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众所周知,炭黑广泛应用于橡胶工业,用来提高橡胶制品的强度和硬度。自从炭黑被发现以来,科学家们就一直致力于炭黑补强机理的研究和炭黑性能的改进工作。但在炭黑对硫反应的影响方面没有作深入的研究。通过测定硫化胶试样的交联密度,一些研究者认为,炭黑对硫化过程的影响不大。然而Koenig等用用^13C固态测定发现炭黑对硫化机理有影响。他们认为交联键由多硫结构经脱硫生成单硫结构,这会改变生成的基本网络结构。 相似文献
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采用3种方法对传统炭黑进行表面改性,考察了改性前后炭黑表面形貌及结构的变化,并采用改性炭黑填充天然橡胶(NR)/顺丁橡胶(BR)并用胶,考察了改性炭黑对并用胶力学性能、硫化特性及动态力学性能等的影响。结果表明,与未改性炭黑相比,细化粒径、调高pH值及木质素改性处理后,炭黑表面的粗糙程度增加;且细化改性炭黑具有更高的比表面积,调高pH值改性炭黑具有更多疏松的二次结构,木质素改性炭黑粒径略有增加。对于炭黑填充NR/BR,用细化粒径及调高pH值方法处理的炭黑进行填充,NR/BR硫化胶的力学性能、耐磨性能及抗湿滑性均得到明显改善,但硫化延迟效应明显;木质素改性后,炭黑填充胶的力学性能、耐磨性能均出现不同程度的降低。 相似文献
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硫化程度对天然橡胶动态性能的影响 总被引:5,自引:0,他引:5
用橡胶加工分析仪(RPA)分析硫化程度对天然橡胶未硫化胶和硫化胶的动态性能的影响。结果表明。未硫化胶的弹性模量、粘性模量均随着剪切频率的增加而增大;按0.5倍工艺正硫化时间进行硫化时,硫化胶的交联网络已经基本形成;按2倍工艺正硫化时问进行硫化时。交联程度下降,硫化返原明显。与达到工艺正硫化时问的硫化胶相比。硫化时间分别为2倍t90、0.5倍t90的硫化胶的弹性剪切模量随剪切频率、温度的增加而增大,随剪切应变的增加而降低;应变对未硫化胶动态性能的影响不明显。 相似文献
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马来酸酐在炭黑表面接枝聚合的研究 总被引:5,自引:0,他引:5
研究了过氧化苯甲酰引发马来酸酐在炭黑表面的接枝聚合反应,探讨了反应时间、引发剂用量、接枝单体用量对接枝率的影响。结果表明,接枝率随反应时间的延长而增加,但2h后,接枝率增加不多;随引发剂用量的增加,接枝率呈上升趋势,但用量在15mg以后,接枝率趋于定值;随接枝单体用量的增加,接枝率直线上升。在本实验条件下,接枝率达到9%。通过接枝产物的X射线光电子能谱及红外分析可以证实,马来酸酐已接枝到炭黑表面。从光学显微图像分析结果可知,马来酸酐接枝改性对炭黑在聚合物基体中的分布和分散性能起到良好的改善作用。 相似文献
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Effect of MAH modified
carbon black on dynamic mechanical properties of vulcanized natural rubber 总被引:3,自引:1,他引:2
用DMA研究了马来酸酐预处理炭黑对硫化天然橡胶动态力学性能的影响。结果表明,马来酸酐预处理炭黑有利于降低天然橡胶的滚动阻力。 相似文献
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通过添加阴离子表面活性剂,制备了稳定性能优异的炭黑分散液;然后将其添加到天然胶乳(NRL)中,采用胶乳共沉法制备NRL/炭黑复合材料,并对其物理性能、动态力学性能和内生热等进行了探讨。研究结果表明:当炭黑类型相同时,由胶乳共沉法制备的硫化胶之力学性能普遍优于由机械法制备的硫化胶;当采用炭黑N375补强时,由胶乳共沉法制备的硫化胶之力学性能相对最佳,其拉伸强度、撕裂强度和硬度分别比由机械法制备的硫化胶提高了6.5%、4.6%和8.8%;由胶乳共沉法制备的硫化胶之损耗因子(tanδ)小于由机械法制备的硫化胶,故前者的滞后损失更小、内生热更少且温升更低。 相似文献
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Rubber-grade carbon black filler HAF(N330) was modified with a plant product (PP; long aliphatic chain substituted phenols), a proprietary item under patent application, in the presence or absence of hexamine (Hexa) or dicumyl peroxide (DCP) to put a flexible moiety in between the carbon black and the elastomer chain in order to improve some of its processing and reinforcement characteristics in natural rubber (NR). The modification process is simple and involves cheap materials. The modified carbon black was characterized and evaluated for its processability as well as reinforcing characteristics in NR vulcanizate. It was observed to show better processing behavior, without any processing aid, such as easy incorporation and uniform dispersion in the rubber phase without abnormal heat generation, and also improved vulcanizate properties, such as tensile strength, flex cracking resistance, and lower abrasion loss, without affecting other properties to a significant extent. © 1997 John Wiley & Sons, Inc. J Appl Polym Sci 66: 683–693, 1997 相似文献
