Kev Ua Kom Muaj Polymerization: Cov Txheej Txheem, Cov Txheej Txheem, thiab Cov Ntawv Thov
Kev ua kom polymerization yog ib qho txheej txheem tshuaj lom neeg uas cov monomers sib cuam tshuam los tsim cov saw polymer ntev. Muaj ob hom polymerization tseem ceeb: kev ntxiv polymerization thiab kev sib xyaw ua ke polymerization. Tsab xov xwm no yuav tshawb nrhiav kev sib xyaw ua ke polymerization kom tob - los ntawm nws cov lus txhais thiab cov txheej txheem mus rau nws cov ntawv thov thiab cov txiaj ntsig.
Kev Txhais Lus ntawm Condensation Polymerization
Kev sib xyaw ua ke ntawm cov polymerization yog ib hom polymerization uas cov monomers sib xyaw ua ke los ntawm kev tshuaj lom neeg uas tsim cov khoom seem, xws li dej, cawv, lossis ammonia. Qhov kev sib xyaw no feem ntau tshwm sim ntawm ob pawg sib txawv ntawm cov monomers, xws li carboxylic acid nrog cawv (ua ib qho ester) lossis carboxylic acid nrog amine (ua ib qho amide).
Kev Ua Kom Muaj Polymerization Mechanism
Hauv kev sib xyaw ua ke ntawm cov polymerization, ib lub monomer yuav tsum muaj tsawg kawg yog ob qhov chaw ua haujlwm. Txhua lub monomer ua haujlwm nrog lwm lub monomer los ntawm txoj kev loj hlob kauj ruam, qhov twg cov tshuaj ua haujlwm tshwm sim ntawm cov khub ntawm cov monomers los tsim cov dimers, trimers, thiab thaum kawg polymers.
Qee cov kauj ruam yooj yim hauv cov txheej txheem polymerization condensation yog:
1. Kev Pib thiab Kev Tsim Dimer:
Tus thawj monomer yuav ua rau muaj kev cuam tshuam nrog tus thib ob monomer los tsim ib lub dimer thiab ib lub molecule condensation me me, xws li dej.
\[
\text{A-Hnub Monday + B-Hnub Monday} \rightarrow \text{AB-Dimer} + \text{H}_2\text{O}
\]
2. Kev Tsim Oligomer:
Cov dimers tsim tau tuaj yeem cuam tshuam ntxiv nrog lwm cov monomers lossis nrog lwm cov dimers los tsim cov oligomers ntev dua.
\[
\text{AB-Dimer + A-Mon} \rightarrow \text{ABA-Mon} + \text{H}_2\text{O}
\]
3. Kev Tsim Polymer:
Cov oligomers raug cov tshuaj tiv thaiv condensation kom txog thaum lawv tsim cov polymers ntev. Cov txheej txheem no tuaj yeem txuas ntxiv mus txog thaum ncav cuag cov polymers hnyav molecular.
\[
\text{ABABAB} \rightarrow \text{Polymer} + \text{H}_2\text{O}
\]
Piv txwv ntawm Cov Tshuaj Tiv Thaiv Polymerization Condensation
Qee cov tshuaj tiv thaiv zoo hauv kev sib xyaw ua ke polymerization suav nrog:
1. Kev Tsim Polyester:
Cov polyesters yog tsim los ntawm kev sib xyaw ntawm dicarboxylic acids thiab diols, tsim dej ua cov khoom lag luam.
\[
n\ \text{HO-CH}_2 \text{-CH}_2 \text{-OH} + n\ \text{HOOC-Ph-COOH} \rightarrow \text{(-O-CH}_2 \text{-CH}_2 \text{-OCO-Ph-CO-)n} + 2n\ \text{H}_2\text{O}
\]
2. Kev tsim cov Polyamide (Nylon):
Nylon yog tsim los ntawm kev sib xyaw ntawm hexamethylenediamine thiab adipic acid los tsim dej.
\[
n\text{H}_2 \text{N-(CH}_2\text{)}_6 \text{-NH}_2 + n \text{HOOC-(CH}_2\text{)}_4\text{-COOH} \rightarrow \text{(-NH-(CH}_2\text{)}_6 \text{-NH-CO-(CH}_2\text{)} \text{H}_2\text{O}
\]
Cov Khoom thiab Cov Yam Ntxwv ntawm Cov Polymers Tsim Tawm
Cov polymers tsim los ntawm kev sib xyaw ua ke muaj ntau yam khoom sib txawv nyob ntawm cov monomers siv thiab cov xwm txheej ntawm kev ua haujlwm:
1. Lub zog kho tshuab:
Cov polymers xws li nylons thiab polyesters muaj lub zog kho tshuab loj, ua rau lawv zoo rau cov ntawv thov uas xav tau cov ntaub ntawv muaj zog thiab ruaj khov.
