水溶性Kevlar纳米纤维对羧基丁腈橡胶力学性能和 动态力学性能的影响

制备了水溶性Kevlar纳米纤维(hANFs)/羧基丁腈橡胶(XNBR)复合材料,研究了hANFs的用量对橡胶的力学性能和动态力学性能的影响。结果表明,当hANFs用量为5份时,复合材料的拉伸强度和撕裂强度分别提高了203%和103%,储能模量和玻璃化转变温度也有明显提高。     

水溶性Kevlar纳米纤维对丁苯橡胶/羧基丁腈橡胶共混物的增容及补强效果（英文）

研究了水溶性Kevlar纳米纤维(m-KNFs)对丁苯橡胶/羧基丁腈橡胶共混物相容性和力学性能的影响。结果表明,m-KNFs可有效地改善共混硫化胶的相容性;当m-KNFs用量为0.3份时,共混硫化胶的拉伸强度、扯断伸长率、100%定伸应力以及撕裂强度分别提高了87.2%,17.2%,13.2%,142.6%。     

改性芳纶纳米纤维对羧基丁腈橡胶力学性能的影响

采用改性芳纶纳米纤维(m-ANFs)填充羧基丁腈橡胶(XNBR)硫化胶,研究了不同用量的m-ANFs对XNBR硫化胶的力学性能的影响。结果表明,m-ANFs较好地分散在橡胶基体中,可有效地改善XNBR硫化胶的力学性能,当m-ANFs的用量为5. 0份时,XNBR硫化胶的拉伸强度、扯断伸长率、100%定伸应力及撕裂强度分别提高了182%、42%、14%和101%。     

氧化石墨烯增容及增强羧基丁腈橡胶/丁苯橡胶共混物（英文）

制备了氧化石墨烯/羧基丁腈橡胶/丁苯橡胶共混硫化胶,研究了氧化石墨烯对硫化胶的相容性和力学性能的影响。结果表明,氧化石墨烯可有效改善共混硫化胶的相容性,当氧化石墨烯用量为0.3份(质量)时,共混硫化胶的力学性能达到最佳,100%定伸应力、300%定伸应力、拉伸强度和撕裂强度分别提高了44%、107%、71%和94%。     

粉末羧基丁腈橡胶/聚氯乙烯共混胶的研制

将羧基丁腈橡胶(XNBR)乳液与聚氯乙烯(PVC)乳液共混,然后用胶乳凝聚成粉法凝聚成粉。研究了凝聚成粉的工艺及条件,考察了XNBR/PVC配比对产品性能的影响。结果表明,在隔离剂质量分数为3%～5%、凝聚温度为50～60℃、搅拌转速为300～400r/min的条件下,可制得成粉率在95.0%以上、贮存不黏结且性能良好的不同配比的粉末XNBR/PVC共混胶。     

功能化凯夫拉纳米纤维对羧基丁腈橡胶介电性能的影响

采用功能化凯夫拉纳米纤维(m-KNFs)填充羧基丁腈橡胶(XNBR),考察了m-KNFs的用量对XNBR硫化胶介电性能的影响。结果表明,m-KNFs可有效地提高硫化胶的介电常数,当m-KNFs的用量为7份时,XNBR硫化胶的介电常数达到了25.25,同时该硫化胶具有较小的介电损耗。     

丁腈橡胶增容丁苯橡胶/聚氯乙烯共混体系

采用一系列结合丙烯腈质量分数不同的丁腈橡胶(NBR)作为丁苯橡胶(SBR)／聚氯乙烯(PVC)不相容共混物的增容剂,研究了SBR／PVC／NBR硫化胶的力学性能,并用扫描电子显微镜、傅里叶变换红外光谱仪和动态黏弹仪研究了该硫化胶的形态结构与相容性。结果表明,结合丙烯腈质量分数为20％～26％的NBR是SBR／PVC的优良增容剂,可提高共混物的力学性能,使SBR相和PVC相达到微细均匀化分散,并在两相之间形成了界面层,使得增容效果达到最佳。     

