EPDM／PP共混物性能的研究

研究了三元乙丙橡胶（ＥＰＤＭ）改性聚丙烯共混物的性能,探讨了不同含量的ＥＰＤＭ和ＣａＣＯ３,对共混物的力学性能,热性能,流变性能的影响,获得了性能较好的改性的ＰＰ共混物。     

PP／EPDM共混合金的结构与性能研究

对聚丙烯(PP)／三元乙丙橡胶(EPDM)共混合金的结构与性能进行了研究。结果表明：国产三元乙丙橡胶J3080P能够大幅度提高PP的常温和低温缺口冲击强度；PP基体的性质和EPDM的用量对增韧效果有明显影响。PP／EPDM共混合金发生脆韧转变所需的EPDM用量为20～30份。EPDM对PP增韧机理遵从银纹-剪切带机理。J3080P对PP的增韧效果优于日本产EPDM 501A。     

抗氧剂对PP/EPDM共混物性能和微观结构的影响

采用熔融共混法制备了聚丙烯/三元乙丙橡胶(PP/EPDM)共混物,利用力学性能测试、SEM和TG分析等手段考察了抗氧剂对共混物热氧稳定性、光稳定性、力学性能和微观结构的影响。结果表明:抗氧剂1010和抗氧剂168的加入,提高了PP/EPDM共混物的耐候性,细化了分散相的尺寸,改善了共混物的力学性能。     

EPDM/PP共混物老化性能的研究

研究了三元乙丙橡胶改性聚丙炮共混物的性能,探讨了不同含量的ＥＰＤＭ对共混物的力学性能,热性能、流变性能的影响,还探讨了不同品种,不同含量的抗氧剂对共混物耐老性影响。     

动态硫化对EPDM／PP共混物的影响

研究了动态硫化共混型热塑性弹性体ＥＰＭＤ／ＰＰ，确定了其最佳橡塑化，适合此体系的ＰＰ，硫化剂种类用量，硫化时间，温度。结果表明：最佳橡塑比为６５／３５，硫化时间１０ｍｉｎ，温度为１８０℃，硫化体系以硫磺硫化体系较好，硫化剂用量为１．５份。     

动态硫化PP／HDPE／EPDM三元共混物的流变性能

本文采用不同的硫化剂，不同的硫化时间，对动态硫化的ＰＰ／ＨＤＰＥ／ＥＰＤＭ三元共混物的流变性能进行了研究。结果表明：１共混体系为假塑体，表现出切力变稀现象；２在低剪切应力下，以Ｍ为硫化剂的粘度与纯机械共混体系的粘度有很大差值，此差值随剪切应力的提高迅速减少；３以ＤＣＰ为硫化剂，体系的粘度低于纯机械共混体系的粘度。     

接枝PP／PET共混物的结构与性能

采用PP接枝马来酰亚胺（PP－g-MI)与PET熔融共混，用DSC，PLM，SEM等方法对共混物进行表征，结果表明，随着PP－g-MI接枝率的增加，共混物中PET的冷结晶温度降低，PP－g-MI与PET的相容性较PP与PET的相容性有了大幅度提高，同时PP－g-MI改善了PET的结晶性能，接枝PP在PET连续相中分散均匀，粒子尺寸小，分散相互连续相之间有较好的粘接作用。     

EPDM／PP热塑性弹性体的制备及性能研究

以充油三元乙丙橡胶（ＥＰＤＭ）,粉状聚丙烯（ＰＰ）、超细活性滑石粉为基本材料,采用动态硫化法在单螺杆挤出机组上制备ＥＰＤＭ／ＰＰ共混型热塑性弹性体（ＴＰＶ）;用力学性能试验及动态热流变仪方法测定了ＥＰＤＭ／ＰＰ－ＴＰＶ的性能。结果表明,当ＥＰＤＭ充油量为２０％－３０％时,ＥＰＤＭ与ＰＰ熔融共混效果好;ＤＣＰ用量为１．２％－１．５％时,ＥＰＤＭ／ＰＰ共混体系达到完全动态硫化;超细滑石粉最佳添加量为１     

