【摘要】：石墨烯具有高比表面積,高導(dǎo)電率,高強(qiáng)度及良好的力學(xué)、熱學(xué)、光學(xué)等優(yōu)點(diǎn),以其作為填料或結(jié)構(gòu)單元與高分子聚合物復(fù)合,形成網(wǎng)絡(luò)締合結(jié)構(gòu),對原有材料進(jìn)行修飾得到穩(wěn)定性、強(qiáng)度及阻燃效果較好的聚合物/石墨烯復(fù)合材料。本文通過原位復(fù)合的方法得到聚烯烴/石墨烯復(fù)合材料,各項測試表明復(fù)合材料的性能較純聚烯烴有所提高,其中聚乙烯/20wt%石墨烯的導(dǎo)電率在聚乙烯/石墨烯復(fù)合材料中最高,為0.15S/m;聚乙烯/5wt%石墨烯的拉伸強(qiáng)度在聚乙烯/石墨烯復(fù)合材料中最大,為8.3MPa。聚己烯/20wt%石墨烯的導(dǎo)電率在聚己烯/石墨烯中最高,為0.21S/m,聚己烯/10wt%石墨烯的拉伸強(qiáng)度在聚己烯/石墨烯中最大,為6.1 MPa。通過改變蒽環(huán)上的取代基,成功制備出三維幾何結(jié)構(gòu)的N,N-二(2,6-二異丙基)-2,6-二叔丁基蒽烯-11,12-二亞胺溴化鎳(催化劑 Cat3),并研究了Cat3在不同助催化劑,壓強(qiáng)及溫度下的催化活性,其中0.5Mpa、70℃下,以DEAC為助催化劑催化乙烯聚合時的催化活性最大,為4.84×105gPE/(mol.Ni·h)。通過改變苊骨架上的取代基(苯基,對羥基苯基,對氨基苯基,對羥甲基苯基),成功合成四種α-二亞胺配體,其中以對羥基苯基和對羥甲基苯基為取代基,成功制備出N,N-二(2,6-二異丙基苯基)-5,6-二(4-對羥基苯基)苊烯-1,2-二亞胺溴化鎳(Cat4)與N,N-二(2,6-二異丙基苯基)-5,6-二(4-對羥甲基苯基)苊烯-1,2-二亞胺溴化鎳(催化劑Cat5),通過實驗數(shù)據(jù)表明這兩種催化劑在較高溫度70-80℃時依然具有較好的催化活性。Cat4、Cat5在0.5MPa,DEAC為助催化劑,均在50℃聚合溫度條件下到最大催化活性,分別為3.72×106gPE/(mol·Ni·h)、3.84×106gPE/(mol.Ni.h)。通過改變亞胺配體上的取代基合成出兩種新型α-二亞胺配體,并成功制備出N,N-二(2,6-二苯甲基-4-甲基)-5,6-二(4-對羥甲基苯基)苊烯-1,2-二亞胺溴化鎳(催化劑Cat6)后過渡金屬催化劑,通過實驗數(shù)據(jù)表明這種催化劑在較高溫度70-80℃時依然具有較好的催化活性。Cat6以DEAC為助催化劑,0.5MPa,80℃聚合溫度下催化乙烯聚合0.5h的催化活性最高,為4.66×106gPE/(mol·Ni·h)。
[Abstract]:Graphene has the advantages of high specific surface area, high conductivity, high strength and good mechanical, thermal and optical properties. The polymer / graphene composites with better stability, strength and flame retardancy were obtained by modifying the original materials. In this paper, polyolefin / graphene composites were obtained by in-situ recombination. The results show that the properties of the composites are better than those of pure polyolefin, and the conductivity of polyethylene / 20wt% graphene is the highest in polyethylene / graphene composites. The tensile strength of polyethylene / 5 wt% graphene was the highest in polyethylene / graphene composite, 8.3 MPA. The conductivity of polyhexene / graphene was the highest in polyhexene / graphene, 0.21s / m, and the tensile strength of polyhexene / graphene / graphene was 6.1 MPa.. By changing the substituent group on anthracycline, the three dimensional geometry Nndi (2O6-diisopropyl) -2O6-tert-Ding Ji anthrone 12-diimide nickel bromide (Cat3) was successfully prepared, and the catalytic activity of Cat3 at different cocatalyst, pressure and temperature was studied. The maximum catalytic activity of 0.5 MPAN was 4.84 脳 105gPE/ (mol.Ni h).) when DEAC was used as co-catalyst for ethylene polymerization at 70 鈩，

本文編號：2216506