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本文通过不同直径的S_2玻纤的单纤、纱线和纤维增强复合材料的力学性能的对比试验表明,200孔漏板拉制的40支/10股和100孔漏板拉制的80支/20股无捻粗纱及其增强的环形复合材料具有等同的力学性能;200孔漏板拉制的15支/2股、20支/3股和30支/4股无捻粗纱增强的环形复合材料的力学性能与40支/6股相比,不仅不低,而且还有不同程度的提高,尤其以30支/4股和20支/3股更好.建议以9~11微米的无捻粗纱代替8微米的无捻粗纱. 相似文献
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傅明连;郑炳云;陈彰旭 《中国塑料》2010,24(8):60-63
采用熔融插层法制备了一种高效成核母粒,研究了该成核母粒对玻璃纤维(GF)增强聚对苯二甲酸乙二醇酯(PET)复合材料性能的影响。结果表明,加入6 %(质量分数,下同)的成核母粒时,GF增强PET复合材料的起始结晶温度比纯PET高24.8 ℃,结晶温度范围比纯PET扩大了66.3 ℃,冷结晶峰基本消失,可在70 ℃的模温下进行注塑;同时探讨了螺杆组合对GF增强PET复合材料性能的影响,结果表明,螺杆前段的剪切太强会降低复合材料的冲击强度,通过优化螺杆组合,制备出综合性能优异的GF增强PET复合材料,其热变形温度为228 ℃,拉伸强度159 MPa,弯曲强度235 MPa,冲击强度101 J/m。 相似文献
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短碳纤维增强聚丙烯复合材料性能的研究 总被引:1,自引:0,他引:1
本文研究了单螺杆挤出机加工短碳纤维增强聚丙烯复合材料(CFRPP)的性能。结果表明,经表面处理的短碳纤维与PP复合,得到的材料其拉伸强度、冲击强度和热变形温度有明显提高,成型收缩率显著减小、电性能与半导体相近。本文还结合拉伸断面的电镜照片,比较分析了表面处理前后短碳纤维增强PP复合材料力学性能的变化。 相似文献
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采用玻璃微珠(GB)改性聚丙烯(PP)和线性低密度聚乙烯(LLDPE),对玻璃微珠的用量、粒径和复合材料加工方法对材料的力学性能的影响进行了比较研究。结果表明:随着GB用量的增加,单、双螺杆挤出GB/PP复合材料的拉伸模量、弯曲强度和弯曲模量均呈线性增长的趋势,而屈服强度则有小幅下降;断裂应变在低含量时有所提高,然后迅速下降;单双螺杆挤出材料的冲击强度均有所提高,并在一定范围内随GB用量的提高而增大,且单螺杆挤出材料的冲击强度略高于双螺杆挤出材料。而GB/LLDPE中,随着GB用量的增加,单螺杆挤出复合材料的拉伸模量、弯曲模量均呈线性增长趋势,而屈服强度和弯曲强度在含量较高时略有上升;双螺杆挤出复合材料的拉伸模量、屈服应力、弯曲强度和弯曲模量均呈线性增长的趋势,两者的断裂应变都有所降低,但没有严重劣化LLDPE复合材料的冲击特性。GB的粒径对两种复合材料的力学性能影响不大,但对GB/PP复合材料的韧性有较大影响。单、双螺杆挤出GB/PP复合材料的冲击强度在一定范围内较纯料有一定提高;同样的,双螺杆挤出复合材料的冲击强度低于单螺杆挤出材料。 相似文献
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Effect of geometry and loading fractions on energy absorbing properties of fiberglass polymer composite under quasi‐static and low‐velocity impact loadings 下载免费PDF全文
The focus of this study is to experimentally investigate the mechanical properties of fiberglass reinforced composite with various aspect ratios and loading fractions in the quasi‐static and low‐velocity impact loading conditions. In this study, short fiberglass reinforced polycarbonate composite materials were fabricated via a solution mixing method and characterized for their tensile properties by varying both fiberglass loading fraction and aspect ratio. The tensile properties including tensile toughness of the fiberglass reinforced composites were characterized and compared. It was observed in this study that the toughness of the composite was dramatically improved whereas the tensile strength and Young's modulus were moderately enhanced over the neat polymer, which were measured to be only up to 15% and 70% increase, respectively. The low‐velocity impact behaviors of the fiberglass composites were also investigated and compared to the tensile toughness of the corresponding composites. Besides, the effect of thickness on their low‐velocity impact properties was investigated. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014 , 131, 40821. 相似文献
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《Polymer-Plastics Technology and Engineering》2013,52(5):853-862
