NR/有机蒙脱土/GMA纳米复合材料的制备与性能研究

采用胶乳接枝插层法制备NR／有机蒙脱土／甲基丙烯酸缩水甘油酯(GMA)纳米复合材料，并对其性能进行研究。结果表明，在NR胶乳与有机蒙脱土体系中加入GMA，并使之原位聚合，同时实现对NR的接枝和对有机蒙脱土的插层并与有机蒙脱土层间的基团产生化学结合，可以制备NR／有机蒙脱土／GMA纳米复合材料；采用胶乳接枝插层法制备的NR／有机蒙脱土／GMA纳米复合材料的物理性能和耐热氧老化性能优异，动态力学性能良好，热稳定性与NR胶料相差不大。     

天然橡胶／蒙脱土／白炭黑纳米复合材料老化性能的研究

采用机械混炼法．以白炭黑作为填料,制得具有纳米结构的天然橡胶（NR）／改性蒙脱土（GMMT）／白炭黑复合材料．进行了抗热氧老化、抗臭氧老化和抗紫外光老化实验．并对老化后的NR／GMMT体系的复合材料进行了交联密度和X-射线衍射分析（XRD）。结果表明．GMMT的加入增强了NR的性能．在老化前后都显示较优的综合性能;经历各种老化后。材料的层间距有所增大。     

硅烷偶联剂对蒙脱土/NR纳米复合材料气体阻隔性能的影响

试验研究硅烷偶联剂对蒙脱土（MMT）／NR纳米复合材料性能的影响。结果表明，在MMT／NR复合材料中加入硅烷偶联剂，可提高复合材料的物理性能、耐热空气老化性能、气体阻隔性能和热稳定性。硅烷偶联剂KH-560的改性效果最好，其最佳用量为3份。     

固相改性有机蒙脱土/炭黑/NR复合材料的耐老化性能研究

试验研究固相改性有机蒙脱土(GMMT)/炭黑/NR复合材料的耐热氧、耐臭氧和耐紫外光老化性能。结果表明,与炭黑/NR复合材料相比,GMMT/炭黑/NR复合材料热氧、臭氧和紫外光老化前后的综合物理性能均较优;X射线衍射分析表明,老化前后GMMT/炭黑/NR复合材料的层间距变化不大,老化过程不影响GMMT在NR基体中的分散。     

乳液插层法制备丁苯橡胶/天然橡胶/蒙脱土纳米复合材料的研究

采用乳液插层法制备了丁苯橡胶/天然橡胶/蒙脱土（SBR/NR/MMT）纳米复合材料。采用透射电子显微镜研究了复合材料的亚微观形态,并对复合材料的性能进行了研究。透射电镜结果显示,制备出了插层型的SBR/NR/MMT复合材料。当蒙脱土含量较低时,SBR/NR/MMT纳米复合材料的力学性能随蒙脱土用量的增加而增大。SBR/NR/MMT复合材料的耐油性能随蒙脱土含量的增加而提高。蒙脱土的加入对纳米复合材料的耐磨性能没有太大影响。     

原位乳液插层法制备丁腈橡胶/蒙脱土纳米复合材料的研究

结合乳液插层蒙脱土的特点，利用原位插层制备了丁腈橡胶（NBR）／改性蒙脱土（HOMMT）纳米复合材料。通过X-射线衍射（XRD）及透射电镜（TEM）证实和分析了蒙脱土的纳米分散相结构。物理性能的研究表明，所制备的复合材料体现了纳米材料的一些特点，填充少量蒙脱土，复合材料的物理机械性能即达到一个较高的水平。     

聚苯胺改性蒙脱土/天然橡胶纳米复合材料的制备与性能

采用原位聚合法制备了聚苯胺质量分数为20% 的聚苯胺改性蒙脱土,并以此作为增强剂利用机械混炼法制备了聚苯胺改性蒙脱土( PANI － MMT) /天然橡胶( NR) 纳米复合材料。使用X 射线衍射仪、傅里叶变换红外光谱仪及扫描电镜等对PANI － MMT 和PANI － MMT/NR 复合材料的结构进行了表征,并考察了PANI － MMT/NR 复合材料的力学性能。结果表明,PANI － MMT/NR 复合材料形成了插层型纳米结构; 与普通的有机蒙脱土/NR 复合材料相比,PANI － MMT/NR 复合材料的力学性能明显提高,PANI － MMT 添加质量为20 份时其力学性能达到最好,并超过了添加40 份炭黑N 660 的NR 的力学性能。     

