Qhov sib txawv tseem ceeb ntawm PP thiab tus tsiaj yog tias PP yog cov khoom noj muaj kuab lom, qhov PET yog ib qho tsis muaj polymer.
Lo lus PP sawv cev rau polypropylene thaum PET sawv cev rau polyethylene terephthalate. Cov no yog cov khoom siv polymer ua los ntawm ntau cov monomers. Lub monomer siv los tsim cov khoom siv polymer yog pom tias yog qhov rov ua dua ntawm cov polymer. Rau PP, lub monomer yog propylene. Qhov rov ua dua ntawm PET qhia ethylene terephthalate.
YPP yog dab tsi?
Y Nyob rau hauv cov tshuaj polymer, lo lus PP sawv cev rau polypropylene. Nws yog cov khoom siv polymer uas muaj propylene repeating units. Lwm lub npe rau cov khoom no yog "polypropene". Cov mis mos rau cov polymer no yog [CH(CH
3)CH2n Polypropylene poob hauv qab qeb ntawm thermoplastic polymers, thiab nws muaj kev siv raws li ob qho tib si fibers thiab yas. Cov khoom no ua mos thaum cua sov thiab tuaj yeem hloov mus rau hauv cov duab sib txawv, uas yog cov yam ntxwv ntawm cov thermoplastic polymers. Tsis tas li ntawd, cov khoom siv polymer no yog tsim los ntawm kev ntxiv polymerization. Daim ntawv thov loj ntawm PP yog nws siv los ua cov khoom ntim.
Daim duab 01: Rov ua dua Chav ntawm PP
PP yog pheej yig vim nws yog ib qho ntawm cov khoom siv rov ua dua tshiab. Tsis zoo li hauv nws cov monomer, cov khoom no tsis muaj ob daim ntawv cog lus hauv nws cov qauv polymer; Yog li, nws yog cov khoom siv polymer saturated.
Thaum xav txog qhov kev tawm tsam ntawm PP, muaj peb hom kev tawm tsam uas tuaj yeem pom hauv polypropylene: isotactic, atactic thiab syndiotactic. Isotactic polymer qauv muaj cov saw hlau polymer uas muaj cov pendant pawg ntawm tib sab. Atactic polymer qauv muaj cov saw hlau polymer uas muaj cov pab pawg methyl nyob rau hauv ib qho random. Nyob rau hauv cov qauv syndiotactic, cov methyl pawg nyob rau hauv ib tug alternating qauv.
cov khoom tseem ceeb tshaj plaws ntawm PP suav nrog ntom ntom tsawg, zoo tau hais dua, rov ua dua tshiab, thiab kev ncab. Tsis tas li ntawd, qee qhov kev siv ntawm PP suav nrog kev tsim cov yeeb yaj kiab rau kev ntim khoom noj, kev lag luam textile (rau kev tsim cov ntaub pua plag, thiab lwm yam), kev tsim cov khoom siv, thiab lwm yam.
PET yog dab tsi?
YNyob hauv polymer chemistry, lo lus PET sawv cev rau polyethylene terephthalate. Nws yog cov khoom siv polymer uas muaj cov khoom siv rov ua dua ntawm ethylene terephthalate uas muaj cov tshuaj formula (C
10H8O4.)n Cov khoom no poob rau hauv qeb ntawm thermoplastic resin. PET yog hom polyester.
Daim duab 02: Rov Ua Haujlwm ntawm PET
Feem ntau, PET yog tsim los ntawm ethylene glycol thiab dimethyl terephthalate (los yog terephthalic acid). Nws muaj ob hom tshuaj tiv thaiv hauv cov txheej txheem tsim khoom. Lawv yog cov tshuaj tiv thaiv transesterification thiab cov tshuaj tiv thaiv esterification.
PET yog xim tsis muaj xim, thiab feem ntau, nws nyob hauv lub xeev semi-crystalline. Lub rigidity ntawm cov khoom no nyob ntawm tus txheej txheem ntau lawm. PET muaj zog thiab muaj zog tiv taus. Nws yog qhov zoo tshaj plaws los tiv thaiv cov dej noo thiab roj. Tsis tas li ntawd, nws ua raws li kev tiv thaiv zoo rau cawv thiab qee yam tshuaj. Txawm li cas los xij, nws hloov mus ua xim dawb thaum raug chloroform thiab toluene.
Feem ntau ntawm PET hauv ntiaj teb yog cov khoom siv hluavtaws. Muaj ntau cov ntawv thov tseem ceeb ntawm cov polymer no suav nrog kev tsim cov fwj dej qab zib, tsim cov fibers rau cov khaub ncaws hauv kev lag luam textile, tsim cov ntim khoom noj thiab dej haus cia, ua cov substrate nyob rau hauv nyias zaj duab xis hnub ci hlwb, raws li ib tug waterproofing barrier nyob rau hauv undersea. kab thiab lwm yam.
Qhov txawv ntawm PP thiab tus tsiaj yog dab tsi?
PP stands rau polypropylene thaum PET stands rau polyethylene terephthalate. Qhov sib txawv tseem ceeb ntawm PP thiab PET yog tias PP yog cov khoom siv hluav taws xob zoo, qhov PET yog ib qho tsis muaj polymer. Tsis tas li, PP yog tsim los ntawm kev ntxiv polymerization ntawm propylene thaum PET yog tsim los ntawm condensation polymerization ntawm ethylene glycol thiab dimethyl terephthalate.
Ntxiv mus, daim ntawv thov ntawm PP suav nrog kev tsim cov yeeb yaj kiab rau kev ntim khoom noj, kev lag luam textile (rau kev tsim cov ntaub pua plag, thiab lwm yam), cov khoom siv ntau lawm, thiab lwm yam. Meanwhile, PET tseem ceeb heev rau kev tsim cov fwj dej haus., kev tsim cov fibers rau khaub ncaws hauv kev lag luam textile, tsim cov ntim khoom noj thiab dej haus cia, ua cov substrate nyob rau hauv nyias zaj duab xis hnub ci hlwb, raws li ib tug waterproofing barrier nyob rau hauv undersea cables, thiab lwm yam.
Hauv qab infographic qhia ntau qhov sib piv ntsig txog qhov sib txawv ntawm PP thiab PET.
Summary – PP vs PET
Cov ntsiab lus PP thiab tus tsiaj sawv cev rau polypropylene thiab polyethylene terephthalate, feem. Qhov sib txawv tseem ceeb ntawm PP thiab PET yog tias PP yog cov khoom siv hluav taws xob zoo, qhov PET yog ib qho tsis muaj polymer.
