固相法改性纳米碳酸钙对丁苯橡胶的补强作用

研究了用带有酚醛结构的反应性有机改性剂对纳米碳酸钙进行固相改性得到的M—CaCO3填充丁苯橡胶（SBR）所得复合材料的力学性能、热稳定性能、微观形态和老化性能．并与丁苯橡胶／硬脂酸包覆型纳米碳酸钙（CCR）复合材料的性能进行比较。结果表明，M—CaCO3对SBR力学性能和热稳定性能的提高比CCR更显著，且M—CaCO3能改善SBR的老化性能。电镜观察表明，M—CaCO3在SBR中的分散性优于CCR．且界面结合形态得到了改善。M—CaCO3添加量为20～40份时。复合材料综合力学性能最好。     

天然橡胶/改性纳米碳酸钙复合材料的形态与力学性能

比较了3种改性纳米碳酸钙,如硬脂酸改性的纳米碳酸钙(CCR)、CCR的固相改性纳米碳酸钙(M—CCR)、悬浮改性纳米碳酸钙(M—CaCO3)与天然橡胶组成的复合材料硫化胶的力学性能和形态。结果表明,3种复合材料的硫化胶与天然橡胶硫化胶相比,其力学性能得到了明显改善,其中含有M—CaCO3的复合材料力学性能的提高和形态的改善优于含有CCR和M—CCR者。     

反应型纳米碳酸钙补强NR的研究

采用具有反应性的改性剂,在纳米碳酸钙水悬浮液中进行改性,制备一种新型改性纳米碳酸钙（简称M-CaCO3）及其与NR的复合材料,对改性前后纳米碳酸钙的结构和形态进行分析,并对NR/纳米碳酸钙复合材料的结构和性能进行研究.结果表明,与未改性纳米碳酸钙相比,改性纳米碳酸钙的透过率下降,在正己烷中的分散性明显提高;NR/M-CaCO3复合材料具有良好的界面相容性和耐热分解性能、较高的交联密度以及优良的综合物理性能和耐老化性能,M-CaCO3的最佳用量为8份.     

纳米碳酸钙在NR/BR/SBR并用胶中的应用研究

采用带有酚醛基的反应性有机改性剂对纳米碳酸钙CCR进行改性制得M-CCR,并制备了NR/BR/SBR/CCR和NR/BR/SBR/M-CCR复合材料,研究了两种复合材料的微观形态以及力学性能和加工性能。结果表明,M-CCR在并用胶中的分散性优于CCR,对并用胶力学性能的提高更显著;两种填料都能改善并用胶的加工性能,并且不影响并用胶的抗湿滑性和滚动阻力。     

纳米SiO_2/NR复合材料老化性能的研究

本文研究了纳米SiO2/NR复合材料制备方法。硅烷偶联剂Si69用量和纳米SiO2用量对纳米SiO2NR复合材料力学性能和老化性能的影响。结果表明,乳液共凝法制备的纳米SiO2NR复合材料力学性能和耐老化性能优于机械共混法制备的纳米SiO2NR复合材料力学性能和耐老化性能。加入Si69后,纳米SiO2NR复合材料力学性能和耐老化性能得到改善。在天然橡胶中加入纳米SiO2,改善了天然橡胶的力学性能和耐老化性能。     

纳米碳酸钙/ZDMA共增强NBR

比较了NBR与ZDMA及3种纳米碳酸钙(U—CaCO3,CCR,M-CaCO3)组成的复合材料硫化胶的力学性能和结构形态。结果表明,NBR／M—CaCO3／ZDMA三元复合体系的力学性能明显提高,其结构形态的改善明显优于其他体系。M—CaCO3和ZDMA对NBR的共增强作用明显。     

NR／BR／OMMT纳米复合材料的研究（Ⅰ）复合材料的制备及表征

选用自制的3种有机蒙脱土（OMMT）。利用机械共混法制备了天然橡胶／顺丁橡胶／有机蒙脱土（NR／BR／OMMT）纳米复合材料,测试了复合材料的力学性能,研究了复合材料的耐老化和耐溶剂性能。结果表明：3种OMMT对复合材料的补强效果明显不同,其中2#OMMT为最佳．其断裂强度和撕裂强度均提高近1倍,耐老化和耐溶剂性能也最优异。     

