High thermal conductivity plastics qhia cov txuj ci txawv tshaj plaw hauv transformer inductors, hluav taws xob tiv thaiv hluav taws xob hluav taws xob, cov khoom siv hluav taws xob tshwj xeeb, cov ntim hluav taws xob, thermal potting thiab lwm yam kev lag luam rau lawv cov kev ua tau zoo, tsis tshua muaj nqi thiab zoo thermal conductivity.Siab thermal conductivity nrog graphene raws li clickene raws li qhov yuav tsum tau ua kom tau raws li qhov ua kom muaj kev lag luam kub thiab kev lag luam hluav taws xob.

Cov pa thermal conductive plastics feem ntau yog ua los ntawm cov khoom siv hluav taws xob ua hluav taws xob los yog cov khoom siv inorganic kom sib npaug ntawm cov ntaub ntawv polymer matrix.Thaum tus nqi ntawm cov muab tub lim mus txog rau ib theem, cov muab tub lim tsim ib cov saw zoo li thiab network-zoo li morphology nyob rau hauv lub system, uas yog, ib tug thermally conductive network saw.Thaum cov kev taw qhia kev taw qhia ntawm cov cua sov conductive mesh chains yog sib npaug rau cov kev taw qhia ntawm cov cua sov, cov thermal conductivity ntawm lub cev tau zoo heev.

High thermal conductive plastics nrogcarbon nanomaterial grapheneraws li muab tub lim tuaj yeem ua tau raws li qhov yuav tsum tau muaj ntawm qhov siab ceev thiab siab sib koom ua ke kev txhim kho hauv kev tswj xyuas thermal thiab kev lag luam hluav taws xob.Piv txwv li, thermal conductivity ntawm ntshiab polyamide 6 (PA6) yog 0.338 W / (m · K), thaum muaj 50% alumina, thermal conductivity ntawm cov composite yog 1.57 npaug ntawm cov ntshiab PA6;Thaum ntxiv 25% cov hloov kho zinc oxide, thermal conductivity ntawm cov khoom sib xyaw yog peb zaug siab dua li ntawm cov ntshiab PA6.Thaum 20% graphene nanosheet ntxiv, thermal conductivity ntawm cov khoom sib xyaw nce mus txog 4.11 W / (m•K), uas tau nce ntau dua 15 npaug tshaj li PA6 ntshiab, uas qhia tau tias muaj peev xwm loj heev ntawm graphene hauv kev tswj xyuas thermal.

1. Kev npaj thiab thermal conductivity ntawm graphene/polymer composites

Lub thermal conductivity ntawm graphene/polymer composites yog inseparable los ntawm kev ua tej yam kev mob nyob rau hauv cov txheej txheem npaj.Cov txheej txheem kev npaj sib txawv ua rau muaj qhov sib txawv ntawm qhov sib txawv, kev ua haujlwm ntawm lub ntsej muag thiab cov qauv spatial ntawm cov muab tub lim hauv matrix, thiab cov xwm txheej no txiav txim siab qhov tawv, lub zog, toughness thiab ductility ntawm cov khoom sib xyaw.Raws li qhov kev tshawb fawb tam sim no muaj kev txhawj xeeb, rau cov graphene/polymer composites, cov degree ntawm dispersion ntawm graphene thiab cov degree ntawm peeling ntawm graphene nplooj ntawv yuav tswj tau los ntawm kev tswj shear, kub thiab polar solvents.

2. Cov yam tseem ceeb cuam tshuam txog kev ua haujlwm ntawm graphene muaj cov khoom siv thermal conductivity siab

2.1 Ntxiv tus nqi ntawm Graphene

Nyob rau hauv lub siab thermal conductivity yas ntim nrog graphene, raws li tus nqi ntawm graphene nce, thermal conductive network saw yog maj tsim nyob rau hauv lub system, uas zoo heev txhim kho cov thermal conductivity ntawm cov khoom sib xyaw.

Los ntawm kev kawm cov thermal conductivity ntawm epoxy resin (EP)-raws li graphene composites, nws tau pom tias qhov sib piv ntawm graphene (txog 4 txheej) tuaj yeem ua kom cov thermal conductivity ntawm EP los ntawm 30 npaug rau 6.44.W / (m•K), thaum cov txheej txheem thermal conductive fillers xav tau 70% (ntim feem) ntawm cov muab tub lim kom ua tiav cov txiaj ntsig no.

