《厦门大学学报（自然科学版）》

采用优化的Hummers法制备氧化石墨烯(GO),利用硅烷偶联剂KH550对其进行改性,得到改性氧化石墨烯(KH550-GO); 将其与蒙脱土(MMT)复合成二元填料添加到甲基乙烯基硅橡胶(MVQ)中,得到了KH550-GO/MMT/MVQ复合材料.研究了KH550-GO和MMT的纳米片层复合现象以及KH550-GO/MMT二元填料的添加对复合材料力学性能和阻燃性能的影响.结果表明:在超声后的水溶液中,KH550-GO和完全剥离的MMT可以形成复合纳米片层结构; 与纯MVQ相比,添加质量分数为5%的KH550-GO/MMT(质量比为3:2)后复合材料的拉伸强度提高到1.83 MPa,极限氧指数(LOI)从30.8%提高到38.5%,残炭率提高了7个百分点,炭层结构更加致密.

By modification of graphene oxide(GO)with γ-aminopropyltriethoxysilane(KH550),KH550-GO was made using Hummers method.KH550-GO/montmorillonite(MMT)was prepared as a flame retardant and a reinforcing agent to the methyl vinyl silicone rubber(MVQ)to obtain KH550-GO/MMT/MVQ composites.The effects of KH550-GO/MMT nanomaterials on the flame retardancy and mechanical properties of the composites were investigated.The results showed that MMT and KH550-GO crosslinked in the aqueous solution after ultrasonic treatment and produced hydrogen bonds,both of which formed nanocomposite lamellae.Compared with the pure MVQ,the performance of composite with 5%(by mass)KH550-GO/MMT(mass ratio of 3:2)was as follows:the tensile strength increased to 1.83 MPa,the limit oxygen index(LOI)increased from 30.8% to 38.5%,the carborn residue rate increased by 7 percentage points,and the thermal decomposition stability was greatly improved with more dense carbon residue.

引言
1 实验部分
2 结果与讨论
3 结论

图1 KH550、GO和KH550-GO的FT-IR谱图<br/>Fig.1 FT-IR spectra of KH550,GO and KH550-GO

图1 KH550、GO和KH550-GO的FT-IR谱图
Fig.1 FT-IR spectra of KH550,GO and KH550-GO

图2 GO(a)、MMT(b)、KH550-GO(c)和KH550-GO/MMT(d)的水溶液<br/>Fig.2 GO(a),MMT(b),KH550-GO(c)and KH550-GO/MMT(d)solutions

图2 GO(a)、MMT(b)、KH550-GO(c)和KH550-GO/MMT(d)的水溶液
Fig.2 GO(a),MMT(b),KH550-GO(c)and KH550-GO/MMT(d)solutions

表1 复合材料的合成条件及其力学性能<br/>Tab.1 Synthesis conditions and mechanical properties of composites

表1 复合材料的合成条件及其力学性能
Tab.1 Synthesis conditions and mechanical properties of composites

图3 GO(a)和KH550-GO/MMT(b)的SEM图<br/>Fig.3 SEM images of GO(a)and KH550-GO/MMT(b)

图3 GO(a)和KH550-GO/MMT(b)的SEM图
Fig.3 SEM images of GO(a)and KH550-GO/MMT(b)

$图4 MVQ(a)和KH550-GO/MMT/MVQ复合材料(b)的断面SEM图<br/>Fig.4 SEM images of the fractured surface of MVQ(a)and KH550-GO/MMT/MVQ composite(b)$

图4 MVQ(a)和KH550-GO/MMT/MVQ复合材料(b)的断面SEM图
Fig.4 SEM images of the fractured surface of MVQ(a)and KH550-GO/MMT/MVQ composite(b)

图6 KH550-GO/MMT/MVQ复合材料残炭表面的SEM图<br/>Fig.6 SEM images of the residual carbon surface of KH550-GO/MMT/MVQ composites

图6 KH550-GO/MMT/MVQ复合材料残炭表面的SEM图
Fig.6 SEM images of the residual carbon surface of KH550-GO/MMT/MVQ composites

图5 KH550-GO/MMT添加量不同时复合材料的LOI<br/>Fig.5 LOI of composites with different additive amounts of KH550-GO/MMT

图5 KH550-GO/MMT添加量不同时复合材料的LOI
Fig.5 LOI of composites with different additive amounts of KH550-GO/MMT

图7 MVQ与KH550-GO/MMT/MVQ在氮气气氛下的TGA(a)和DTG(b)曲线<br/>Fig.7 TGA(a)and DTG(b)curves of of MVQ and KH550-GO/MMT/MVQ composite in N2 atmosphere

图7 MVQ与KH550-GO/MMT/MVQ在氮气气氛下的TGA(a)和DTG(b)曲线
Fig.7 TGA(a)and DTG(b)curves of of MVQ and KH550-GO/MMT/MVQ composite in N2 atmosphere

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备注

引言

1 实验部分

2 结果与讨论

3 结论

学报简介

备注

引言

1 实验部分

2 结果与讨论

3 结 论

学报简介

3 结论