高流动性高韧性PP/POE共混体系材料研究

用聚烯烃弹性体（POE）代替传统的弹性体，对聚丙烯（PP）增韧改性。探讨了基体树脂、POE、高密度聚乙烯（HDPE）、滑石粉、纳米CaCO3以及润滑剂乙撑双硬脂酸酰胺（EBS）的用量对共混体系力学性能和流动性的影响。并通过扫描电镜观察冲击断面，研究共混物的形态结构。结果表明，POE能大幅度地改善材料的冲击韧性，HDPE与POE具有协同增韧效应，加工助剂EBS能改善PP共混材料的流动性，所制得的改性材料可用于制造汽车装饰件。     

POE增韧改性聚丙烯复合材料的制备

用聚烯烃弹性体(POE)代替传统的弹性体,对聚丙烯(PP)增韧改性。探讨了基体树脂、POE和HDPE的用量对共混体系力学性能和流动性的影响。并通过扫描电镜观察冲击断面,研究共混物的形态结构与材料性能的关系。结果表明,POE能大幅度的改善材料的冲击韧性,HDPE具有协同增韧效应,制得的PP改性材料具有高韧性和高流动性。     

新型聚烯烃弹性体增韧聚丙烯的研究

采用茂金属聚烯烃弹性体（POE）代替传统的弹性体,对聚丙烯（PP）增韧改性,并且比较了PP1/POE和PP2/POE两个共混体系的力学性能和流动性。通过偏光显微镜和扫描电镜观察试样,研究共混体系的微观形态与材料性能的关系,结果表明POE对PP晶粒有细化作用,两相相容性较好,POE能显著提高PP的冲击韧性。     

高流动性PP增韧体系流变性能的研究

利用毛细管流变仪和转矩流变仪对高流动性聚丙烯（PP）增韧体系的流变性能进行分析,讨论了聚烯烃弹性体（POE）、三元乙丙橡胶（EPDM）=增韧母料和降温母料等助剂对高流动性PP共混体系流变性能的影响,并对PP/POE共混体系和PP/EPDM共混体系的转矩流变曲线进行了对比,考察了不同共混体系的微观结构、力学性能和加工性能。     

非对称同向双螺杆挤出机加工PP/HDPE/POE共混复合材料的研究

首先分别采用两种不同的同向双螺杆挤出机(新型非对称同向双螺杆挤出机以及传统双螺杆挤出机),制备了聚丙烯/高密度聚乙烯(PP/HDPE)共混复合材料,通过试样力学性能以及微观结构形貌对其加工过程进行了表征。然后采用新型非对称同向双螺杆挤出机进一步制备出了PP/聚烯烃弹性体(POE)、PP/HDPE/POE共混复合材料,分析了HDPE及POE用量对复合材料力学性能的影响,并采用扫描电子显微镜(SEM)观察了共混复合材料的表面微观结构形貌。结果表明:新型非对称同向双螺杆挤出机具备更好的分布、分散混合能力,所加工共混复合材料的分散相颗粒粒径分布更加集中,粒径也更小;HDPE和POE对PP有良好的协同增韧作用,当PP、HDPE、POE的质量比为68:17:15时,PP/HDPE/POE共混体系的综合性能最佳。     

聚丙烯共混改性体系力学性能研究

首先分别采用乙烯-辛烯共聚物弹性体(POE)、有机改性的天然累托石粘土(OREC)与经过表面处理的两种晶须：硼酸铝、钛酸钾与均聚聚丙烯(PP)进行二元熔融共混改性，其次采用两种改性剂对PP进行三元共混改性。结果表明：弹性体虽能增加聚丙烯的韧性，但是其拉伸强度有相当大下降，粘土虽能同时提高聚丙烯的韧性与强度，但是增韧的幅度有限，晶须增强、增韧效果较差。POE与OREC对PP有协同增强增韧作用，三元共混体系POE／OREC／PP在适当配比时的力学性能有较大幅度的改善，其冲击性能比纯PP提高204．％，比二元体系POE／PP提高15．6％，拉伸强度比纯PP下降15．6％，比二元体系POE／PP提高22．6％。     

