本文選題：聚對(duì)苯二甲酸乙二醇酯　切入點(diǎn)：碳納米管　出處：《天津工業(yè)大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：課題以聚對(duì)苯二甲酸乙二醇酯(PET)為研究對(duì)象,以多壁碳納米管(MWNT)和導(dǎo)電碳黑(CB)為導(dǎo)電組分,對(duì)PET進(jìn)行導(dǎo)電功能改性研究。用原位聚合法制備PET/MWNT、PET/MWNT/CB導(dǎo)電復(fù)合材料,以熔融共混法制備PET/MWNT、PET/PA6/MWNT導(dǎo)電復(fù)合材料。借助表面電阻測(cè)試、場(chǎng)發(fā)射掃描電鏡(FESEM)、差示掃描量熱儀(DSC)、熱重分析(TG)、透射電鏡(TEM)和萬(wàn)能拉伸機(jī)等手段對(duì)復(fù)合材料進(jìn)行了結(jié)構(gòu)表征和性能測(cè)試。結(jié)果表明:原位聚合能使MWNT較均勻地分散在PET基體中。復(fù)合材料的導(dǎo)電性能隨MWNT含量增加而提高。MWNT的加入對(duì)PET有很好的誘導(dǎo)結(jié)晶作用。在MWNT含量為0.2wt%時(shí),復(fù)合材料的結(jié)晶性能、力學(xué)性能和熱穩(wěn)定性最好。CB與MWNT在PET中能形成"共支撐"網(wǎng)絡(luò)結(jié)構(gòu)和復(fù)合導(dǎo)電通路,產(chǎn)生協(xié)同導(dǎo)電效應(yīng)。當(dāng)二者總含量在0.5 wt%時(shí),復(fù)合材料的表面電阻為1011Ω。CB和MWNT的加入對(duì)PET有明顯的誘導(dǎo)結(jié)晶作用,但CB誘導(dǎo)結(jié)晶的能力低于MWNT。通過(guò)單因素分析和逐步篩選的方法,確定熔融共混的最優(yōu)工藝條件為:共混溫度275℃,共混時(shí)間14min,螺桿轉(zhuǎn)速為150rpm。在不改變MWNT含量的情況下,通過(guò)條件的改變可以將復(fù)合材料的導(dǎo)電性提高2-3個(gè)數(shù)量級(jí)。PET/PA6復(fù)合材料中,隨二者共混比例的變化,相形態(tài)發(fā)生"海島"結(jié)構(gòu)-"共連續(xù)"結(jié)構(gòu)-"海島"結(jié)構(gòu)的變化。加入MWNT后,MWNT在兩相體系及兩相界面之間均存在。隨著MWNT含量增加,PET/PA6/MWNT復(fù)合材料的導(dǎo)電性能增加。PET與PA6的結(jié)晶性相互影響,加入MWNT能夠誘導(dǎo)PET與PA6結(jié)晶,加快其結(jié)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，

本文編號(hào)：1652648