纳米SiO2改性EPDM/PP热塑性弹性体(TPE)性能研究

试验研究了纳米SiO2改性三元乙丙橡胶／聚丙烯(EPDM／PP)热塑性弹性体(TPE)的性能。结果显示：纳米SiO2对EPDM／PP热塑性弹性体的拉仲强度、扯断伸长率、耐磨性、抗老化性能以及热变形温度等性能指标均有不同程序的影响。所得结论可为有关工程应用提供理论指导。     

国外聚丙烯基热塑性弹性体的发展

以聚丙烯/三元乙丙橡胶型(PP/EPDM)热塑性弹性体(TPE)为例,介绍国外进行聚丙烯基TPE的研制、生产、应用和发展状况,指出了这类热塑性弹性体的发展方向。     

基于废旧轮胎胶粉的热塑性弹性体的制备及发泡性能研究

通过沥青改性胶粉及采用相容剂与聚丙烯共混制备了性能优良的热塑性弹性体(TPE)材料,并以超临界流体为发泡剂对其发泡性能进行了研究。实验结果表明,胶粉通过沥青改性后,可以明显地提高TPE的拉断伸长率,并且发泡TPE的泡孔平均直径增大,泡孔密度减少,相对密度减小,但是随着沥青用量的增加,材料的粘度降低,从而出现泡孔破裂和塌陷现象,最后导致泡孔平均直径和泡孔密度减小,相对密度增加。相容剂苯乙烯嵌段共聚物接枝马来酸酐(SEBS-g-MA)可以提TPE的拉断伸长率并改善泡孔结构。温度的升高和饱和压力的增大,都导致了发泡弹性体的泡孔增大,泡孔密度和相对密度减小。     

运动鞋中底用高弹性聚丙烯发泡材料的研制

以共聚聚丙烯(PP)树脂为主要原料,通过热塑性弹性体、多官能团助剂改性,获得可模压交联发泡PP材料。以带极性基团的改性烯烃类树脂提高粘接性能;通过调节聚烯烃弹性体、发泡剂、交联剂用量制得不同发泡倍率和力学性能的PP发泡材料,工业化生产出适合运动鞋中底的高弹性发泡材料。     

NBR／三元尼龙动态交联TPE的结构和性能

前言热塑性弹性体(TPE)由于加工简便、生产效率高、加工能耗低等优点而受到重视。橡胶—塑料机械共混过程中,使橡胶动态交联而制备TPE方法的出现,对推动现有橡胶品种的改性,获得具有不同性能的TPE品种提供了一种简便而实用的工艺。Coran等曾经系统地研究过不同体系动态交联T     

基于遗传算法的TPE材料改性研究

用硬脂酸镁和聚四氟乙烯对热塑性弹性体(TPE)进行改性,并用遗传算法得到最优配比,通过SEM分析其改性原理,最终获得熔体流动速率较高、表面触感柔和且耐刮擦性优异的新型TPE材料。     

可与多种材料粘合的新型热塑性弹性体

过去10年中,热塑性弹性体（TPE）与硬热塑性塑料复合注塑得到飞速发展。热塑性塑料应用于各种领域,包括PP、PS、ABS、共聚酯、SAN、PC等。最近,根据弹性体与热塑性塑料之间的表面能或极性的匹配性,针对各种基材开发了多种专用TPE。然而,这些TPE一般不能粘合到具有不同表面能的热塑性弹性体上,     

Hexpol联合Akro-Plastic打造轻量化TPE

<正>为进一步迎合广大客户对轻量化的市场需求,瑞典大型塑料生产集团Hexpol旗下子公司Müller Kunststoffe携手聚酰胺(PA)专业生产商Akro-Plastic共同研制出了一种名为Dryflex的热塑性弹性体(TPE)。该新型改性TPE质量轻便、密度极低、黏着性极强。据悉,作为Dryflex A产品家族的新成员,这一新型TPE将作为Akromid Lite和Akromid Xtra Lite这两款改性     

弹性体增韧聚丙烯研究进展

简述了采用弹性体对聚丙烯(PP)进行增韧改性的主要机理,分别介绍了利用各种弹性体、刚性粒子协同弹性体、成核剂协同弹性体对PP进行增韧改性的研究现状,以及它们对PP其他性能的影响。     

PP塑料工程化应用改性研究

采用熔融共混法，在对化学交联、结晶成核剂、纳米SiO2、纳米CaCO3改性聚丙烯等进行了系统研究的基础上，讨论了各因素对复合体系力学性能的影响规律，进一步研究了纳米填料、交联剂、β晶型成核剂3，3，5，5-四甲基联苯胺(TMB)、热塑性弹性体(TPE)共用时对聚丙烯的增强、增韧规律。结果表明，聚丙烯被同时增强、增韧的条件分别是体系中加入质量分数O．5％β晶型成核剂TMB和质量分数0．5％交联剂A；质量分数2％纳米SiO2与适量TPE质量分数5％～10％纳米CaCO3与质量分数O．5％β晶型成核剂TMB。     

Thermal properties and morphology of isotactic polypropylene/acrylonitrile–butadiene rubber blends in the presence and absence of a nanoclay