丁腈橡胶/聚氯乙烯/有机蒙脱土纳米复合材料的结构与性能

采用胶乳共沉法和直接共混法制备了丁腈橡胶／聚氯乙稀／有机蒙脱土（NBR／PVC／OMMT）纳米复合材料。通过X射线衍射（XRD）法和透射电子显微镜（TEM）法对NBR／PVC／OMMT纳米复合材料的结构进行了袁征,并研究了复合材料的力学性能、耐油性能和耐老化性能。结果表明,2种方法所获得的复合材料是插层型纳米复合材料;胶乳共沉法制备的纳米复合材料中OMMT的分散更为均匀,其力学性能、耐油性能和耐老化性能优于直接共混法制备的复合材料。     

有机蒙脱土对三元共混胎面胶（NR／BR／SBR）结构与性能的影响

采用机械共混法制备了天然橡胶（NR）／顺丁橡胶（BR）／丁苯橡胶（sBR）／有机蒙脱土（OMMT）复合材料;用X射线衍射（xRD）和扫描电镜（SEM）对复合材料的结构进行了表征,并研究了OMMT对复合材料的物理机械性能、硫化性能、热稳定性能的影响。结果表明,该复合材料为插层型复合材料,添加5phrOMMT有利于提高复合材料力学性能、耐磨性能、热稳定性能,促进硫化,降低最低扭矩。     

纳米Fe3O4用量对纳米Fe3O4/NR复合材料性能影响的研究

采用乳液共凝法制备纳米Fe3O4/天然橡胶（NR）复合材料,所用纳米Fe3O4是用化学共沉淀法制备的纳米Fe3O4乳液。研究了纳米Fe3O4用量对纳米Fe3O4/NR复合材料的力学性能、热稳定性、加工性能的影响。结果表明：纳米Fe3O4的用量对纳米Fe3O4/NR复合材料的性能有较大的影响。在NR中加入纳米Fe3O4,混炼胶的G′较高,tanδ较小,提高了复合材料的力学性能和热稳定性。当纳米Fe3O4的质量分数为15%时,纳米Fe3O4/NR复合材料的综合性能较好。     

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     

Surface modification of nanocrystalline cellulose and its application in natural rubber composites

As a biopolymer with high mechanical strength, nanocellulose was generally considered as a green filler for reinforcing polymer. In this study, nanocrystalline cellulose (NCC) isolated from softwood pulp was successfully modified by cetyltrimethyl ammonium bromide (CTMAB), a cationic surfactant, and the modified nanocrystalline cellulose (m-NCC) was used to reinforce natural rubber (NR). In this composite architecture, it was found that when the filler content was 5 or 10 phr, the surface modification of NCC improved the dispersion state of NCC in NR matrix and the interfacial interaction between NR and NCC. Therefore, the NR/m-NCC composites exhibited outstanding mechanical properties, and its tensile strength, elongation at break and tear strength was increased by 132.8, 20, and 66.1%, respectively, compared to pristine NR composites. Besides, the modified NCC could accelerate the vulcanization and improve wet-skid resistance and aging resistance of NR composites. It is envisioned that the modified NCC has the potential to be generalized to manufacturing other polymer matrix composites strengthened with nanocellulose.     

改性棉籽蛋白对天然橡胶复合材料性能的影响

将间苯二酚-甲醛改性棉籽蛋白等量代替炭黑填充天然橡胶(NR),利用红外光谱对棉籽蛋白和改性棉籽蛋白进行对比分析,研究了棉籽蛋白用量对橡胶复合材料静态力学性能、热空气老化性能及生热和剪切动态性能的影响。结果表明,棉籽蛋白中的氨基被取代;改性蛋白质低于9份时NR的综合力学强度增加,回弹性提高,抗老化性能提高;改性蛋白质使橡胶复合材料的生热性能降低,储能模量升高,损耗因子降低。     

