聚丙烯／三元乙现橡胶共混体系的研究

研究了三元乙丙橡胶（ＥＰＤＭ）对聚丙烯（ＰＰ）结晶行为的影响以及ＰＰ／ＥＰＤＭ共混物的形态与性能的关系。ＥＰＤＭ对ＰＰ的熔点、结晶温度无明显影响，ＰＰ／ＥＰＤＭ共混物的结晶度随ＥＰＤＭ组份含量的增加而降低，适量的ＥＰＤＭ可使ＰＰ的晶体尺寸减小，晶胞参数与组份比无关。当ＥＰＤＭ用量为３０％￣４０％时，共混物的冲击强度迅速提高。     

用顺酐化EPDM增容的EPDM改性聚甲醛

以顺酐化三元乙丙橡胶（ＭＥＰＤＭ）为增容剂，研究了ＥＰＤＭ对聚甲醛（ＰＯＭ）的共混增韧生。结果表明，ＭＥＰＤＭ能明显改善ＰＯＭ与ＥＰＤＭ的相容性，使共混物分散相尺寸明显减少，分布更均匀，熔点和结晶度降低，缺口冲击强度提高。当ＰＯＭ／ＥＰＤＭ／ＭＥＰＤＭ（质量比）为８５／９／６时，共混物的缺口冲强度为１０．２ｋＪ／ｍ＾２。     

PP／EPDM／云母共混复合材料的研究

冲击强度和弯曲模量是聚丙烯共混材料中存在的一个矛盾，通过ＰＰ／ＥＰＤＭ／云母三元共混得一以具有高冲击强度和高弯曲模量的硬而韧的复合材料，并将其用于汽车塑料件中。本文研究了ＰＰ／ＥＰＤＭ／云母的共混物配方、共混体系中ＥＰＤＭ和云母含量与冲击强度和弯曲模量间的关系，分析了云母的表面处理及ＰＰ／ＥＰＤＭ／云母材料断面ＳＥＭ照片，提出了该材料的结构形态模型。     

EPDM/聚烯烃共混型热塑性弹性体的研究

制备ＥＰＤＭ／聚烯烃简单共混型热塑性弹性体。研究了聚合物种类、橡塑比、二元和三元共混对共混物力学性能的影响。结果表明，部分结晶性ＥＰＤＭ共混物的力学性能比无定形ＥＰＤＭ共混物好，部分结晶性ＥＰＤＭ与ＬＤＰＥ（低密度聚乙烯）共混物的拉伸强度大于两者的加和值，而其它二元共混物的拉伸强度均低于两共混单元的加和值；用ＬＤＰＥ部分替代ＰＰ，或用氯磺化聚乙烯（ＣＳＭ）部分替代结晶性ＥＰＤＭ进行三元共混，能改善部分结晶性ＥＰＤＭ／ＰＰ共混物的某些性能。     

聚丙烯/三元乙丙橡胶共混体系的研究

研究了三元乙丙橡胶（ＥＰＤＭ）对聚丙烯（ＰＰ）结晶行为的影响以及ＰＰ／ＥＰＤＭ共混物的形态与性能的关系。ＥＰＤＭ对ＰＰ的熔点、结晶温度无明显影响,ＰＰ／ＥＰＤＭ共混物的结晶度随ＥＰＤＭ组份含量的增加而降低,适量的ＥＰＤＭ可使ＰＰ的晶体尺寸减小,晶胞参数与组份比无关。当ＥＰＤＭ用量为３０％～４０％时,共混物的冲击强度迅速提高。     

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。     

PA－66／（PE／EPDM）－g－MAH共混增韧的研究

本文研究了尼龙－６６（ＰＡ－６６）与聚乙烯（ＬＤＰＥ）共混物的力学性能。结果表明，用马来酸酐接枝聚乙烯和三元乙丙橡胶（ＥＰＤＭ）改善了与基体ＰＡ－６６的相容性。添加弹性体ＥＰＤＭ，使之生成（ＰＥ／ＥＰＤＭ）－ｇ－ＭＡＨ共聚物，可以大幅度度地提高ＰＡ－６６／（ＰＥ／ＥＰＤＭ）－ｇ－ＭＡＨ冲击强度，同时熔体粘度随温度的变化趋于平缓，吸水率有所下降。     

