聚丙烯填充共混物结构与性能的研究

本文研究了ＰＰ／ＢＲ和ＰＰ／ＮＢＲ的ＣａＣＯ３填充共混体系的流变性能、微观结构和机械性能。     

聚碳酸酯与聚乙烯共混物性能的研究

本文研究了聚碳酸酯(简称PC)与聚乙烯(简称PE)共混体系的机械性能、流变性能以及热性能。实验结果表明:PC与PE共混体系是一种具有优异性能的塑料合金材料,这种合金材料具有一定的实用性和经济性。     

聚丙烯／聚乙烯／顺丁橡胶三元共混物研究

本文研究了取乙烯种类及用量、顺丁橡胶用量、共混方式对聚丙烯／聚乙烯／顺丁橡胶三元共混物性能的影响。结果表明，LLDPE增韧效果优于HDPE。顺丁橡胶用量与共混物的缺口冲击强度成正比关系。采用PE与BR先制备增韧母料的二阶共混方式所得共混物的性能最佳。     

SBS与聚丙烯的共混及共混物的性能研究

聚丙烯加工性能优良且生产成本低,但其较低的韧性和较差的冲击性能,在一定程度上限制了其应用。本实验SBS和聚丙烯为原料,经双螺杆挤出机共混制得不同含量SBS的共混物,再对其进行冲击、拉伸等力学性能测试,研究SBS含量对共混物机械性能的影响。实验结果表明:随着SBS用量的增加,共混物的冲击强度不断增大,拉伸强度反而逐渐降低。SBS与聚丙烯共混能有效提高其冲击强度和韧性,但使材料的强度有所下降。当SBS含量为20%时,共混物的综合性能最优。     

聚丙烯／聚乙烯／顺丁橡胶三元共混物研究

本文研究了聚乙烯种类及用量、顺丁橡胶用量、共混方式对聚丙烯／聚乙烯／顺丁三元共混物性能的影响。结果表明,ＬＬＤＰＥ增韧效果优于ＨＤＰＥ。顺丁橡胶用量与共混物的缺口冲击强度成正比关系。采用ＰＥ与ＢＲ先制备增韧母样的二阶共混方式所得共混物的性能最佳。     

PC／PET／Elastomer共混物组成,结构与力学性能的研究

本文研究了ＰＣ／ＰＥＴ／Ｅｌａｓｔｏｍｅｒ共混物的主要力学性能与组成的关系。研究发现当ＰＣ／ＰＥＴ／Ｅｌａｓｔｏｍｅｒ的组成比例为８０／１５￣２５／２￣５时,共混物具有最好的力学性能,良好的加工性,并且表面光滑。     

聚碳酸酯共混物增容改性的研究

综述了近年来聚碳酸酯与丙烯腈－丁二烯－苯乙烯共聚物、聚酯、液晶高分子、聚酰胺和聚烯烃等共聚物的研究现状。采用官能团化大分子作为共混物的相容剂或者作为改性组分是聚碳酸酯共混物改性的主要发展方向，增容聚碳酸酯共混物的分散相尺寸变小、界面粘结加强，物理与力学性能改善。讨论了聚碳酸酯共混物中的增容机理。     

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。     

EPDM／PP共混物的形态结构与性能

用透射电镜分析比较了EPDM／PP共混物硫化前后的形态结构及力学和加工性能,讨论了共混设备、硫化体系对EPDM／PP共混物硫化前后形态结构及力学与加工性能的影响,揭示了共混物形态结构与力学及加工性能的关系。     

Probing toughness of polycarbonate (PC: ductile and brittle)/polypropylene (PP) blends and talc-triggered PC/PP brittle composites with diverse impact fracture parameters

Polycarbonates (PCs) are commonly used as a blend and a composite to achieve pecuniary advantages and dimensional stability. While the toughness of a homogeneous PC matrix has been extensively investigated, examination for the toughness of heterogeneous blend systems such as PC/polypropylene (PP) blends has been limited. Furthermore, recent interest in highly flowable PCs (low-molecular-weight PCs with low ductility) has surfaced due to the large and geometrically complex plastic parts. Herein, the toughness for PC/PP blends and PC/PP/talc composites in a ductile and a brittle PC matrix was explored by using various toughness measurements such as notched Izod impact strength, falling dart impact, boss quasi-static energy/impact energy, and tensile toughness tests. In a ductile PC matrix [melt flow index (MFI) = 8], the incorporation of PP gradually reduced the toughness. On the other hand, the toughness was improved by 450% at 2 wt % PP in a brittle PC matrix (MFI = 19). Similarly, in the talc-induced brittle PC matrix, the toughness was enhanced at the PP loading from 2 to 10 wt %. The density of PC/PP blends was gradually reduced from 1.19 to 1.10 g cm⁻³ with increasing PP concentration from 0 to 20 wt %. Degradation, density, thermal behaviors, and morphology were also investigated. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 136, 47110.     

