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。     

炭黑对动态硫化POE/PP热塑性弹性体性能的影响

采用动态硫化法制备POE/PP共混物,研究了过氧化二异丙苯（DCP）对POE/PP体系熔体流动速率（MFR）和力学性能的影响。交联助剂硫磺（S）的加入有效地提高了交联效果,当m（DCP）/m（S）=2/0.2时,体系的综合力学性能最佳。通过不同加工工艺制备POE/PP/炭黑共混物,并研究了炭黑用量对体系力学性能和老化性能的影响。结果表明,母料法制备的共混物更有利于炭黑的分散,体系性能更好,炭黑的加入使体系的耐热老化性和抗紫外性能明显改善。     

Relationship between the rheology and morphology of dynamically vulcanized thermoplastic elastomers based on EPDM/PP

Relationship between the rheological properties and morphology of dynamically vulcanized thermoplastic elastomers (TPVs) based on Ethylene Propylene Diene Monomer (EPDM) and Polypropylene (PP) blends containing 20, 40 and 60% of EPDM were studied. The samples were prepared in a laboratory internal mixer at a rotor speed of 60 rpm. We performed morphological studies on the cryogenically fractured samples using scanning electron microscopy (SEM). The rheological behavior and melt viscoelastic properties of the samples were studied by rheometric mechanical spectrometry (RMS) at a temperature of 220°C. The TPV samples showed a significant viscosity upturn and a strong storage modulus that tended to plateau at low shear rates, with the highest extent for the sample containing 60% of EPDM. These results were attributed to a network structure resulting from agglomerates formed between the cured rubber particles, as evidenced by the morphological features of the samples. The multiple elastic response, expressed in terms of relaxation time distribution, H(λ), exhibited by the molten TPV sample containing 60% of EPDM suggests that apart from the contribution of flow‐induced molecular orientation of the PP matrix, there may also exist some elastic response induced by agglomerates formed between the cured rubber particles. The results predicted from the linear viscoelastic model proposed in the present work were found to be in good agreement with the experimental results. POLYM. ENG. SCI. 45:84–94, 2005. © 2004 Society of Plastics Engineers.     

EPDM/PP热塑性弹性体相态研究

采用透射电镜(TEM)研究动态硫化EPDM/PP热塑性弹性体制备工艺及增容改性对形态结构的影响,研究发现通过添加增容剂可使EPDM相呈颗粒分布于连续相中。     

SBR/PP动态硫化热塑性弹性体的制备及其力学性能的研究

研究了聚丙烯（PP）牌号、橡塑比、硫化体系和不同填料对丁苯橡胶／聚丙烯（SBR／PP）动态硫化热塑性弹性体力学性能的影响。研究结果表明：选用牌号为EPC-30R—H的PP与SBR共混，橡塑比为70／30（质量比），硫磺的用量为1．25份左右（或DCP的用量为1．5份左右），沉淀白炭黑用量为30份，而滑石粉用量为30份时，共混物的综合力学性能较好。     

Effects of crosslinked elastomer particles on heterogeneous nucleation of isotactic PP in dynamically vulcanized EPDM/PP and EOC/PP blends

The isothermal and non-isothermal crystallizations of PP in neat form and in the TPVs EPDM/PP and EOC/PP were investigated using differential scanning calorimetry (DSC). The crystallization of PP was systematically studied by fitting mathematical models, and was later confirmed by X-ray diffraction (XRD) and by scanning electron microscopy (SEM). The experiments revealed that crosslinked elastomer particles first accelerated the primary nucleation of the PP matrix, acting effectively as a nucleating agent that reduces the induction time while increasing the nucleation efficiency. In the secondary nucleation regime (growth of spherulites), the crosslinked elastomer particles enhanced crystal growth rate, reducing the nucleation energy contribution from PP chain folding. Moreover, the crosslinked elastomer particles increased the final thickness of PP lamellae from that of neat PP, and this was corroborated by the XRD results. On comparing the two types of elastomer, it was found that the EOC particles were more effective in heterogeneous cell nucleation than the EPDM particles. The morphological study by SEM revealed completely altered PP spherulite size and shape, as well as their altered distribution, affected by heterogeneous nucleation effects of the crosslinked elastomer particles.     

