碳纳米管功能化表面修饰研究进展

由于碳纳米管表面缺陷少、缺乏活性基团,并且具有很强的范德华力和很高的长径比,严重的影响了它的应用。本文从共价修饰和非共价修饰两方面,介绍了目前碳纳米管功能化修饰的方法和研究状况。从催化、医疗、材料等方面着重介绍了功能化修饰后的碳纳米管一些最新应用进展,并展望了碳纳米管的发展与应用前景。     

碳纳米管增强环氧树脂基复合材料研究进展

综述了国内外碳纳米管共价功能化和非共价功能化研究现状以及以碳纳米管增强环氧树脂的力学、电学、热学、吸波和摩擦等性能的应用研究进展,并指出了今后的研究发展方向。     

离子液体在碳纳米管功能化及复合材料中的应用研究进展

离子液体具有低毒性、不易挥发、高的离子传导率、高的化学和热稳定性等特殊的性质,近几年在碳纳米管中的应用研究引起了广泛的关注.本文作者综述了离子液体近年来在碳纳米管的共价功能化、非共价功能化和聚合物复合材料中的应用研究进展,重点论述了其优势及展望.     

碳纳米管的功能化及其在复合材料中的应用分析

碳纳米管的结构独特,性能优异,而且具备可以低成本大规模的获得、良好的热稳定性以及可以调节的电子亲和力等特点,成为众多科学家关注的焦点,但是由于它不能够溶于水和有机溶剂,在实际应用方面也就受到了一定的制约,分析了碳纳米管的共价功能化、非共价功能化、和混杂功能化的修饰方法,并对其在金属基、聚合物基、陶瓷基等复合材料中的应用进行分析。     

碳纳米管的分散及其在防腐涂料中的研究进展

在纳米填料中,碳纳米管具有出色的耐化学性、机械稳定性及导电性等特性,在增强有机涂层的机械性能和耐腐蚀性能方面发挥着重要作用。但是碳纳米管与聚合物基体的界面相互作用较弱,难以分散在聚合物中。本文综述了碳纳米管的分散方法,包括机械分散、共价功能化和非共价功能化处理,并概述了不同分散方法的优缺点,相继评述了碳纳米管在有机防腐涂料中的防腐机理及研究进展,包括溶剂型、水性及粉末防腐涂料,最后对碳纳米管防腐涂料的未来发展方向进行了展望。     

碳纳米管的表面功能化修饰机理及方法研究

碳纳米管作为一种一维纳米材料具有优异的性能,但是由于自身结构导致的不溶性,以及易于团聚和缺乏表面功能基团等实际问题,限制了其应用范围,因此,碳纳米管功能化修饰是碳纳米管应用研究的重点领域,本文介绍了碳纳米管表面功能化的几种主要方法:机械分散功能化、共价功能化、非公价功能化等,结合国内外研究进展,对碳纳米管功能化修饰的机理及方法进行综述。     

表面活性剂非共价功能化处理制备碳纳米管悬浊液

分别以十二烷基苯磺酸钠、十二烷基磺酸钠、十二烷基硫酸钠、十二烷基聚氧乙烯(23)醚、十六烷基三甲基溴化铵等表面活性剂为分散剂,水为溶剂,超声波作用下对硝酸纯化的碳纳米管进行非共价功能化处理,制备了初始浓度为2 g/L的碳纳米管悬浊液,并对处理后的碳纳米管进行定性分析. 结果表明,功能化处理后,表面活性剂吸附到碳纳米管表面,促进碳纳米管的分散. 定量分析了碳纳米管悬浊液的浓度,并根据碳管浓度随时间的变化研究悬浊液的稳定性. 结果表明,表面活性剂功能化处理所制碳纳米管悬浊液存放240 h后趋于稳定,碳纳米管浓度不再下降,最终碳纳米管悬浊液浓度因所用表面活性剂不同而在1.68~1.84 g/L范围内略有差异.     

