【正文】 劑載體是使用： CNT （的Baytubes C150P ，拜耳公司） ，炭黑（的Printex XE2B ，贏創(chuàng)工業(yè)集團(tuán)） ，石墨（ KFL ， Kropfmu?hl AG）和薄水鋁石（ 40的Disperal ，由Sasol德國友情提供） 。催化劑，二氯〔 3,4,5 三甲基1 （8 喹啉基）2 三甲基硅烷基 環(huán)戊二烯基]鉻（三） （ CR1） ，下面的程序前面報道過. MAO，購自Crompton ， Al含量為10重量％的甲苯、在干燥的氬氣氛下，存儲在一個手套箱（布勞恩MB 150B G II ） 。甲苯（無水） ，正庚烷（無水的） ，和三異丁基鋁（TIBAL ，1M的己烷溶液）購自SigmaAldrich公司購買。實驗部分材料與一般注意事項。 FG與比較其它納米粒子比較，如MWCNT ，納米尺度的勃姆石，炭黑，和傳統(tǒng)的石墨。在這里，我們對單中心鉻（III）約束幾何催化劑固定化在無乳化劑的MAO浸漬的FG納米片的分散體中的正庚烷進(jìn)行匯報。但是，與助催化劑甲基鋁氧烷（MAO） ,30 35的杜波依斯成功地采用微米級石墨填料在PFT工藝生產(chǎn)熱塑性聚乙烯/石墨復(fù)合材料的分散體。據(jù)Yan et al.，之前除了1 ％（重量）的FG壓縮成形顯著提高了耐磨損性。這是較理想的石墨烯（ 2630平方米/小得多G） .25,26剪切后的微米級，手風(fēng)琴狀FG的顆粒形態(tài)借助于超聲處理，大功能化石墨烯顆粒完全瓦解提供單FG納米片。主要的氧在溫度高于400℃的功能對應(yīng)于羥基基團(tuán)，而環(huán)氧基，羰基和羧基基團(tuán)進(jìn)行在這樣的溫度下快速熱解。他們表現(xiàn)出卓越的性能，包括超高強度，在室溫下傳遞超高速電子，非常高的剛性，多種羥基官能石墨烯是可用的。 SP2 這個單層雜化的碳原子排列在一個蜂窩狀格。在我們的研究中，我們調(diào)查的PFT與FG納米片作為納米填料和催化劑載體。C, and the stirring speed at 1000 rpm. Polymerization was stopped byinjecting acidi?ed methanol. The polymer was ?ltered off and dried for16 h at 65 176。C for 16 h in vacuo. Furthermore,after addition of MAO, the activated support was washed with freshheptane to remove excess MAO. Ethylene polymerizations werecarried out in a 200 mL doublejacket steel reactor equipped with amechanical stirrer and connected to a thermostat. To the reactor wereadded dry nheptane (80 mL) and triisobutylaluminum (TiBAl。C) under an N2 atmosphere to produce FG The properties of the nanoparticles employed inpolymerization ?lling are summarized in Table 1.Table 1. Materials Used as Catalyst Supportsspeci?c surface areaamaterial (m2/g) elemental analysisb (%)particle morphology of FG by means of sonication, the largeFG particles pletely disintegrate to afford single FGnanosheets. This is re?ected by a massive increase in thespeci?c surface area from 600 to around 1800 m2/ Since FGwith a high surface area has an ultralow bulk density, PFT is theFGcarbon blackgraphiteboehmite600104030200 (C), (H), (O) (C) (C)process of choice for producing polyole?n/FG master batchesthat can be added to conventional polyole?n matrices.According to Yan et al., the addition of 1 wt % FG prior topression molding signi?cantly improves the wear resist Simultaneously with the improved wear resistance thebiopatibility of UHMWPE is not Several groups have used graphite and FG in PFT. However,most catalysts failed to produce UHMWPE. Pretreatment ofthe ?ller with cocatalyst methylaluminoxane (MAO) is one ofthe most monly used approaches for effective immobilization of metallocene and postmetallocene ,30?35Dubois successfully employed micrometersized graphite ?llersin a PFT process to produce thermoplastic PE/graphiteposites with an effective ?ller FG nanoposites with lowmolecularweight thermoplasticHDPE,37,38 LDPE,39 LLDPE,40 iPP,41 and other polymerssuch as polyaniline have been ?46 To the best of ourknowledge, there are no reports on PFT