PP／EPDM共混体系界面的研究

本文采用马来酸酐对三元乙丙橡胶（ＥＰＤＭ）进行熔融接枝改性,将性后的ＥＰＤＭ与聚丙烯（ＰＰ）共混,对ＰＰ／ＥＰＤＭ和ＰＰ／ＥＰＤＭ－ｇ－ＭＡＨ两种共混体系的界面状况进行了对比。运用Ｈｕｇｇｉｎｓ参数、界面张力参数对界面状况进行了表征;运用扫描电镜（ＳＥＭ）和偏光显微镜对共混物的冲击断口形貌以及结晶情况进行了观察与分析;探讨了界面状况与共混物力学性能以及流变性能间的关系。     

PP／BDS共混物的性能

对ＰＰ／ＢＤＳ共混物的性能和微观结构进行了研究。研究结果表明，ＢＤＳ树脂在ＰＰ树脂中具有良好的分散性，二者有一定的相容性。随着ＢＤＳ含量的增加。ＰＰ／ＢＤＳ共混物的光泽度，流动性冲击强度升高，拉伸性能下降，弯曲性能变化较小，与其他增韧剂相比，ＢＤＳ对ＰＰ的增韧性能较好。     

共混时间对反应性PP／EPDM合金性能的影响

通过凝胶含量测定、力学性能试验以及熔体流动性能测试等手段,研究了共混(反应)时间对密炼法和挤出法反应性PP/EPDM共混合金性能的影响及其机理。结果显示,适当延长共混(反应)时间不仅能提高合金中EPDM的交联程度,而且还能使交联EPDM颗粒粒径变小、粒度均匀、在PP连续相中的分布均匀性增加,从而有效地提高该合金的增韧效果及其他力学性能,提高合金的加工流动性。     

The Effect of Dicumyl Peroxide Vulcanization on the Properties & Morphology of Polypropylene/Ethylene-Propylene Diene Terpolymer/Natural Rubber Blends

ABSTRACT

This article discusses some properties such as tensile properties, chemical and oil resistance, gel content, crystallinity, and morphology of polypropylene (PP)/ethylene-propylene diene terpolymer (EPDM)/natural rubber (NR) blends. Dicumyl peroxide (DCP) was applied as a crosslinking agent. In terms of tensile properties, peroxide vulcanized blend shows higher tensile strength and tensile modulus (stress at 100% elongation, M₁₀₀) as compared with the unvulcanized blend. The elongation at break of the peroxide vulcanized blend is higher for the blend with NR rich content compared with the EPDM rich content. The improvements in chemical and oil resistance as well as gel content of peroxide vulcanized blends have also proved the formation of crosslinks in the rubber phase. Scanning electron microscopy (SEM) micrographs from the surface extraction of the blends support that the crosslinks have occurred during dynamic vulcanization. Dynamical vulcanization with DCP has decreased the percent crystallinity of blends that can be attributed to the formation of crosslinks in the rubber.     

丙烯酸接枝聚丙烯对聚丙烯／环氧化三元乙丙橡胶共混体系形态和性能的影响

研究了丙烯酸接枝聚丙烯（PP—g-AA）作为增容剂对聚丙烯（PP）／环氧化三元乙丙橡胶（eEPDM）共混体系形态和性能的影响。结果表明，在以PP为连续相而eEPDM为分散相时，PP—g-AA的加入大大提高了两相间的相容性，导致eEPDM分散相的细化；PP—g-AA中的羧基与eEPDM中的环氧基团发生了化学反应，形成了接枝共聚物，降低了PP／eEPDM之间的界面张力，起到了很好的界面增容剂的作用，对共混体系韧性的提高非常有利。     

基体性质对PP／POE共混物力学性能和形态的影响

采用过氧化二异丙苯（DCP）降解PP／POE共混物。熔体流动速率试验结果表明，当DCP含量从0．2‰（质量分数，下同）增加到1‰时，对应的共混物的熔体流动速率从7．0g／10min增加到17．2g／10min，二者基本成线性关系。并且这种增加（相对分子质量的降低）导致其冲击性能从125J／m下降到50J／m；拉伸实验结果表明，共混物相对分子质量的降低对其屈服应力影响不大，这说明相对分子质量的降低主要是引起基体断裂应力的降低，从而导致共混物的冲击强度大大降低；通过扫描电子显微镜观察了不同相对分子质量共混物中橡胶相的分散情况，结果表明，随着DCP含量的增加，共混物中橡胶相的相区尺寸明显增加。因此，共混物冲击强度的降低是基体相对分子质量降低与橡胶相粒径变化共同作用的结果。     

