PET基导电复合材料制备及其性能的研究

发布时间：2018-03-23 08:21

  本文选题：聚对苯二甲酸乙二醇酯　切入点：碳纳米管　出处：《天津工业大学》2017年硕士论文　论文类型：学位论文

【摘要】：课题以聚对苯二甲酸乙二醇酯(PET)为研究对象,以多壁碳纳米管(MWNT)和导电碳黑(CB)为导电组分,对PET进行导电功能改性研究。用原位聚合法制备PET/MWNT、PET/MWNT/CB导电复合材料,以熔融共混法制备PET/MWNT、PET/PA6/MWNT导电复合材料。借助表面电阻测试、场发射扫描电镜(FESEM)、差示扫描量热仪(DSC)、热重分析(TG)、透射电镜(TEM)和万能拉伸机等手段对复合材料进行了结构表征和性能测试。结果表明:原位聚合能使MWNT较均匀地分散在PET基体中。复合材料的导电性能随MWNT含量增加而提高。MWNT的加入对PET有很好的诱导结晶作用。在MWNT含量为0.2wt%时,复合材料的结晶性能、力学性能和热稳定性最好。CB与MWNT在PET中能形成"共支撑"网络结构和复合导电通路,产生协同导电效应。当二者总含量在0.5 wt%时,复合材料的表面电阻为1011Ω。CB和MWNT的加入对PET有明显的诱导结晶作用,但CB诱导结晶的能力低于MWNT。通过单因素分析和逐步筛选的方法,确定熔融共混的最优工艺条件为:共混温度275℃,共混时间14min,螺杆转速为150rpm。在不改变MWNT含量的情况下,通过条件的改变可以将复合材料的导电性提高2-3个数量级。PET/PA6复合材料中,随二者共混比例的变化,相形态发生"海岛"结构-"共连续"结构-"海岛"结构的变化。加入MWNT后,MWNT在两相体系及两相界面之间均存在。随着MWNT含量增加,PET/PA6/MWNT复合材料的导电性能增加。PET与PA6的结晶性相互影响,加入MWNT能够诱导PET与PA6结晶,加快其结晶速度。
[Abstract]:In this paper, polyethylene terephthalate polyethylene terephthalate (PET) was used as the research object, and multi-walled carbon nanotubes (MWNTN) and conductive carbon black (CBCBB) were used as conductive components to modify the conductive function of PET. In situ polymerization method was used to prepare PET / MWNTN / CB composites. The conductive composite PET / MWNTT / PET / PA / Mwnt was prepared by melt blending. Field emission scanning electron microscopy (SEM), differential scanning calorimeter (DSC), thermogravimetric analysis (TG), transmission electron microscopy (TEM) and universal tensile machine (Tem) were used to characterize the structure and properties of the composites. The results show that in situ polymerization can make MWNT evenly separated. The conductive properties of the composites increased with the increase of MWNT content. The addition of Mwnt could induce the crystallization of PET. When the content of MWNT was 0.2 wt%, The crystalline properties, mechanical properties and thermal stability of the composites are the best. CB and MWNT can form a "co-supporting" network structure and a composite conductive path in PET, resulting in a synergistic conductive effect. When the total content of CB and MWNT is 0.5 wt%, The surface resistance of the composites was 1011 惟. CB and MWNT had obvious effect on inducing crystallization of PET, but the ability of CB to induce crystallization was lower than that of MWNT.Through the method of single factor analysis and step by step screening, The optimum technological conditions of melt blending were determined as follows: blending temperature 275 鈩，

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