Enhancement of the mechanical and tribological properties of carboxylated acrylonitrile butadiene rubber filled with cryptocrystalline graphite by different preparation methods

As a cost-effective and environmentally friendly natural mineral, cryptocrystalline graphite (CG) is applied in rubber materials and its performance has been evaluated. In this work, the filler dispersion and mechanical and tribological properties of carboxylated acrylonitrile butadiene rubber (XNBR)/CG composites by different preparation methods were studied. XNBR/CG composites prepared by latex blending (XNBR/CG-L) exhibited better mechanical and tribological performance, higher toughness, and lower heat build-up than those prepared by mechanical blending (XNBR/CG-M). These differences were ascribed to the filler dispersion degree, filler amount and dispersed size, and also filler–rubber interfacial interaction. Adding CG was conducive to improving the stability of the friction coefficient and reduced the wear rate via the formation of graphite lubricant and transfer films. The tribological performance of XNBR/CG-L was superior to that of XNBR/CG-M because of the improved tensile strength, tear resistance, and toughness as well as lower temperature rise. Scanning electron microscopy (SEM) and optical microscope observation showed a smoother worn surface, less and smaller wear debris of XNBR/CG-L, and a more uniform transfer film on the steel counterpart surface. The relevant results provided new insight into the performance and structural design of CG/rubber composites.     

改性大豆分离蛋白对顺丁橡胶/丁苯橡胶复合材料性能的影响

将糊化改性的大豆分离蛋白( SPI)等量替代炭黑填充至顺丁橡胶/丁苯橡胶中,研究了改性SPI的粒径和热性能,考察了改性SPI用量对橡胶复合材料物理机械性能、热性能、压缩生热性能的影响,并与白炭黑和轻质碳酸钙填充复合材料进行了对比.结果表明,改性SPI的中位径由原来的115.25 μm减小至37.63 μm,比表面积由原...     

改性淀粉对炭黑填充丁苯橡胶/顺丁橡胶并用胶性能的影响

用改性淀粉替代部分炭黑填充丁苯橡胶(SBR)/顺丁橡胶(BR)并用胶,考察了改性淀粉用量及偶联剂种类对混炼胶硫化特性及硫化胶物理机械性能和动态力学性能的影响.结果表明,用改性淀粉替代部分炭黑可对SBR/BR混炼胶的硫化产生明显的延迟作用,但改性淀粉用量的变化对焦烧时间与正硫化时间影响不大;添加偶联剂KH-570或NDZ-201延迟了混炼胶的硫化过程,KH-550能大幅度地促进硫化作用,Si-69对于体系的硫化性能略有影响;随着改性淀粉用量的增加,SBR/BR硫化胶的拉伸性能、耐磨耗性均有所降低,但弹性、动态生热和滞后性能得到了明显改善,改性淀粉最佳用量为5～8份;各种偶联剂均可提高SBR/BR硫化胶的拉伸性能,硅烷偶联剂Si-69和KH-570对弹性和动态生热也略有改善,添加偶联剂KH-550改善了SBR/BR硫化胶的抗湿滑性能,但滞后性能变差,添加偶联剂KH-570或Si-69对SBR/BR硫化胶动态力学性能的影响较小,综合考虑,以添加偶联剂KH-570较好.     

