苯乙烯-异戊二烯-丁二烯三元共聚集成橡胶合成与应用进展

苯乙烯-异戊二烯-丁二烯三元共聚集成橡胶SIBR是一种高性能绿色橡胶。介绍了集成橡胶的概念和结构,详细论述了SIBR的合成方法,包括阴离子聚合、配位聚合和自由基乳液聚合,并对其应用进行了简要总结。最后,展望了SIBR合成和应用的未来发展。     

集成橡胶SIBR的合成进展

集成橡胶 SIBR(苯乙烯 -异戊二烯 -丁二烯橡胶 )是一种综合性能极佳的新型胎面橡胶 ,文中在分析了大量国外专利的基础上 ,对其合成方法进行了综述 ,同时也对集成橡胶的概念和 SIBR的国内外研究现状进行了介绍     

配位聚合制备苯乙烯-异戊二烯-丁二烯三元集成橡胶研究进展

介绍了集成橡胶(SIBR)的概念,详细总结了SIBR的配位聚合制备方法,包括限制几何构型配合物催化配位聚合、钕系催化剂催化配位聚合和链穿梭聚合。展望配位聚合制备SIBR未来的趋势。     

集成SIBR的合成进展

集成橡胶SIBR（苯乙烯－异戊二烯－丁二烯橡胶）是一种综合性能极佳的新型胎面橡胶,文中在分析了大量国外专利的基础上,对其合成方法进行了综述,同时也对集成橡胶的概念和SIBR的国内外研究现状进行了介绍。     

苯乙烯-异戊二烯-丁二烯集成橡胶制备技术及应用

介绍了苯乙烯-异戊二烯-丁二烯集成橡胶的阴离子聚合、自由基聚合、配位聚合制备技术的研究进展.在橡胶轮胎胎面胶的应用中,集成橡胶集成了各种橡胶的优点而弥补了各种橡胶的不足,兼有低滚动阻力和高抗湿滑性与耐磨性的特点,同时集成橡胶也可以作为ABS树脂增韧剂,得到具有高抗冲击强度的ABS树脂.     

基于稀土催化在苯乙烯中合成苯乙烯/异戊二烯/丁二烯三元共聚物

采用钕系稀土催化剂Nd(P204)3/Al(i-Bu)2H/CHCl3,以苯乙烯为溶剂兼做单体,进行苯乙烯(St)/异戊二烯(Ip)/丁二烯(Bd)三元共聚合反应,制备St/Ip/Bd三元集成橡胶(SIBR)。研究了经Ip、Bd陈化的催化剂对聚合活性的影响,重点考察了催化剂各组成用量对共聚合的影响。结果表明,催化剂中只有加入Ip或Bd陈化后才具有聚合活性;随着[Al]、[Cl]、[Nd]用量的增加,SIBR中St组分含量逐渐升高并在一定范围内可实现调控;[Cl]用量变化对SIBR高立体选择性和相对分子质量控制稳定性最好,其Ip、Bd组分1,4-结构含量均在98%以上,重均相对分子质量均控制在2×105左右;[Al]、[Nd]用量增加,SIBR相对分子质量下降、相对分子质量分布变窄;SIBR只有1个Tg,且随着St和Ip组分含量增加而升高;合成了Ip、Bd组分1,4-结构高立体选择性(95%)的无规SIBR。     

再生钢纤维增韧超高性能混凝土的力学性能

采用来自于废旧轮胎的两种再生钢纤维制备含粗骨料的超高性能混凝土,并测定其抗压强度、劈裂抗拉强度、断裂能和静弹性模量等力学性能,空白组及普通钢纤维增韧超高性能混凝土作对比性能试验。结果显示,未附着橡胶颗粒的再生钢纤维使超高性能混凝土的抗压强度略微下降,降低幅度为3.91%,其余各类型钢纤维均有利于提高超高性能混凝土的力学性能;而附着橡胶颗粒的再生钢纤维显著提高了超高性能混凝土的断裂能,约为普通钢纤维增韧超高性能混凝土的4倍。此外,再生钢纤维对超高性能混凝土的劈裂抗拉强度和静弹性模量的提高效果均优于普通钢纤维。再生钢纤维,尤其是附着橡胶颗粒的再生钢纤维,可以作为一种增韧材料替代普通钢纤维应用到超高性能混凝土工程结构中。      