碳纳米管有机修饰和在生物、医学材料中的应用

这篇综述主要从碳纳米管的有机共价修饰和有机非共价修饰方面着手,重点阐述碳纳米管有机修饰的原理和方法,并且综合国内外的现状,研究了功能化的碳纳米管在生物、医学材料上的应用,展望了有机修饰的碳纳米管今后发展的热点方向。     

碳纳米管氧化功能化及其表征方法的研究进展

综述了碳纳米管氧化功能化的常用方法,评析了氧化条件对功能化效果的影响,介绍了碳纳米管结构表征的手段,指明了氧化功能化对碳纳米管实际应用的意义。     

功能化改性多壁碳纳米管的制备方法研究

通过浓硝酸氧化法制备了功能化改性的多壁碳纳米管,同时研究了回流温度、回流时间及分离方式对多壁碳纳米管功能化效果的影响,并通过红外光谱仪、SEM和TEM方法对功能化改性后的多壁碳纳米管进行了表征。实验结果显示,用浓硝酸在80℃的温度下回流6h,过氧化氢浸泡24h后,离心分离制备得到的功能化改性后的多壁碳纳米管形貌最好。     

Study on the performance of syntactic foam reinforced by hybrid functionalized carbon nanotubes

Hollow glass microspheres (HGMs)/epoxy syntactic foam were reinforced by hybrid functionalized carbon nanotubes that were synthesized by simultaneous covalent and noncovalent functionalization of carbon nanotubes. The effect of hybrid functionalized carbon nanotubes on density, mechanical properties, and water absorption of HGMs/epoxy syntactic foam was studied. The study indicated that the dispersion of carbon nanotubes in epoxy resin can be improved by hybrid functionalization. The compression strength of syntactic foam reinforced by hybrid functionalized carbon nanotubes was significantly enhanced. The maximum compressive strength of syntactic foam corresponding to chitosan modified carbon nanotubes approached 60 MPa. Hybrid functionalized carbon nanotubes had little effect on the water absorption ability of syntactic foam, and was less than 1%. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020 , 137, 48586.     

碳纳米管在聚合物基体中的分散方法

综述了碳纳米管（CNTs）在聚合物基体中的分散方法，包括直接分散法和表面修饰法，其中表面修饰又根据是否形成共价键分为两类，重点叙述了近几年成为研究热点的非共价键修饰法。直接分散法简单、快捷，保证了CNTs的结构完整性，但分散效果较差；表面修饰法通过共价键或非共价键的方式对CNTs的表面进行改性，克服了直接分散法的缺点，但共价键的形成会破坏CNTs的结构完整性，造成CNTs其他性能的下降，而非共价键修饰又存在结合不牢固的问题。因此，CNTs在聚合物基体中的分散方法仍是今后聚合物／CNTs复合材料应用中需要解决的一个重点问题。     

Crystallization induced block copolymer decoration on carbon nanotubes

A unique noncovalent means to decorate block copolymers on carbon nanotubes (CNTs) using a controlled polymer crystallization method is presented. Transmission electron microscope observation and electron diffraction result demonstrated the surface functionalization of CNTs with a crystalline-noncrystalline triblock copolymer poly(vinylcyclohexane)-b-poly(ethylene)-b-poly(vinylcyclohexane) (PVCH-PE-PVCH), forming a novel nano-hybrid epitaxial brush structure, which consists of a central CNT and disc-shaped folded-chain lamellae of PE blocks with random coils of amorphous PVCH blocks surrounding them.     

碳纳米管功能化的途径、机理和表面特征

由碳纳米管的功能化有共价键和非共价键两种方法。共价键功能化的机理是通过氧化或还原反应在碳纳米管表面生成极性或反应性基团(表面基团化),继而通过化学反应使碳纳米管表面有机化或聚合物化。非共价键功能化的机理是基于碳纳米管表面的?体系和疏水性可与含?电子的芳烯化合物发生?-?相互作用或与含疏水链的表面活性剂发生物理吸附。本文综述碳纳米管功能化的研究进展,完善了Kim等提出的碳纳米管功能化表面的代数表示:表面基团化的为1G,表面有机化的为2G,表面聚合物化的为3G。     

Strategic Immobilization of Molecular Catalysts onto Carbon Nanotubes via Noncovalent Interaction for Catalytic Organic Transformations

