntseg amber cov khoom siv thermoplastic uas yog qhov kub thiab txias tshaj plaws thiab cov khoom lag luam muaj cov thermoplastic resin. Tsis tas li ntawd, nws muaj qhov nqus dej ntau dua piv, thiab peb tuaj yeem ua cov kev daws teeb meem ruaj khov los ntawm kev xaiv cov kuab tshuaj tsim nyog.
Qhov txawv ntawm Polysulfone thiab Polyethersulfone yog dab tsi?
Polysulfone yog ib pawg loj ntawm sulfone compounds, thaum polyethersulfone kuj yog ib tug tswv cuab ntawm pab pawg no. Qhov sib txawv tseem ceeb ntawm polysulfone thiab polyethersulfone yog polysulfone yog ib pawg ntawm cov thermoplastic polymers uas muaj xws li rov qab units nrog ib pab pawg neeg sulfone, whereas polyethersulfone yog ib pawg ntawm thermoplastic polymers uas muaj cov subunit aryl-SO2-aryl qauv.
Cov lus hauv qab no qhia txog qhov sib txawv ntawm polysulfone thiab polyethersulfone.
Summary – Polysulfone vs Polyethersulfone
Polysulfone yog tsev neeg ntawm cov thermoplastics ua haujlwm siab, thaum polyethersulfone yog qhov thib ob feem ntau siv cov khoom siv hauv membrane bioreactor (MBR). Qhov sib txawv tseem ceeb ntawm polysulfone thiab polyethersulfone yog polysulfone yog ib pab pawg ntawm cov thermoplastic polymers uas muaj cov rov qab units nrog ib pab pawg neeg sulfone, whereas polyethersulfone yog ib pawg ntawm thermoplastic polymers uas muaj cov subunit aryl-SO2-aryl qauv.
