Iiplastiki eziphezulu ze-thermal conductivity zibonisa iitalente ezingaqhelekanga kwii-inductors ze-transformer, i-electronic component heat dissipation, iintambo ezikhethekileyo, ukupakishwa kwe-elektroniki, i-potting ye-thermal kunye nezinye iindawo zokuqhuba kakuhle, ixabiso eliphantsi kunye ne-conductivity egqwesileyo ye-thermal.Iiplastiki eziphezulu ze-thermal conductivity ezine-graphene njenge-filler zinokuhlangabezana neemfuno zoxinaniso oluphezulu kunye nophuhliso oluphezulu lwendibano yokudibanisa kulawulo lwe-thermal kunye ne-electronics industry.

Iiplastiki ze-thermal conductive eziqhelekileyo zizaliswe kakhulu ngetsimbi ephezulu eqhuba ukushisa okanye i-inorganic filler particles ukuze zizalise ngokufanayo izinto ze-polymer matrix.Xa isixa sokuzalisa sifikelela kwinqanaba elithile, umfaki wenza i-chain-like kunye ne-network-like morphology kwinkqubo, oko kukuthi, ikhonkco yenethiwekhi ye-thermally conductive.Xa i-orientation direction yala matyathanga e-mesh conductive ubushushu ihambelana nolwalathiso lokuhamba kobushushu, i-thermal conductivity yenkqubo iphuculwe kakhulu.

Iiplastiki eziphezulu ze-thermal conductive ngei-carbon nanomaterial graphenenjengoko i-filler inokuhlangabezana neemfuno zoxinaniso oluphezulu kunye nophuhliso oluphezulu lwendibano yokudibanisa kulawulo lwe-thermal kunye neshishini lombane.Ngokomzekelo, i-thermal conductivity ye-polyamide ecocekileyo ye-6 (PA6) yi-0.338 W / (m · K), xa izaliswe nge-50% ye-alumina, i-thermal conductivity ye-composite yi-1.57 amaxesha e-PA6 ecocekileyo;xa ukongeza i-25% i-zinc oxide elungisiweyo, i-thermal conductivity ye-composite iphindwe kathathu ngaphezu kwe-PA6 ecocekileyo.Xa i-graphene nanosheet ye-20% yongezwa, i-thermal conductivity ye-composite ifikelela kwi-4.11 W/(m•K), eyandiswe ngamaxesha angaphezu kwe-15 kune-PA6 ecocekileyo, ebonisa amandla amakhulu egraphene kwintsimi yolawulo lwe-thermal.

1. Ukulungiswa kunye ne-thermal conductivity ye-graphene / i-polymer composite

I-conductivity ye-thermal ye-graphene / i-polymer composite ayinakuhlukaniswa kwiimeko zokucubungula kwinkqubo yokulungiselela.Iindlela ezahlukeneyo zokulungiselela zenza umehluko kwi-dispersion, isenzo se-interfacial kunye nesakhiwo sesithuba sokuzalisa kwi-matrix, kwaye ezi zinto zinquma ukuqina, amandla, ukuqina kunye ne-ductility ye-composite.Ngokubhekiselele kuphando lwangoku, kwi-graphene / i-polymer composites, iqondo lokusasazeka kwegraphene kunye neqondo lokukrazulwa kwamaphepha egraphene anokulawulwa ngokulawula ukucheba, ubushushu kunye nezinyibilikisi zepolar.

2. Izinto ezichaphazela ukusebenza kwegraphene zazalisa iiplastiki eziphezulu ze-thermal conductivity

2.1 Imali eyongeziweyo yeGraphene

Kwiplastiki ye-thermal conductivity ephezulu egcwele i-graphene, njengoko inani le-graphene linyuka, i-thermal conductive network chain yenziwa ngokuthe ngcembe kwinkqubo, ephucula kakhulu ukuhanjiswa kwe-thermal yezinto ezidibeneyo.

Ngokufunda i-thermal conductivity ye-epoxy resin (EP)-based graphene composites, kufunyenwe ukuba umlinganiselo wokuzaliswa kwegraphene (malunga ne-4 layers) unokunyusa ukuhanjiswa kwe-thermal ye-EP malunga namaxesha angama-30 ukuya kwi-6.44.I-W/(m•K), ngelixa i-thermal conductive fillers yemveli ifuna i-70% (iqhezu levolumu) yesigcwalisi ukuphumeza esi siphumo.

