丁苯橡胶/聚乳酸共混可降解橡胶的制备及其性能研究

本文通过丁苯橡胶(SBR)与聚乳酸(PLA)熔融共混制备了具有可降解性的SBR/PLA共混橡胶,采用X射线衍射(XRD)与扫描电子显微镜(SEM)对水解前后的SBR/PLA共混橡胶晶体结构与微观形貌进行了表征;研究了SBR与PLA共混比例对SBR/PLA共混橡胶硫化特性、力学性能和降解性能的影响。结果表明:PLA颗粒能较为均匀地分散在SBR基体中,碱性条件下SBR/PLA共混橡胶具有一定的可降解特性。PLA的加入能提高SBR/PLA共混橡胶的降解度,当PLA含量为30 g时,SBR/PLA共混橡胶的力学性能较好,降解程度可达到17.16%。     

橡胶粒子粒径对ABS树脂结构与性能的影响

采用乳液技术在聚丁二烯(PB)和丁苯橡胶(SBR)乳胶粒子上接枝共聚苯乙烯和丙烯腈合成了PB质量分数为60％的ABS接枝粉料,将其与苯乙烯-丙烯腈共聚物(SAN树脂)熔融共混获得了一系列不同组成和结构的丙烯腈-丁二烯-苯乙烯共聚物(ABS树脂),研究了橡胶粒子粒径对ABS树脂的形态结构、力学性能的影响.结果表明,PB和SBR橡胶粒子的粒径分别为0.3μm和0.05 μm左右时,橡胶粒子的粒径对ABS树脂力学性能的影响十分显著.单独采用小拉径SBR橡胶粒子不能有效地增韧SAN树脂,而大粒径PB橡胶粒子对SAN树脂具有良好的增韧效果.     

端基改性杂臂星形溶聚丁苯橡胶的合成(英文)

以1,1-二苯基己基锂(DPHL)为引发剂,SnCl4为偶联剂,采用2种聚合工艺(工艺Ⅰ和Ⅱ)合成端基改性杂臂星形溶聚丁苯橡胶[PB-Sn-(SBR)n,其中PB指聚丁二烯,SBR指丁苯橡胶]。工艺Ⅰ将PB、SBR活性聚合物按1∶3(摩尔比)充分混合后,加入SnCl4偶联得到产物A;工艺Ⅱ先将PB活性聚合物与SnCl4 1∶1(摩尔比)反应得到PB-SnCl3后,PB-SnCl3再与SBR活性聚合物以1∶3(摩尔比)偶联得到产物B。结果表明,与工艺Ⅰ相比,采用工艺Ⅱ,有更多的PB进入偶联分子。与PB(由n-BuLi引发)/星形溶聚丁苯橡胶共混胶相比,产物A的拉伸强度较低,撕裂强度、磨耗性能有显著改善,滚动阻力略高,抗湿滑性大幅提高;产物B力学性能全面优于共混胶,有更好的抗湿滑性和低的滚动阻力。     

橡胶油对合成橡胶性能的影响

概述橡胶油在丁苯橡胶(SBR)、聚丁二烯橡胶和苯乙烯-丁二烯-苯乙烯热塑性弹性体(SBS)中的应用.分别介绍了SBR、聚丁二烯橡胶和SBS企业在选择橡胶油时的注意事项,并分析了以环保型油品替换高芳烃油时合成橡胶性能的变化趋势,指出油品密度及油品与合成橡胶的相容性是影响合成橡胶性能的重要因素.     

SBR/共沉型聚丁二烯并用胶性能研究

研究了SBR/共沉型聚丁二烯橡胶并用胶的性能.试验结果表明,随共沉型聚丁二烯橡胶用量的增大,SBR/共沉型聚丁二烯橡胶并用胶焦烧时间缩短,正硫化时间延长;与SBR,SBR/BR9000并用胶及SBR/BR9100并用胶相比,SBR/共沉型聚丁二烯橡胶并用胶的生热低,耐磨性稍差,其它性能相差不大.     