反应型EPDM/PP热塑性弹性体材料研究

研究EPDM /PP热塑性弹性体配方及结构与性能的关系。结果表明 ,选用门尼粘度为 60的EPDM和熔体流动速率为 7.5 g·( 10min) - 1 的PP作为基料 ,硫化剂DCP用量为 1.2份、反应温度范围为 170～ 175℃时 ,EPDM /PP热塑性弹性体的力学性能和加工性能良好。形态结构研究表明 ,动态硫化强化了EPDM和PP相间的结合 ,有利于产品性能的提高。     

Effect of the compatibilizer on the morphology and properties of dynamically cured PP/POE/epoxy blends

Dynamic vulcanization was successfully applied to epoxy resin reinforced polypropylene (PP)/ethylene‐octene copolymer (POE) blends, and the effects of different compatibilizers on the morphology and properties of dynamically cured PP/POE/epoxy blends were studied. The results show that dynamically cured PP/POE/epoxy blends compatibilized with maleic anhydride‐grafted polypropylene (MAH‐g‐PP) have a three‐phase structure consisting of POE and epoxy particles dispersed in the PP continuous phase, and these blends had improved tensile strength and flexural modulus. While using maleic anhydride‐grafted POE (MAH‐g‐POE) as a compatibilizer, the structure of the core‐shell complex phase and the PP continuous phase showed that epoxy particles could be embedded in MAH‐g‐POE in the blends, and gave rise to an increase in impact strength, while retaining a certain strength and modulus. DSC analysis showed that the epoxy particles in the blends compatibilized with MAH‐g‐PP were more efficient nucleating agents for PP than they were in the blends compatibilized with MAH‐g‐POE. WAXD analysis shows that compatibilization do not disturb the crystalline structure of PP in the blends. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2012     

纳米SiO2对动态硫化EPDM／PP热塑性弹性体性能的影响

在开炼机上采用动态硫化的方法制备纳米SiO2改性三元乙丙橡胶（EPDM）／聚丙烯（PP）共混型热塑性弹性体（TPV）,研究了纳米SiO2的加料顺序和用量对热塑性弹性体的力学性能、维卡软化温度的影响．并对改性后的TPV进行返炼．研究其热塑性能。结果表明：将纳米SiO2先与EPDM混炼均匀．然后加入其它助剂．制得EPDM母炼胶,再与PP共混制备得到的TPV力学性能较好,且纳米SiO2用量为4份时TPV的综合性能最佳;随着纳米SiO2用量的增加,TPV的维卡软化温度升高;返炼后的改性TPV力学性能稍有下降,但具有良好的热塑性。     

动态硫化CR/PVC热塑性弹性体的性能

以CR胶乳和PVC乳液共沉物为原料,通过动态硫化法制成CR/PVC热塑性弹性体.研究了混炼温度和橡塑共混比对CR/PVC共混物力学性能的影响,并通过电镜观察CR/PVC共混物的微观结构.结果表明,在(165±10)℃下制得的CR/PVC共混物的综合性能较好;动态硫化CR/PVC共混物比静态硫化CR/PVC共混物具有更好的力学性能.     