2.2 Inani leeleya zegraphene
Kwi-multilayers graphene, uphononongo kwi-1-10 ye-graphene yafumanisa ukuba xa inani le-graphene lenyuswa ukusuka kwi-2 ukuya kwi-4, i-thermal conductivity yehla ukusuka kwi-2 800 W/(m•K) ukuya kwi-1300 W/(m•K) ).Oku kulandela ukuba i-thermal conductivity yegraphene ithande ukuhla ngokunyuka kwenani leeleya.

Oku kungenxa yokuba i-graphene ye-multilayer iya ku-agglomerate kunye nexesha, eliya kubangela ukuba i-thermal conductivity yehle.Ngexesha elifanayo, iziphene kwigraphene kunye nokuphazamiseka komphetho kuya kunciphisa ukuhanjiswa kwe-thermal yegraphene.

2.3 Iindidi zesubstrate
Amacandelo aphambili eeplastiki eziphezulu ze-thermal conductivity ziquka izinto ze-matrix kunye nezigcwalisi.I-Graphene iyona nto ikhethwa kakhulu kwiifayili ngenxa ye-conductivity yayo ye-thermal.I-Polyamide (PA) ineempawu ezintle zomatshini, ukuchasana nokushisa, ukuxhatshazwa kokugqoka, i-coefficient ephantsi ye-friction, i-flame retardancy ethile, ukucutshungulwa lula, ukulungele ukuzaliswa kokuguqulwa, ukuphucula ukusebenza kwayo kunye nokwandisa intsimi yesicelo.

Uphononongo lufumanise ukuba xa iqhezu umthamo graphene 5%, conductivity thermal we composite ngamaxesha 4 aphezulu ngaphezu kwepolymer eqhelekileyo, kwaye xa iqhezu umthamo graphene lonyuswa ukuya 40%, conductivity thermal we composite. inyuswe ngamaxesha angama-20..

2.4 Ulungiselelo kunye nokuhanjiswa kwegraphene kwi-matrix
Kufunyaniswe ukuba ukupakishwa okuthe nkqo kwegraphene kunokuphucula ukuhanjiswa kwe-thermal.
Ukongezelela, ukusasazwa kwe-filler kwi-matrix nayo ichaphazela ukuqhutyelwa kwe-thermal ye-composite.Xa i-filler ihlakazwa ngokufanayo kwi-matrix kwaye yenza ikhonkco yenethiwekhi ye-thermal conductive, i-thermal conductivity ye-composite iphuculwe kakhulu.

2.5 Ukumelana ne-interface kunye namandla okudibanisa ujongano
Ngokubanzi, ukuhambelana kobuso phakathi kwamasuntswana okuzalisa i-inorganic kunye ne-organic resin matrix ayilunganga, kwaye amasuntswana okugcwalisa adityaniswa ngokulula kwi-matrix, okwenza kube nzima ukwenza ukusasazwa okufanayo.Ukongeza, umahluko kuxinzelelo lomphezulu phakathi kwamasuntswana okuzalisa i-inorganic kunye ne-matrix yenza kube nzima kumphezulu wamasuntswana okugcwalisa ukuba umanziswe yi-matrix ye-resin, okukhokelela kwi-voids kwi-interface phakathi kwezi zimbini, ngaloo ndlela kwandisa ukumelana nobushushu obuphakathi. yokwakheka kwepolymer.

3. Isiphelo
Iiplastiki eziphezulu ze-thermal conductivity ezizaliswe nge-graphene zine-conductivity ephezulu ye-thermal kunye nokuzinza okulungileyo kwe-thermal, kwaye amathemba abo ophuhliso abanzi kakhulu.Ngaphandle kwe-thermal conductivity, igraphene inezinye iipropathi ezigqwesileyo, ezinjengokuqina okuphezulu, iipropathi zombane eziphezulu kunye ne-optical, kwaye isetyenziswa kakhulu kwizixhobo eziphathwayo, i-aerospace, kunye neebhetri zamandla amatsha.

I-Hongwu Nano ibiphanda kwaye iphuhlisa ama-nanomaterials ukusukela ngo-2002, kwaye ngokusekwe kumava aqolileyo kunye netekhnoloji ephucukileyo, ejolise kwintengiso, iHongwu Nano ibonelela ngeenkonzo ezahlukeneyo ezilungiselelwe ubuchwephesha ukubonelela abasebenzisi ngezisombululo ezahlukeneyo zobuchwephesha kwizicelo ezisebenzayo ezisebenzayo.