Mechanical Properties and Morphology of Ternary PP/EPDM/PE Blends

The ternary blends of high‐density polyethylene (PE), EPDM terpolymer and polypropylene (PP) have been used as a model low interfacial tension system to study encapsulation dynamics in ternary blends and their relation to the blends' mechanical properties. It was found that the modulus, tensile strength and impact resistance can be improved by PE addition if the PE is localized within the EPDM phase. A range of blend morphology was found depending on the PE viscosity and polymer incorporation sequence in the twin‐screw extruder. In the most favorable sequence, PE and EPDM were mixed together prior to their dispersion in the PP matrix. This practice resulted in a 50% increase in impact resistance when compared to mixing the three components in a single‐step.     

汽车用三元乙丙橡胶改性聚丙烯

探讨了三元乙丙橡胶（EPDM）增韧聚丙烯的机理,讨论了影响三元乙丙橡胶/聚丙烯共混物韧性、刚性、流变性能、形态结构的因素及它们之间的相互关系,有助于设计和制造应用于汽车上的该种改性材料。     

硫黄硫化EPDM/PP热塑性弹性体相反转及物理性能研究

采用动态全硫化方法制备三元乙丙橡胶(EPDM)/聚丙烯(PP)热塑性弹性体(TPV),研究剪切强度、硫黄用量、促进剂TMTD用量和并用促进剂DM对相反转及TPV物理性能的影响。结果表明:提高剪切强度(转速)有利于相反转发生,但转速过高会使相反转失败,TPV综合物理性能随着转速提高呈现先减小后增大的趋势;适当增大硫黄或促进剂TMTD用量均对TPV的相反转过程产生促进作用,并使反转时间缩短;给定促进剂TMTD用量,硫黄用量对相反转的促进作用存在最佳值,反之亦然;给定硫黄/促进剂TMTD用量,并用促进剂DM会使相反转时间延长甚至失败。     

Flow Behavior of Polypropylene/Ethylene-Propylene Diene Terpolymer/Natural Rubber (PP/EPDM/NR) Blends by Torque Rheometer: The Effect of N,N-m-Phenylene Bismaleimide (HVA-2) Addition

Blends of polypropylene (PP)/ethylene-propylene diene terpolymer (EPDM)/natural rubber (NR) with different ratio were investigated using a Haake torque rheometer. The effect of N,N-m-phenylene bismaleimide (HVA-2) addition on the flow behavior of PP/EPDM/NR blends also was studied. The torque data was collected at different rotor speeds in the range of 30–60 rpm and different processing temperatures in the range of 170–190°C. The recorded data were interpreted in terms of apparent shear rate, apparent shear stress, and apparent viscosity. The shear stress–shear strain curve shows that all blends follow the power law where the pseudoplasticity behavior of melt viscosity increases with increasing NR content as well as addition of HVA-2. The apparent viscosity of the blends was found to increase with increasing NR content in the blend. The addition of HVA-2 increases the apparent viscosity due to the formation of cross-linking in rubber phase. However, blends with HVA-2 show lower flow activation energies than do similar blends without HVA-2. Scanning electron microscopy (SEM) shows good correlation with the flow properties of the blends.     

Dynamically Vulcanized EPDM/PP (40/60) Blends

Dynamically vulcanized thermoplastic elastomer (TPE) blends were first described by Fisher. In the 1960s, the usage of TPE was low. However, the consumption of TPE is increasing today. Due to hard and soft polymer phases in its structure, TPE replaced a lot of materials. TPE materials are preferred today due to their good thermal properties, oxidation resistance, transparency, adhesion, compatibility with other polymers etc. As a result of the studies that were done in 1975, TPV—vulcanized thermoplastic elastomers were developed. In this study, TPV elastomers were produced by forming crosslinks with peroxide from different ratios, of EPDM and PP. Mixing was done with twin screw extruder. After that yield and tensile strength, the modulus of elasticity, % elongation, Izod impact strength, hardness, Melt Flow Index (MFI), Vicat Softening Point, Heat Deflection Temperature (HDT), and density of crosslinks were determined. Thermal transition temperatures and microstructure were determined with DSC and SEM, respectively.