SEBS对丙烯酸酯改性SEBS/SBS基胶粘剂性能的影响

以SEBS(苯乙烯-乙烯-丁烯-苯乙烯共聚物)、SBS(苯乙烯-丁二烯-苯乙烯共聚物)、丙烯酸酯、环保型溶剂和过氧化二苯甲酰(BPO)等为原料,制备出SEBS/SBS基胶粘剂,并着重考察了SEBS掺量对胶粘剂的黏度、光学性能、电性能、力学性能及粘接性能等影响。研究结果表明:当w(SEBS)=5%~25%(相对于基体树脂总质量而言)时,胶粘剂的黏度适中,适合施工操作;当w(SEBS)=15%时,胶粘剂的接枝率、接枝效率(分别为17.11%、87.43%)相对最大,而单体转化率(为97.17%~98.36%)则变化不大;随着SEBS掺量的增加,胶粘剂的剪切强度或180°剥离强度呈先升后降态势,并且在w(SEBS)=25%或30%时相对最大(为1.87 MPa或1.73 k N/m),而且与不加SEBS体系相比分别增加了24.67%、140.28%。     

MAH改性SEBS性能影响因素探讨

利用双螺杆熔融接枝反应制备聚苯乙烯-聚乙烯-聚丁二烯-聚苯乙烯接枝马来酸酐（SEBS—g—MAH）．考察各种因素对接枝的影响。研究表明。当MAH的加入量从0．8份增加到1．2份时,接枝率从0．60％增加到0．85％;随着SEBS相对分子质量的增大,反应接枝率逐步降低;对双叔丁过氧异丙苯（BIBP）的用量为0．10～0．12份时,有利于接枝产品综合性能的控制;共聚聚丙烯（CO—PP）的加入能改善产品的加工流动性。     

BR/SEBS硫化胶的制备与性能研究

为拓宽顺丁橡胶(BR)的更广泛的应用,开发现代高性能顺丁橡胶复合材料,本文并用氢化SBS(SEBS)改善BR的抗拉强度和撕裂强度,研究了SEBS含量变化对BR/SEBS并用胶性能的影响。结果表明:BR/SEBS混炼胶的正硫化时间减少,交联密度下降,门尼黏度在SEBS含量为20份时最低,相应的BR/SEBS硫化胶的抗拉强度和撕裂强度最佳,分别是BR硫化胶的1.8倍和1.5倍;经过热空气老化,BR及BR/SEBS硫化胶的抗拉强度和撕裂强度均下降,但SEBS含量高于20份时,老化后的BR/SEBS硫化胶的抗拉强度和撕裂强度高于未老化的BR硫化胶。     

Dynamic mechanical and impact properties of PP/SEBS blend

Studies on impact behaviour of the blend of isotactic polypropylene (PP) with styrene-b-ethylene-co-butylene–b-styrene triblock copolymer (SEBS) in the composition range 0–25 wt % SEBS at three temperatures, viz., ambient, ?30°C, and ?190°C, are presented. Dynamic mechanical properties on a torsion pendulum in the temperature range ?100?100°C are also studied for this blend at various compositions. Scanning electron microscopic studies of the impact-fractured surfaces are presented to illustrate the differences in the mode of fracture at the three temperatures of impact tests. Choice of the three temperatures for impact tests was such that the effect of shear yielding mechanism of toughening of PP at ambient temperature remains suppressed at ?30°C, whereas at the lowest temperature (i.e., ?190°C) the elastomeric role of the inclusion SEBS is suppressed. The observed considerably large difference in impact toughening at ambient temperature and at ?;30°C seems not entirely accountable by the prevalence of shear yielding or crazing mechanisms in the respective temperature regions. A third mechanism, viz., viscoelastic energy dissipation, is invoked to account for the observed large difference of impact toughening at these two upper temperatures. Correlation of peak area of dynamic mechanical loss peaks occurring below the impact test temperature with the impact strength is also shown. This suggests greater significance of viscoelastic energy dissipation mechanism in the toughening of this blend at ambient temperature than at ?30°C.     

