SEBS/PP热塑性弹性体压缩永久变形性能的研究

研究主体材料并用比以及石蜡油、碳酸钙和乙烯丙烯酸树脂用量对氢化苯乙烯-丁二烯-苯乙烯嵌段共聚物(SEBS)/聚丙烯(PP)热塑性弹性体(TPE)性能的影响。结果表明:随着SEBS/PP并用比减小,TPE的邵尔A型硬度和压缩永久变形增大;当石蜡油用量为70份时,TPE的拉伸强度最大,压缩永久变形最小;碳酸钙用量增大,TPE的压缩永久变形减小;添加乙烯丙烯酸树脂,TPE的压缩永久变形先减小后增大,最佳用量为3份。     

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。     

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。     

低挤出加工温度耳机线专用热塑性弹性体复合材料的制备及性能研究

系统研究了不同化学结构的聚丙烯(PP)、苯乙烯-乙烯/丁烯-苯乙烯共聚物(SEBS)和碳酸钙对热塑性弹性体复合材料挤出加工温度的影响。实验结果表明,PP的化学结构和PP的添加量是影响复合材料的挤出加工温度的两个最重要因素,低熔点的无规共聚PP和低PP添加量可以有效降低材料的挤出加工温度;SEBS的摩尔质量和碳酸钙的含量对材料的加工温度无劣化作用。     

充油SEBS/PP热塑性弹性体的制备及性能研究

采用HAAKE转矩流变仪制备了充油苯乙烯-乙烯-丁二烯-苯乙烯嵌段共聚物/聚丙烯(SEBS/PP)热塑性弹性体,利用热重分析(TG)、差示扫描量热法(DSC)等研究了填充油对SEBS/PP加工性能、热稳定性和力学性能的影响,并考察了该充油SEBS/PP中PP的结晶行为。结果表明:填充油的加入可以明显改善SEBS/PP的加工性能。在各种充油SEBS/PP体系中,添加了石蜡油KP6030的SEBS/PP体系具有最优综合力学性能,而且该体系的热分解温度最高、失重率最低、热稳定性能最好。另外在充油SEBS/PP体系中,PP的结晶温度降低、结晶度基本不变、结晶速率加快。     

剪切速率对动态硫化PP/EPDM热塑性弹性体相态结构及性能的影响

采用动态硫化法,在双螺杆挤出机中制备以聚丙烯(PP)/三元乙丙橡胶(EPDM)为基体材料的热塑性弹性体,研究螺杆转速对PP/EPDM热塑性弹性体相态结构及性能的影响;采用差示扫描量热(DSC)仪分析了PP/EPDM热塑性弹性体的结晶性能,通过扫描电子显微镜(SEM)分析PP/EPDM热塑性弹性体的微观相态结构,并用万能试验机等对其力学性能进行测试。结果表明,随着螺杆转速的增加,PP/EPDM热塑性弹性体的结晶温度降低,凝胶含量、拉伸强度和断裂伸长率先增大后减小,压缩永久变形先减小后增大,而螺杆转速对硬度的影响不明显。当螺杆转速为180 r/min时,PP/EPDM热塑性弹性体的凝胶含量、拉伸强度和断裂伸长率均达到最大值,分别为56.8%,15.9 MPa和634%,压缩永久变形和硬度(邵A)均达到最小值,分别为68.8%,88。     

EPDM/POE/PP共混制备热塑性弹性体的性能研究

采用动态硫化的方法制备三元乙丙橡胶（EPDM）/聚烯烃弹性体（POE）/聚丙烯（PP）热塑性弹性体,讨论了EPDM、硫化剂、炭黑的用量和填料种类对热塑性弹性体性能的影响。结果表明：随着EPDM用量的增加,EPDM/POE/PP热塑性弹性体的拉伸强度、定伸应力和硬度都呈减小趋势,而拉断永久变形呈上升趋势;随着SP-1055用量的增加,其压缩永久变形显著降低;随着炭黑用量的增加,弹性体的拉伸强度、定伸应力和硬度先下降后增加,而拉断伸长率、拉断永久变形和压缩永久变形先增大后降低;在不同填料种类中用N85作为填料时,弹性体的综合性能最好,压缩永久变形最小。     

EPDM/PP/POE热塑性弹性体性能的研究

研究三元乙丙橡胶(EPDM)/聚丙烯(PP)/聚烯烃弹性体(POE)热塑性弹性体的性能。结果表明:随着溴化辛基酚醛硫化树脂SP-1055用量增大,EPDM/PP/POE的硫化程度增大,硬度呈上升趋势,拉断伸长率、拉断永久变形和压缩永久变形呈减小趋势,定伸应力和拉伸强度先提高后降低;使用POE810,EPDM/PP/POE热塑性弹性体的100%定伸应力、拉伸强度和拉断永久变形较大,压缩永久变形较低,综合物理性能较好。     