高性能轧制镁合金研究进展

随着轻量化需求的不断增加,镁合金作为最轻的结构金属材料受到了广泛关注。商用镁合金的强度与塑性仍然较低,限制了其在各领域的广泛应用,深入研究高性能镁合金板材制备工艺是打破其应用限制的关键所在。目前,轧制是生产高性能镁合金板材的重要手段,短流程、高效率、低成本的镁合金板材轧制工艺研发是国内外研究的焦点。综述了近几年先进轧制技术（如衬板控轧、非对称轧制、交叉轧制、叠轧、电脉冲辅助轧制及铸轧等）在制备高性能镁合金板材上的最新进展,浅析了几种新型轧制方法在工业应用方面的局限性,提出了未来高性能镁合金板材的研发需基于对工艺-组织-性能关系的深入探索,从新型低合金化体系开发和低成本短流程制备工艺两方面探索优化,为进一步满足镁合金工业应用需求提供思路。     

蒙脱土/橡胶纳米复合材料的制备、结构及性能

采用插层复合法制备的蒙脱土／橡胶纳米复合材料显示出了优异的综合性能。蒙脱土有望成为新一代橡胶补强材料。本文对蒙脱土／橡胶纳米复合材料的制备方法、结构及性能进行了总结及评述，并展望了其在橡胶工业中的应用前景。     

欧盟启动“洞察力”项目开发互补金属氧化物半导体技术

正未来的雷达成像系统和5G通信系统在高频率工作时将具有更高的分辨率和更高的数据传输速率,但同时会增加功率消耗。为了降低功耗,提高性能和降低成本,欧洲启动"洞察力"(INSIGHT)项目(下一代高性能CMOS SoC技术的Ⅲ -Ⅴ族半导体纳米线集成)旨在开发Ⅲ -Ⅴ族CMOS(互补金属氧化物半导体)技术。该项目的参研单位包括德国应用固体物理研究所(IAF)、     

SnLi引发苯乙烯/异戊二烯/丁二烯聚合动力学

以含锡有机锂(SnLi)为引发剂,四氢呋喃(THF)为结构调节剂,环己烷为溶剂,对苯乙烯(St)、异戊二烯(Ip)和丁二烯(Bd)进行阴离子聚合,合成了锡官能化St-Ip-Bd三元共聚物(SIBR),研究了不同THF/SnLi(摩尔比)和引发温度下的聚合动力学。结果表明,在三元共聚合中,三种单体的反应速率与其各自浓度均符合一级动力学关系;随着引发温度的升高和THF/SnLi的增大,各单体的反应速率常数逐渐增大;当THF/SnLi为30时,单体BdI、p、St的表观增长反应活化能分别为68.486 kJ/mol,87.984 kJ/mol,76.351 kJ/mol,链增长频率因子分别为2.86×1010min-1,1.47×1013min-1,3.40×1011min-1。     

加成型液体硅橡胶体系用催化剂的研究进展

新型催化剂的开发与制备是加成型液体硅橡胶体系的关键技术之一。简单介绍了液体硅橡胶体系的应用,从硅氢加成反应用催化剂和抑制剂的种类以及催化机理方面综述了硅氢加成反应用催化剂的研究进展,展望了硅氢加成反应用催化剂和抑制剂的发展趋势。     

Research progress of p-type Fe-based skutterudite thermoelectric materials

Filled skutterudite is currently one of the most promising intermediate-temperature thermoelectric (TE) materials, having good thermoelectric transport performance and excellent mechanical properties. For the preparation of high-efficiency filled skutterudite TE devices, it is important to have p- and n-type filled skutterudite TE materials with matching performance. However, the current TE properties of p-type Fe-based filled skutterudite materials are worse than n-type filled skutterudite materials. Therefore, how to obtain high-performance p-type Fe-based filled skutterudite materials is the key to preparation of high-efficiency skutterudite-based TE devices. This review summarizes some methods for optimizing the thermal transport performance of p-type filled skutterudite materials at the atomic-molecular and nano-mesoscopic scale that have been used in recent years. These methods include doping, multi-atom filling, and use of low-dimensional structure and of nanocomposite. In addition, the synergistic optimization methods of the electrical and thermal transport parameters and advanced preparation technologies of p-type filled skutterudite materials in recent years are also briefly summarized. These optimizational methods and advanced preparation technologies can significantly improve the TE properties of p-type Fe-based filled skutterudite materials.     