集成橡胶SBR-IR-SBR和SBR-BR-SBR的玻璃化转变温度

考察了调制式差示扫描量热仪的实验影响因素及其对嵌段(丁苯共聚物-聚异戊二烯)集成橡胶(SBR—IR—SBR)和嵌段(丁苯共聚物-聚丁二烯)集成橡胶(SBR—BR—SBR)玻璃化转变温度的影响,并研究了SBR—IR—SBR和SBR—BR—SBR的动态黏弹性能。结果表明,SBR—IR—SBR和SBR—BR—SBR的玻璃化转变温度随着调制式差示扫描量热仪升温速率的增加而增加;SBR—IR—SBR和SBR—BR—SBR中均存在着明显的相分离结构;硫化后的SBR—IR—SBR更易于相分离。     

CM/SBR共混比对共混胶性能的影响

研究了氯化聚乙烯橡胶(CM)/丁苯橡胶(SBR)共混比对其共混胶硫化特性、力学性能、耐热老化性能和耐油性能的影响。结果表明,随着CM用量的增大,共混胶正硫化时间延长,耐热老化性能和耐油性能均升高;当CM/SBR共混比为40/60时,共混胶具有较好综合力学性能。     

纳米SiO2改性NR/SBR共混胶的结构与性能研究

研究了纳米SiO2加入方式及用量对NR/SBR共混胶的正硫化时间、力学性能的影响,并研究了纳米SiO2改性前后共混胶的耐热分解性能、耐热空气老化性能及微观形态结构.结果表明:纳米SiO2的加入对共混胶的正硫化时间、力学性能及耐热稳定性能有较大影响;当纳米SiO2加入量为7％(质量分数)并采用NR/SBR共混均匀后先加入纳米SiO2,再加入小料、硫磺的方式制备NR/SBR共混胶时,纳米SiO2通过使NR/SBR共混胶的分散相细化并使共混胶的整体交联密度提高,有效地提高了NR/SBR共混胶的综合力学性能和耐热稳定性能,达到了对NR/SBR共混胶良好的补强改性效果.     

TPI/HVBR/SBR共混物的性能

对高反式－1，4－聚异戊二烯（TPI）／高乙烯基聚丁二烯橡胶（HVBR）／SBR共混物的综合物理性能和动态力学性能进行研究。结果表明，共混物中TPI／HVBR／SBR并用比为10／20／70时，共混物具有较低的滚动阻力和动态生热及优异的耐屈挠疲劳性和耐磨性，与TPI／SBR（并用比为30／70）比较，其抗湿滑性提高（0℃时的tanδ值增大76．3％）。在SBR用量为70－50份，TPI用量为15－25份和HVBR用量为15－35份范围内，共混物具有良好的综合性能，滚动阻力和抗湿滑性获得平衡，同时具有优异的耐磨性和耐屈挠疲劳性，是高性能胎面胶料的较理想配合。     

硅橡胶/丁苯橡胶并用胶的制备及表征

针对硅橡胶具有较高的耐热性,但力学性能差;丁苯橡胶(SBR)力学性能较好,但粘性较差;提出了将硅橡胶与SBR共混,制成共混材料;采用偏光显微镜、傅里叶变换红外光谱、差示扫描量热仪以及力学性能、热老化性能测试手段,研究了甲基乙烯基硅橡胶(MVQ)/SBR共混体系的并用比(质量比)、硫化工艺参数以及顺丁橡胶(BR)的加入对力学性能、耐热老化性能和相容性的影响。结果表明:MVQ与SBR最佳配比为30/70,白炭黑为45份;最佳硫化工艺参数为170℃×10 MPa×30 min。MVQ/SBR并用胶的玻璃化温度为-20℃,MVQ和SBR具有较好的相容性。     

Fly‐ash particles and precipitated silica as fillers in rubbers. II. Effects of silica content and Si69‐treatment in natural rubber/styrene–butadiene rubber vulcanizates

This article explored the possibility of using silica from fly‐ash particles as reinforcement in natural rubber/styrene–butadiene rubber (NR/SBR) vulcanizates. For a given silica content, the NR : SBR blend ratio of 1 : 1 (or 50 : 50 phr) exhibited the optimum mechanical properties for fly‐ash filled NR/SBR blend system. When using untreated silica from fly‐ash, the cure time and mechanical properties of the NR/SBR vulcanizates decreased with increasing silica content. The improvement of the mechanical properties was achieved by addition of Si69, the recommended dosage being 2.0 wt % of silica content. The optimum tensile strength of the silica filled NR/SBR vulcanizates was peaked at 10–20 phr silica contents. Most mechanical properties increased with thermal ageing. The addition of silica from fly‐ash in the NR/SBR vulcanizates was found to improve the elastic behavior, including compression set and resilience, as compared with that of commercial precipitated silica. Taking mechanical properties into account, the recommended dosage for the silica (FASi) content was 20 phr. For more effective reinforcement, the silica from fly‐ash particles had to be chemically treated with 2.0 wt % Si69. It was convincing that silica from fly‐ash particles could be used to replace commercial silica as reinforcement in NR/SBR vulcanizates for cost‐saving and environment benefits. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci, 2007     

