酚醛环氧／双酚A二（二苯基）磷酸酯／有机蒙脱土阻燃ABS Ⅲ．冲击改性剂对阻燃ABS性能的影响

选用SBS和ABS高胶粉对酚醛环氧树脂（NE）、NE／有机蒙脱土（OMMT）纳米复合物与双酚A二（二苯基）磷酸酯（BDP）以及硅烷偶联剂和硼酸锌（ZB）复配制备的无卤阻燃ABS进行增韧改性。发现ABS高胶粉增韧效果比SBS好，冲击断面呈现韧性断裂，且对氧指数和拉伸强度影响较小。     

SIS/SBS/PP共混改性的研究

研究了新型聚丙烯(PP)合金材料的配方、制备、工艺及性能。分别讨论了不同用量的三元乙丙橡胶 (EPDM)、苯乙烯与异戊二烯嵌段共聚物(SIS)及苯乙烯与丁二烯嵌段共聚物(SBS)与PP组成的二元和三元共混体系对材料力学性能的影响。结果表明:SIS为PP较好的增韧剂,PP／SIS/SBS三元共混体系具有较好的协同效应,在某种程度上可以代替EPDM改性PP,共混改性后拉伸强度、扯断伸长率等性能优良。     

Sound attenuation in composite friction materials containing thermoplastic elastomers

Attempts have been made for the first time to modify and improve the sound attenuation ability of a friction material by the inclusion of combined plastic/rubber properties of thermoplastic elastomers (TPE) as viscoelastic polymeric materials, into the formulation. To evaluate the attenuation coefficient (α) and also the real part wave number (k′) for the friction material, the viscoelastic parameters such as loss factor (tan δ) and elastic modulus (E′) were measured by the use of dynamic mechanical analyzer (DMA). Styrene‐butadiene‐styrene (SBS), styrene‐ethylene‐butylene‐styrene (SEBS) and nitrile rubber/polyvinyl chloride (NBR/PVC) blend system were used as TPE materials. However, SEBS and NBR/PVC were found to be much more effective in reducing the sound propagating speed as well as the sound level. All the friction materials containing TPEs exhibited more sound damping behavior at a wide range of temperature compared with the reference sample. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 101: 2187–2194, 2006     

Blends of poly(2,6-dimethyl-1,4-phenylene oxide) (PPO) with polystyrene-based thermoplastic rubbers: A comparative study

This work presents the first part of our study on the modification of poly(2,6-dimethyl-1,4-phenylene oxide) (PPO) with styrenic thermoplastic rubbers. Polystyrene-b-polyisobutylene-b-polystyrene (SIBS), polystyrene-b-polybutadiene-b-polystyrene (SBS) and polystyrene-b-poly(ethylene/butylene)-b-polystyrene (SEBS) triblock copolymers were melt blended with PPO and the blends were characterized. Differential scanning calorimetry (DSC), dynamic mechanical thermal analysis (DMTA) and transmission electron microscopic (TEM) studies revealed that PPO/SEBS blends displayed the most pronounced phase-separated morphology with largest rubbery domains. SBS showed the most miscibility, and the least detrimental effect on dynamic mechanical properties and tensile strength. The results of this comparative study guided us to develop optimum conditions for the impact modification of PPO by SIBS thermoplastic rubbers.     

Molecular Characterization of Styrene-Butadiene-Styrene Block Copolymers (SBS) by GPC, NMR, and FTIR

Summary This paper deals with the characterization of styrene-butadiene-styrene (SBS) block copolymers at molecular level through different techniques. SBS molecular weight distributions (MWD) were measured by Gel Permeation chromatography (GPC) in tetrahydrofuran (THF) solvent and using a calibration curve based on mono-dispersed polystyrene standards; afterwards, the relative molecular weights obtained by GPC were adjusted using a correction factor based on Mark-Houwink-Sakurada parameters for SBS in THF. Quantitative characterization of polybutadiene (PB) structures in SBS was made by solid-state ¹³C Nuclear Magnetic Resonance (NMR). A novel method using Fourier transform infrared spectroscopy (FTIR) has been developed for characterizing the SBS composition. This method covers the determination of composition in SBS ranging from 20 to 75 wt% of polybutadiene (PB) and was performed based on a FTIR calibration curve, which was prepared using mixtures of polystyrene (PS) and polybutadiene (PB) of known compositions.     

