新型热塑性弹性体SEBS

首先介绍了新型热塑性弹性体聚苯乙烯-乙烯-丁烯-苯乙烯(SEBS)的结构及特性;然后重点概述了SEBS的接枝共聚和共混改性,以及改性后接枝物和共混物的力学性能的变化;最后总结了SEBS作为热塑性弹性体的发展状况和广阔的应用前景。     

再生胶基热塑性弹性体的制备与性能表征

制备再生橡胶基热塑性弹性体。结果表明,以聚苯乙烯-聚乙烯-聚丁烯-聚苯乙烯（SEBS）为连续相、以再生橡胶为分散相,配方为：SEBS　70,再生橡胶　30,炭黑N330　10,氧化锌　3,硬脂酸　1,对二甲苯　0.5,防老剂4010NA　1.5,促进剂TMTD　0.5,硫黄　0.5时,再生橡胶基SEBS热塑性弹性体的综合物理性能较好。     

巴陵石化医用SEBS新材料技术填补国内空白

正中国石化巴陵石化公司输液管、输液袋用聚苯乙烯-聚乙烯-聚丁烯-聚苯乙烯(SEBS)/聚丙烯(PP)弹性体专用料的开发及应用项目通过中国石化科技部组织的技术鉴定。专家鉴定认为,该项目在深入研究阴离子聚合工艺控制技术及聚合物微观结构分布的基础上,采用独特的专利技术,开发出医用热塑性弹性体SEBS新材料,填补了国内空白,涉及的产品和技术获得6项授权中国发明     

再生橡胶基热塑性弹性体的制备

研究制备再生橡胶基热塑性弹性体。结果表明,以聚苯乙烯-乙烯-丁烯-苯乙烯(SEBS)为连续相、再生橡胶为分散相,选择配方:SEBS 70,再生橡胶30,炭黑N330 10,氧化锌3,硬脂酸1,防老剂4010NA 1.5,促进剂ZDC 0.5,促进剂TMTD 0.5,硫黄0.5,可制得综合物理性能较好的再生橡胶基SEBS热塑性弹性体。     

超细碳酸钙填充SEBS/PP热塑性弹性体的性能研究

分别采用超细重质碳酸钙(HX-6000)和超细轻质碳酸钙(306-2)作为无机填料,通过在苯乙烯-乙烯-丁烯-苯乙烯嵌段共聚物(SEBS)/聚丙烯(PP)热塑性弹性体中添加不同含量的超细碳酸钙,并对其综合性能进行系统研究,采用扫描电子显微镜、比表面仪、电子密度计、邵氏硬度计、万能力学性能实验机和熔体流动速率测试仪等表征手段对超细碳酸钙粉体的颗粒大小、微观形貌和比表面积以及SEBS/PP热塑性弹性体的300%定伸强度、密度、硬度和熔体流动速率进行了测试。结果表明,在低填充下306-2分散性比较好,制备的SEBS/PP热塑性弹性体强度较高,HX-6000在提高SEBS/PP热塑性弹性体的强度方面具有更大的优势;随着超细碳酸钙添加量的逐渐增大,SEBS/PP热塑性弹性体的密度和硬度均呈现逐渐增大的趋势,熔体流动速率呈逐渐下降趋势,HX-6000具有更高的熔体流动速率。     

黑滑石粉在SEBS/PP热塑性弹性体中的应用

表征了黑滑石粉的基本物理性能,并将其填充改性在苯乙烯-乙烯/丁烯-苯乙烯/聚丙烯(SEBS/PP)热塑性弹性体中,测试了SEBS/PP热塑性弹性体的力学性能、密度、硬度及熔融指数,并分析了黑滑石粉颗粒在SEBS/PP热塑性弹性体中的分散情况。结果表明,随着黑滑石添加量的逐渐增大,SEBS/PP热塑性弹性体的拉伸强度、断裂伸长率和熔融指数均表现出先增大后下降趋势,SEBS/PP热塑性弹性体的密度和硬度均表现出逐渐增大趋势,黑滑石粉粒径越小,SEBS/PP热塑性弹性体拉伸强度、断裂伸长率和硬度越大,熔融指数越低。     

