Kev Tshawb Pom Kev Txhim Kho Cov Graphene / Epoxy Resin Composite Coatings (2)

2. Cov teeb meem uas muaj nyob

Vim tias graphene muaj ntau qhov chaw deg (ib qho theoretical value of 2630 m2 / g) thiab lub siab zog, agglomerates thiab tangles tshwm sim thaum tus nqi ntawm graphene loj loj, ua rau tsis plam dispersion thiab stability hauv matrix. . Rau cov thermal thiab hluav taws xob cov khoom, thaum ib tus nqi tsawg dua ntawm graphene ntxiv, qhov yuav qhib tau rau ntawm qhov chaw pib, thiab cov ntsiab lus ntawm graphene ntxiv tau ntxiv, thiab qhov ntau ntawm kev txhim kho ntxiv hauv cov cua kub thiab cov hluav taws xob conductivity me dua. Txawm li cas los xij, kev kho khoom thiab mechanical zog, cov khoom ua kom los tiv thaiv corrosion, txawm tias tsawg tus nqi ntawm graphene tuaj yeem txhim kho kev ua tau zoo, vim nws cov agglomeration hauv epoxy txheej ntawm ib qhov nyiaj, nws yuav ua rau cov kab nrawm, kev nyuab siab concentration thiab cov teeb meem hauv cov txheej. Ua rau ib tug poob rau hauv kev ua tau zoo.

Wu Fang ntsuas cov txhuam coefficient hauv kev sib txhuam qhuav thiab seawater txhuam sib txawv ntawm G / EP coatings nrog lub ntsuas kev sib tsoo thiab pom tau tias thaum G yog 1% (feem ntau pawg), kev sib txhuam coefficient thiab hnav tus nqi ntawm lub txheej yuav nce. Thiab taw tes tias qhov no yog vim muaj cov ntsiab lus G heev dhau lawm, nws yuav tshwm sim hauv lub coating los ntawm cov agglomeration ntawm kab nrib pleb, ua rau txheej yog ib qho yooj yim rau tev tawm hauv kev sib txuam kev sib txuam, qhov tshwm sim hnav ris tsho ntau ntxiv cov txheej txhawm kev txhuam coefficient thiab hnav npaum li cas.

Zhi li al. siv ultrasonic dispersion tshuab los npaj lub G / EP Composition txheej, thiab ua rau peb theem pib tho kev kuaj tom qab qhov txheej twb kho, thiab tom qab ntawd pom lub pob zeb tawg ntawm lub txheej uas siv ib daim teb emission scanning electron microscope (FE-ESM). Nws pom tau tias thaum cov ntsiab lus ntawm graphene yog 1% (feem ntau pawg), cov dispersion nyob rau hauv txheej yog tib yam, thiab thaum cov ntsiab lus tsawg tshaj li 1%, lub toughness ntawm lub txheej loj nce. Txawm li cas los xij, thaum lub ntsiab lus 2%, agglomeration yuav tshwm sim hauv cov txheej, uas yuav ua rau muaj teeb meem rau cov ntsiab lus ntawm kev nyuab siab, uas ua rau txo qis dua ntawm cov txheej txheem.

Liu li al. thov G li corrosion inhibitor mus rau epoxy resin E44 system los npaj lub G / EP composite lo, thiab ntsuas cov potentiodynamic polarization nkawm tom qab koj tso rau hauv 3.5% NaCl tov rau 48 teev.

Cov kev tshwm sim qhia tau tias nws tus kheej corrosion ntawm 0.5% (feem ntau pawg feem ntau) G / E44 thiab 1% (feem loj me) G / E44 txheej yog ho qis tshaj li ntawm E44 txheej, thiab qhov corrosion tam sim no ntawm 0.5% G / E44 (0.0551μA / cm2)) ntau dua li 1% G / E44 (0.934μA / cm2) thiab E44 (0.121μA / cm2) coatings, qhia tias qhov sib ntxiv ntawm graphene pab kho qhov dej-cov tshuaj tiv thaiv ntawm epoxy coatings thiab txo cov nkag mus ntawm corrosive xov xwm. . Txawm li cas los, ntxiv cov graphene tshaj yuav agglomeration rau ntawm lub txheej thiab txo cov tshuaj tiv thaiv dej ntawm cov txheej.