PP/POE共混物的形态和性能的研究

采用聚烯烃弹性体(POE)对聚丙烯(PP)进行增韧改性，研究了共混物的力学性能、热性能、断裂功和微观形态。结果表明：POE在PP基体中分散均匀，与基体树脂结合良好；随POE用量的增加，弹性体粒子尺寸不变仅数量增多；POE不仅可以提高材料的冲击韧性也可提高其断裂韧性；POE的加入使材料的软化点略有下降，对加工性能的影响较小。     

橡胶与弹性体增韧改性聚丙烯的研究进展

从橡胶、弹性体对聚丙烯(PP)进行增韧的机理出发,介绍了当前国内外研究较多的PP/橡胶与PP/弹性体二元共混物及其三元共混物。综述了采用具有不同结构的橡胶与弹性体、相容剂增容共混物以及无机材料协同弹性体对PP进行增韧改性的研究进展,同时也从共混加工工艺上对橡胶与弹性体增韧PP进行了阐述,分析了复合材料的综合性能,并对今后国内外增韧改性PP提出了展望。     

POE/HDPE/PP三元复合材料的形貌和力学性能研究

用熔融共混法制备了高密度聚乙烯/聚丙烯(HDPE/PP)和乙烯-辛烯弹性体/高密度聚乙烯/聚丙烯(POE/HDPE/PP)复合材料。通过冲击、弯曲和拉伸测试研究了复合材料的力学性能,采用扫描电镜(SEM)观察了材料的形貌。结果表明,由于HDPE和PP的相容性有限,限制了HDPE对PP综合力学性能的提高;通过添加POE,能改善HDPE/PP共混物的相容性,使HDPE/PP复合材料在保持较高弯曲和拉伸性能的前提下,抗冲击性能获得明显提高。当HDPE/PP的含量比为12/88和POE含量为8wt%时,POE/HDPE/PP三元复合材料的综合力学性能较好。     

PP/POE及PP/EPDM共混改性研究

以茂金属聚烯烃弹性体(POE,乙烯-辛烯共聚物)和三元乙丙橡胶(EPDM)作为聚丙烯(PP)的增韧剂,研究了PP/POE及PP/EPDM共混物的加工性能及力学性能。研究结果表明,POE在加工性、增韧改性等方面比EPDM更具有优势。借助扫描电子显微镜(SEM)进一步探讨了共混物的形态结构与性能的关系。     

Study on the mechanical and morphological properties of toughened polypropylene blends for automobile bumpers

Studies on the use of polyolefin elastomer (POE) and high density polyethylene (HDPE) for toughening polypropylene (PP) to meet the demands of automobile bumpers were conducted. The effect of the basic resin, POE and the influences of the POE amount and HDPE doses on the mechanical properties of the blended composites were discussed. The morphology of impact fracture sections were characterized by scanning electron microscopy (SEM) while the crystalline properties were investigated by DSC. The effect of the composites’ morphology on mechanical properties was also discussed. Results showed that POE could improve the impact strength of PP while the use of HDPE had obvious effects on synergistic toughening. SEM images and DSC data analysis testified to the relationship between morphology, crystallinity and the mechanical properties.     

Structure and properties of PP/POE/HDPE blends

This work was aimed to counteract the effect of ethylene‐α‐olefin copolymers (POE) by reinforcing the polypropylene (PP)/POE blends with high density polyethylene (HDPE) particles and, thus, achieved a balance between toughness and strength for the PP/POE/HDPE blends. The results showed that addition of HDPE resulted in an increasing wide stress plateau and more ductile fracture behavior. With the increase of HDPE content, the elongation at break of the blends increased rapidly without obvious decrease of yield strength and Young's modulus, and the notched izod impact strength of the blends can reach as high as 63 kJ/m² at 20 wt % HDPE loading. The storage modulus of PP blends increased and the glass transition temperature of each component of the blends shifted close to each other when HDPE was added. The crystallization of HDPE phase led to an increase of the total crystallinity of the blend. With increasing HDPE content, the dispersed POE particle size was obviously decreased, and the interparticle distance was effectively reduced and the blend rearranged into much more and obvious core‐shell structure. The fracture surface also changed from irregular striation to the regularly distant striations, displaying much obvious character of tough fracture. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2011     