Research for SEBS/PPA compound‐modified asphalt

In this study, polyphosphoric acid (PPA) was used to modify styrene–ethylene/butylene–styrene (SEBS)‐modified asphalt further and decrease the SEBS content in asphalt. Different structural analysis methods including morphology observation, infrared spectroscopy, thermal analysis were used to investigate the structural characteristics of asphalt modified by SEBS or PPA before and after short‐ or long‐term thermal ageing. The study shows the suitable addition of PPA can improve the major physical and rheological properties of SEBS‐modified (SM) asphalt and the improved properties became more obvious with further ageing. 0.8 wt % PPA can replace 2 wt % SEBS in the modification. Morphology observation showed PPA increased the incompatibility between SEBS and asphalt. Thermal analysis showed PPA changed the energy consumption and mass loss of SM asphalt greatly at elevated temperatures and led to the more complex structural characteristics. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018 , 135, 46085.     

SEBS/蒙脱土复合材料结构及热性能研究

采用十二烷基三苯基溴化膦(DTPB)改性钠基蒙脱土(Na+-MMT),利用熔融插层法制备氢化苯乙烯-丁二烯-苯乙烯嵌段共聚物(SEBS)/蒙脱土复合材料。采用X射线衍射仪、红外光谱仪、场发射扫描电镜、热重分析仪对样品进行结构表征和性能测试,比较不同有机化蒙脱土(OMMT)对SEBS/OMMT复合材料的影响。结果表明:无论是MMT还是OMMT都起到了阻止SEBS热失重进程的发展,且携带苯基的DTPB有机改性剂有利于OMMT与SEBS复合材料的相容性。     

Synthesis and characterization of sPS/montmorillonite nanocomposites

The present work analyzed the possibility of obtaining and producing syndiotactic polystyrene (sPS)–based nanocomposites. The work first focused on possible technology to use for intercalation from solution and melt intercalation. Using a blend of sPS with atactic polystyrene (aPS) as the matrix was also considered. Thermal analysis techniques, such as differential scanning calorimetry (DSC) and thermogravimetry (TGA), were used to study the thermal properties and stability of the nanocomposites obtained and to select the most appropriate nanocharges. The effect of the introduction of nanofillers on these properties also was evaluated. X–ray diffraction was used to investigate the degree of clay exfoliation. Finally, mechanical characterization of the nanocomposites obtained was performed and compared to that of the pure material. The tests demonstrated that nanodispersion of phyllosilicate layers improved the mechanical behavior of the polymers analyzed, especially the annealed sPS. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 100: 4957–4963, 2006     

Morphology of HDPE/(PEC/PS) blends modified with SEBS copolymers

In this study, immiscible blends of HDPE and an amorphous glassy polymer were compatibilized with styrene-hydrogenated butadiene block copolymers. The glassy phase consisted of either pure PS or a miscible blend of PS and polyether copolymer (PEC); PEC is similar to poly(2,6-dimethyl-1,4-phenylene oxide) (PPO). The morphology of these two-phase mixtures depended on physical characteristics of the components and the method of fabrication. Suitable copolymers increased the degree of dispersion and minimized heterogeneities resulting from the inherent incompatibility of the individual phases. Further reduction in the phase size and increased adhesion between the components of modified blends were achieved by increasing the composition of PEC in the glassy phase. It was concluded that favorable exothermic mixing between PEC and PS endblocks of the copolymers provided an additional driving force for compatibilization. Results from dynamic mechanical thermal analysis suggests that penetration by the copolymers into the homopolymer phases is not complete.     

SEBS增韧PPO/PA6合金结构与性能研究

采用双螺杆熔融挤出的方法制备了氢化(苯乙烯-丁二烯-苯乙烯)共聚物(SEBS)增韧聚苯醚/聚酰胺6(PPO/PA6)合金。通过扫描电子显微镜(SEM)、差示扫描量热(DSC)分析、毛细管流变分析、动态热机械分析(DMA)等方法研究了PPO/PA6合金的断面形貌、结晶性能、流变性能和动态力学性能。结果表明:加入SEBS后,共混合金的断裂方式由脆性断裂向韧性断裂转变;合金材料的结晶度降低,表观黏度提高,储能模量下降,冲击性能得到明显改善。     

