Qhov sib txawv tseem ceeb ntawm branched thiab crosslinked polymers yog tias branched polymer molecules muaj sab chains uas txuas rau lub caj qaum ntawm polymer, whereas crosslinked polymer cov ntaub ntawv muaj kev sib txuas ntawm cov loj polymer molecules.
Polymers yog macromolecules uas muaj cov lej ntau dua. Cov chav rov ua dua no sawv cev rau cov monomers uas tau siv los ua cov khoom siv polymer. Muaj covalent tshuaj bonds ntawm monomers.
Npaj Polymers yog dab tsi?
Branched polymers yog macromolecules tsim los ntawm polymerization ntawm monomers thiab muaj cov qauv ceg. Kev faib tawm ntawm cov ntaub ntawv polymer no tshwm sim los ntawm kev hloov qee cov atoms los ntawm cov saw hlau polymer nrog cov khoom hloov. Cov khoom ntawm cov polymers no feem ntau cuam tshuam los ntawm cov degree ntawm branching. Cov pab pawg hloov pauv kuj yog cov saw hlau polymer tsim los ntawm cov khoom sib txuas sib txuas monomer, thiab cov saw hlau sab no tuaj yeem yog cov saw luv lossis cov saw ntev. Muaj ntau hom kev sib txawv ntawm cov polymers xws li graft polymer thiab comb polymer.
Daim duab 01: Ntau hom ntawm cov ceg ntoo ntawm cov khoom sib txawv
Graft Polymer: Cov no yog cov ceg ntoo polymers uas muaj cov hlua sab nraud uas muaj cov monomers sib txawv rau ntawm cov saw tseem ceeb. Nyob rau hauv lwm yam lus, nws yog ib tug segmented copolymer muaj li ntawm ib tug linear caj qaum hloov nrog ceg ntawm ib tug polymer ntawm ib tug txawv hom.
Y Comb Polymer: Cov no yog cov polymers uas muaj comb macromolecules. Qhov no txhais tau hais tias cov polymers no muaj cov hlua khi ntawm tib sab ntawm lub nraub qaum, thiab cov polymer zoo li lub zuag.
Crosslinked Polymers yog dab tsi?
YCrosslinked polymers yog macromolecules uas muaj kev sib txuas ntawm cov khoom siv polymer. Ib qho crosslink yog covalent daim ntawv cog lus ntawm ob lub polymer chains uas tuaj yeem yog ionic bonds lossis covalent bonds. Cov crosslinks no tsim thaum lub sij hawm txheej txheem ntawm polymerization los yog tom qab ua tiav ntawm polymerization.
Daim duab 02: Tsim cov Sulfur Crosslinks
Vim tias crosslinks ntawm cov saw hlau polymer muaj zog dua li cov khoom siv sib txuas hauv nruab nrab, cov khoom siv polymer tsim los ntawm crosslinking yog ruaj khov thiab muaj zog dua. Cov polymers no tshwm sim nyob rau hauv ob qho tib si hluavtaws cov ntaub ntawv thiab raws li ib txwm tshwm sim polymers. Crosslinks yog tsim los ntawm cov tshuaj tiv thaiv nyob rau hauv lub xub ntiag ntawm crosslinking reagents. Feem ntau piv txwv ntawm crosslinked polymers yog vulcanized roj hmab. Txij li cov roj hmab ntuj tsis nruj lossis nruj txaus, cov roj hmab yog vulcanized. Nyob ntawd, roj hmab yog rhuab nrog leej faj, yog li cov sulfur molecules tsim covalent bonds nyob rau hauv cov roj hmab polymer chains, txuas cov chains nrog ib leeg. Tom qab ntawd cov roj hmab los ua cov khoom tawv thiab tawv uas yog ruaj khov.
Tus nqi ntawm crosslinking muab qib ntawm crosslinking ib mole ntawm cov khoom. Peb tuaj yeem ntsuas qhov degree ntawm crosslinking los ntawm kev sim o. Hauv qhov kev sim no, cov khoom raug muab tso rau hauv ib lub thawv nrog cov kuab tshuaj haum. Tom qab ntawd qhov kev hloov ntawm huab hwm coj lossis qhov hloov ntawm qhov ntim yog ntsuas. Ntawm no, yog tias qhov degree ntawm crosslinking tsawg, cov khoom swells ntau dua.
Qhov txawv ntawm Branched thiab Crosslinked Polymers yog dab tsi?
Qhov sib txawv tseem ceeb ntawm branched thiab crosslinked polymers yog tias branched polymer molecules muaj sab chains uas txuas mus rau lub caj qaum ntawm polymer, hos crosslinked polymer cov ntaub ntawv muaj kev sib txuas ntawm cov loj polymer molecules. Tsis tas li ntawd, branched polymers yog qhov nyuaj dua li crosslinked polymers.
Hauv qab no yog ib daim ntawv qhia ntawm qhov sib txawv ntawm cov ceg ntoo thiab cov kab sib txuas sib txuas.
Summary – Branched vs Crosslinked Polymers
Branched thiab crosslinked polymers yog cov ntaub ntawv macromolecular. Qhov sib txawv tseem ceeb ntawm branched thiab crosslinked polymers yog tias branched polymer molecules muaj sab chains uas txuas mus rau lub caj qaum ntawm polymer, hos crosslinked polymer cov ntaub ntawv muaj kev sib txuas ntawm cov loj polymer molecules.