Morphological,thermal, and mechanical properties of polypropylene/polycarbonate blend

This work deals with the effect of compatibilizer on the morphological, thermal, rheological, and mechanical properties of polypropylene/polycarbonate (PP/ PC) blends. The blends, containing between 0 to 30 vol % of polycarbonate and a compatibilizer, were prepared by means of a twin-screw extruder. The compatibilizer was produced by grafting glycidyl methacrylate (GMA) onto polypropylene in the molten state. Blend morphologies were controlled by adding PP-g-GMA as compatibilizer during melt processing, thus changing dispersion and interfacial adhesion of the polycarbonate phase. With PP-g-GMA, volume fractions increased from 2.5 to 20, and much finer dispersions of discrete polycarbonate phase with average domain sizes decreased from 35 to 3 μm were obtained. The WAXD spectra showed that the crystal structure of neat PP was different from that in blends. The DSC results suggested that the degree of crystallization of PP in blends decreased as PC content and compatibilizer increased. The mechanical properties significantly changed after addition of PP-g-GMA. © 1997 John Wiley & Sons, Inc. J Appl Polym Sci 63: 1857–1863, 1997     

PC／PP／MPP合金体系的力学性能与相态结构

本文介绍以马来酸酐接枝ＰＰ（ＭＰＰ）为相容剂，通过熔融共混的方法制备ＰＣ／ＰＰ合金体系，并研究了配方、力学性能和相态结构之间的关系。由力学性能测试和扫描电镜观察的结果表明，在ＰＣ含量（质量分数，下同）小于５５％时，不含ＭＰＰ样品的冲击强度高于含质量分数（下同）为１０％ＭＰＰ样品的冲击强度；大于５５％时，含１０％ＭＰＰ样品的冲击强度高于同等ＰＣ含量的不含ＭＰＰ样品的冲击强度，其峰值出现在ＰＣ含量为８０％～９０％处。体系拉伸和弯曲强度随ＰＣ含量的变化规律相似，在ＰＣ含量小于５５％时，不含ＭＰＰ样品的拉伸和弯曲强度曲线均出现正峰，而含１０％ＭＰＰ样品出现负峰；当ＰＣ含量大于５５％时，二强度随ＰＣ含量的增加几乎线性地增加，并且含与不含ＭＰＰ样品的变化曲线接近重合。由上述力学性能的变化情况可知，ＭＰＰ对合金的相态结构和力学性能有显著的影响，并随连续相的改变而不同     

Compatibilizing effects for semicrystalline polymer-infiltrated amorphous polymer matrix: Mechanical (toughness), thermal,and morphological behavior of compatibilized polypropylene/polycarbonate blends

Polycarbonates (PCs) have been extensively blended with polyolefins such as polypropylene (PP) due to pecuniary advantages. Although the toughness of a pristine PC matrix has been examined, limited works have investigated the toughness of heterogeneous PC/PP blend systems, focusing merely on PC-dispersed PP matrices. In this study, the mechanical/thermal properties of PP-dispersed PC matrix (PC-rich phase) were examined by using potential compatibilizers: poly(maleic anhydride-alt-α-olefin) (OM), ethylene-co-acrylic acid (EA), and cyclic olefin copolymer. The incorporation of 0.5–5.0 phr of compatibilizers (OM and EA) into PC substantially enhanced the toughness of PC/PP15 blends according to four different testing methods. The highest toughness was obtained with 0.5 phr of OM and EA. The compatibilized blends displayed enhanced various thermal properties such as glass transition temperatures, heat deflection temperature, and degradation point, due to the compatibilizing effect. Moreover, 0.5 phr of compatibilizers (OM and EA) were determined as the most effective concentration in terms of toughness and most properties, without compromising strengths and moduli. The morphology of PP-dispersed PC matrix (crystalline polymer-infiltrated amorphous polymer matrix) differed from that of PC-dispersed PP matrix. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 136, 47684.     

