PTT/SEBS复合材料的制备及其流变性能

采用熔融共混法,将聚对苯二甲酸丙二酯（PTT）纤维与氢化苯乙烯-丁二烯-苯乙烯嵌段共聚物（SEBS）弹性体共混制备PTT/SEBS复合材料,考察了SEBS弹性体含量对复合材料力学性能的影响,以及剪切速率、温度对复合材料流变性能的影响,并分析了复合材料的亚微相态。结果表明：加入SEBS弹性体使PTT/SEBS复合材料的拉伸强度提高,断裂拉伸应变降低;随着SEBS弹性体含量的增加,PTT/SEBS复合材料的流动阻力增大,流变性能降低。     

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。     

动态硫化SEBS/EPDM共混型热塑性弹性体的制备及性能研究

采用动态硫化方法制备SEBS/EPDM共混型热塑性弹性体,探讨了共混比对SEBS/EP-DM共混型热塑性弹性体的常温物理性能及高温物理性能的影响,同时,对其亚微现形态结构进行了表征,讨论了它的结构与性能的关系.结果表明,当共混比大于40:60时,可制备出较理想的SEBS/EPDM共混型热塑性弹性体.     

SEBS新型热塑性弹性体

概述了新型热塑性弹性体SEBS的性能、用途以及广阔的需求市场；概述了SEBS制造工艺和国内外SEBS发展状况；指出了我国应在发展SBS生产基础上加大投入力度，争取SEBS早日实现工业化生产。     

弹性体对透明PP结晶行为、透明性能和微观结构的影响

以弹性体SEBS作为增韧剂制备高韧性透明PP材料.通过DSC、PLM、熔体指数、透明性能、力学性能等测试研究了不同SEBS含量的透明PP共混物的结晶行为、透明和力学性能.结果表明:随着SEBS含量的增加,共混物的冲击强度有较大幅度的提高,提高近20倍.当SEBS含量为15％时可以很好地改善体系的加工流动性;SEBS的加入量较大时会明显降低体系的结晶度;弹性体SEBS和成核剂并不具有协同成核效果;随着弹性体含量的逐渐增大,PP材料的透明性能大幅度降低.     

仪表板蒙皮用搪塑PP/SEBS/POE复合材料的制备及性能研究

选用三种POE和一种SEBS弹性体材料,采用熔融共混的方法制备PP/SEBS/POE复合材料。探究弹性体种类和掺量对复合材料的力学性能、光学性能和微观结构的影响。结果表明:当弹性体掺量为20 phr,选用POE940和SEBS弹性体的PP/SEBS/POE复合材料力学性能和光学性能最佳,其拉伸强度达到27.3 MPa,低温冲击强度达到34.1 k J/m2,透明度达到79.4%,雾度为20.1%。POM和SEM分析表明:弹性体SEBS和POE940的柔性链可以与PP分子链良好缠连,在断口表面形成波状和网状结构。这种网络结构能够吸收材料受应力作用的能量,也可以有效阻碍复合材料形成规律晶格,降低球晶尺寸,增强光学性能。     

膨胀石墨改性氢化苯乙烯-丁二烯-苯乙烯嵌段共聚物/聚丙烯弹性体的制备与性能

分别采用膨胀石墨和纳米Fe₃O₄插层膨胀石墨改性氢化苯乙烯-丁二烯-苯乙烯嵌段共聚物(SEBS)/聚丙烯(PP)弹性体材料,探讨了膨胀石墨用量及纳米Fe₃O₄插层复合膨胀石墨对弹性体拉伸性能、回弹性和导电性能的影响规律。结果表明,膨胀石墨的加入可有效提高SEBS/PP弹性体的回弹性和导电性能,当膨胀石墨用量为3.5份(质量)时,弹性体的回弹性最佳,表面电阻率最低,但其拉伸强度有所下降。采用纳米Fe₃O₄插层膨胀石墨改性SEBS/PP弹性体可有效改善其拉伸性能,并可进一步降低表面电阻率和体积电阻率。     

