Qhov sib txawv tseem ceeb ntawm monodisperse thiab polydisperse polymers yog tias monodispersed polymers muaj qhov hnyav thiab tsis sib xws. Tab sis, polydispersed polymers muaj ntau yam ntawm cov khoom nrog ntau qhov hnyav molecular.
Ib qho kev tawg yog ib qho system uas cov khoom ntawm ib theem tau tawg mus thoob plaws hauv nruab nrab uas nyob rau theem sib txawv. Yog li ntawd, ib tug dispersion yog ib tug ob-theem system. Nws yog tsim los ntawm qhov nruab nrab dispersion thiab ib theem dispersed. Qhov nruab nrab dispersion yog qhov nruab nrab txuas ntxiv uas cov theem dispersed tau faib thoob plaws. Dispersed theem, ntawm qhov tod tes, yog theem uas yog tsim los ntawm cov khoom uas raug faib los ntawm lwm theem.
Dab tsi yog Monodisperse Polymers?
Monodisperse polymers yog cov ntaub ntawv macromolecular uas muaj qhov hnyav thiab tsis sib haum xeeb. Qhov ntawd txhais tau tias; tag nrho cov khoom nyob rau hauv cov khoom siv monodispersed polymer muaj tib qhov hnyav molecular. Yog li ntawd, hom khoom siv polymer no zoo ib yam. Cov duab, qhov loj me thiab qhov loj ntawm cov khoom faib tawm hauv ib chav tsev ntim ntawm cov khoom yog zoo ib yam.
Daim duab 01: Kev faib tawm ntawm cov khoom hauv cov khoom siv Monodispersed Polymer
YPolydisperse Polymers yog dab tsi?
Polydisperse polymers yog cov ntaub ntawv macromolecular muaj ntau yam khoom nrog ntau qhov hnyav ntawm molecular. Qhov ntawd txhais tau tias; muaj cov khoom sib txawv uas muaj cov molar sib txawv hauv tib cov khoom siv polymer. Yog li ntawd, cov khoom siv polymer yog non-uniform. Ntxiv rau qhov no, cov duab, qhov loj me thiab qhov loj ntawm cov khoom faib tawm hauv ib chav tsev ntim ntawm cov khoom tsis sib xws.
Daim duab 02: Kev faib tawm ntawm cov khoom hauv cov khoom siv Polydispersed Polymer
Rau hom polydispersed polymers no, peb tuaj yeem suav cov polydispersity Performance index rau molar pawg faib. Qhov sib npaug peb tuaj yeem siv los xam cov polydispersity Performance index lossis PDI yog raws li hauv qab no:
PDI=Mw/Mn
Qhov twg Mw sawv cev rau qhov hnyav nruab nrab molecular hnyav, Mn sawv cev rau tus lej nruab nrab molecular hnyav. Tus lej nruab nrab molecular hnyav (lossis Mn) yog qhov nkag siab zoo rau cov molecules uas muaj qhov hnyav molecular. Qhov hnyav nruab nrab molecular hnyav ntawm Mw yog rhiab heev rau cov molecules uas muaj molecular loj.
Qhov txawv ntawm Monodisperse thiab Polydisperse Polymers yog dab tsi?
Polymers yog macromolecules tsim los ntawm polymerization ntawm monomers. Dispersity ntawm ib tug polymer yog tham txog qhov hnyav molecular ntawm lub polymer. Qhov sib txawv tseem ceeb ntawm monodisperse thiab polydisperse polymers yog tias monodispersed polymers muaj qhov hnyav thiab tsis sib xws, thaum polydispersed polymers muaj ntau yam khoom nrog ntau qhov hnyav molecular.
Ntxiv mus, monodisperse polymers muaj cov duab zoo ib yam, qhov loj me thiab kev faib tawm ntau, thaum polydisperse polymers muaj qhov tsis sib xws, qhov loj me thiab kev faib tawm ntau. Yog li ntawd, monodisperse polymers yog uniform, thaum polydisperse polymers tsis yog-uniform.
Cov lus hauv qab no qhia txog qhov sib txawv ntawm monodisperse thiab polydisperse polymers.
Summary – Monodisperse vs Polydisperse Polymers
Raws li kev sib cais, muaj ob hom polymers li monodisperse polymers thiab polydisperse polymers. Monodisperse polymers yog cov ntaub ntawv macromolecular uas muaj qhov hnyav thiab tsis sib haum xeeb thaum lub sijhawm polydisperse polymers yog cov khoom siv macromolecular uas muaj ntau yam khoom nrog ntau qhov hnyav molecular. Yog li ntawd, qhov sib txawv tseem ceeb ntawm monodisperse thiab polydisperse polymers yog tias monodispersed polymers muaj qhov hnyav thiab qhov tsis sib xws, thaum polydispersed polymers muaj ntau yam khoom nrog ntau qhov hnyav molecular..