sPS/PBA-aPS共混物的结晶与熔融行为

通过熔融共混法制备了间规立构聚苯乙烯/聚丙烯酸丁酯无规立构聚苯乙烯核壳乳胶粒子（sPS/PBA-aPS）共混物,采用差示扫描量热仪、X射线衍射仪和偏光显微镜研究了PBA-aPS对sPS结晶性能、结晶形态的影响,以及共混物在不同降温速率下、等温结晶条件下所得试样的熔融行为。结果表明, PBA-aPS的引入对sPS的结晶起阻碍作用,sPS及其共混物存在明显熔融重结晶再熔融现象,sPS平衡熔点为293.2 ℃,共混物的平衡熔点随PBA-aPS含量增加而降低,sPS形成β型大球晶完善性变差,sPS/PBA-aPS共混物的冲击强度明显提高,sPS/PBA-aPS质量比为80:20时,冲击强度提高了117 %。     

SEBS改性磺化沥青性能的研究

通过向建筑沥青中加入SEBS磺化得到改性磺化沥青,研究了磺化剂用量对磺化沥青降滤失性能的影响。并对磺化沥青进行了扫描电镜、Zeta电位、降滤失性能及配伍性研究。结果表明,当SEBS加量为5%,磺化比为1∶0.7时,高温高压滤失量达到24 m L,高温高压滤失量降低率达到55.56%,具有良好的降滤失性能;改性后的磺化沥青具有较好的配伍性,当样品加量达到2%,高温高压滤失量降低率达到了45.45%,说明改性磺化沥青具有良好的封堵性能。     

Augmentation of performance properties of maleated SEBS/TPU blends through reactive blending

Meticulous investigation of reactive blending of maleic anhydride grafted styrene–ethylene–butylene–styrene (SEBS-g-MA) and thermoplastic polyurethane (TPU) is carried out to achieve systems with controllable morphology and superior mechanical properties. Two types of SEBS-g-MA (abbreviated as M1, M2) with different maleic anhydride content were used to separately blend with TPU. Formation of imide group from the interaction of isocyanate and maleic anhydride predicted from the plausible reaction scheme was confirmed through Fourier transform infrared spectroscopy. High tensile strength of the blends along with appreciable elongation at break was witnessed. Morphology analyses using scanning electron microscopy and atomic force microscopy exposed a vivid and homogenous droplet morphology in all the blends presumably due to in situ formation of a suitable copolymer at the interface. Differential scanning calorimetry was used to pursue the thermal characteristics of the blends. Melt-rheological behavior of the blends was examined using a rubber process analyzer. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020 , 137, 48727.     

MQ硅树脂/纳米TiO_2复合改性环氧树脂的结构与性能

以环氧树脂(EP)为基体树脂,以MQ硅树脂和纳米TiO_2(nano-TiO_2)同时作为EP的增韧改性剂,由此制备了nano-TiO_2/MQ硅树脂/EP复合材料。研究结果表明:MQ硅树脂已成功接枝在EP分子链上;当m(MQ硅树脂):m(nano-TiO_2):m(EP)=15:3:100时,nano-TiO_2/MQ硅树脂/EP复合体系的耐热性能明显提高,拉伸强度和冲击强度分别提高了66.6%和68.1%,其断面呈韧性断裂特征。     

Triblock SEBS/DVB crosslinked and sulfonated membranes: Fuel cell performance and conductivity

A set of styrene-ethylene-butylene-styrene triblock copolymer (SEBS) membranes with 10 or 25 wt% divinyl-benzene (DVB) as a crosslinking agent were prepared and validated. Physicochemical characterization revealed suitable hydrolytic and thermal stability of photo-crosslinked membranes containing 25 wt% DVB and post-sulfonated. These compositions were evaluated in H₂/O₂ single cells, and electrical and proton conductivities were furtherly assessed. The membranes with the milder post-sulfonation showed greater proton conductivity than those with excessive sulfonation. In terms of electrical conductivity, a universal power law was applied, and the values obtained were low enough for being used as polyelectrolytes. At the analyzed temperatures, the charge transport process follows a long-range pathway or vehicular model. Finally, fuel cell performance revealed the best behavior for the membrane with 25 wt% DVB, photo-crosslinked during 30 min and mild sulfonated, with a promising power density of 526 mW·cm⁻². Overall, the results obtained highlight the promising fuel cell performance of these cost-effective triblock copolymer-based membranes and indicate that higher sulfonation does not necessarily imply better power density.     