2. Lub Cim Yaj:
Cov khoom siv thermal ntawm cov condensation polymers nyob ntawm lawv cov qauv tshuaj lom neeg. Ntau ntawm cov polymers no muaj cov ntsiab lus melting siab, ua rau lawv siv tau rau hauv qhov kub thiab txias heev.
3. Tiv taus cov tshuaj lom neeg:
Qee cov polymers condensation ua rau muaj kev tiv thaiv tshuaj lom neeg zoo, ua rau lawv yog cov kev xaiv zoo tshaj plaws rau qee yam kev siv hauv kev lag luam.
Cov Ntawv Thov Polymer Condensation
Cov polymers condensation muaj ntau yam kev siv hauv lub neej txhua hnub thiab kev lag luam. Qee qhov kev siv feem ntau suav nrog:
1. Cov ntaub:
Cov xov polyester (xws li Dacron) thiab nylon feem ntau siv rau hauv kev tsim khaub ncaws, ntaub pua plag, thiab lwm yam khoom siv textile vim lawv ruaj khov thiab yooj yim saib xyuas.
2. Ntim:
Cov fwj PET (polyethylene terephthalate) siv rau dej haus thiab dej qab zib yog ib qho piv txwv ntawm kev siv polyester hauv kev ntim khoom.
3. Cov Khoom Siv Engineering:
Nylon thiab polyurethane feem ntau siv rau hauv kev tsim cov khoom uas xav tau kev ruaj khov siab, xws li cov iav, cov kabmob, thiab lwm yam khoom siv kho tshuab.
4. Tsheb:
Ntau yam khoom siv hauv tsheb yog ua los ntawm cov polymers condensation, suav nrog cov khoom sab hauv tsheb thiab cov khoom siv cav uas xav tau kev tiv taus cua sov thiab tshuaj lom neeg.
Lub Zog thiab Qhov Tsis Muaj Zog
Zoo li txhua yam txheej txheem tshuaj lom neeg, kev sib xyaw ua ke polymerization muaj qhov zoo thiab qhov tsis zoo uas yuav tsum tau xav txog.
Kev Zoo Tshaj Plaws:
1. Kev siv tau ntau yam:
Cov polymers condensation tuaj yeem tsim los ntawm ntau yam monomers, tso cai rau kev hloov kho cov khoom kom haum rau daim ntawv thov xav tau.
2. Lub zog thiab kev ua siab ntev:
Cov polymers condensation feem ntau muaj lub zog zoo thiab tiv taus cov xwm txheej ib puag ncig hnyav.
3. Cov Txheej Txheem Tsim Khoom Tsim:
Cov txheej txheem polymerization condensation tau siv ntev hauv kev lag luam, yog li cov txheej txheem thiab cov khoom siv uas xav tau yog qhov paub tab thiab yooj yim nkag mus tau.
Qhov Tsis Muaj Zog:
1. Kev Tsim Cov Khoom Siv Sab:
Cov tshuaj tiv thaiv condensation tsim cov molecule me me ua cov khoom seem uas yuav tsum tau tswj hwm, piv txwv li dej uas yuav tsum tau tshem tawm ntawm cov tshuaj tiv thaiv.
2. Kev Tswj Qhov Hnyav Molecular:
Kev tswj qhov hnyav molecular kawg feem ntau nyuaj dua li nrog kev ntxiv polymerization, uas xav tau kev tswj hwm cov tshuaj tiv thaiv nruj dua.
Yav Tom Ntej ntawm Kev Ua Kom Muaj Polymerization
Kev sib xyaw ua ke ntawm cov polymerization tseem yog ib qho chaw tshawb fawb tseem ceeb, ob qho tib si hauv kev kawm thiab kev lag luam. Qee qhov kev taw qhia kev loj hlob yav tom ntej suav nrog:
1. Cov Monomers Uas Siv Biomass:
Txo kev vam khom rau cov khoom siv roj av los ntawm kev siv cov monomers uas tau los ntawm cov peev txheej rov ua dua tshiab.
2. Lub Tshuab Catalysis Zoo Dua:
Tsim cov catalysts xaiv tau zoo dua thiab ua haujlwm tau zoo dua los txo cov khoom seem thiab ua kom cov tshuaj tiv thaiv ua haujlwm tau zoo dua.
3. Cov ntaub ntawv uas muaj cov khoom tshwj xeeb:
Tsim cov polymers nrog cov khoom tshwj xeeb xws li kev ua hluav taws xob, kev puas tsuaj ntawm cov nroj tsuag, thiab kev teb rau cov teeb meem sab nraud xws li lub teeb lossis pH.
Nrog ntau yam kev siv tau thiab cov lus qhia txhim kho, condensation polymerization tseem yog ib qho thev naus laus zis tseem ceeb hauv ntiaj teb cov khoom siv niaj hnub no.