动态硫化EPDM／PP热塑性弹性体相态结构及其力学行为

研究动态硫化ＥＰＤＭ／ＰＰ热塑性弹性体相态结构及其力学行为。结果表明：动态硫化ＥＰＤＭ／ＰＰ共混物相态是ＥＰＤＭ橡胶以颗粒状分布在ＰＰ连续相中,这种相态结构一般不随橡塑比的变化而改变,但ＥＰＤＭ橡胶颗粒的形态变化显著。动态硫化ＥＰＤＭ／ＰＰ共混物,在橡塑比小于２５／７５,共混物具有类似橡胶应力－应变特征。     

PA—66／（PE／EPDM）—g—MAH共混增韧的研究

本文研究了尼龙－６６（ＰＡ－６６）与聚乙烯（ＬＤＰＥ）共混物的力学性能。结果表明，用马来酸酐接枝聚乙烯和三元乙丙橡胶（ＥＰＤＭ）改善了与基体ＰＡ－６６的相容性。添加弹性体ＥＰＤＭ，使之生成（ＰＥ／ＥＰＤＭ）－ｇ－ＭＡＨ共聚物，可以大幅度地提高ＰＡ－６６／（ＰＥ／ＥＰＤＭ）－ｇ－ＭＡＨ冲击强度，同时熔体粘度随温度的变化趋于平缓，吸水率有所下降。     

EPDM分布形态对动态硫化PP/EPDM共混物增韧效果的影响及其机理的研究

采用扫描电子显微镜（ＳＥＭ）技术研究了乙烯质量分数分别为０５３,０４５和０７５的３种ＥＰＤＭ与ＰＰ组成的动态硫化共混物的形态结构特征及其增韧效果。结果表明,当ＥＰＤＭ中乙烯质量分数在０４５～０５５之间时,ＥＰＤＭ的结构规整性差、熔融粘度高、与ＰＰ相容性小,动态硫化的实质是使ＥＰＤＭ分散颗粒由大变小、粒度均化、分布均匀,增大共混剪切强度有利于提高这种ＥＰＤＭ的增韧效果。当ＥＰＤＭ中乙烯质量分数达到０７５时,ＥＰＤＭ中因出现均聚ＰＥ序列结构而呈现部分结晶性,熔融粘度低,与ＰＰ相容性增大,动态硫化后ＥＰＤＭ分散颗粒由小变大,并同时形成“亚网结构”,强化化学交联反应可提高网络密度及网络连续性,从而提高增韧效果,而提高共混剪切强度,反而会使增韧效果下降     

PP/EPDM/纳米弹性体粒子三元共混体系的脆韧转变

研究了PP／EPDM／纳米弹性体粒子(ENP)三元共混体系的脆韧转变行为。结果表明，与PP／EPDM二元共混物相比，三元共混物的脆韧转变可以在EPDM质量分数较低的情况下发生；在橡胶总质量分数相同的情况下，三元共混物有更高的冲击强度，拉伸强度有一定提高。从脆断样条的扫描电镜照片观察到，在相同EPDM质量分数下，PP／EPDM／ENP三元共混物中的EPDM粒子明显细化，分布均一，粒子间距减小，这是脆韧转变提前的原因。     

聚丙烯轿车专用料的光老化和光稳定

介绍了用于轿车保险杠的ＰＰ／ＰＥ／ＥＰＤＭ共混物的氙灯人工加速老化及户外暴露实验结果，分析了不同抗老化体系对ＰＰ／ＰＥ／ＥＰＤＭ共混物光老化后拉伸性能、冲击性能及外观变化的影响。     

