改性氧化石墨烯和石墨烯填充橡胶复合材料的制备及性能研究

发布时间：2018-02-26 17:02

  本文关键词： 氧化石墨烯 石墨烯 天然橡胶 力学性能 导热性能　出处：《南京理工大学》2015年硕士论文　论文类型：学位论文

【摘要】：氧化石墨烯(GO)和石墨烯(GE)作为二维纳米填料,具有优异的力学性能和导热性能,是橡胶补强填料的极佳选择。但是GO和GE在橡胶中易于团聚,影响其对橡胶的补强效果。本文选用聚乙烯吡咯烷酮(PVP)作为改性剂,对GO进行改性,研究了改性GO(PGO)对天然橡胶(NR)、羧基丁腈橡胶(XNBR)、丁苯橡胶(SBR)的物理机械性能、热稳定性及导热性能等的影响。研究结果表明:PVP的加入显著改善了 GO在不同橡胶基体中的分散性能。对于NR基体,填充4份的PGO可使NR的拉伸强度达到26.65MPa,比NR空白胶提升了 55%。5份的PGO使NR的撕裂强度增加到51.36 kN/m,比NR空白胶提升了 159%,交联密度提升了 170%,导热系数提升了 26%。对于XNBR基体,3份PGO使XNBR的撕裂强度和导热系数相比GO/XNBR分别提升了 54%和25%,而拉伸强度变化不大。在SBR基体中,填充3份PGO可使SBR的拉伸强度达到10.92 MPa,比SBR空白胶和GO/SBR分别提升493%和72%,导热系数分别提高了 29%和14%。对PGO的进一步还原制备了能够在水中均匀分散的PVP改性GE(PGE)溶液,然后与NR胶乳进行混合制备了 PGE/NR复合材料。随着PGE填充量的增加,力学性能、热稳定性和导热性能等不断增加。当PGE填充量为3份时,PGE/NR的拉伸强度和撕裂强度分别比NR空白胶提升了 23%和146%,Tmax最大可提升9.8℃。此外,PGE/NR在-70℃和25℃时的储能模量和导热系数分别提升了 59%,313%和31%。
[Abstract]:As two dimensional nano-fillers, graphene oxide (GOO) and graphene (GE) have excellent mechanical properties and thermal conductivity, so they are the best choice for rubber reinforcing fillers, but go and GE are easy to agglomerate in rubber. In this paper, polyvinylpyrrolidone (PVP) was used as modifier to modify go. The physical and mechanical properties of modified GOPGOA on natural rubber, carboxylic acrylonitrile-butadiene rubber (XNBR) and styrene butadiene rubber (SBR) were studied. The results showed that the dispersity of go in different rubber matrix was significantly improved with the addition of 1: PVP. The tensile strength of NR reached 26.65 MPA after filling 4 phr of PGO, 55 parts of PGO increased the tear strength of NR to 51.36 KN / m, 159% of NR increased, crosslinking density increased 170% and thermal conductivity increased 26%. The tear strength and thermal conductivity of XNBR were increased by 54% and 25 parts of PGO compared with GO/XNBR, respectively, but the tensile strength did not change much. In SBR matrix, the tear strength and thermal conductivity of XNBR were increased by 54% and 25 parts, respectively. The tensile strength of SBR reached 10.92 MPA by filling 3 phr of PGO, which was 493% and 722 MPA higher than that of SBR and GO/SBR, respectively, and the thermal conductivity was increased by 29% and 14, respectively. The solution of PVP modified GEP was prepared by further reduction of PGO. Then the PGE/NR composites were prepared by mixing with NR latex. With the increase of PGE content, the mechanical properties were obtained. The tensile strength and tear strength of PGE / NR were increased by 23% and 146% Tmax, respectively, when the content of PGE was 3 phr. In addition, the energy storage of PGE / NR at -70 鈩，

本文编号：1538891