3. Tshawb fawb txog kev ua haujlwm graphene / epoxy coatings

3.1 Functionalized graphene

Vim yog lub cev tsis muaj zog thiab cov neeg ua haujlwm ntawm lub cev loj ntawm π-bonded nyob rau ntawm qhov sib txawv ntawm graphene intrinsic, nws yog ib qho yooj yim rau teeb thiab aggregate hauv epoxy txheej, thiab nws yog qhov yooj yim rau lub graphene kom siab rau nws cov kev ua tau zoo hauv cov thawv epoxy. Yuav kom daws tau qhov teeb meem no, cov neeg txawv teb chaws thiab cov neeg txawv teb chaws tau tsim dua ib qho tshiab ntawm kev ua haujlwm zoo los ntawm kev ntxiv lwm yam thiab cov qauv ntawm lub hauv paus ntawm graphene. Cov graphene no, thaum tswj nws cov khoom yooj yim, nws kuj yuav pub ib qho cuab yeej tshiab, thiab tseem tuaj yeem txhawm rau optimize graphene raws li qhov yuav tsum tau ua kom cov khoom ntim.

Raws li cov qauv tshuaj, lub functionalization ntawm graphene yog muab faib rau cov tsev cog hniav thiab cov khoom tsis yog covalent. Cov khoom sib txuas ua kom lub tsev txav los ntawm lub graphene qhov chaw, ua kom nws muaj zog. Txawm li cas los xij, kev puas tsuaj ntawm txoj kev ruaj khov no yuav ua rau muaj kev txo zog hauv cov hluav taws xob thiab thermal conductivity ntawm cov functionalized graphene dua li graphinsic graphene. Non-covalent bonding yog hais txog kev siv ntawm cov xeeb ceem ntawm super-loj meej deg thaj tsam ntawm graphene, uas yog compounded nrog rau lwm cov ntsiab lus nrog cov khoom zoo heev los ntawm adsorption deg. Txawm hais tias hom no tsis rhuav tshem cov qauv ntawm cov graphene, thiab tuav cov qauv kev ua haujlwm ntawm lub graphene, qhov kev tawm ntawm cov dispersion yog ib nyuag tsis zoo dua rau cov tsev cog lus. Feem ntau, nws yog ib qho tsim nyog ntxiv rau stabilizer los yog ultrasonic dispersion.

Txawm hais tias kev tshawb fawb ntawm cov functionalized graphene tseem nyob hauv theem pib, muaj ob peb cov kev tshawb fawb ntawm nws daim ntawv thov nyob rau hauv epoxy resin los tiv thaiv corrosion coatings. Txawm li cas los xij, qee cov kws tshawb fawb tau muab kho qhov chaw ntawm graphene los ntawm tej pawg neeg ua haujlwm thiab ntxiv cov tshuaj epoxy, thiab ua pov thawj tias cov graphene functionalized yog superior rau graphene ntshiab.

3.2 Daim ntawv thov ntawm cov Graphene Functionalized hauv Epoxy Coatings

Ghaleb li al. ntsuam xyuas lub iav hloov kub Tg ntawm G / EP coatings thiab ch-G / EP (chloroform-functionalized graphene / epoxy resin) coatings los ntawm kev sib txawv scanning calorimetry. Nws tau pom tias G / EP tsuas muaj graphene. Tus Tg ntawm lub ntim ntawm 0.1% yog siab tshaj qhov ntshiab ntawm EP, thaum tag nrho cov kev kuaj hauv ch-G / EP yog siab tshaj Tg cov ntshiab EP. Qhov no yog vim qhov graphene ntshiab yuav tsim cov agglomerates hauv cov txheej thaum nws ntxiv rau ib qho nqi, uas cuam tshuam kev ua haujlwm, thiab graphene functionalized nrog cov chloroform tuaj yeem muab pov rau hauv cov txheej.

Cov tshuaj txo ntawm Au3 + los ntawm Martin-GALLEGO thiab lwm tus. functionally hloov lub nto ntawm graphene nrog kub nanoparticles generated los ntawm autodeposition rau ntawm qhov kub particle, thiab dispersed cov Au / G nyob rau hauv lub teeb kho kho epoxy txheej ntawm ultrasonic dispersion. nyob rau hauv. Nws tau pom tias qhov hluav taws xob ntawm Au-G / EP yog li 4 xaj ntawm qhov siab tshaj qhov siab ntawm G / EP ntawm tib qhov ntxiv. Chen Yu siv hydrothermal txujci, siv resol phenolic resin thiab graphene oxide ua raw li cov ntaub ntawv, npaj tau hloov phenolic resin hloov graphene airgel (p-GA), thiab siv nws ua cov ntaub ntawv tsim hluav taws xob los tsim cov khoom sib xyaw nrog EP. Txoj kev tshawb no pom tau tias: vim yog qhov sib ntxiv ntawm resol phenolic resin kom ua rau cov qauv hauv P-GA zoo dua qub dua, ib qho me me ntawm cov p-GA tuaj yeem tau txais kev coj ua zoo thiab electromagnetic shielding kev ua tau zoo. Thaum cov ntsiab lus muab tub lim nyhiab yog 0.33% (feem ntau pawg), cov hluav taws xob hluav taws xob yog 73 S / m, thiab qhov kev ua tiav electromagnetic shielding ncav 35 dB.

