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综述了近些年聚丙烯(PP)/玻璃微珠(GB)复合材料的力学性能、动态力学性能、流变性能、结晶性能以及其他性能等的最新研究进展。与纯PP相比,PP/GB复合材料的拉伸和弯曲强度显著提高;GB经硅烷偶联剂表面处理后,PP/GB复合材料的拉伸和弯曲强度进一步提高;GB的加入使PP/GB复合材料的储能模量和损耗模量非线性增大。由于GB具有滚珠轴承效应,一定量的GB可以提高PP熔体的流动性;GB还可以提高复合材料的玻璃化转变温度、负荷变形温度、结晶度及结晶温度;PP/GB复合材料的制备工艺中,双螺杆挤出工艺的塑化效果要优于单螺杆挤出工艺。 相似文献
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纳米碳酸钙改性聚丙烯力学性能及微观形态的研究 总被引:3,自引:0,他引:3
利用双螺杆挤出机制备了均聚聚丙烯(PP)/活性纳米碳酸钙(nano-CaCO3)复合材料,并用注射机注射了标准拉伸、弯曲及冲击样条。研究了不同nano-CaCO3质量分数(1%~8%)对复合材料力学性能的影响,利用扫描电镜观察了复合材料冲击断面的形貌及nano-CaCO3的分散情况。结果表明,与纯PP相比,加入nano-CaCO3后,复合材料的拉伸强度有所降低,而弯曲强度、弯曲模量呈增加趋势,简支梁、悬臂梁冲击强度呈先增加后减小的趋势。 相似文献
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应用双螺杆挤出机制备了聚丙烯(PP)/聚烯烃弹性体(POE)共混体系和PP/POE/纳米碳酸钙(nano-CaCO3)复合体系,研究了POE用量及nano-CaCO3对PP冲击性能、拉伸性能及弯曲性能的影响。结果表明,随着POE用量的增加,PP/POE共混体系及PP/POE/nano-CaCO3复合体系的冲击强度明显增加;拉伸强度及拉伸模量、弯曲强度及弯曲模量均减小;断裂伸长率及断裂强度亦减小。此外,与PP/POE共混体系相比,PP/POE/nano-CaCO3复合体系的冲击强度、拉伸强度及拉伸模量、弯曲强度及弯曲模量均优于PP/POE共混体系。 相似文献
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PP/POE共混物力学性能研究 总被引:2,自引:1,他引:1
用双螺杆挤出机制备了聚丙(烯PP)/聚烯烃弹性(体POE)共混物,研究了POE用量对PP/POE共混物冲击性能、拉伸性能及弯曲性能的影响。结果表明:随着POE含量的增加,PP/POE共混物的冲击强度明显提高;拉伸强度及拉伸模量弯、曲强度及弯曲模量、断裂伸长率及断裂强度均减小。 相似文献
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花生壳粉/聚丙烯复合材料的研究 总被引:2,自引:0,他引:2
黄兆阁 《现代塑料加工应用》2005,17(2):30-32
利用双螺杆挤出工艺对花生壳粉填充改性聚丙烯(PP)进行了研究。结果表明。加入花生壳粉后.复合材料的弯曲强度、硬度、维卡软化温度、拉伸强度和断裂伸长率均有所提高。但其加工流动性能和冲击强度有所下降。在花生壳粉含量为30%时,复合材料的综合性能较优。 相似文献
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To determine the possibility of using starch as biodegradable filler in the thermoplastic polymer matrix, starch‐filled polypropylene (PP) composites were prepared by extrusion of PP resin with 5, 10, 15, and 20 wt % of potato starch in corotating twin‐screw extruder. The extruded strands were cut into pellets and injection molded to make test specimens. These specimens were tested for physicomechanical properties such as tensile and flexural properties, Izod impact strength, density, and water absorption. These PP composites were further characterized by melt flow index (MFI), vicat softening point (VSP), differential scanning calorimetry (DSC), and thermogravimetric analysis (TGA) techniques. It was found that, with increase in starch content, tensile modulus, flexural strength, and flexural modulus of the PP composites increased along with the increase in moisture, water absorption, and density, while retaining the VSP; but, tensile strength and elongation, impact strength, hardness, and MFI of the PP composites also decreased. DSC analysis of the PP composite revealed the reduction in melting temperature, heat of fusion, and percentage of crystallization of PP with increase in starch content. Similarly, TGA traces display enhanced thermal degradability for PP as starch content increases. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2011 相似文献
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Some results of experiments on the mechanical and rheological properties of mineral filled polypropylene were presented. Single filler and hybrid filler composites of talc and calcium carbonate (CaCO3) were prepared in a co‐rotating twin‐screw extruder. The effect of filler type, filler content, and coupling agent on the mechanical and rheological properties of the polypropylene were studied. The coupling agent was maleic anhydride‐grafted polypropylene (PP‐g‐MA). It was found that the mechanical properties are affected by filler type, filler concentration, and the interaction between filler and matrix. The tensile strength of the composite is more affected by the talc while the impact strength is influenced mostly by CaCO3 content. The elongation at break of PP/CaCO3 composites was higher than that of PP/talc composites. The incorporation of coupling agent into PP/mineral filler composites increased the mechanical properties. Rheological properties indicated that the complex viscosity and storage modulus of talc filled samples were higher than those of calcium carbonate filled samples while the tan δ was lower. The rheological properties of hybrid‐filler filled sample were more affected by the talc than calcium carbonate. The PP‐g‐MA increased the complex viscosity and storage modulus of both single and hybrid composites. POLYM. COMPOS., 2009. © 2009 Society of Plastics Engineers 相似文献