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     

聚丙烯/聚丙烯酸丁酯热塑性弹性体及其对聚丙烯的增韧作用

用傅里叶变换红外光谱、扫描电镜和差示扫描量热计表征了聚丙烯／聚丙烯酸丁酯(PP／PBA)热塑性弹性体的结构和形态。结果表明，PP／PBA热塑性弹性体具有两相分散结构，在制备过程中形成的PP与PBA的接枝共聚物促进了两相之间的分散以及相界面之间的结合。PP／PBA热塑性弹性体在高剪切条件下具有良好的流动性，而且在非极性溶剂中具有较低的溶胀度。PP／PBA热塑性弹性体对PP具有明显的增韧作用。     

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。     

动态全硫化三元乙丙橡胶/聚丙烯共混型热塑性弹性体

综述了动态全硫化三元乙丙橡胶（EPDM）/聚丙烯（PP）共混型热塑性弹性体相结构、性能、加工成型及应用。     

动态硫化热塑性弹性体的制备与应用

阐述了动态硫化共混型热塑性弹性体的发展历史和主要的分类，概述了共混型热塑性弹性体的微观形态结构及其形成机理，总结了共混体系的配方和工艺条件对共混物性能和结构的影响，分析了几种典型动态硫化热塑性弹性体的性能特点和应用领域。     

动态硫化聚氨酯/硅橡胶热塑性弹性体研究进展

从原料选择、加工工艺和增容剂方面总结了动态硫化聚氨酯/硅橡胶热塑性弹性体的研究进展。     

废胶粉/聚丙烯热塑性弹性体的界面增容研究

采取多种相容剂和反应加工手段，设计轮胎胎面废胶粉（WRP）与聚丙烯（PP）体系的不同界面，旨在制备出性能优异的热塑性弹性体（TPE）。研究了纯WRP／纯PP、三元乙丙橡胶（EPDM）包覆WRP／纯PP、丁苯吡橡胶（BSPR）包覆WRP／接枝马来酸酐聚丙烯（MPP）／PP、特殊高分子相容剂（SMC）包覆WRP／纯PP、原位接枝胺基WRP／MPP／PP、动态接枝纯WRP／纯PP等六种体系制备的TPE的性能，WRP／树脂质量比为70／30。结果表明，采用后三种体系制备的TPE性能优良，已经接近天然橡胶／聚丙烯TPE的性能水准，但WRP必须用酚醛树脂进行改性。据此，提出强界面和合适的界面模量过渡是制备废胶粉／树脂热塑性弹性体的关键。TEM的相态研究表明：胶粉的分散粒径在几到十几个微米之间，较原始粒径有很大的细化。     

SEBS对SBR/PP热塑性弹性体增容作用的研究

以氢化苯乙烯-丁二烯-苯乙烯嵌段共聚物（SEBS）作为丁苯橡胶（SBR）/聚丙烯（PP）热塑性硫化胶（TPV）的增容剂,研究增容剂对共混体系的力学性能、共混物硫化交联网络结构、熔融温度以及断面形貌的影响。结果表明,SEBS添加量为6份时,体系的综合力学性能最佳;SEBS的加入提高了有效共硫化程度。增加了体系的化学交联密度;随着SEBS用量的增加,TPV的熔融温度逐渐下降;扫描电镜图片显示SEBS能有效提高界面结合力,提高PP与SBR的相容性。     

动态硫化EPDM/POE制备工艺与性能研究

采用动态硫化的方法制备了三元乙丙橡胶／聚乙烯烃类共聚物(EPDM／POE)热塑性弹性体。初步探讨了动态硫化EPDM／POE的共混温度、硫化剂用量等加工工艺参数对力学性能的影响。其拉伸强度和断裂伸长率随着加工温度的升高而提高；随着剪切速率的提高断裂伸长率增大，拉伸强度先增加后有所下降；提高;EPDM的比例其永久形变降低，同时硬度也下降。     

用聚酯短纤维增强CPE／PVC热塑性弹性体

研究了聚酯短纤维ＴＴ的形状因子、体积分数、取向程度、分散状态及粘合程度对热塑性弹性体ＣＰＥ／ＰＶＣ物化性能的影响。试验结果表明,在ＣＰＥ／ＰＶＣ中定向引入ＴＴ,可有效地提高其物理机械性能和耐老化及耐化学性能。