HDPE增韧PP-R/石墨复合材料力学性能的研究

采用高密度聚乙烯(HDPE)为增韧剂、乙烯 丙烯 二烯三元共聚物(EPDM)、乙烯 辛烯共聚物(POE)为相容剂、石墨为功能性助剂制备了以无规共聚聚丙烯(PP R)或嵌段共聚聚丙烯(PP B)为基体的PP R或PP B／HDPE／石墨复合材料。详细研究了HDPE含量、弹性体种类及含量对PP R或PP B／HDPE／石墨复合材料力学性能的影响。结果表明HDPE用量在20%、EPDM含量为5%时,PP R或PP B复合材料力学性能优异;POE可以实现PP R或PP B／HDPE／石墨复合材料力学性能的平衡。     

轻质碳酸镁/聚合物复合材料的研制

采用硬脂酸对轻质碳酸镁进行表面改性,再将改性后的轻质碳酸镁分别加入PP和HDPE中,制备出相应的轻质碳酸镁/PP和轻质碳酸镁/HDPE复合材料。为改善复合材料的力学性能,将POE加入到轻质碳酸镁/PP和轻质碳酸镁/HDPE复合材料中,制备出相应的轻质碳酸镁/PP/POE和轻质碳酸镁/HDPE/POE复合材料。探讨了硬脂酸用量、改性温度、改性时间对改性效果的影响。测定了改性轻质碳酸镁的沉降体积、吸油值和活化度并用红外光谱和热失重进行表征。最终确定了最佳改性条件。硬脂酸用量为2%,改性时间为50 min,改性温度为75℃。     

聚醚钛酸酯合成及其对聚烯烃/CaCO_3力学性能影响

将一定比例聚醚和异辛醇相混合,采用传统的Moor等反应方法制得了具有不同相对分子质量的聚醚基异辛基焦磷酸酯,再与钛酸异丙酯反应,获得异丙基三(聚醚基异辛基焦磷酰氧基)钛酸酯。经此偶联剂处理的CaCO3对于HDPE/CaCO3和PP/POE/CaCO3材料具有明显增韧、增强作用。对PVC/CPE/DOP/CaCO3材料也具有明显改善韧性的作用。经SEM测定表明,经此偶联剂处理的CaCO3与聚合物基体间的界面较模糊。偶联剂中聚醚取代基的相对分子质量和合成原料中聚醚与异辛醇的比例对材料增韧效果具有重要影响。     

Synergistic toughening effects of nucleating agent and ethylene–octene copolymer on polypropylene

The synergistic toughening effect of nucleating agent (NA) and ethylene–octene copolymer (POE) on polypropylene was studied in the present work. Two different nucleating agents, such as α-form nucleating agent 1,3 : 2,4-bis (3,4-dimethylbenzylidene) sorbitol (DMDBS, Millad 3988) and β-form nucleating agent aryl amides compounds (TMB-5), were selected to blend with PP or PP/POE blends, respectively. The results show that PP containing 0.5–0.25 wt % DMDBS or 0.5–0.25 wt % TMB-5 has relatively low impact strength. For PP/POE blends, although the impact strength increases gradually with the increasing of POE content, high content of POE is needed to obtain the available PP toughness. However, once nucleating agent and POE are simultaneously added into PP, PP/POE/NA blends show great improvement of toughness even at low POE content. Furthermore, the synergistic toughening effect of POE/TMB-5 is more apparent than that of POE/DMDBS. SEM results show that whether DMDBS or TMB-5 has no apparent effect on the morphologies of POE in the PP/POE/NA blends. Further investigations using DSC and POM indicate that both DMDBS and TMB-5 induce the apparent enhancement of the crystallization temperature of PP and the sharp decrease of spherulites size of PP in the PP/POE/NA blends. The possible synergistic toughening mechanism is discussed in the work. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci, 2008     

新型热塑性弹性体增韧聚丙烯的研究

以聚烯烃弹性体(POE,乙烯-辛烯共聚物)为PP的增韧性剂,利用转矩流变仪、差示量热扫描(DSC)及力学性能测试方法,比较研究了PP/POE及PP/EPDM共混物的加工性能、结晶性能及力学性能;结果表明,POE在加工性、改性效果等方面比EPDM更具优势。还探讨了POE用量对PP/CaCO