石蜡油对动态硫化EPDM/PP热塑性弹性体力学性能的影响

通过双螺杆挤出机制备了动态硫化三元乙丙橡胶(EPDM)/聚丙烯(PP)热塑性弹性体。运用抽提法测试了该EPDM/PP弹性体的凝胶含量,并采用万能试验机等对其力学性能进行测试,研究了软化剂石蜡油的添加量对动态硫化EPDM/PP热塑性弹性体力学性能的影响。结果表明:当石蜡油添加量为20%时,EPDM/PP共混物的凝胶含量最大;当石蜡油添加量为25%时,EPDM/PP共混物的拉伸强度和断裂伸长率均达到最大值。此外,石蜡油的引入不仅能降低EPDM/PP热塑性弹性体的硬度和压缩永久变形,还能提高材料的耐热氧老化性能,其适宜添加量为20%~25%。     

动态硫化IIR/PP热塑性弹性体的结构与性能Ⅱ.影响IIR/PP热塑性弹性体弹性性能的因素

研究了影响丁基橡胶／聚丙烯热塑性弹性体弹性性能的因素，分析了高温压缩热塑性弹性体的压缩变形机理。结果表明，提高分散相的交联密度和连续相的结晶度都有助于改善丁基橡胶／聚丙烯热塑性弹性体的弹性；在氯化石蜡和二月桂酸二丁基锡的混合改性剂质量分数为PP总量的10％-20％时，可以大大降低材料的压缩永久变形；橡塑比越高，丁基橡胶／聚丙烯热塑性弹性体的弹性越好；压缩温度对弹性的影响很显著，随着压缩温度的提高，材料的压缩永久变形增大；在高温下，被增容的橡胶在压缩状态下黏性增大，弹性下降，产生压缩永久变形，同时高温条件下聚丙烯分子链运动加剧，部分大分子链发生移位。     

Effect of different fillers on physical,mechanical, and optical properties of styrenic‐based thermoplastic elastomers

The effects of different fillers on physical, mechanical, and optical properties of styrenic‐based thermoplastic elastomers were investigated by experimental study. Poly[styrene‐b‐(ethylene‐co‐butylene)‐b‐styrene] block copolymer (SEBS)‐based thermoplastic elastomer composites were prepared in a co‐rotating intermeshing twin‐screw extruder, using silica and calcite as filler materials with three different particle sizes. The loading ratios in the composites were varied. Hardness, density, tensile strength, tear strength, compression set, wear resistance, transmittance, and haze measurements were performed. Thermal properties and morphological structure were investigated by differential scanning calorimeter (DSC) and scanning electron microscopy (SEM), respectively. The results show that, an interaction between silica and the polymer matrix exists, whereas calcite does not show any interaction with the polymer. Therefore, it is concluded that, calcium carbonate can be used in the composite as filler for cost efficiency, whereas silica can be used as reinforcing material in SEBS‐based thermoplastic elastomer composites, when optical properties are also concerned. POLYM. ENG. SCI., 2010. © 2009 Society of Plastics Engineers     

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。     

PP/丙烯基弹性体/SEBS医用热塑性弹性体的性能

以聚丙烯(PP)、丙烯基弹性体和苯乙烯-乙烯-丁烯-苯乙烯嵌段共聚物(SEBS)为主要原材料,采用熔融共混改性方法制备PP/丙烯基弹性体和PP/丙烯基弹性体/SEBS两种热塑性弹性体。采用转矩流变仪、拉伸试验机、硬度计和雾度计分别对共混体系的流变性能、拉伸性能、硬度和透光率进行分析与表征。结果表明,随着PP/丙烯基弹性体配比的增加,二元共混体系的平衡扭矩降低、硬度(邵A)提高、透光率变好、断裂伸长率增加,当其配比为1∶1时,共混体系的拉伸强度达到最大值(34.2 MPa);当PP与丙烯基弹性体配比为1:1不变时,随着SEBS含量增加,三元共混体系的平衡扭矩增大、硬度(邵A)减小、透光率变差、断裂伸长率提高;当PP、丙烯基弹性体和SEBS配比为47.5∶47.5∶5时,共混体系的透光率可达87%,硬度(邵A)为87,拉伸强度为35.2 MPa,断裂伸长率为750%,100%定伸强度为11.8 MPa,可满足医疗输液器械的要求。     