巴陵石化年产6万t特种锂系聚合物项目全线投产

日前,中国石化巴陵石化分公司新建的年产2万t热塑性弹性体聚苯乙烯-聚乙烯-聚丁烯-聚苯乙烯嵌段共聚物(SEBS)单元装置实现一次开车成功,至此,巴陵石化年产6万t热塑性弹性体(特种锂系聚合物)项目全线贯通投产,装置运行平稳。巴陵石化年产6万t特种锂系聚合物项目是该公司"五改七建一配套"特色化工项目之一,总投资4.93亿元,采用具有自主知识产权的锂系聚     

SEBS/PP热塑性弹性体阻尼性能研究

以苯乙烯-乙烯-丁二烯-苯乙烯嵌段共聚物(SEBS)和聚丙烯(PP)为基体材料,采用HAAKE转矩流变仪制备SEBS/PP热塑性弹性体,利用动态热机械分析仪研究PP和填充油用量对SEBS/PP热塑性弹性体力学性能、动态力学性能的影响,进而通过添加萜烯树脂来研究提高热塑性弹性体阻尼性能的方法。结果表明:PP的加入改善了SEBS/PP共混体系的力学性能,但随着PP用量的增加,热塑性弹性体阻尼因子的峰值逐渐下降;SEBS/PP共混体系在添加20 phr PP时,综合性能最佳;随着萜烯树脂用量的增加,阻尼因子的峰值向高温方向移动,且有效温域(阻尼因子tanδ0.3)明显加宽;在添加50 phr萜烯树脂时,热塑性弹性体的tanδ峰值向高温移动20℃左右,且在tanδ0.3的范围内温域拓宽19℃,阻尼性能明显提高;随着填充油用量的增加,SEBS/PP热塑性弹性体的力学性能下降,tanδ峰值变大,阻尼温域变窄,充油比在1:1.1时SEBS/PP热塑性弹性体的综合阻尼效果更好。     

马来酸酐接枝SEBS的机理及应用进展

介绍了马来酸酐接枝热塑性弹性体SEBS的机理,并综述了近年来马来酸酐接枝SEBS后成为SEBS-g-MAH作为相容剂在塑料行业中的应用进展。     

苯乙烯热塑性弹性体的应用

苯乙烯热塑性弹性体(TPS)具有令人满意的功能,故其应用范围十分广阔。苯乙烯热塑性弹性体中的嵌段共聚物,加上其硬嵌段和软嵌段的性能,使其容易加工且具有优异的使用性能。文中以苯乙烯-丁二烯-苯乙烯(SBS)嵌段共聚物和苯乙烯-乙烯-丁烯-苯乙烯嵌段共聚物(SEBS)为实例,介绍热塑性弹性体具有代表性的应用情况。文中着重介绍了TPS在胶粘剂、沥青改性剂、树脂改性剂和减振领域的应用实况。     

SEBS/PP热塑性弹性体的制备与性能研究

以苯乙烯-乙烯-丁二烯-苯乙烯嵌段共聚物(SEBS)和聚丙烯(PP)为基体树脂,以碳酸钙(CaCO3)为填充材料,用氢化白油调节其硬度及加工流动性,在一定的工艺条件下添加助剂用开炼机混炼制备SEBS/PP热塑性弹性体;研究了氢化白油、CaCO3和热塑性弹性体等对SEBS/PP共混体系性能的影响。     

