环氧树脂/超支化聚合物修饰碳纳米管复合材料的固化反应动力学研究

采用非等温差示扫描量热法（DSC）研究纯环氧树脂（EP）、环氧树脂/碳纳米管复合材料（EP/MWCNTs）、环氧树脂/超支化聚酯修饰碳纳米管复合材料（EP/MWCNTs-H204）和环氧树脂/超支化聚酰胺修饰碳纳米管复合材料（EP/MWCNTs-N103）4种体系的固化动力学。基于Kissinger方法和Ozawa方法计算了各体系反应的活化能。结果表明：经过超支化聚合物修饰的EP/MWCNTs-H204和EP/MWCNTs-N103体系比未经修饰的其余两个体系,具有较低的表观活化能,说明超支化聚合物的引入对环氧树脂复合材料的固化反应具有显著的促进作用。采用Málek方法得出自动催化模型（Sesták-Berggren）,利用Sesták-Berggren对各体系进行理论计算,提出了描述固化过程的动力学参数和方程式。理论计算结果与实验结果进行对比相似度较高,说明Sesták-Berggren模型可以很好地描述4种不同环氧树脂体系的固化动力学行为。     

超支化聚合物的制备及其应用

超支化聚合物由于具有独特的结构和性能而成为研究热点之一.介绍了超支化聚合物的制备方法,主要有缩聚反应、加成反应、开环聚合、接枝反应等.论述了超支化聚合物的研究应用情况,如合成嵌段共聚物、用于聚合物的增韧、药物缓释剂等.     

超支化聚合物的应用研究进展

对近几年超支化聚合物的应用研究进展进行了综述。超支化聚合物的性能介于线形聚合物和体形聚合物之间,目前主要用作聚合物共混改性剂、热固性树脂增韧剂、染色助剂、药物缓释剂、超支化液晶,并在涂料及聚合物薄膜方面获得较广泛应用。     

超支化聚合物在塑料中的应用

对超支化聚合物在塑料中的应用研究进展进行了综述，旨在加深人们对该领域的了解从而加速该领域的快速发展。     

超支化聚合物应用研究进展

综述了国内外有关超支化聚合物（HBP）／线性聚合物共混物的形态结构、热性能、动态力学性能、流变性能和物理力学性能的应用研究进展，对今后HBP的应用前景进行了展望和预测。     

SiO2基超支化聚合物的研究及应用进展

综述了SiO2基超支化聚合物的研究和应用进展并介绍了超支化聚合物。     

超支化聚合物涂料

介绍了超支化聚合物的发展、特性，合成的简捷性及在涂料中的应用前景。     

超支化聚合物的制备方法研究现状及发展趋势

从多方面综述了超支化聚合物近些年来的研究现状以及其在生物应用、治疗和诊断、基因转染、组织工程和涂料应用等领域所发挥的重要作用,并重点对超支化聚合物常见的几种制备方法,例如缩聚法、开环聚合法和活性聚合法等进行了多方面优缺点的分析对比,同时对一些新兴的制备方法进行了总结。还对超支化聚合物未来的发展趋势与潜在价值进行了分析,并对当前超支化聚合物应用研究仍存在的技术难题的解决方法提出了意见与建议。     

超支化聚合物的性能研究

介绍了超支化聚合物结构特征,独特的溶液和本体性能,以及影响这些性能的主要因素.     

超支化聚合物用作抗癌药物载体的应用研究

超支化聚合物独特的三维分子结构使其具有低粘度、高反应活性、良好的溶解性和大量的末端可功能化基团等性质。也正因为它们的低毒性、可生物降解性及无免疫原性能,所以作为药物载体材料具有良好的发展前景。对超支化聚合物的结构特点及其应用做了简单的介绍,重点对两类超支化聚合物/抗癌药物载体材料,包括超支化聚合物/药物复合物抗癌载体材料和超支化聚合物/药物键合物抗癌载体材料的研究进行了综述。     

Hybrid modification of high‐density polyethylene with hyperbranched polyethylene‐functionalized multiwalled carbon nanotubes and few‐layered graphene

Herein, a facile method has been reported to efficiently prepare debundled multiwalled carbon nanotubes (MWCNT) and few‐layered graphene using a hyperbranched polyethylene (HBPE), and as hybrid fillers, their modification effects on high‐density polyethylene (HDPE) are well demonstrated. Stable dispersions of debundled MWCNT and graphene in chloroform were respectively obtained by sonication using the HBPE as stabilizer, and MWCNT/graphene/HDPE ternary nanocomposites were then fabricated by solution‐assisted premixing and subsequent melt mixing, at a fixed mass ratio of MWCNT/graphene of 3:1 and serially changed filler loadings. It is found that the MWCNT and graphene have good dispersibility in the composites, and as hybrid fillers, they can effectively form composite net‐like structure, which makes them show better modification effects on both the electrically and thermally conductive properties of HDPE, as compared to the single MWCNT. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017 , 134, 44848.     