高韧性和高流动性PP／EPDM共混材料的研制

研究了乙丙橡胶的门尼粘度和结晶性对聚丙烯增韧效果的影响，结果表明，高门尼粘度，部分结晶性橡胶在获得较好韧性的同时不保持较高的刚性，但流动性较差，通过加入ＨＤＰＥ能在复合增韧的同时提高共混物的流动性，添加少量油酸酰胺和硬脂酰胺敢能适当提高共混物的流动性，采用过氧化物降解聚丙烯可以显著提高共混物的流动性，但韧性明显下降，采用可控降解和动态硫化相结合的技术是在得到高韧性，高流动性共混ＰＰ的有效途径。     

Compatibilization and properties of SAN/EPDM blends with the addition of coagents

SAN and EPDM are not miscible. In this work, the dry blending of SAN and EPDM using Centrex (acrylonitrile/EPDM/styrene graft copolymer) and EPMMA (EPDM‐g‐Mah) as coagents was studied. Centrex content was used at 6–20 wt %. EPMMA content in the mixture was 20 wt %. The effects of coagent type and content on the mechanical properties and morphology were investigated. SEM micrographs of SAN/EPDM/Centrex and SAN/EPDM/EPMMA blends showed that both Centrex and EPMMA have an effective role in forming a finer morphology. For the ternary blends, the addition of coagent resulted in a significant reduction in the size of the dispersed phase. The mechanical properties of SAN/EPDM/coagent blends were improved significantly in comparison to the simple SAN/EPDM blends. SAN/EPDM/Centrex blends showed higher stress‐at‐break and SAN/EPDM/EPMMA blends showed higher impact strength. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci, 2008     

High-performance EPDM/organoclay nanocomposites by melt extrusion

Ethylene-propylene-diene terpolymer (EPDM)/organoclay nanocomposites were prepared by melt extrusion in a twin-screw extruder. The organoclay was characterized by XRD and TGA. As observed by transmission electron microscopy (TEM), the organoclay particles were exfoliated in EPDM. The tensile strength of the nanocomposites increased to 12.3 MPa at the same 3.0 phr amounts of fillers, which was a five-fold increase compared to pure EPDM and 2.8 times compared to the nanocomposite prepared by direction blending; furthermore it was above that of carbon black composites with 15.0 phr. The results of co-reinforcement system exploited a promising application prospect of the organoclay and the nanocomposites. The processability of the terpolymer was improved as a result of the decrease of mooney viscosity; the improvement of the thermal stability of the nanocomposite was determined by TGA.     

Solution maleation of EPDM and blending of acetal copolymer with rubber using maleated EPDM as compatibilizer

Maleation of EPDM in xylene solution using dibenzoyl peroxide as initiator at the boiling point of solution was studied. Effects of amounts of dibenzoyl peroxide and maleic anhydride (MAH), reaction time and temperature, as well as the concentration of EPDM on the bond MAH content of the product were investigated. The results showed that by optimization of the maleation conditions, maleated product with high bond MAH content up to 20 wt % can be obtained without gelation. The maleated EPDM (MEPDM) was utilized in the blending of acetal copolymer and rubber such as EPDM or cis-1,4-polybutadiene. Both the impact strength and the tensile strength of the blends increased when a certain amount of MEPDM was added. Decrease of crystallinity of acetal copolymer in the blends determined by wide angle X-ray diffraction and morphology of the blends examined by scanning electron microscope demonstrated the action of MEPDM as compatibilizer. © 1997 John Wiley & Sons, Inc. J Appl Polym Sci 64: 329–335, 1997     

The Effect of Vibration on Mechanical Properties of Blends of EPDM/PP in a Tri-screw Dynamic Mixing Extruder

The effects of vibration force field on mechanical properties of blends of EPDM/PP during process of plastics in tri-screw dynamic mixing extruders were investigated experimentally. It was found that vibration force field enhanced mechanical properties of blends of EPDM/PP, and the amplitude of enhancement varied as EPDM content varying. The yangs modulus, the impact strength and the tensile strength were improved the maximum 17, 28, and 17.3%, respectively under dynamic conditions than that under steady conditions. Mechanical properties of blends of EPDM/PP represented a tendency of a rising followed by a fall with the increase of vibration frequency and amplitude.