炭黑与白炭黑补强溶聚丁苯橡胶和乳聚丁苯橡胶胎面胶性能的对比研究

对比研究采用相同体积分数的炭黑和白炭黑分别补强溶聚丁苯橡胶(SSBR)和乳聚丁苯橡胶(ESBR)胎面胶的性能。试验结果表明:与炭黑填充丁苯橡胶(SBR)胶料相比,经偶联剂Si69(用量为白炭黑用量的8%)热处理的白炭黑填充SBR胶料的分散性改善,硫化胶的300%定伸应力增大,拉断伸长率减小,抗湿滑性能提高,滚动阻力和动态生热降低,耐磨性能和抗切割性能较差。     

Dielectric properties of styrene — butadiene rubber/silica mixtures

Rice husk ash (RHA) obtained from rice mill and hydrated silica from RHA were used as a filler in vulcanized SBR 1502 and the dielectric properties were measured at a frequency of 1592 Hz at room temperature. The optimum hydrated silica content giving a good dielectric constant and conductivity was 125 parts/100 parts rubber and the dielectric loss was also high so that it could be a good insulater. There was no significant change in dielectric constant, dielectric loss and conductivity of SBR 1502 filled with RHA which could be used as high frequency dielectric due to low dielectric loss.     

改性微晶纤维素的制备及其对填充丁苯橡胶性能的影响II 改性棉纤维素对填充丁苯橡胶性能的影响

研究了微晶纤维素(MCC)和改性微晶纤维素(MMCC)的用量对丁苯橡胶(SBR)硫化胶物理机械性能的影响,以及分别填充20phrMCC和MMCC的SBR复合材料的耐磨性和动态力学性能分析。结果表明,当MCC和MMCC的用量都为20phr时,硫化胶有最大的拉伸强度,分别为15.3MPa和19.0MPa;填充MMCC的SBR复合材料的磨耗体积比填充MCC的降低了41%;填充20phr的MCC和MMCC的SBR具有相似的玻璃化温度。     

莫来石与沉淀法白炭黑填充丁苯橡胶复合材料的性能比较

在双辊开炼机中将未处理或用质量分数为3%的硅烷偶联剂A-189处理的莫来石粉体加入到丁苯橡胶(SBR)中制成复合材料.研究莫来石的加入量对SBR性能的影响,并与沉淀法白炭黑填充的SBR的性能进行了比较.结果表明,莫来石粉体对SBR表现出半增强特性;与沉淀法白炭黑填充的SBR相比,SBR/莫来石复合材料表现出良好的硫化特...     

改性膨润土在丁苯橡胶中的应用

改性膨润土吸附有机物后，晶胞中的部分基团发生了变化，但蒙脱石的晶胞形状没有改变。随着丁苯橡胶中改性膨润土粒径的减小，丁苯橡胶硫化胶的拉伸强度、扯断伸长率、３００％定伸应力、撕裂强度都有所增加，硬度下降。其填充效果比碳酸钙的效果好。     

Properties of styrene butadiene rubber (SBR)/recycled acrylonitrile butadiene rubber (NBRr) blends: The effects of carbon black/silica (CB/Sil) hybrid filler and silane coupling agent,Si69