Qi li al grafted silane nyob rau ntawm qhov graphene oxide kom tau silane-functionalized graphene (g-GO) thiab ntxiv mus rau epoxy matrix nrog kua Crystal epoxy (LCE) ua ib cov neeg muab khoom ua ke kom npaj ib qho epoxy rechin txheej. . Txoj kev tshawb no qhia tau tias thaum cov kua txhij sib txuam yog 3% [2% (feem ntau cov lej) g-GO thiab 1% LCE], piv nrog cov ntshiab epoxy txheej, qhov feem xyuam ntawm qhov txheej txheem qhov nce ntawm 132.6%, thiab lub zog tensile Thiab khoov qis zog tau nce los ntawm 27.6% thiab 37.5%, feem. Kev ua tau zoo ntawm cov duab tsis xwm yeem tau raug ntxiv lawm.

Ramezanzadeh li al. hloov graphene oxide los ntawm gel-raws li silane, npaj silane functionalized graphene oxide / epoxy resin txheej, thiab kawm silane functionalized graphene oxide los ntawm electrochemical impedance spectroscopy, ntsev tsuag tshuaj thiab kev kuaj cathodic disbondment. Cov nyhuv ntawm cov xim muaj xim. Cov txiaj ntsig tau qhia tias cov silicone-hloov tau graphene oxide yog sib xyaw ua kom haum nyob rau hauv cov epoxy matrix, thiab qhov corrosion ntawm lub txheej twb zoo tuaj lawm thiab cov cathodic disbondment tau txo.

Txawm hais tias txoj kev tshawb no cov kev ua hauj lwm graphene epoxy resin coatings tau ua ntau hom kev ua tau zoo, vim tias cov tshuaj tiv thaiv tsis yooj yim rau kev tswj, kev tsim cov ntawv tsim ntawm cov txheej coatings yog tsis txaus, thiab nws tsis haum rau cov khoom loj. Nws yog ib qho tseem ceeb uas yuav tau nrhiav kev yooj yim thiab kev npaj txhij.

4. Outlook

Nrog rau kev nthuav dav ntawm kev tshawb fawb thiab kev siv technology, niaj hnub nim no cov neeg xav ua qhov kev ua tau zoo ntawm cov txheej txheem epoxy-raws li coatings. Txawm li cas los xij, vim qhov tseeb tias cov cuab yeej siv rau kev npaj graphene / epoxy resin composite coatings tseem tsis tau paub tab, nws yuav tsum tau tsim nyob rau hauv cov cheeb tsam nram qab no. txoj kev tshawb no.

(1) Nws tsis yog txuam nrog rau qhov kev kawm ntawm graphene / epoxy coatings. Kev hloov kev hloov ntawm graphene yuav tsum tau muab coj los txhim kho rau cov kev kawm tshwj xeeb los yog yuav tsum ua kom cov neeg ua haujlwm zoo tshaj plaws yuav tsum tau siv los txhim kho ib qho cuab yeej ntawm tus txheej txheem.

(2) Cov ntsiab lus thiab hom kev oxygen uas muaj kev ua haujlwm hauv cov graphene yog lub hauv paus rau kev xaiv cov kev hloov kho cov qauv thiab cov kev hloov kho. Macro-kev npaj ntawm graphene functionalized nrog cov qauv sib luag thiab cov khoom yuav tsum yog qhov tseem ceeb ntawm cov kev tshawb fawb yav tom ntej.

(3) Nrog kev txhim kho ntawm kev tiv thaiv kev tiv thaiv ib puag ncig, txheej txheem dej-raws li corrosion coatings yog accelerating. Water-based graphene epoxy coatings muaj dav zeem muag. Qhov teeb meem yuav tsum tau daws yog cov dispersion ntawm graphene hauv aqueous epoxy resins thiab cov guarantee kev zoo conductive thiab thermal conductivity ntawm cov coatings.

(4) Kev ntsuas kev ua haujlwm thiab kev siv cov graphene thiab cov txheej txheem epoxy functionalized yuav tsum tau kawm ntxiv. Raws li kev qhuab ntuas, cov txheej txheem graphene raws li txheej txheem koom nrog ntau qhov chaw, xws li nplaim hluav taws xob thiab ua haujlwm ntawm cov txheej txheem graphene raws li epoxy coatings. Kev txuas ntxiv, thiab lwm yam, yuav tsum tau kawm ntxiv thiab tshawb nrhiav los ntawm cov kws tshawb fawb.

(5) Teeb meem kev tswj thiab kev ua tau zoo ntawm cov functionalized functional pawg nyob rau saum npoo graphene, thiab zoo li xaiv cov chaw hauv cov graphene qhov chaw, thiab tsim cov graphene / epoxy resin rau kev ua kom pom kev ua chemical kom haum rau kev sib txawv ntawm kev siv cov xim thom khwm yuav tsum kawm ntxiv.