SEPS热塑性弹性体的催化专利进展

概述新型热塑性弹性体氢化苯乙烯-异戊二烯-苯乙烯嵌段共聚物(SEPS)的性能、用途以及市场需求,介绍国内外研究开发的催化剂动向,并分析催化剂专利申请状况,提出国内发展SEPS工业项目的必要性。国内专利申请涉及的催化剂主要有有机酸盐类、茂金属类、四烃基钛类。目前世界上占主导地位的热塑性弹性体是苯乙烯类热塑性弹性体(SBCs),产品以SBS、SIS以及相应氢化产品SEBS和SEPS等为主。     

SEBS/PP热塑性弹性体压缩永久变形性能研究李善良

通过双螺杆挤出机制备了SEBS/PP热塑性弹性体,研究了各种因素对热塑性弹性体压缩永久变形性能的影响。实验结果表明：PP含量越高,材料的压缩永久变形越大;提高SEBS或碳酸钙含量,能有效降低材料的压缩永久变形; 石蜡油能改善材料的性能,当油含量为20%时,材料的性能达到最佳;乙烯丙烯酸树脂能改善材料与碳酸钙界面结合力,降低材料的压缩永久变形。     

阻燃SEBS热塑性弹性体研究进展

苯乙烯-乙烯丁烯共聚物-苯乙烯三嵌段共聚物（SEBS）是一种性能优异的热塑性弹性体,具有广泛的发展前景,但存在易燃的缺陷,限制了其应用领域。本文综述了近年来国内外阻燃SEBS的应用研究进展,主要介绍了应用于阻燃SEBS的阻燃体系、阻燃机理和存在的问题及其解决方法。     

苯乙烯-乙烯-丁二烯-苯乙烯嵌段共聚物抗菌热塑性弹性体的制备及性能

采用电解沉积法和热还原法制备载银硅藻土(Ag/DT)抗菌剂,将其与苯乙烯-乙烯-丁二烯-苯乙烯嵌段共聚物(SEBS)熔融共混制得SEBS抗菌热塑性弹性体.结果表明,Ag/DT抗菌剂在SEBS中分散均匀,制得的SEBS抗菌材料的抗菌效果较好,并且抗菌剂的添加使SEBS的物理机械性能得到显著提高.     

PA／PP／SEBS三元合金的结构与性能

本文作者采用氢化ＳＢＳ（ＳＥＢＳ）三嵌段热塑性弹性体增韧ＰＡ／ＰＰ共混体系，应用挤出反应技术在双螺杆挤出机内就地产生相容剂，可改善体系的相容性，从而获得了超高韧性的尼龙合金，还采用ＳＥＭ和ＴＥＭ技术研究了此类体系的形态结构特征，这些形态结构为进一步研究结构与性能关系提供了丰富的资料。     

Influence of rubber particle size on mechanical properties of polypropylene–SEBS blends

Isotactic polypropylene blends with 0–20 vol % thermoplastic elastomers were prepared to study the influence of elastomer particle size on mechanical properties. Polystyrene-block-poly(ethene-co-but-1-ene)-block-polystyrene (SEBS) was used as thermoplastic elastomer. SEBS particle size, determined by means of transmission electron and atomic force microscopy, was varied by using polypropylene and SEBS of different molecular weight. With increasing polypropylene molecular weight and, consequently, melt viscosity and decreasing SEBS molecular weight, SEBS particle size decreases. Impact strength of pure polypropylene is almost independent of molecular weight, whereas impact strength of polypropylene blends increases strongly with increasing polypropylene molecular weight. The observed sharp brittle–tough transition is caused by micromechanical processes, mostly shear yielding, especially occurring below a critical interparticle distance. The interparticle distance is decreasing with decreasing SEBS particle size and increasing volume fraction. If the polypropylene matrix ligament between the SEBS particles is thinner than 0.27 μm, the blends become ductile. Stiffness and yield stress of polypropylene and polypropylene blends increase with increasing polypropylene molecular weight in the same extent, and are consequently only dependent on matrix properties and not on SEBS particle size. © 1998 John Wiley & Sons, Inc. J Appl Polym Sci 68: 1891–1901, 1998     