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Mechanical properties and morphologies of polypropylene with different sizes of glass bead particles
A commercial grade of isotactic polypropylene (PP) was used to study the mechanical properties and morphologies of the PP composites filled with four sizes of glass bead particles. The glass bead particles used were with average particle sizes of 15 μm (GB15), 10 μm (GB10), 5 μm (GB5), and 2.5 μm (GB2.5), respectively. It was clear that the glass bead size was an important factor on the determination of mechanical properties of the composites. As a whole, in view of the scatter in the data, under the condition of same filler content, the yield strength and impact strength of the composites filled with smaller glass bead particles was higher than those of the composites filled with bigger ones. And the flexural strength and modulus of the composites filled with GB10, GB5, or GB2.5 particles could be regarded as the same. The flexural strength and modulus of the composites filled with GB15 particles were higher than those of the composites filled with other three sizes of particles. Among four sizes of glass bead particles, GB2.5 had the best toughening effect to improve the impact strength of PP matrix. And the major toughening mechanism of the PP/GB2.5 composites was the pinning effect introduced by GB2.5. POLYM. COMPOS., 2008. © 2008 Society of Plastics Engineers 相似文献
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Azman Hassan Mat Uzir Wahit Ching Yern Chee 《Polymer-Plastics Technology and Engineering》2013,52(7):1245-1256
In this study, impact-modified polypropylene (PP) ternary blends based on PP/natural rubber (NR)/linear low-density polyethylene (LLDPE) with ratios of 72/10/18 and 64/20/16 were produced by a twin-screw extruder with polyoctenamer (TOR) as the compatibilizer. The mechanical properties of the blends were determined on injection-molded specimens in tensile, flexural, and impact testing. The impact strength and elongation at break of the blend increased significantly while the flexural modulus and tensile strength decreased slightly with increasing TOR content. The impact strength improved with the increasing TOR due the increase of interfacial adhesion resulting in finer dispersion of the rubbery minor phase in the PP matrix. The improvement in compatibility with the addition of TOR into PP/NR/LLDPE blends is being supported by both scanning electron microscopy (SEM) and dynamic mechanical analysis (DMA). 相似文献
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Münir Taşdemir Gerard T. Caneba Rajesh Tıwarı Bo Wang 《Polymer-Plastics Technology and Engineering》2013,52(10):1064-1070
In this article, supercritical carbon dioxide (scCO2) is used to form a high density microcellular foam structure to reduce the polymer use and facilitate dispersion of Mg(OH)2 and Nanoclay fillers. A twin-screw extruder system was used to predistribute the inorganic filler from the PP polymer, resulting composite PP/filler pellets. This followed by the use of a single-screw extruder wherein supercritical carbon dioxide is introduced in the formulation. Finally the resulting foam PP/filler/CO2 pellets are injection molded into test samples. The structure and properties of the composites are characterized using a scanning electron microscopy (SEM), Differential scanning calorimetry (DSC), and density measurements. Furthermore, PP/Clay/Mg(OH)2 polymer composites are subjected to examinations to obtain their yield and tensile strengths, elasticity modulus, % elongation, Izod impact strength, hardness, Heat deflection temperature (HDT), Vicat softening point and Melt flow index (MFI). 相似文献
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采用小粒径玻璃微珠(OB)与聚丙烯(PP)熔融共混,研究了GB含量及表面处理对复合材料拉伸性能及介电性能的影响。研究结果表明,与未经表面改性的GB相比,经过偶联剂KH-550和EB-151处理的GB与PP复合后,其拉伸性能得到明显改善;且当GB含量为20%时,经过KH-550处理的GB/PP复合材料的拉伸强度、断裂伸长率和拉伸弹性模量比纯PP的分别提高了8.7%、109.6%和187.0%;复合材料的介电常数随GB含量的增加呈现增大的趋势,经过改性的复合材料的介电常数比未经改性的有所增加,而GB的含量和界面改性对介电损耗的影响不大。 相似文献
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聚丙烯/纳米碳酸钙复合材料性能的研究 总被引:1,自引:0,他引:1
利用双螺杆挤出机制备了聚丙烯(PP)/活性纳米碳酸钙(nano-CaCO3)复合材料,并用注射机注射了标准拉伸、弯曲及冲击样条。研究了不同纳米碳酸钙质量含量(1%~8%)对复合材料流动性能及力学性能的影响,利用扫描电镜观察了复合材料冲击断面的形貌。研究结果表明在实验范围内,与纯PP相比,加入纳米碳酸钙后,复合材料的拉伸强度有所降低,而弯曲强度、冲击强度以及硬度增加。当纳米碳酸钙含量为3%时复合材料呈现比较好的综合性能。实验条件下,纳米碳酸钙对复合材料的流动性能影响不大。 相似文献