Since their discovery, carbon nanotubes (CNTs) continue to attract growing interest from scientists in a wide range of fields, likely due to their fascinating nanoarchitecture as well as their electronic and physical properties. From the viewpoint of synthetic chemistry, the chemical and physical stability, high surface area, and π-stacking nature of CNTs are attractive features for their application as solid supports for molecular catalysts. The chemical functionalization of CNTs has been explored for various applications, including covalent and noncovalent grafting of molecular catalysts. Although noncovalent grafting provides less stable immobilized catalysts compared with covalently grafted hybrid molecular catalysts and CNTs, the preparation protocol is expeditious and repetitive use of the catalysts is well demonstrated, confirming their potential broad utility in synthetic organic chemistry.     

Thionine-mediated chemistry of carbon nanotubes

Thionine can be employed as a kind of useful functional molecule for the non-covalent functionalization of carbon nanotubes, as it shows a strong interaction with either SWNTs or MWNTs. Attachment of thionine molecules onto the sidewalls of carbon nanotubes would improve the solubility and lower the thermal stability of original carbon nanotubes. More importantly, it may functionalize the surface of carbon nanotubes with rich NH₂ groups and therefore open up more opportunities for the surface chemistry of carbon nanotubes. It has been proved that through the modification of small thionine molecules, other kinds of species such as cytochrome C and TiO₂ nanoparticles could be easily and selectively introduced onto the surface of carbon nanotubes. With this approach, SWNTs or MWNTs can be tailored with desired functional structures and properties.     

Tailored dielectric and mechanical properties of noncovalently functionalized carbon nanotube/poly(styrene‐b‐(ethylene‐co‐butylene)‐b‐styrene) nanocomposites

The preparation of high‐dielectric poly(styrene‐b‐(ethylene‐co‐butylene)‐b‐styrene) (SEBS) composites containing functionalized single‐walled carbon nanotubes (f‐SWCNTs) noncovalently appended with dibutyltindilaurate are reported herein. Transmission electron microscopy and X‐ray photoelectron and Raman spectroscopy confirmed the noncovalent functionalization of the SWCNTs. The SEBS‐f‐SWCNT composites exhibited enhanced mechanical properties as well as a stable and high dielectric constant of approximately 1000 at 1 Hz with rather low dielectric loss at 2 wt% filler content. The significantly enhanced dielectric property originates from the noncovalent functionalization of the SWCNTs that ensures good dispersion of the f‐SWCNTs in the polymer matrix. The f‐SWCNTs also acted as a reinforcing filler, thereby enhancing the mechanical properties of the composites. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013     

碳纳米管/纤维素在不饱和聚酯树脂中的分散性及力学性能研究

在超声改善MWCNT在不饱和聚酯树脂的分散性的基础上,通过非共价官能团化的方法引入处理过的天然填料柠檬酸化纤维素（CNFCA）来增强不饱和聚酯树脂,并采用偏光显微镜、旋转流变仪、透射电子显微镜、扫描电子显微镜、万能试验机等对不饱和聚酯树脂纳米复合材料的结构和性能进行了研究。结果表明,MWCNT的加入可以使不饱和聚酯复合材料的拉伸性能提高,通过溶剂辅助超声的方法可以使MWCNT的分散性提高,从而进一步提高不饱和聚酯纳米复合材料的力学性能;CNFCA的加入使得不饱和聚酯树脂纳米复合材料的力学性能得到较大程度的提高;超声分散和研磨的方法可以有效地将CNFCA和MWCNT结合在一起,从而提高其在不饱和聚酯中的分散能力。     

化学功能化修饰碳纳米管的表征方法探究

本文探讨了化学功能化修饰碳纳米管的表征方法,从形态形貌、光谱学、化学组成等方面对碳纳米管功能化的表征方法进行了综述。     

Very short functionalized carbon nanotubes for membrane applications

The cutting and functionalization of carbon nanotubes is described, applying a single-step ball-mill based process. Very short carbon nanotubes bearing primary amine functions were produced, characterized and incorporated in polymeric membranes. The gas separation performance of the composite membranes was tested.