SEBS/PP共混材料的研究及其进展

SEBS是一种用途广泛的新型弹性体材料,在常温下具有高弹性,高温下可直接加工成型。由于SEBS具有优异的耐臭氧、耐氧化、耐紫外线和耐候性能等,因此,应用范围广于普通SBS材料。但是,SEBS耐溶剂性和耐油性较差,常通过与其他材料共混改性来增强其加工性能。文章重点概述了苯乙烯-乙烯-丁烯-苯乙烯(SEBS)与聚丙烯(PP)共混材料的微观结构、相容性以及结构与性能的研究进展,介绍了近年国内外SEBS/PP共混改性的研究成果,包括填充油、无机材料、PPO、PC和PA6等改性体系,并比较了这些改性技术对SEBS/PP共混体系微观结构及性能的影响,近年内,SEBS/PP共混材料的理论研究和工程应用会有长足发展。     

Effect of blending thermoplastic elastomer with natural rubber compound and studies of short fiber reinforced rubber composite

Rubber engineers face difficulties in scorching and vulcanizing during rubber processing, particularly of natural rubber (NR). Therefore, this work tried to solve these problems by blending thermoplastic rubber with NR compound. The results indicated that the scorch resistance of the NR was improved by blending the thermoplastic elastomer styrene–ethylene/butylene–styrene (SEBS). However, its mechanical properties were not found to be improved. Therefore, this study was extended to understand the reinforcement effects of short fiber carbon and glass fibers, on the mechanical properties of the thermoplastic elastomer with NR compounds. © 1996 John Wiley & Sons, Inc.     

Rheological behaviors of glass bead‐ and wollastonite‐filled polypropylene composites modified with thermoplastic elastomers

Steady‐ and oscillatory‐shear rheological behaviors of polypropylene/glass bead (PP/GB) and PP/wollastonite (PP/W) melts modified with thermoplastic elastomers, poly(styrene‐b‐ethylene‐co‐butylene‐b‐styrene) copolymer (SEBS) and the corresponding block copolymer grafted with maleic anhydride (SEBS‐g‐MA), were examined by means of a parallel‐plate rheometer. With adding the elastomers (SEBS and SEBS‐g‐MA) and fillers (spherical GB and acicular W) to PP, viscosity especially at low shear rates and shear‐thinning flow behavior at high shear rates were pronounced as evidenced quantitatively by Carreau–Yasuda (CY) parameters, but Cox–Merz analogy became weakened. Besides, melt‐elasticity in terminal region and relaxation time (t_c) in crossing point increased, indicating an enhancement in quasi‐solid behavior of molten PP. Comparing with the elastomers, rheological behaviors of molten PP were more influenced with adding the rigid fillers, especially with W due to distinct acicular shape of W particles. SEBS‐g‐MA elastomer more affected rheological behaviors of the ternary composites than SEBS elastomer, implying that SEBS elastomer and the filler particles behaved individually (i.e., development of separate microstructure) in (PP/GB)/SEBS and (PP/W)/SEBS ternary composites, but core‐shell microstructure developed with strong interfacial adhesion by adding SEBS‐g‐MA elastomer, and the filler particles encapsulated with the thick SEBS‐g‐MA elastomer interlayer (i.e., core‐shell particles) acted like neither big elastomer particles nor like individual rigid particles in melt‐state. Moreover, effects of SEBS‐g‐MA elastomer reached a maximum on rheological behaviors of (PP/W)/SEBS‐g‐MA ternary composite, indicating a synergy between core‐shell microstructure and acicular W particles. Correlations between oscillatory‐shear flow properties and microstructures of the blends and composites were evaluated using Cole–Cole (CC), Han–Chuang (HC), and van Gurp–Palmen (vGP) plots. COMPOS., 2012. © 2012 Society of Plastics