软段多重氢键动态交联三嵌段弹性体的制备与性能

苯乙烯-乙烯-丁烯-苯乙烯三嵌段共聚物(SEBS)弹性体存在回弹性差、使用上限温度低等问题。为解决上述问题,通过改变SEBS软段(EB相)化学结构,制备SEBS软段含二重氢键和四重氢键动态交联弹性体。采用核磁、红外等手段表征材料微观结构,表明两种基于软段含多重氢键动态交联SEBS弹性体的成功制备。研究二重氢键和四重氢键对SEBS弹性体力学性能、回弹性、耐热性、流变性等性能的影响。结果表明,含四重氢键UPy-SEBS的EB相T_g提升至-34℃,且UPy-SEBS在100%应变下的弹性回复率达到86%,同时UPy-SEBS使用上限温度达到231℃。多重氢键动态交联SEBS是一种高耐热高回弹环保型热塑性弹性体,在绿色耐高温黏接剂等领域具有巨大应用潜力。     

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。     

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。     

Effects of addition of functionalized SEBS on rheological,mechanical, and tribological properties of polyamide 6 nanocomposites

The effects of the addition of styrene‐ethylene/butylene‐styrene copolymer (SEBS) with various functionalized groups on the rheological, mechanical, and tribological properties on polyamide 6 nanocomposite filled with layered silicate (PA6/Clay) were investigated. Four types of SEBS: unmodified SEBS (SEBS), maleic anhydride grafted SEBS (SEBS‐g‐MA), amine group grafted SEBS (SEBS‐g‐NH₂), and carboxyl group grafted SEBS (SEBS‐g‐COOH) were added with PA6/Clay nanocomposite to prepare various polymer blends. These polymer blends were extruded by a twin screw extruder and injection molded. Dynamic viscoelastic properties of these blends in the molten state and their tensile, impact, and tribological properties were evaluated. The viscoelastic properties were found to increase with the addition of SEBS and were highly influenced by the types of functionalized groups contained. Influence of the addition of SEBS on the mechanical properties of these systems differed for each mechanical property. Although the tensile properties decreased with SEBS, Izod impact properties improved with the addition of various functionalized SEBS. These mechanical properties and viscoelastic properties correlated closely with the size of dispersed SEBS particles and interparticle distance. The tribological properties also improved with the addition of SEBS, and the influence of the amount added was higher than the type of SEBS used. POLYM. ENG. SCI., 2010. © 2009 Society of Plastics Engineers     

SEBS的臭氧处理及增韧PA6的研究

研究了臭氧处理对氢化苯乙烯-丁二烯-苯乙烯嵌段共聚物(SEBS)分子结构及其极性的影响,并对臭氧处理SEBS增韧PA6进行了研究。结果表明,通过臭氧处理可在SEBS分子链上引入羰基含氧基团,臭氧处理的SEBS相对分子质量下降,相对分子质量分布变宽,表面能提高,极性增大。与PA6／SEBS体系相比,PA6／臭氧处理SEBS体系的相容性得到明显改善,其冲击强度和断裂伸长率大幅度提高。     

Drop weight impact and work of fracture of short glass fiber reinforced polypropylene composites toughened with elastomer

Short glass fiber (SGF) reinforced polypropylene composites toughened with styrene‐ethylene butylene‐styrene (SEBS) or maleated SEBS (SEBS‐g‐MA) triblock copolymer were injection molded. Charpy drop‐weight impact properties and the impact essential work of fracture (EWF) of the SGF/SEBS/PP and SGF/SEBS‐g‐MA/PP hybrids were investigated. Drop‐weight impact results revealed that the SGF/SEBS/PP hybrid exhibits higher impact strength than the SGF/SEBS‐g‐MA/PP hybrid at low impact speeds. This was derived from the pull‐out of fibers from the SGF/SEBS/PP hybrid. At high impact speeds, the impact strength of the SGF/SEBS‐g‐MA/PP hybrid was slightly higher than that of the SGF/SEBS/PP hybrid. Impact EWF measurements showed that the hybrids only exhibit specific essential work (W_e) at a high impact speed of 3 ms⁻¹. The non‐essential work does not occur in the hybrids under high impact rate loading conditions. Moreover, SEBS or SEBS‐g‐MA addition was beneficial in enhancing the high‐rate specific essential work of the SGF/SEBS/PP and SGF/SEBS‐g‐MA/PP hybrid composites.     