有机蒙脱土改性环氧树脂的研究

利用离子交换反应制备了有机蒙脱土，用插层聚合法制得了有机蒙脱土／改性环氧树脂纳米复合材料。利用傅立叶红外光谱（FTIR）、X射线衍射（XRD）、元素分析对有机蒙脱土进行了表征，探讨了长链烷基季铵盐类表面活性剂与蒙脱土片层的界面作用对复合材料性能的影响。     

丁腈橡胶/有机蒙脱土纳米复合材料的结构及性能研究

通过机械共混法制备了丁腈橡胶/有机蒙脱土（NBR/OMMT）纳米复合材料。运用X射线衍射（XRD）和透射电镜（TEM）表征了复合材料的纳米结构。通过硫化仪研究了有机蒙脱土用量对复合材料硫化性能的影响,同时研究了复合材料的力学性能、热空气老化性、耐油性和热稳定性。结果表明：有机蒙脱土的加入在一定程度上提高了复合材料的力学性能、热空气老化性、耐油性及热稳定性,而且对复合材料的硫化性能有明显的影响。     

聚丙烯／三元乙丙橡胶／改性蒙脱土纳米复合材料的制备和性能

用马来酸酐和苯乙烯改性蒙脱土得到改性蒙脱土（SMA-MMT），然后用熔融共混法制备了聚丙烯（PP）／三元乙丙橡胶（EPDM）／改性蒙脱土纳米复合材料，且加入接枝物PP-g-MAH-St作为相容剂。X射线衍射分析显示SMA-MMT的层间距达到3．98nm。透射电镜分析表明聚合物分子链已经插入蒙脱土片层中。接枝物含量为15％（质量分数，下同）时，复合材料的力学性能达到最好，拉伸强度和冲击强度分别为32．4MPa和79．5J／m。差示扫描量热分析结果表明，PP-g-MAH-St和SMA-MMT的加入可以改善PP的结晶性能，当PP-g-MAH-St和SMA-MMT含量分别为15％和2％时，复合材料中PP的结晶温度为120℃。     

黏土/天然橡胶纳米复合材料的制备及性能

利用乳液插层法制备了黏土／天然橡胶纳米复合材料,研究了该复合材料的力学性能、应力应变行为、耐磨性、气体阻隔性和耐老化性能。结果表明,黏土／天然橡胶纳米复合材料与高耐磨炭黑(N330)、白炭黑增强橡胶相比,邵尔A型硬度、定伸应力和撕裂强度较高,拉伸强度相当。黏土、N330以及白炭黑对天然橡胶的拉伸结晶有影响,填料用量对材料拉伸强度的影响存在最佳值。黏土／天然橡胶纳米复合材料具有良好的耐磨性、气体阻隔性和耐老化性能。     

单体接枝改性炭黑填充NR复合材料的研究

采用单体接枝改性法制备炭黑填充型NR复合材料，并对其性能进行研究。结果表明，在NR胶乳与炭黑的混合体系中加入适当的单体M(BA，MMA或GMA)和引发剂，使单体M与NR大分子发生接枝反应的同时，与炭黑表面的活性基团发生反应，制备NR／M／炭黑复合材料；该复合材料的物理性能和耐热氧老化性能优异，热稳定性和抗湿滑性良好。     

Thermal stability,aging properties,and flame resistance of NR‐based nanocomposite

Polymer/clay nanocomposites have some unique properties due to combination of flame resistance and improved mechanical and thermal stability properties which are important to enhance the material quality and performance. The objective of this work was to investigate the effect of organically modified montmorillonite (org‐MMT) on the thermal and flame retardant as well as hardness and mechanical properties of the nanocomposites based on the natural rubber (NR). It was shown that by the addition of 3 wt % of org‐MMT to NR, its aging hardness rise was decreased more than 55% and the ignition time was delayed about 150%. The reduction in heat release rate peak value was equal to 54% compared to the pristine NR. Addition of org‐MMT improved the thermal stability of the NR. Furthermore, nanocomposites which were calendared before curing showed much more thermal stability and fire resistance than those which contained similar amount of organoclay. © 2010 Wiley Periodicals, Inc. J Appl Polym Sci, 2011     