processes forproducing UHMWPE/FG nanoposites using FG nanosheets as the catalyst support.Here we report on singlesite chromium(III) constrainedgeometry catalysts immobilized on emulsi?erfree MAOimpregnated FG nanosheet dispersions in nheptane. Thisnovel catalyst generation is employed in PFT to produce newUHMWPE/FG nanoposite families. FG is pared withother nanoparticles such as MWCNT, nanometerscalemultiwall carbon 250 (C)nanotubesnanofoam NF20 1200 a bDetermined using BET N2 absorption. Determined by elementalanalysis. . = not determined.Catalyst Preparation and Ethylene Polymerization. Thecatalyst was prepared by heating the support for 2 h in vacuo at 110176。由此納米復(fù)合材料表現(xiàn)出改善的納米填料的分散性和Macromoleculesconventional Yet, considerably less is known withrespect to PFTproducing UHMWPE nanoposites. Recently, Rastogi et al. reported on the formation of UHMWPEnanoposites prepared by PFT using salicylaldiminecatalysts supported on TiO2, ZrO2, and CNT. The resultingnanoposites exhibited improved nano?ller dispersion andhigher entanglement molar ,14In our research, we investigated PFT with FG nanosheets asnano?llers and catalyst support. Graphenes are carbon sheetswith a thickness of one carbon atom. This single layer of sp2hybridized carbon atoms is arranged in a honeyblikelattice. With an atomic diameter of nm and a sheet widthof several micrometers, the aspect ratio of typical graphenes islarger than 10 000. They exhibit exceptional properties,including ultrahigh strength, ultrafast electron transport atroom temperature, extraordinarily high stiffness, and abrasionresistance as well as strong UV and IR In additionto the highly perfect ideal graphenes, a variety of hydroxylfunctionalized graphenes are ?19 The preparation ofFG was pioneered by Boehm and coworkers in 196921 byusing graphite oxide (GO), which was ?rst synthesized byBrodie at Oxford University over 160 years Thermal orchemical reduction of GO provides FG ,24 Theoxygen content of this layered pound is controlled by thetemperature of the reduction process and decreases withincreasing reduction temperature. The predominant oxygenfunctionality at temperatures above 400 176。最近， Rastogi醫(yī)師等。在聚合進(jìn)行中填充技術(shù)（ PFT）。在催化聚合填料（ “原位聚合” ）的存在下，以生產(chǎn)傳統(tǒng)的熱塑性聚烯烴化合物被廣泛地使用，具有非常高的填料含量。這樣的石墨烯納米薄片含有超過60石墨烯納米片生產(chǎn)超高分子量聚乙烯/ ％（重量） .傳統(tǒng)生產(chǎn)超高分子量聚乙烯復(fù)合材料，是將石墨氧化物（ GO）和化學(xué)還原的石墨氧化物分散在稀釋劑如乙醇，然后在模壓前噴涂到超高分子量聚乙烯粉末。應(yīng)當(dāng)指出的該干粉混合納米粒子的安全預(yù)防措施和處理程序，以防止排放，??粉塵爆炸，吸入或吸收納米粒子而產(chǎn)生健康危害。前提是實現(xiàn)有效的分散，各向異性納米顆?？娠@著改善聚烯烴的性能。床單，部件和纖維都是有超高分子量聚乙烯生產(chǎn)的。I在polymerization filling, the integration of a nanoparticle dispersion into the polymerization process eliminated the need for special聚合填充物，納米顆粒分散體的融合到聚合過程消除了safety and handling precautions typically required by conventional pounding of nanoparticles with ultralow bulk densiti通常需要由納米粒子具有超低容積密度的混合安全和處理措施。Owing to the presence of surface