Qhov sib txawv tseem ceeb ntawm thaiv thiab graft copolymer yog qhov thaiv copolymer muaj cov blocks ntawm rov ua dua tshiab whereas graft copolymer muaj ceg ntawm cov khoom rov ua dua.
A polymer yog ib qho macromolecule uas muaj ntau qhov rov ua dua txuas mus rau ib leeg los ntawm covalent chemical bonds. Thiab, cov chav rov ua dua no sawv cev rau cov monomers uas tau siv hauv cov txheej txheem polymerization los ua cov polymer no. Yog li, muaj ntau yam kev faib tawm rau cov polymers nyob ntawm tus qauv, morphology, cov khoom, thiab lwm yam. Ib copolymer muaj kev sib txawv ntawm monomers dua li lwm cov polymers. Hauv qhov kev npaj no, ntau tshaj ib qho monomers koom nrog hauv kev tsim cov polymer. Thaiv thiab graft copolymer yog ob hom ntawm cov polymers uas tuaj raws li kev faib tawm ntawm cov polymers raws li cov qauv.
Dab tsi yog Block Copolymer?
Ib thaiv copolymer yog copolymer uas tsim thaum ob pawg monomers ua ke thiab tsim 'blocks' ntawm kev rov ua dua. Cov khoom ntawm cov khoom siv polymer no nyob ntawm qhov kev faib tawm ntawm cov ntu ntu, tshuaj lom neeg ntawm cov blocks, qhov hnyav nruab nrab molecular, thiab qhov hnyav molecular faib.
Daim duab 01: Cov qauv ntawm Block Copolymer
Ntau zaus, peb tuaj yeem npaj cov copolymers ntawm qhov sib txuas monomer ntxiv. Nyob ntawd, ob qhov sib txawv monomers tau polymerised nyob rau hauv xws li ib tug monomer polymerizes ua ntej. Tom qab ntawd, tus thib ob monomer txuas mus rau "nyob" polymer saw ntawm thawj monomer. Nyob ntawd, ob lub monomers raug copolymerization thiab tsim ib qho thaiv copolymer.
Piv txwv ntawm cov block copolymer suav nrog SBS roj hmab, ib yam khoom uas peb siv los ua cov log tsheb. Ntxiv mus, lub npe tshuaj ntawm cov khoom no yog acrylonitrile butadiene styrene. Cov blocks hauv SBS roj hmab yog polystyrene thiab polybutadiene. Ntxiv mus, nitrile thiab ethylene-vinyl acetate yog ib co piv txwv rau thaiv copolymer.
Graft Copolymer yog dab tsi?
Graft polymers yog segmented copolymer nrog ib tug linear qaum ntawm ib tug monomer thiab randomly faib ceg ntawm lwm monomer. Ntawm no, sab chains yog structurally txawv los ntawm lub ntsiab saw ntawm lub polymer. Txawm li cas los xij, txawm hais tias lawv yog cov qauv sib txawv ntawm ib leeg, tus kheej grafted chains yuav yog homopolymer lossis copolymer.
Daim duab 02: Cov qauv ntawm Graft Copolymer
Piv txwv li, kev cuam tshuam siab polystyrene yog cov khoom siv copolymer graft. Nws yog vim hais tias cov polymer muaj cov pob txha polystyrene nrog polybutadiene grafted chains. Tsis tas li ntawd, feem ntau ntawm cov graft copolymer muaj txiaj ntsig zoo li cov khoom siv tiv thaiv, thermoplastic elastomers, thiab compatibilizers. Lwm qhov kev siv ntawm graft copolymer yog raws li ib tug emulsifier nyob rau hauv kev npaj ntawm ruaj khov blends los yog alloys.
Qhov txawv ntawm Thaiv thiab Graft Copolymer yog dab tsi?
Polymers yog macromolecules. Raws li hom monomers siv hauv kev tsim cov polymer, muaj ob hom homopolymers thiab copolymer. Ntawm ob, copolymers muaj tsawg kawg yog ob hom monomers hauv lawv cov qauv. Muab piv rau ob, qhov sib txawv tseem ceeb ntawm cov block thiab graft copolymer yog tias ib qho thaiv copolymer muaj cov blocks rov ua dua thaum lub graft copolymer muaj ceg ntawm cov khoom rov ua dua.
Raws li lwm qhov sib txawv tseem ceeb ntawm thaiv thiab graft copolymer, peb tuaj yeem hais tias txoj hauv kev tseem ceeb ntawm kev tsim cov block copolymer yog los ntawm kev sib txuas monomer ntxiv thaum peb tuaj yeem tsim cov khoom cog qoob loo ntawm atom hloov radical polymerization. Tsis tas li ntawd, muaj qhov sib txawv ntawm qhov thaiv thiab graft copolymer hauv txoj kev npaj ib yam nkaus.
Summary – Thaiv vs Graft Copolymer
A copolymer yog cov khoom siv polymer uas muaj ob lossis ntau dua monomers hauv nws cov qauv. Tsis tas li ntawd, muaj ntau hom copolymer xws li thaiv copolymer, graft copolymers, alternating copolymers thiab random copolymer. Txawm li cas los xij, qhov sib txawv tseem ceeb ntawm kev thaiv thiab graft copolymer yog qhov thaiv copolymer muaj cov blocks rov ua dua tshiab thaum lub graft copolymer muaj ceg ntawm cov khoom rov ua dua.