Carbon nanotube/polypropylene/polycarbonate conductive nanocomposite films: Preparation and characterization

In this study, CNT/PP/PC conductive composite films were prepared by compounding PP (polypropylene)/PC (polycarbonate) (1:1) and carbon nanotubes (CNT) using a physical blending and hot pressing method. Next, Fourier transform infrared spectroscopy, thermogravimetric analysis, differential scanning calorimetry, and water contact angle measurement are conducted in order to characterize the properties of CNT/PP/PC conductive films. The results showed there is no chemical reaction inside the PP/PC composite film with the addition of CNT. Neither the CNT composite film containing 3 wt% nor the control film decomposed thermally within 220°C. The water contact angle increased from 88.5° for the control film to 110.99° for the composite film containing 3 wt% CNT. This indicates that the film has good thermal stability and hydrophobic properties. The percolation threshold was obtained when the content of CNT was 3 wt%, and the best conductivity of the CNT/PP/PC composite film was 5.53 S/m at this time. In order to improve the tensile properties of the film, a small amount of polyurethane (TPU) was added to the film, and the maximum tensile strength was 24.91 Mpa when the content of TPU was 6.7%. This study can provide a strategy for the practical application of flexible electronic devices.     

HDPE/AS共混体系形态及力学性能

研究了相容剂ＬＤＰＦ－ｇ－ＡＳ对ＨＤＰＥ／ＡＳ共混体系形态及力学性能的影响。红外光谱研究表明采用固相接枝有效地形成了苯乙烯和丙烯腈与聚乙烯的 支共聚物,将其作为ＨＤＰＥ／ＡＳ共混体系的相容剂可大大减小分散相的粒子尺寸,显著提高共混体秒的力学性能,说明ＬＤＰＥ－ｇ－ＡＳ是该共混体系的有效相容剂。     

马来酸酐接枝聚丙烯增容聚丙烯/碳酸钙复合物力学性能与增容机理

用在50L固相接枝反应器中合成的马来酸酐接枝聚丙烯(PP-g-MAH)作界面改性剂，制备了马来酸酐接枝聚丙烯／聚丙烯／碳酸钙(i-PP／PP-g-MAH／CaCO3)复合材料。研究了i-PP／PP-g-MAH／CaCO3复合材料的力学性能和增容机理。结果表明，PP-g-MAH对i-PP／CaCO3复合物的缺口冲击强度、弯曲强度和拉伸强度均有提高；PP-g-MAH与CaCO3反应形成PP-g-MAH的钙盐，实现反应性增容。     

热处理和放置时间对PP/POE/纳米CaCO3共混物力学性能的影响

通过双螺杆两步挤出法制备了PP／POF／纳米CaCO3共混物。研究了不同热处理时间和热处理温度对试样力学性能的影响,得出共混物热处理的最佳温度为120℃,最佳热处理时间为10min。同时,考察了共混物经过热处理和未经热处理的试样在一定时间的放置中,力学性能随放置时间的变化规律。     

Effect of recycled polypropylene on polypropylene/high‐density polyethylene blends

The effect of recycled PP on incompatible blends of virgin polypropylene (PP) and high‐density polyethylene (HDPE) was studied. Recycled PP from urban solid waste was extracted with methyl ethyl ketone and the compatibilizing action of the product before and after extraction was examined. The characterization of the recycled PP was performed by FTIR, NMR, and DSC analyses. Mechanical properties of the blends were evaluated. The results showed partial compatibility of the blend components, reflected in the improvement of the tensile strength and elongation. Best results were achieved by the addition of extracted recycled PP on the 50/50 PP/HDPE blends. © 2001 John Wiley & Sons, Inc. J Appl Polym Sci 80: 1305–1311, 2001     

相容剂用量对PP/PA11共混物力学性能的影响

研究了相容剂PP-g-MAH用量对PP／PA11共混物力学性能的影响。结果显示,当相容剂质量分数为3％时,体系力学性能最好;同时,偏光显微镜及DSC结果也显示,加入相容剂后,分散相PA11在基体材料PP中的分散更均匀,体系的晶粒尺寸减小。