A thermoplastic elastomer (TPE) nanocomposite based on polypropylene (PP), acrylonitrile–butadiene rubber (NBR), and a nanoclay (NC) was prepared in a laboratory mixer with a 54/40/6 weight ratio. The effects of NC on the thermal properties, crystalline structure, and phase morphology of the TPE nanocomposite were studied in this work. The results obtained from the nonisothermal crystallization of PP, PP/NBR, and PP/NBR/NC, which was carried out with differential scanning calorimetry, revealed that the overall rate of crystallization of PP decreased with the addition of NBR to PP and increased when NC was incorporated into the nanocomposite. In addition, the crystallite size distribution was more uniform for the PP phase crystallized in the nanocomposite versus the PP itself. Also, although the PP in the reference blend (PP/NBR) crystallized only in the α form, the crystalline structure of the PP incorporated into the nanocomposite was a mixture of α‐ and γ‐crystalline forms. The effects of NC on the phase morphology of PP/NBR blends prepared with three different cooling methods (quenching in liquid nitrogen, cooling between two metal plates at room temperature, and molding at a high temperature in a hot press) were studied. For the samples quenched in liquid nitrogen or cooled between metal plates, a particulate–cocontinuous morphology formed. However, for the samples prepared under a hot press, a laminar‐like morphology was observed. In all three cases, a similar particulate–cocontinuous morphology formed for the reference blend, but the rubber inclusions were always smaller than those of the TPE nanocomposite. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2011     

共混型聚丙烯/超细粉末丁苯橡胶全硫化热塑性弹性体的制备及其结构与性能

以全硫化超细粉末丁苯橡胶(PSBR)与聚丙烯(PP)为原料,采用双螺杆挤出机共混方法制备PP/PSBR全硫化热塑性弹性体。通过透射电镜观测,发现PP/PSBR全硫化热塑性弹性体具有和动态硫化方法制备的热塑性弹性体相似的微观形态,PSBR粒子作为分散相分散在连续相PP中;所制备的热塑性弹性体的力学性能与PP的相对分子质量、共聚与否、PSBR含量及其交联度有关;通过流变行为研究,发现此类全硫化热塑性弹性体为假塑性流体,且橡胶的含量对热塑性弹性体的黏度影响很小;采用差示扫描量热法对PP/PSBR全硫化热塑性弹性体中连续相PP的结晶行为进行了研究,发现连续相PP的结晶温度提高,表明PSBR对PP有异相成核作用。     

炭黑/白炭黑双相填料补强BIIR/PP热塑性弹性体的性能研究

通过动态硫化工艺制备了溴化丁基橡胶（BIIR）/聚丙烯（PP）热塑性弹性体,研究了加工时间、填料、硫化剂对弹性体力学性能的影响。结果表明,动态硫化制备热塑性弹性体的时间约为13 min;使用炭黑N330/白炭黑双相填料的热塑性弹性体具有较好的力学性能;在氧化锌、硫磺、溴化辛基酚醛树脂及硫磺/溴化辛基酚醛树脂并用硫化体系中,溴化辛基酚醛树脂硫化的热塑性弹性体力学性能最佳。     

The influence of matrix viscosity and composition on the morphology,rheology, and mechanical properties of thermoplastic elastomer nanocomposites based on EPDM/PP

The morphological and rheological properties of thermoplastic elastomer nanocomposites (TPE nanocomposites) were studied using different viscosities of polypropylene (PP) and ethylene‐propylene‐diene monomer (EPDM) rubber content (20, 40, 60 wt%). The components, namely EPDM, PP, Cloisite 15A, and maleic anhydride‐modified PP as compatibilizer, were compounded by a one‐step melt mixing process in a laboratory internal mixer. The structure of the nanocomposites was characterized with X‐ray diffraction, scanning electron microscopy, transmission electron microscopy, and rheometry in small amplitude oscillatory shear. The distribution state of the clay between the two phases (PP and EPDM) was found to be dependent on the viscosity ratio of PP to EPDM. In the nanocomposites prepared based on low viscosity PP (LVP) and EPDM, the clay was mostly dispersed into the PP phase and the size of the dispersed rubber particles decreased in comparison with unfilled but otherwise similar blends. However, the dispersed elastomer droplet size in the high viscosity PP (HVP) blends containing 40 and 60% EPDM increased with the introduction of the clay. For TPE nanocomposites, the dependence of the storage modulus (G′) on angular frequency (ω) followed a clear nonterminal behavior. The increase in the storage modulus and the decrease in the terminal zone slope of the elastic modulus curve were found to be larger in the LVP nanocomposite in comparison with the HVP sample. The yield stress of nanoclay‐filled blends prepared with LVP increased more than that of HVP samples. The tensile modulus improved for all nanocomposites but a higher percentage of increase was observed in the case of LVP samples. POLYM. COMPOS., 2008. © 2008 Society of Plastics Engineers     