聚烯烃弹性体/聚丙烯热塑性弹性体的制备及力学性能

以过氧化物为硫化剂,用动态硫化法制备了聚烯烃弹性体(POE)/聚丙烯(PP)热塑性弹性体,研究了硫化剂用量、填料种类和加工次数对体系力学性能的影响。结果表明,增加硫化剂用量可以提高体系的拉伸强度,降低拉伸永久变形和压缩永久变形。碳酸钙和滑石粉对POE/PP体系无明显增强作用,炭黑的增强作用较此二者明显一些,这三种填料加入后都会使体系的扯断伸长率降低而硬度增大。加入石蜡油会使体系的扯断伸长率和压缩永久变形增大、硬度和拉伸强度降低。加工次数对POE/PP体系的力学性能无明显影响,说明体系具有较好的重复加工性能。     

纳米CaCO3在SEBS／PP中的应用研究

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,以纳米碳酸钙和普通重质碳酸钙为填充材料,在一定的工艺条件下用开炼机混炼。通过对SEBS／PP力学性能的测试及扫描电镜的比较,研究了纳米碳酸钙和普通重质碳酸钙对SEBS／PP共混料性能的影响及在基体中的分散情况。实验结果表明,纳米碳酸钙对共混物起到补强作用且其在共混物体系内呈纳米分散,随着纳米碳酸钙用量的增加,材料性能呈上升趋势,至12份时达到最大值。     

Influence of Filler Size on Impact Properties of PP/Elastomer/Filler Ternary Composites

Influence of filler size on impact properties for polypropylene (PP)/elastomer/filler ternary composites was investigated. Calcium carbonate (CaCO₃) particles with a diameter in the range from 120 to 1200 nm were used as a filler and polystyrene-block-poly(ethylene-butene)-block-polystyrene triblock copolymer (SEBS) was used as an elastomer. In the PP/SEBS/CaCO₃ ternary composite, CaCO₃ particles and SEBS particles were dispersed in the PP matrix separately. In the case that SEBS elastomer volume fraction was below 0.12, the impact strength improved gradually with a decrease of CaCO₃ mean diameter from 1200 to 160 nm. In the case that SEBS volume fraction was above 0.17, the impact strength improved significantly by the incorporation of CaCO₃ particles with a mean diameter in the range from 120 to 900 nm. However, the impact strength hardly improved by the incorporation of CaCO₃ particles with a mean diameter of 1200 nm.     

酚醛交联PP/EPDM/SEBS的动态硫化性能

系统研究了酚醛树脂交联剂对聚丙烯/三元乙丙橡胶/苯乙烯一乙烯一丁二烯一苯乙烯共聚物(PP/EPDM/SEBS）动态硫化弹性体性能的影响:随着交联剂用量增加,材料的硬度和拉伸强度先增加然后趋于稳定,断裂伸长率、撕裂强度和熔体流动速率随之降低,压缩永久形变呈现先减小然后增大的趋势。在交联剂用量为10份(质量份,下同)时,制备出了高温下弹性优异的TPV材料,70 0C,125℃条件下的压缩永久形变分别为23. 9%和28. 30%,比未添加SEBS时分别降低了9. 8%和20. 7%,加人SEBS有效改善了材料的回弹性。随着剪切速率增加,材料的表观黏度降低,呈现剪切变稀现象。随着交联剂用量的增加,表观薪度呈现先增加后减小的规律,用量为10份时黏度最大。     

The influence and mechanism of elastomer types on electrical and mechanical properties of polypropylene insulation materials for high voltage cables

Polypropylene (PP) becomes a superior candidate material for new environmentally friendly cable main insulation with its excellent heat resistance, electrical properties, and degradability. However, in practical application, PP material is aging and vulnerable and its toughness is poor. The mechanical properties of PP material can be improved by elastomer modification, but the effects of different elastomers on the comprehensive properties of composite specimens are quite different. In this paper, the electrical and mechanical properties of different types of elastomer-modified PP composites are compared and analyzed by combining experimental and molecular simulation (MS) methods. The experimental results show that the SEBS/PP composite material has the lowest trap energy levels among all kinds of composite materials, its space charge accumulation is 1.96 × 10⁻⁹C, and the mechanical and rheological properties improvement of the composite is the most remarkable. Meanwhile, the volume resistivity is reduced by two orders of magnitude compared with pure PP. However, the breakdown strength of all kinds of composite materials decreases by different degrees after the modification. The solubility parameters (δ) and the free volume are further investigated by the molecular simulation, which shows that the δ of SEBS is similar to that of PP, which represents the best compatibility. Moreover, the SEBS/PP composite material has the strongest inter-molecular force and the most excellent toughness improvement for PP. This work provides a theoretical basis for elastomer selection in PP modification.