部分端基硅偶联溶聚丁苯橡胶并用胶的性能

分别制备了部分端基硅偶联溶聚丁苯橡胶(SSBR)与顺丁橡胶(BR)、天然橡胶(NR)、乳聚丁苯橡胶(ESBR)的并用胶,研究了并用比(质量比)对并用胶硫化胶力学性能和动态力学性能的影响。结果表明,随SSBR含量增加,并用胶中白炭黑的分散性提高;随BR、NR、ESBR的含量增加,SSBR并用胶的力学性能得到改善;BR的加入使得SSBR并用胶的耐磨性得到改善;并用胶的抗湿滑性随SSBR含量的减少而变差;3种SSBR并用胶的滚动阻力均较低。     

Tailoring the structure of Kevlar nanofiber and its effects on the mechanical property and thermal stability of carboxylated acrylonitrile butadiene rubber

Water-dispersible hydrolyzed Kevlar nanofibers (hANFs) prepared by acid-assisted hydrothermal treatments of Kevlar nanofibers (ANFs) were first incorporated into carboxylated acrylonitrile butadiene rubber (XNBR) by a latex co-coagulation method. The obtained hANFs maintained the one-dimensional nanofibrous morphology and crystal structure as ANFs. There were amounts of polar groups appearing at the end of hANFs molecular chains after hydrothermal process, which led to the strong hydrogen bonding interaction between the filler and XNBR matrix. The results indicated that hANFs had significant reinforcement effects on the mechanical properties, crosslink density, and thermal stability of XNBR matrix. In comparison with those of neat XNBR, the tensile strength, tear strength, crosslink density, and maximum heat decomposition temperature (T_max) of XNBR/hANFs nanocomposites filled with 7 phr hANFs increased by 236%, 161%, 35%, and 19.64 °C, respectively. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 136, 47698.     

Effect of acrylonitrile content of acrylonitrile butadiene rubber on mechanical and thermal properties of dynamically vulcanized poly(lactic acid) blends

We report here the morphology, thermal and tensile properties of poly(lactic acid) (PLA) blends composed of acrylonitrile butadiene rubber (NBR) with different acrylonitrile contents with/without dynamic vulcanization by dicumyl peroxide (DCP). The interfacial tension of PLA and NBR measured by contact angle measurement decreased as the acrylonitrile content of NBR decreased. Likewise, SEM images showed that the rubber particle size reduced with decreasing acrylonitrile content owing to the stronger interfacial adhesion between the PLA matrix and NBR domains. Incorporation of DCP at 1.0 phr for dynamic vulcanization led to higher crosslink density and, in turn, optimal tensile strength and tensile toughness as a result of the action of PLA‐NBR copolymer as a reactive compatibilizer. The dynamic vulcanization of the blends containing low acrylonitrile NBR gave the most improved tensile properties because the free radicals from DCP decomposition preferentially attacked the allylic hydrogen atoms or double bonds of the butadiene backbone. Accordingly, more NBR macroradicals were generated and probably more PLA‐NBR copolymers were produced. Moreover, further addition of DCP at 2.0 phr provided a large amount of crosslinked NBR gel, which significantly degraded the tensile properties. From the DSC results, dynamic vulcanization lowered the cold crystallization temperature, implying an improvement of cold crystallization. Finally, TGA results showed a higher degradation temperature as a function of DCP content, which suggested that thermal stability increased due to stronger interfacial adhesion as well as higher gel content. © 2019 Society of Chemical Industry     

Comparison of morphology and mechanical properties of peroxide‐cured acrylonitrile butadiene rubber/LDH composites prepared from different organically modified LDHs

Rubber compounds based on acrylonitrile butadiene rubber (NBR) containing organically modified layered double hydroxides (LDHs) were prepared using peroxide as a curing agent. The LDHs intercalated by organic compounds including sodium styrene sulfonate (SSS) and sodium dodecylbenzene sulfonate (SDBS) were investigated using thermogravimetric analysis (TGA) and X‐ray diffraction (XRD) while the unmodified LDHs were used as contrast. Experimental results from TGA and XRD showed that both SSS‐ and SDBS‐intercalated LDHs were successfully obtained. The morphology of the LDH composites was characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), and XRD. The chemical structure of NBR/LDHs compounds were measured by Fourier transform infrared spectrum. The thermal properties were measured by TGA and differential scanning calorimetry. Other properties such as mechanical and swelling properties were also investigated. The results showed that a chemical bonding between organically modified LDHs and rubber matrix through SSS was built during vulcanization, which leads to improved interfacial strength of the cured compound. A high‐performance acrylonitrile butadiene rubber/SSS‐modified LDH compound, which has two times higher tensile strength than cured pure rubber without significant loss of elongation, was obtained. © 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013     