Curing Characteristics and Aging Properties of Natural Rubber/Epoxidized Natural Rubber and Cellulose II

In this work, natural rubber (NR) and regenerated cellulose (cel II) latexes were co-coagulated and to the mixture epoxidized natural rubber (ENR) was added on a two-roll mill. The cellulose content was fixed at 20 phr while ENR content varied from 0 to 75 phr. The influence of ENR was studied through the cure characteristics, aging and dynamic-mechanical properties. The aging provides nanocomposites with better solvent resistance and increased tensile strength at ENR content of 25 phr. The results suggest that a new type of light-colored nanocomposites were obtained, which presented high mechanical performance and resistance to solvents.     

胶乳-悬浮液共沉法天然橡胶/埃洛石纳米管复合材料的结构与性能

利用天然橡胶(NR)胶乳和埃洛石纳米管(HNTs)悬浮液的负电稳定性,采用胶乳-悬浮液共沉法制备了NR/HNTs复合材料,并对其硫化特性、微观结构、力学性能以及动态力学性能进行了研究.结果表明,HNTs的引入可促进NR的硫化反应,随HNTs用量的增加,焦烧期和正硫化时间缩短;HNTs在复合材料中的分散性极佳;随着HNTs用量的增加,纳米复合材料的定伸应力和邵尔A硬度明显增大,扯断伸长率有所下降,综合力学性能在20份时最好;随着HNTs用量的增加,纳米复合材料的玻璃化转变温度略有升高,转变区的损耗因子明显下降.     

有机蒙脱土对天然橡胶/丁苯橡胶的补强及增容作用

采用机械混炼法制备了天然橡胶(NR)/丁苯橡胶(SBR)/有机蒙脱土(OMMT)纳米复合材料,采用TEM和XRD对复合材料的亚微观结构进行了表征,并对复合材料的表观交联密度、静态力学性能、动态力学性能和硫化热效应进行了研究。结果表明,复合材料为剥离型纳米复合材料;OMMT能够明显提高纳米复合材料的交联密度和静态力学性能;OMMT导致NR/SBR共混胶动态损耗因子降低,并且能够促使NR和SBR玻璃化转变温度更为接近,起到了增容作用;OMMT实现了NR和SBR两相的同步硫化。     

Structure and flammability properties of NR‐organoclay nanocomposites

The nanocomposites of natural rubber (NR) and organoclay modified by tributyl phosphate (TMMT) were prepared by the mixing intercalation method and the structure and the flammability properties of them were studied. The structure of the NR‐TMMT nanocomposites were characterized by X‐ray diffraction, transmission electron microscopy, fourier transform infrared spectroscopy and the results show that the d‐spacing of TMMT increase substantially with tributyl phosphate addition and the layers of TMMT disperse in rubber matrix on a nanometer scale. The flammability properties of them were demonstrated by cone calorimeter and indicate that the NR‐TMMT nanocomposites have significantly decreased in heat release rate, mass loss rate, and smoke produce rate. The NR‐TMMT nanocomposites appears very good the flame retardant properties. POLYM. COMPOS., 2009. © 2008 Society of Plastics Engineers     

Preparation and properties of natural rubber nanocomposites with solid‐state organomodified montmorillonite

A novel organomodified montmorillonite prepared by solid‐state method and its nanocomposites with natural rubber were studied. The nanocomposites were prepared by traditional rubber mixing and vulcanizing process. The properties of solid‐state organomodified montmorillonite were investigated by Fourier‐transform infrared spectroscopy (FITR) and thermogravimetric analysis (TGA). The dispersion of the layered silicate in rubber matrix was characterized by X‐ray diffraction (XRD) and transmission electron microscopy (TEM). The results showed that the nanocomposites consisting of solid‐state organomodified montmorillonite and natural rubber are obtained. The solid‐state organomodified montmorillonite can not only accelerate the curing process, but also improve the mechanical and aging resistance properties of NR. The properties improvement caused by the fillers are attributed to partial intercalation of the organophilic clay by NR macromolecules. In addition, the dynamic mechanical analysis (DMA) results showed a decrease of tanδmax and increase of T_g when the organoclay is added to the rubber matrix, which is due to the confinement of the macromolecular segments into the organoclay nanolayers and the strong interaction between the filler and rubber matrix. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci, 2008