Modification of styrene–ethylene/butylene–styrene copolymer microstructure by polystyrene homopolymer and evolution of a cocontinuous blend morphology

Styrene–ethylene/butylene–styrene (SEBS) copolymer was blended with the homopolymer polystyrene (hPS) in a counter‐rotating twin‐screw extruder to prepare hPS/SEBS blends. The morphology of the hPS/SEBS blends was studied by environmental scanning electron microscopy (ESEM) and by transmission electron microscopy (TEM). TEM imaging of pure SEBS revealed a microphase‐separated morphology, showing ordered regions or grains where the discrete styrene blocks formed hexagonally packed cylindrical structures within the ethylene/butylene matrix. Blending of small quantities of the homopolymer hPS showed an interesting result. The TEM images of the SEBS‐rich blends revealed that the added hPS was absorbed within the bulk of the SEBS phase resulting in a new SEBS‐rich phase, and the absorbed hPS was found to join the styrene cylinders of pure SEBS thereby modifying its original microstructure. As the hPS concentration in the blends was increased further, the ESEM and TEM images showed that the excess homopolymer hPS phase separated, forming a cocontinuous morphology with the hPS‐modified SEBS‐rich phases. Linear viscoelastic tests on the SEBS‐rich blends also revealed the existence of a synergistic effect, showing increased elastic behavior compared with that of pure SEBS. Small‐angle X‐ray scattering results showed an additional periodicity in the SEBS‐rich phase because of the modification of the SEBS microstructure by hPS. POLYM. ENG. SCI., 2012. © 2012 Society of Plastics Engineers     

充油SEBS改性PP性能研究

用DSC与TG研究了不同的充油比及不同苯乙烯-乙烯/丁烯-苯乙烯(SEBS)摩尔质量时充油SEBS/聚丙烯(PP)共混体系的结晶性能与热稳定性;同时考察共混体系的力学性能和流变性能。结果表明:随着充油比(即油弹比,m油/mSEBS)的增大,熔体质量流动速率(MFR)显著增加,拉伸屈服强度、熔点、结晶度和硬度显著下降。SEBS的摩尔质量影响其对油的吸附能力,摩尔质量越大,吸油能力越好。随着SEBS摩尔质量的增大,材料的熔点、结晶度、拉伸屈服强度增大,硬度变化不明显。     

LDPE/SEBS复合材料化学交联及相关性能的研究

采用二段混炼的方法,制备低密度聚乙烯/苯乙烯-乙烯-丁烯-苯乙烯嵌段共聚物(LDPE/SEBS)复合材料。探究SEBS的不同含量对LDPE/SEBS力学性能的影响。通过双叔丁基过氧异丙基苯(BIBP)化学交联LDPE/SEBS,制备LDPE/SEBS/BIBP复合材料,探究LDPE/SEBS/BIBP的力学性能、微观形貌、凝胶含量、热学性能和流变性能。结果表明:SEBS用量为50份时,LDPE/SEBS具有较好的力学性能。当BIBP用量为0.9份,LDPE/SEBS/BIBP的力学性能最佳,拉伸强度为26.22 MPa,断裂伸长率为732.23%。随着BIBP用量的增加,LDPE/SEBS/BIBP的界面相容性、凝胶含量和黏度上升,熔融温度、结晶度和损耗模量下降,储能模量曲线的斜率先下降后趋于稳定。     

Influence of the incorporation of fine calcium carbonate particles on the impact strength of polypropylene/polystyrene‐block‐poly(ethylene butene)‐block‐polystyrene blends