Abstract Natural fibers are potentially a high‐performance non‐abrasive reinforcing fiber source. In this study, pulp fibers [including bleached Kraft pulp (BKP) and thermomechanical pulp (TMP)], hemp, flax, and wood flour were used for reinforcing in polypropylene (PP) composite. The results show that pulp fibers, in particular, TMP‐reinforced PP has the highest tensile strength, possibly because pulp fibers were subjected to less severe shortening during compounding, compared to hemp and flax fiber bundles. Maleic‐anhydride grafted PP (MAPP) with high maleic anhydride groups and high molecular weight was more effective in improving strength properties of PP composite as a compatiblizer. Coupled with 10% glass fiber, 40% TMP reinforced PP had a tensile strength of 70 MPa and a specific tensile strength comparable to glass fiber reinforced PP. Thermomechanical pulp was more effective in reinforcing than BKP. X‐ray photoelectron spectroscopy (XPS) and scanning electron microscope (SEM) were used to aid in the analysis. Polypropylene with high impact strength was also used in compounding to improve the low‐impact strength prevalent in natural fiber‐reinforced PP from injection molding. 相似文献
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长碳纤维/聚丙烯复合材料加工工艺和性能的研究 总被引:2,自引:0,他引:2
本文利用单螺杆挤出机,采用电缆包覆式工艺,进行聚丙烯树脂包覆长碳纤维,然后再二次造粒,制备出长碳纤维/聚丙烯合粒料,对此复合材料和原PP树脂的性能测试结果发现,因碳纤维表面未经处理,致使复合材料的拉伸强度,伸长率,缺口冲击强度较原PP树脂有一定程度地下降,而此复合材料的导电性却大大提高,结合其断口和横截面和电子扫描电镜照片,讨论了复合材料力学性能下降和电学性能提高的机理。 相似文献
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以聚丙烯(PP)树脂为基体,加入玄武岩纤维(BF)和相关助剂,通过双螺杆挤出机熔融共混制得相应复合材料。考查相容剂对PP/BF复合材料性能影响、对PP/BF复合材料和PP/玻璃纤维(GF)复合材料力学性能、微观形貌和耐热氧老化等性能进行对比。通过实验数据分析,加入相容剂后,拉伸强度提高126.8%,弯曲强度提高223.8%,弯曲弹性模量提高119.9%,悬臂梁缺口冲击强度提高223.2%。在同样质量配比下,PP/BF复合材料较PP/GF复合材料拉伸强度提高9.8%,弯曲强度提高11.0%,弯曲弹性模量提高5.8%,悬臂梁缺口冲击强度降低10.7%。从微观电镜分析,加入相容剂可明显改善纤维与PP基材界面浸润程度。另外,BF比GF更易使复合材料老化,常规热氧老化剂1010和168对纤维增强PP类材料耐老化效果并不好,用等量自制热氧老化剂可解决此问题。 相似文献
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Highly isotactic polypropylene (PP) is currently studied as a cement‐reinforcement fiber that could potentially be substituted for asbestos because of its resistance to prolonged high‐temperature curing. The higher the isotacticity of the PP fiber is, the higher the tensile modulus and breaking strength of the cured fiber are. The PP fiber that exhibits a isotacticity of 99.6% (XI) and draw ratio of 6.0 retains a tensile modulus of 4.23 GPa, even after high‐temperature curing at 175°C for 5 h. PP fiber is cut into 6‐mm lengths and dispersed throughout a cement mixture to prepare a reinforced cement composite. The mixture is cured in an autoclave at 175°C for 5 h. The Charpy impact strength and flexural strength of the obtained cement composite tends to increase with increasing PP isotacticity. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 130: 981‐988, 2013 相似文献