改性SBS鞋用胶粘剂的研制

研究了苯乙烯 丁二烯 苯乙烯与甲基丙烯酸甲酯、氯丁橡胶、甲基丙烯酸丁酯四元接枝共聚反应 ,讨论了反应温度、反应时间等对胶粘剂性能的影响 ,并制得了性能优良、使用方便的鞋用粘合剂     

Graph-based solution for performance evaluation of shuttle-based storage and retrieval system

The aim of this study is to provide a graph-based solution for performance evaluation of a new autonomous vehicle-based storage and retrieval system, shuttle-based storage and retrieval system (SBS/RS), under various design concepts. By the graph-based solution, it is aimed the decision-maker (i.e. warehouse manager) evaluates a pre-defined system’s performance promptly and decides on the correct design concept based on his/her requirements from thousands of alternative design scenarios of SBS/RS. The design concepts include number of bays (NoB), aisles (NoA) and tiers (NoT) for the rack design and arrival rate of storage/retrieval (S/R) transactions to an aisle of the warehouse (AR). The performance of the system is evaluated in terms of average utilisation of lifts and average cycle time of S/R transactions. Simulation is utilised for the modelling purpose. Seven NoT, seven NoB and six AR scenarios are considered in the experiments. Hence, 294 experiments are completed to obtain the graphs. By this study, to the best of our knowledge it is the first time a graph-based solution including comprehensive design concepts of SBS/RS is presented.     

SBS改性沥青生产工艺参数的考察

工艺参数是沥青改性过程中的关键因素,在SBS改性沥青的生产中,工艺参数对成品的延度、软化点、针入度以及溶解度等指标有着决定性的作用。以北方沥青厂生产的70 # 沥青为基质沥青,以SBS为改性剂,考察了剪切时间、剪切温度、剪切速率对SBS改性道路沥青的性能(包括感温性、高温稳定性及低温抗裂性能等)的影响。结果表明,以70 # 沥青为基质沥青研制的SBS改性沥青,剪切温度为180℃,剪切时间为2h ,剪切机速率为80 0 0r/min时,改性剂与基质沥青之间具有较好的相容性,改性沥青具有较高的储存稳定性和良好的路用性能。     

SBS改性沥青相态结构的参数化表征方法

聚合物改性沥青是典型的两相共混物,相态结构分析是研究其改性机理和改性效果最直接、最有效的方法。为参数化表征SBS改性沥青的相态结构,通过荧光显微系统对沥青观测样本进行图像采集,运用专业软件对荧光显微图像进行预处理并提取聚合物相显微形态参数,对4种典型的显微形态参数长短轴之比最大值、面积百分率、分形维数、最大面积代表值进行量化分析。结果表明:最大面积代表值较其他参数更适合表征SBS改性沥青的相态结构。当聚合物最大面积代表值小于2500μm2时,改性沥青一般形成沥青相连续而聚合物相分散结构;当最大面积代表值大于15000μm2时,一般形成聚合物相连续而沥青相分散结构,即网络结构。荧光显微分析为SBS改性沥青相态结构的参数化表征提供了技术手段。     

浅谈SBS改性沥青配合比设计及施工技术

阐述了SBS改性沥青的良好性能,并对SBS沥青混合料的配合比设计过程进行了介绍,论述了SBS沥青混合料的施工要点,最后对其质量控制方法进行了介绍,以提高SBS改性沥青面层的施工质量。