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改性炭黑增强三元乙丙橡胶的力学性能与加工性能 总被引:1,自引:0,他引:1
研究了用甲基丙烯酸缩水甘油酯(GMA)、甲基丙烯酸-2-羟乙酯(HEMA)和N-羟甲基丙烯酰胺(NMA)3种单体改性炭黑增强三元乙丙橡胶(EPDM)的力学性能,并用橡胶加工分析仪分析了GMA、HEMA和NMA改性炭黑对EPDM未硫化胶的加工性能。结果表明,GMA、HEMA和NMA改性炭黑均改善了EPDM硫化胶的力学性能,当其用量分别为3.75,3,3份时,EPDM硫化胶的定伸应力、拉伸强度和撕裂强度达到最佳值;降低频率、提高应变或温度有利于改善改性炭黑增强EPDM的加工性能。 相似文献
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Carbon black‐filled natural rubber composites were prepared using various types of natural rubber: unmodified natural rubber, epoxidized natural rubber with two levels of epoxy groups at 25 and 50 mol % [epoxidized natural rubber (ENR)‐25 and ENR‐50], and maleated natural rubber. Two types of carbon black (HAF and ECF) with different structure and surface area were used. The functional groups present in natural rubber and carbon black were characterized by FTIR and 1H‐NMR. Furthermore, cure characteristics, mechanical, morphological, and electrical properties of composites and gum rubber compounds were investigated. It was found that the presence of polar functional groups in rubber molecules and the different structures of carbon black significantly affected the cure characteristics and mechanical properties. This is attributed to physical and chemical interactions between carbon black surfaces and rubber molecules. It was also found that natural rubber filled with ECF showed the highest Young's modulus and hardness, which is due to the high‐surface area and structure of the ECF causing an increase in the degree of entanglement between rubber chains and carbon black particles. Frequency dependency of the dielectric constant, loss tangent, and AC conductivity was also investigated. An increase in dielectric constant, loss tangent, and AC conductivity was observed in the ENR/ECF composites. High‐carbon black loading level caused network formation of these conductive particles, increasing the AC conductivity of the composites. POLYM. COMPOS. 2012. © 2012 Society of Plastics Engineers 相似文献
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High-temperature molding of a mixture of epoxidized natural rubber (ENR) and intermediate super abrasion furnace (ISAF) carbon black results in strong rubber–filler interaction, the extent of which is greater in the case of the oxidized grade of the carbon black. It has been observed that ENR is bonded to the filler surface through the formation of primary bonds, such as ester and phenolic ether. An extensive filler–filler network formation takes place through the hydrogen bonding between the active groups of the rubber and filler surface. © 1998 John Wiley & Sons, Inc. J. Appl. Polym. Sci. 70: 723–730, 1998 相似文献