Dispersion and noncovalent modification of multiwalled carbon nanotubes by various polystyrene‐based polymers

This article investigated the dispersion and modification of multiwalled carbon nanotubes (MWCNTs) through solution mixing based on the noncovalent interactions between polystyrene (PS) and MWCNTs. It was found that the interactions were robust enough to stabilize the debundled MWCNTs in solution after vigorous sonication. The PS attached, which altered the surface properties of MWCNTs and made them easily soluble in organic solvents, can remain even after careful washing with solvents. Besides, many other PS‐based polymers were proved to retain the ability to disperse MWCNTs to form stable solutions. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci, 2008     

纳米碳管的制备及其应用

本文综述了纳米碳管的制备及应用,展望了纳米碳管广阔的应用前景。     

碳纳米管在环氧树脂改性中的应用研究进展

阐述了碳纳米管(CNTs)在EP(环氧树脂)基复合材料中的应用情况,着重讨论了CNTs表面改性的原因及其对EP基复合材料性能(包括力学性能、热性能和电性能等)的影响,并介绍了国内外该类复合材料的研究成果。最后对CNTs/EP基复合材料的研究方向进行了展望。     

High-toughening modification of polylactic acid by long-chain hyperbranched polymers

The hyperbranched polyester synthesized by “one-step method” was grafted with stearic acid to obtain long-chain hyperbranched polymers (LCHBPs) with a large number of long stearic acid chains at the end. By means of FTIR and ¹³C-NMR characterization, it was proved that stearic acids were grafted onto hyperbranched polyesters (HBPE) to yield LCHBPs successfully. It was determined by GPC and hydroxyl value titration that the number average molecular weight of HBPE was 4.86 × 10³ and the grafting rate of stearic acid was 47%. Polylactic acid (PLA)/LCHBPs blends were prepared by melt processing method. The results showed that comparing with neat PLA, the tensile strength of PLA/LCHBPs blends decreased slightly with the increase of LCHBPs, but still maintained a high level, while the elongation at break and the impact strength of the PLA with 3.0 phr LCHBPs were greatly improved by 1360.0% and 119.8%, respectively. In addition, the impacted fracture characteristics of PLA changed significantly from brittle fracture to ductile fracture after LCHBPs incorporation, with the formation of a large number of filamentous structures. Thus, LCHBPs was an excellent toughening modifier for PLA and the resulting blends with improved performance possess wider applications.     

Sidewall modification of single-walled carbon nanotubes using photolysis of perfluoroazooctane

Photolysis of perfluoroazooctane in the presence of single-walled carbon nanotubes (SWNTs) led a sidewall modification of SWNTs to form perfluorooctyl functional groups. The introduction of the perfluoroalkyl substituent was confirmed by Raman, XPS, FT-IR, mass and UV-vis-NIR measurements. This method is useful for sidewall modification of SWNTs with perfluorooctyl moiety due to no formation of byproducts and no destruction of SWNTs electronic behavior by heavy modification.     

碳纳米管/聚氨酯功能复合材料的制备与应用

介绍了碳纳米管的处理、碳纳米管/聚氨酯复合材料的制备方法：碳纳米管的处理方法有表面处理改性和局部活化改性2种; 碳纳米管/聚氨酯复合材料的制备方法有物理共混法和原位聚合法。结合碳纳米管和聚氨酯的特性,综述了碳纳米管/聚氨酯复合材料在力学性能的增强、电子材料、智能材料、生物医学材料和节能材料等方面的应用,并对CNTs/PU复合材料未来的研究工作提出了几点意见。     

碳纳米管修饰及在电化学领域的应用

凭借出色的力学、电学性能和化学稳定性,碳纳米管在电化学、纳米器件、能源、催化等领域具有广泛的应用前景。但是,分散性差、化学活性低等缺点极大地限制了碳纳米管的应用。本文主要介绍了了碳纳米管的共价修饰和非共价修饰,分析了各方法的差异和优缺点;并简要介绍了碳纳米管在环境分析、电化学生物传感器等电化学领域的主要应用。     

多壁碳纳米管的有机修饰与表征

为了增加多壁碳纳米管(MWCNTs)表面活性,通过浓H2SO4和浓HNO3处理过的MWCNTs与SOCl2回流进而与合成的N-乙基-3,6-二氨基咔唑反应,得到了有机修饰的MWCNTs.用傅立叶变换红外(FTIR)光谱对有机修饰的MWCNTs结构进行研究.研究结果结构表明:有机修饰的MWCNTs红外光谱在1617和16...     

A convenient route to modified multiwall carbon nanotubes with liquid crystal molecules via covalent functionalization

A novel nanocomposite of the rod‐like liquid crystal (LC) molecules' waist positions anchored on the surface (sidewalls and ends) of multiwall carbon nanotubes (MWNTs) was prepared by using a dissolving metal reduction method for the first time. The MWNTs carbanion complexes of lithium were first synthesized in tetrahydrofuran with an electron transfer from lithium naphthalene radical anion on the surface of MWNTs. Then the novel material (LC‐MWNTs) was obtained by treating the carbanion complexes with bromic liquid crystalline aromatic amide compound. The formation of the LC‐MWNTs was confirmed by both Raman and FTIR spectroscopies. HRTEM demonstrates that the rod‐like LC molecules are anchored on the surface of MWNTs via covalent attachment, with a wrapped thickness approximately 3‐4 nm. The loss‐weight fraction of the LC layers for the LC‐MWNTs can be roughly estimated as 23% by TGA. The experiments of solubility exhibit that the LC‐MWNTs forms a stable suspension solution in polar solvents such as dimethylformamide. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2012