The recycling or reuse of waste rubber by means of blending together with polymeric materials in addition of filler such as hybrid carbon black and silica (CB/Sil) to a polymer system can provides an opportunity to explore alternative product specifications. Therefore, in this work the investigation of recycled rubber blends based on styrene butadiene rubber/recycled acrylonitrile butadiene rubber (SBR/NBRr) blends reinforced with 50/0, 40/10, 30/20, 20/30, 40/10, 0/50 phr of carbon black/silica (CB/Sil) hybrid filler treated with and without silane coupling agent (Si69) were determined. Cure characteristics, tensile properties, and morphological behavior of selected SBR/NBRr blends at a fix 85/15 blend ratio were evaluated. Results showed that, cure time t₉₀, minimum torque (M_L), and maximum torque (M_H) of CB/Sil hybrid fillers filled SBR/NBRr blends with and without Si69 increased as silica content increased. However, t₉₀ and M_L of SBR/NBRr blends with Si69 were lower than without Si69 except for (M_H). The optimum scorch time (t_s2) of SBR/NBRr blends with and without Si69 was obtained at 30/20 phr of CB/Sil hybrid filler. However, t_s2 of SBR/NBRr blends with Si69 were longer than SBR/NBRr blends without Si69. The incorporation of Si69 has improved the tensile properties [(tensile strength, elongation at break (E_b), stress at 100% elongation (M100), and stress at 300% elongation (M300)] of CB/Sil hybrid fillers filled SBR/NBRr blends. These properties were influenced by the degree of crosslinked density as the silica content is increased. Scanning electron microscopy (SEM) of the tensile fracture surfaces indicated that, with the addition of Si69 improved the dispersion of hybrid fillers and NBRr in SBR/NBRr matrix. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2012     

硼铝骨架改性中孔分子筛的合成与表征

以正硅酸乙酯（TEOS）为硅源,以十六烷基三甲基溴化铵（CTABr)为结构模板剂,在碱必条件下采用水热晶化法成功合成了B－Al骨架改性的中孔分子筛MCM－41。通过XRD、TG－DTG、IR、N2等温物理吸附等多种表征手段对其进行结构、性质分析;发现B有助于Al进入Si-MCM-41中孔分子筛的无机骨架中,B－Al-MCM-41比Al-MCM-41的晶体完整性好;同时掺入B、Al后的中孔结构分子筛与全硅MCM－41中孔分子筛相比,无机墙表面基团的性质不同,比表面积稍小,最可几孔径稍大,孔径分布较宽;Al,B同晶取代Si进入MCM－41无机骨架人会使其中孔结构发生一些变化,因而合成的B－Al-MCM-41必将有不同的催化、吸附性能。     

甲基丙烯酸对氢氧化铝填充丁苯橡胶性能的影响

将甲基丙烯酸（MAA）用作Al(OH）3填充丁苯橡胶（SBR）复合材料的添加剂，结果表明，在高填充Al(OH）3的SBR中加入MAA可以较大幅度地提高其过氧化物硫化胶的力学性能。当Al(OH）3用量为150份（质量份，下同）时，随着MAA用量增加，SBR硫化胶的邵尔A型硬度和定伸应力逐渐增大，拉伸强度和撕裂强度有较大幅度的提高，当MAA用量为20份时，随着Al(OH）3用量增加，SBR硫化胶的邵尔A型硬度、定伸应力和撕裂强度逐渐增大，拉伸强度在Al(OH）3填充量为25份时最大，大量填充Al(OH）3的SBR硫化胶的阻燃性能较好，氧指数受MAA用量的影响较小，该SBR硫化胶亦具有良好的热空气老化性能。     

Corrosion behavior of aluminum/silica/polystyrene nanostructured hybrid flakes

The corrosion protection of aluminum flake pigments has been extended by means of an encapsulating inorganic/organic silica/polystyrene hybrid nanolayer. A silica nanolayer encapsulated the surface of aluminum flakes (Al) by hydrolysis and polycondensation of tetraethylorthosilicate via sol–gel process to yield Al/Si flakes. Then, 3-methacryloxypropyltrimethoxysilane (MPS) was used as surface modifier which has polymerizable groups to participate in polymerization reaction (Al/Si/MPS). A polystyrene (PS) coating layer was applied on Al/Si/MPS flakes by free radical polymerization of styrene initiating with Azobisisobutyronitrile at 60 °C and subsequent washing of free chains with solvent yielded Al/Si/PS flakes. Fourier transform infrared spectroscopy, energy-dispersive X-ray spectroscopy and scanning electron microscopy showed that silica and PS nanolayers were formed on the aluminum flakes. The attached PS chains on the surface were detached by hydrofluoric acid aqueous solution and analyzed by gel permeation chromatography (GPC). Also, a transmission electron microscopy image showed clearly that the encapsulating layers are in the scale of nano. Good results were obtained in terms of corrosion protection in acidic and alkaline solutions, indicating that the silica/polymer hybrid nanolayer coating acts as an efficient protective film. After encapsulating the flakes, the evolved hydrogen volume was dropped and hybrid nanolayer resulted in no evolved hydrogen volume.