反式-1,4-聚异戊二烯的结晶性对丁苯橡胶/反式-1,4-聚异戊二烯共混硫化胶动态力学性能的影响

用动态力学分析仪和差示扫描量热仪研究了丁苯橡胶(SBR)/反式-1,4-聚异戊二烯(TPI)共混硫化胶的动态力学性能和结晶性能。结果表明,SBR与TPI的两相相容性良好。随着TPI用量的增加,SBR/TPI共混硫化胶的玻璃化转变温度向低温方向移动,且损耗因子峰值逐渐降低。用炭黑填充CV体系硫化SBR/TPI共混胶的损耗因子峰值低于相应的未填充胶料;而当TPI晶体熔融后,炭黑填充胶料的损耗因子要大于未填充者。不同硫化体系硫化SBR/TPI共混胶的损耗因子峰值和玻璃化转变温度从大到小的变化依次为CV体系、EV体系和DCP体系。     

Preparation and characterization of thermoplastic polyurethane–urea and carboxylated acrylonitrile butadiene rubber blend nanocomposites

This study deals with the preparation and characterization of novel thermoplastic polyurethane–urea (TPUU) and carboxylated acrylonitrile butadiene rubber (XNBR) blends. Blends of different compositions were prepared in tetrahydrofuran using a solution technique, following an ultra‐sonication. The chemical reaction between the two inherently immiscible blend phases was determined with the help of Fourier transform infrared‐attenuated total reflectance (FTIR‐ATR) spectroscopy and ¹H‐nuclear magnetic resonance (¹H‐NMR) spectroscopy. The identification of the new peaks in the FTIR‐ATR spectra corroborates the existence of chemical reaction between the carboxylic functional group of XNBR and the amide group of the TPUU. In addition, an increase in the network crosslink density of the blend investigated using ¹H‐NMR spectroscopy further supports the occurrence of the chemical reaction between the XNBR and the TPUU. The scanning and transmission electron micrographs of the blend morphology show a uniform dispersion of the minor TPUU phase in the XNBR. Furthermore, the existence of a single glass transition peak also confirms the enhancement in the interfacial miscibility. Additionally, the incorporation of 5 wt % of organomodified montmorillonite nanoclay improves the mechanical properties to a considerable extent in comparison with the unfilled blend elastomeric material. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2012     

Synthesis of borate ester‐grafted carboxylated acrylonitrile butadiene rubber and its use as electron acceptor to dissolve lithium perchlorate

A novel borate ester (BE)‐grafted carboxylated acrylonitrile butadiene rubber (XNBR) was synthesized. From Fourier transform infrared, ¹H NMR and elemental analyses, the borate ester was successfully grafted to XNBR, resulting in a more flexible XNBR chain as revealed by differential scanning calorimetry. The binding energies of boron, oxygen, lithium and chlorine atoms of XNBR‐g‐BE–LiClO₄ are quite different from those of XNBR or LiClO₄. Meanwhile, the wavenumbers of C? O? B? O? C, C?O and C? H vibrations of the benzene ring shift towards lower values and a new shoulder peak for ? CN at about 2260 cm^?1 emerges. By integrating fitting peak areas of ? CN groups and ClO₄^?, the fractions of ? CN group and ClO₄^? bidentate bonding in XNBR‐g‐BE–LiClO₄ are much higher than in NBR–LiClO₄. Based on these experiments, a possible dissociation mechanism is proposed in which the boron atom of XNBR‐g‐BE receives electron pairs from ClO₄^?, releasing partial positive charge of Li⁺ to bind with ? CN group. © 2016 Society of Chemical Industry