纳米二氧化钛填充橡胶复合材料的分散结构与性能

用粒径为20～40nm的纳米二氧化钛(B—TiO2)填充天然橡胶(NR)和丁腈橡胶(NBR)制备了橡胶复合材料,研究了B—TiO2在橡胶基体中的分散结构、复合材料的力学性能以及抗菌性能,并与德国Degussa公司的催化剂纳米TiO2(D—TiO2)进行了对比。结果表明,B—TiO2在NR和NBR中表现出良好的分散,绝大多数B—TiO2在橡胶中聚集体尺寸小于100nm,特别是在NR中B—TiO2分散颗粒大小与其原生颗粒大小相近,明显优于D—TiO2在NR中的分散;在B—TiO2用量小的情况下,橡胶复合材料的力学性能基本不受B—TiO2的影响。D—TiO2对橡胶复合材料的老化性能也没有影响。橡胶基体中填充B—TiO2后,其抗菌性能明显提高,当用量超过2份(质量)时,其抗菌性能已经达到较高的水平;D—TiO2／NR抗菌效果与B—TiO2／NR的抗菌效果相当,热氧老化不影响橡胶复合材料中TiO2发挥其抗菌特性。     

Preparation and performance of oleylamine modified silica-reinforced natural rubber composites

Oleylamine (OA) modified silica (SiO₂-g-OA) was prepared using γ-(2,3-epoxypropoxy) propytrimethoxysilane (KH560) and OA, silica/natural rubber (NR) and SiO₂-g-OA/NR composites were prepared by mechanical blending in an internal mixer, and SiO₂-g-OA was characterized by Fourier transform infrared spectroscopy, thermal gravimetric analyzer, and contact angle analyzer. The mechanical properties, abrasion resistance, curing characteristics, Payne effect, and morphology of silica/NR and SiO₂-g-OA /NR composites were investigated using universal testing machine, Akron abrasion tester, rubber processing analyzer, and scanning electron microscope, respectively. The results showed that SiO₂-g-OA became more hydrophobic and had better compatibility with NR. Moreover, SiO₂-g-OA/NR had weaker Payne effect, better vulcanization performance, and more excellent mechanical properties. As the content of filler was more than 30 phr, SiO₂-g-OA/NR had lower rolling resistance and higher wet skid resistance. Compared with silica modified by other coupling agents, SiO₂-g-OA had the best reinforcement effect on NR.     

碳纳米管/丙烯酸酯橡胶复合材料的制备及性能研究

采用自制的大分子表面改性剂对多壁碳纳米管(MWNTs)进行表面改性,制备改性MWNTs/丙烯酸酯橡胶(ACM)复合材料,研究改性MWNTs用量对复合材料性能的影响,并与炭黑补强的ACM性能进行对比.结果表明:用MWNTs填充ACM制备的材料,其性能远优于炭黑补强的ACM橡胶的性能;随着改性MWNTs用量的增大,复合材料...     

Thermal properties and aging characteristics of chemically modified oil palm ash-filled natural rubber composites

The chemically modified oil palm ash (OPA) with the cetyltrimethylammonium bromide (CTAB) solution was prepared prior to compounding with the natural rubber and other curing ingredients. The aging resistance and thermal stability of CTAB-modified OPA-filled natural rubber composites were evaluated in the same manner as non-modified OPA samples. The retention tensile properties after thermal aging was measured and based on the result shown, the CTAB-modified OPA-filled natural rubber composites imparted insignificant effect to aging resistance as compared to the non-modified OPA-filled natural rubber composites at very low OPA loading; however, the effect became apparent beyond 3 phr OPA loading where the CTAB-modified OPA-filled natural rubber composites provided better aging resistance than the corresponding non-modified OPA-filled natural rubber composites. The thermogravimetric analysis indicated that the CTAB-modified OPA-filled natural rubber composites exhibited lower thermal stability which showed lower temperature at their respective weight loss and lesser char residue than that of non-modified OPA-filled natural rubber composites. This was attributed to the CTAB which started to decompose at the temperature of 210 °C. However, for the range from ambient temperature to 210 °C, the CTAB-modified OPA-filled natural rubber composites produce better thermal stability than those of non-modified OPA-filled natural rubber composites.