The Izod impact strength of two kinds of ternary composites was investigated. One consisted of polypropylene (PP), the triblock copolymer polystyrene‐block‐poly(ethylene butene)‐block‐polystyrene (SEBS), and calcium carbonate (CaCO₃) particles, and the other consisted of PP, carboxylated SEBS (C‐SEBS), and CaCO₃ particles. The mean size of the CaCO₃ particles was about 160 nm. According to scanning electron microscopy observations, the composite with SEBS showed a morphology in which SEBS domains and CaCO₃ particles were independently dispersed in the PP matrix. On the other hand, the composite with C‐SEBS showed a morphology in which CaCO₃ particles were encapsulated by C‐SEBS; that is, a core–shell structure was formed. The Izod impact strength of the composite with SEBS was higher than that of the composite with C‐SEBS and the PP/SEBS and PP/C‐SEBS binary blends. According to observations of the fractured surface, the stress‐whitened area was larger in the composite with SEBS than in the composite with C‐SEBS and the PP/SEBS and PP/C‐SEBS binary blends. The toughening mechanism of the composite, using nanometer‐sized CaCO₃ particles in combination with SEBS, was examined. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2009     

SEBS接枝MAH改性PA6物理性能研究

研究了PA6/SEBS和PA6/SEBS-g-MAH共混体系与PA6/SEBS/SEBS-g-MAH三元共混体系的力学性能与流变性能变化。结果表明,采用SEBS增韧尼龙6,控制SEBS和SEBS-g-MAH的比例,在SEBS总量为20%时能够制得超韧性的尼龙6,缺口冲击强度可达到90kJ/m2以上。PA6/SEBS表现出不相容共混体系的流变行为,PA6/SEBS-g-MAH共混体系高于共混物中任一组分的粘度,反映出共混后增强了两相的界面相互作用。三元共混体系的粘度表现为SEBS和SEBS-g-MAH共同作用结果。     

Thermal conductivities of blends of polyethylene/SEBS block copolymer and polystyrene/SEBS block copolymer

Thermal conductivities of two series of blends of polystyrene and styrene–ethylene/butyrene–styrene block copolymer (PS/SEBS), and polyethylene and styrene-ethylene/butylene-styrene block copolymer (PE/SEBS) were measured. Here the PS part and hydrogenated polybutadiene (EB; ethylene-butene-1 copolymer) part of SEBS were confirmed to be miscible in PS and PE homopolymers, respectively, by the differential scanning calorimetry. The thermal conductivity of PS/SEBS increased, while that of PE/SEBS blends decreased monotonically, with increasing SEBS content. No significant changes in the range where microphases usually occur were noted. The thermal conductivities of PS/SEBS and PE/SEBS were explained by modifications of our equation for composites. Thermal conductivity of EB in SEBS was estimated from that of PS/SEBS blend as 4.9 × 10^?4 cal/s cm °C. Further, the thermal conductivity of PE/SEBS could be predicted by substituting the obtained value of EB into the modified equation. Therefore, the modified equations were confirmed to be applicable to thermal conductivities of PE/SEBS and PE/SEBS blends. © 1993 John Wiley & Sons, Inc.     

Assessment of compatibilization efficiency of SEBS in the PP/PS blend

The compatibilization efficiency of styrene–ethylene/butylene–styrene (SEBS) triblock copolymer in immiscible polypropylene (PP)/polystyrene (PS) 20/80 blends was evaluated in terms of not only morphology, but also rheology and fractionated crystallization behavior. Besides varying SEBS loading, four different mixing protocols were used to vary SEBS dispersion state. PP²/PS/SEBS blend, prepared by two‐step method mixing PS and SEBS primarily, presents the largest droplet size (1.278 μm) at the critical compatibilizer concentration (CCC = 1 wt %). However, the CCC of blends prepared by the other protocols is 2 wt %. And at the CCC, PP/PS²/SEBS (two step method mixing PP and SEBS primarily) shows the smallest droplet size (0.908 μm), followed by PP/PS/SEBS (one step method). The rheology and crystallization behavior of PP/PS blends could also be utilized to assess the compatibilization efficiency of SEBS, but only in the case of mixing under the same protocol and the content of SEBS below a CCC. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018 , 135, 46244.