2.2 Tus naj npawb ntawm cov khaubncaws sab nraud povtseg ntawm Graphene
Rau multilayers graphene, txoj kev tshawb no ntawm 1-10 txheej ntawm graphene pom tau hais tias thaum tus naj npawb ntawm graphene txheej tau nce los ntawm 2 mus rau 4, lub thermal conductivity poob ntawm 2 800 W / (m•K) mus rau 1300 W / (m•K). ).Nws ua raws li cov thermal conductivity ntawm graphene zoo li txo qis nrog qhov nce ntawm cov txheej txheem.

Qhov no yog vim lub multilayer graphene yuav agglomerate nrog lub sij hawm, uas yuav ua rau lub thermal conductivity txo.Nyob rau tib lub sijhawm, qhov tsis xws luag hauv graphene thiab kev tsis sib haum xeeb ntawm ntug yuav txo cov thermal conductivity ntawm graphene.

2.3 Hom substrate
Cov khoom tseem ceeb ntawm cov khoom siv hluav taws xob siab thermal muaj xws li cov ntaub ntawv matrix thiab fillers.Graphene yog qhov kev xaiv zoo tshaj plaws rau fillers vim nws cov thermal conductivity zoo heev.Different matrix compositions cuam tshuam rau thermal conductivity.Polyamide (PA) muaj cov khoom siv zoo, tiv thaiv tshav kub, hnav tsis kam, tsis tshua muaj kev sib txhuam coefficient, qee cov nplaim taws retardancy, ua haujlwm yooj yim, haum rau kev hloov kho, txhim kho nws cov kev ua tau zoo thiab nthuav dav daim ntawv thov.

Txoj kev tshawb nrhiav pom tias thaum lub ntim feem ntawm graphene yog 5%, lub thermal conductivity ntawm cov khoom sib xyaw yog 4 npaug siab dua li ntawm cov polymer zoo tib yam, thiab thaum lub ntim feem ntawm graphene nce mus txog 40%, thermal conductivity ntawm cov khoom sib xyaw. yog nce 20 npaug..

2.4 Kev npaj thiab faib cov graphene hauv matrix
Nws tau raug pom tias qhov taw qhia ntsug stacking ntawm graphene tuaj yeem txhim kho nws cov thermal conductivity.
Tsis tas li ntawd, kev faib ntawm cov muab tub lim hauv matrix kuj cuam tshuam rau thermal conductivity ntawm cov khoom sib xyaw.Thaum lub muab tub lim yog uniformly dispersed nyob rau hauv lub matrix thiab tsim ib tug thermally conductive network saw, thermal conductivity ntawm composite yog ho txhim kho.

2.5 Interface kuj thiab interface coupling zog
Nyob rau hauv dav dav, lub interfacial compatibility ntawm cov inorganic muab tub lim thiab cov organic resin matrix yog tsis zoo, thiab cov muab tub lim yog yooj yim agglomerated nyob rau hauv lub matrix, ua rau nws nyuaj rau tsim ib tug uniform dispersion.Tsis tas li ntawd, qhov sib txawv ntawm qhov sib txawv ntawm qhov sib txawv ntawm cov inorganic muab tub lim thiab cov matrix ua rau nws nyuaj rau qhov chaw ntawm qhov muab tub lim kom ntub dej los ntawm cov resin matrix, uas ua rau cov voids ntawm qhov sib cuam tshuam ntawm ob, yog li ua rau qhov sib txawv thermal kuj. ntawm lub polymer composite.

3. Cov lus xaus
High thermal conductivity yas ntim nrog graphene muaj thermal conductivity thiab thermal stability zoo, thiab lawv txoj kev vam meej yog dav heev.Dhau li ntawm cov thermal conductivity, graphene muaj lwm yam zoo heev, xws li lub zog siab, siab hluav taws xob thiab kho qhov muag, thiab yog siv dav hauv cov khoom siv mobile, aerospace, thiab cov roj teeb tshiab.

Hongwu Nano tau tshawb fawb thiab tsim cov ntaub ntawv nanomaterials txij li xyoo 2002, thiab raws li kev paub dhau los thiab cov thev naus laus zis siab heev, kev lag luam-taw qhia, Hongwu Nano muab ntau yam kev pabcuam customized los muab cov neeg siv nrog cov kev daws teeb meem sib txawv rau kev siv tau zoo dua.