HDPE/sPS共混体系结构与性能的研究

用2种分子量不同的苯乙烯-(乙烯/丁烯)-苯乙烯三嵌段共聚物(SEBS)和一种苯乙烯-b-乙烯/丁烯(SEB)两嵌段共聚物为增容剂,对高密度聚乙烯(HDPE)/间规聚苯乙烯(sPS)共混物进行增容.采用扫描电镜(SEM)及拉伸试验研究了增溶剂的分子量及结构对共混物形态结构及力学性能的影响.结果表明:3种增容剂SEBS(SEB)均可有效地降低sPS分散相的尺寸并增加HDPE/sPS共混物的界面强度,从而提高其力学性能.sPS 的掺入可以显著提高HDPE的耐热性能.     

Structure and Properties of PPO/PP Blends Compatibilized by Triblock Copolymer SEBS and SEPS

Morphology, mechanical behavior and other properties of isotactic polypropylene (iPP) and poly(phenylene oxide) (PPO) blends were studied. Large PPO particle sizes or delamination were found in binary iPP/PPO blends when no compatibilizers were added, while fracture toughness of the binary alloy was higher than that of both pure iPP and PPO. The addition of compatibilizers, triblock copolymers SEBS and SEPS, tremendously improved PPO particle dispersion and particle-matrix interfacial adhesion in iPP. The results of mechanical properties of the ternary iPP/PPO/compatibilizer blends showed that the compatiblization of SEPS is better than that of SEBS.     

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.     

PP-g-MAH对SEBS/PP/MH/EG阻燃复合体系结构与性能的影响

在氢氧化镁(MH)与可膨胀石墨(EG)复配阻燃石蜡油改性苯乙烯-乙烯/丁烯-苯乙烯(SEBS)/聚丙烯(PP)共混物(O-SEBS/PP)体系中,用马来酸酐接枝聚丙烯(PP-g-MAH)增容,研究其对O-SEBS/PP/MH/EG阻燃复合体系结构和性能的影响。结果表明:以一定量的PP-g-MAH代替基体中的PP增容后,复合材料在保持UL94垂直燃烧V-0级的同时,拉伸强度(σmax)与100%定伸强度(σ100)随着PP-g-MAH用量的增加而增大,在质量分数为6%时,分别为13.4 MPa和9.0 MPa,较未添加PP-g-MAH时分别提高13.6%和76.5%;撕裂强度则下降4.0%。复合材料的毛细管流变实验和淬断面扫描电子显微照片分析表明:PP-g-MAH的加入改善了复合材料中MH、EG与O-SEBS/PP共混物基体间的界面黏合力,提高了相容性。     

sPS/PBA-aPS共混物的非等温结晶动力学

采用差示扫描量热仪(DSC)研究了间规立构聚苯乙烯/聚丙烯酸丁酯-无规立构聚苯乙烯核壳乳胶粒子(sPS/PBA-aPS)共混物非等温结晶及其动力学。通过Jeziorny法和Mo法分别对s PS/PBA-aPS共混物的非等温结晶过程进行了分析处理,结果表明:随着降温速率增加,s PS结晶时间变短,结晶不完善程度增加;PBA-aPS核壳乳胶粒子的引入对sPS结晶起阻碍作用,Jeziorny法和Mo法都适用于分析sPS/PBA-aPS共混物的非等温结晶过程。     

填料改性充油SEBS力学性能的研究

采用熔融共混方法研究了碳酸钙填充充油SEBS复合材料的力学性能的影响。力学性能测试表明:填料的种类不同对SEBS复合材料的性能有一定的影响,随着填料的用量增加,共混物的拉伸强度下降,100%拉伸永久变形、扯断永久变形和断裂伸长率都逐渐增大。