SBS and SEBS block copolymers as impact modifiers for polypropylene compounds

Blends of polypropylene (PP) and thermoplastic elastomers (TPE), namely SBS (styrene‐butadiene‐styrene) and SEBS (styrene‐ethylene/1‐butene‐styrene) block copolymers, were prepared to evaluate the effectiveness of the TPE type as an impact modifier for PP and influence of the concentration of elastomer on the polymer properties. Polypropylene homopolymer (PP‐H) and ethylene–propylene random copolymer (PP‐R) were evaluated as the PP matrix. Results showed that TPEs had a nucleating effect that caused the PP crystallization temperature to increase, with SBS being more effective than SEBS. Microstructure characterization tests showed that in most cases PP/SEBS blends showed the smallest rubber droplets regardless of the matrix used. It was seen that SEBS is a more effective toughening agent for PP than SBS. At 0°C the Izod impact strength of the PP‐H/SEBS 30% b/w blend was twofold higher than the SBS strength, with the PP‐R/SEBS 30% b/w blend showing no break. A similar behavior on tensile properties and flexural modulus were observed in both PP/TPE blends. Yield stress and tensile strength decreased and elongation at break increased by expanding the dispersed elastomeric phase in the PP matrix. © 2004 Wiley Periodicals, Inc. J Appl Polym Sci 95: 254–263, 2005     

动态硫化EPDM/PP共混型热塑性弹性体的流动性

研究了动态硫化EPDM／PP共混型热塑性弹性体的流动性。结果表明：选择合适的橡胶及塑料品种、橡塑共混比、软化剂用量及改性剂，可使物理力学性能良好的EPDM／PP共混胶获得较好的流动性。     

动态硫化PP/POE/胶粉热塑性弹性体的性能研究

研究动态硫化聚丙烯(PP)/聚烯烃弹性体(POE)/胶粉热塑性弹性体的性能。结果表明,动态硫化能有效提高热塑性弹性体的物理性能和耐热氧老化性能;炭黑对动态硫化PP/POE/胶粉热塑性弹性体有较好的补强作用,其补强弹性体的再加工性能和热氧老化性能较优。     

不同单体熔融接枝聚丙烯性能研究

采用双螺杆挤出机熔融接枝的方法,研究了多组分体系下不同单体熔融接枝聚丙烯(PP)的性能。结果表明:在共单体苯乙烯、引发剂和PP相同的条件下,接枝物的极性均较未接枝PP的极性增加,不同单体所得接枝物的接枝率不同。不同熔体质量流动速率造成接枝物的加工性能有不同程度的下降。接枝物极性的增加的趋势依次按接枝单体马来酸酐(MAH)、甲基丙烯酸甲酯(MMA)、甲基丙烯酸缩水甘油酯(GMA)递增。这说明GMA接枝聚丙烯对提高PP极性的效果最明显,MMA其次,而MAH则相对较弱。接枝物的偏光显微镜分析发现,接枝支链的生成可以促进PP的异相成核,造成晶粒细化。     

The effect of compatibilizer on the co‐continuity and nanoclay dispersion level of tpe nanocomposites based on PP/EPDM

The effects of different polypropylene (PP)‐g‐maleic anhydride polymers, used as compatibilizers, on the degree of exfoliation and co‐continuity of PP/ethylene‐propylene‐diene terpolymer (EPDM) thermoplastic elastomer (TPE)/clay nanocomposites were investigated. X‐ray diffraction and transmission electron microscopic micrographs showed that nanocomposites ranged from intercalated structure to a coexistence of intercalated tactoids and exfoliated layers. The observed significant increase in crystallization temperature (～20°C) could be beneficial for molding applications, because it means faster solidification and shorter cycle time. The rheological characteristic relaxation time of the compatibilizer correlated with the dispersion level in the nanocomposites. Solvent extraction and gravimetry measurements of continuity showed that compatibilizer affects the co‐continuity composition range through its effect on the dispersion level of nanoclays. At high EPDM concentration, the continuity of the thermoplastic phase for semi‐exfoliated TPE nanocomposites was higher than in the corresponding TPEs. Considering that TPE formation is the first step for thermoplastic vulcanizate production, where the thermoplastic phase should have a certain level of continuity, these results suggest that higher levels of EPDM could be incorporated into the semi‐exfoliated system before losing matrix continuity. It was also observed that there is a direct relation between the magnitude of the normalized stress growth viscosity overshoot and the continuity of TPE nanocomposites. POLYM. ENG. SCI., 2010. © 2010 Society of Plastics Engineers     

相容剂对NBR/PP共混型热塑性弹性体性能的影响

考察了普通氯化聚乙烯（ＣＰＥ）、高氯化ＣＰＥ、马来酸酐接枝聚丙烯及复合氯化聚丙烯（ＣＰＰ）等相容剂对ＮＢＲ／ＰＰ共混体系性能的影响。试验结果表明，复合ＣＰＰ是ＮＢＲ／ＰＰ共混体系的理想相容剂，其最佳用量为６份；以此为相容剂的ＮＢＲ／ＰＰ共混体系具有优良的热塑性，ＮＢＲ／ＰＰ共混型热塑性弹性体可采用热塑性塑料通用的加工方法进行加工。