Meniscus-Guided Deposition of Organic Semiconductor Thin Films: Materials,Mechanism, and Application in Organic Field-Effect Transistors

Solution-processable organic semiconductors are one of the promising materials for the next generation of organic electronic products, which call for high-performance materials and mature processing technologies. Among many solution processing methods, meniscus-guided coating (MGC) techniques have the advantages of large-area, low-cost, adjustable film aggregation, and good compatibility with the roll-to-roll process, showing good research results in the preparation of high-performance organic field-effect transistors. In this review, the types of MGC techniques are first listed and the relevant mechanisms (wetting mechanism, fluid mechanism, and deposition mechanism) are introduced. The MGC processes are focused and the effect of the key coating parameters on the thin film morphology and performance with examples is illustrated. Then, the performance of transistors based on small molecule semiconductors and polymer semiconductor thin films prepared by various MGC techniques is summarized. In the third section, various recent thin film morphology control strategies combined with the MGCs are introduced. Finally, the advanced progress of large-area transistor arrays and the challenges for roll-to-roll processes are presented using MGCs. Nowadays, the application of MGCs is still in the exploration stage, its mechanism is still unclear, and the precise control of film deposition still needs experience accumulation.     

液聚合合成橡胶节能技术和节能型橡胶的开发

总结了燕山石化溶液聚合合成橡胶节能技术和节能型橡胶的开发情况。通过改进催化体系,提高反应速度,提高反应器的生产能力,并在聚合反应器中采用带刮刀的搅拌器,同时改进聚合、凝聚、溶剂回收的部分工艺及设备,燕山石化顺丁橡胶的能耗不断下降,达到世界先进水平。溶液聚合合成橡胶凝聚过程热泵技术的工业化,使生产每吨胶可节约1MPa的低压蒸汽0.72t。橡胶溶液直接脱挥,聚丁二烯橡胶气相聚合工艺技术开发,溶聚丁苯橡胶（SSBR）、中乙烯基聚丁二烯橡胶、苯乙烯-异戊二烯-丁二烯橡胶（SIBR）、苯乙烯-丁二烯热塑性弹性体（SBS）等新型节能型合成橡胶的技术开发也在进行中,其中SSBR、SBS技术已经工业化。     

The effect of crumb rubber modifier on the resistance of asphalt mixes to plastic deformation

This research analyzed the response of bituminous mixes manufactured with rubber to plastic deformation. For this purpose, a set of asphalt mixes containing different percentages of crumb rubber modifier (CRM) added by the dry process as well as the wet process were tested. It also compared the performance of a CRM mix to that of a mix made with high-performance polymer-modified bitumen. The mixes were assessed with the wheel-tracking test and the cyclic triaxial test. Their bearing capacity was also evaluated by determining their stiffness modulus at different temperatures. The results obtained showed that for the dosages and percentages of crumb rubber used, the addition of wet-process and dry-process CRM to asphalt mixes with conventional bitumen increased their resistance to plastic deformation. In fact, the performance of some CRM mixes was superior to that of the mix with high-performance modified bitumen. It also increased their stiffness modulus and creep modulus values and improved their resistance to plastic deformations caused by vehicle traffic loads.     

不同类型多孔结构生物材料支架制备及其性能优化

多孔支架是组织工程应用中的关键环节,类似细胞外基质的作用,支撑细胞的粘附和随后细胞向组织的衍化。虽然目前已采用多种制备技术研发出大量的多孔支架,但是多孔生物材料支架的制备和性能优化,仍然是组织工程支架领域的研究热点。结合实验室工作,综述了多种制备不同类型多孔结构生物材料支架的制备技术,主要包括颗粒和纤维堆积型支架、泡沫浸渍法支架和颗粒制孔支架等的制备技术,并阐述了这些制备技术对多孔结构支架的孔结构、贯通性和力学性能的改善效果。其目的旨在提供满足组织工程需求的多孔生物材料支架。     

Further investigation of the effect of application parameters on adhesive-bonded seams of single-ply roof membranes

A laboratory study was conducted to determine if a T-peel test was sensitive to differences in initial (7 days) bond strength for adhesive-bonded seams of EPDM (ethylene propylene diene terpolymer) rubber membranes made under different application conditions. The main categories of application parameters investigated were: surface condition (cleanness, moisture) of the rubber; pressure applied; temperature during seam formation; open time. The T-peel test was found to be sensitive to changes in bond resulting from variation of some of the application parameters. Seams prepared using uncleaned sheets (without removing the talc or other contaminants from their surfaces), or using long open times, had lower average peel strengths than those of the control specimens. Light pressure or high temperature during bond formation produced seams with average peel strengths higher than those of the controls. Wet surfaces and low temperature had no significant effect on the average strength of the seams. The result that uncleaned surfaces had reduced T-peel strength was significant in that lack of proper surface preparation has been cited as a major factor affecting seam performance in service. This result suggested that the T-peel test offers promise for use in developing a quality assurance methodology to assess whether field-prepared seams are made in accordance with acceptable practice.