共查询到18条相似文献,搜索用时 72 毫秒
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系统研究了偶联剂和润滑剂等添加剂对注射成型尼龙6铁氧体粘结磁体磁性能的影响。结果表明,用偶联剂对磁粉进行表面处理,能够很好地改善树脂与磁粉的相容性,提高磁粉在树脂中的分散性,其中当偶联剂用量为2%(质量分数,下同)时,磁性能最好,剩磁(Br)、矫顽力(HcB)、内禀矫顽力(HcJ)以及最大磁能积(BHmax)分别达到0.23T,176.3kA/m,283.8kA/m,10.4kJ/m^3;润滑荆的使用能有效改善体系的流动性,降低共混过程中对磁粉结构的破坏,改善磁体的磁性,当润精剂用量为1%时,HcJ增加了9.3%。 相似文献
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以己内酰胺(CL)、高密度聚乙烯(PE-HD)、马来酸酐接枝高密度聚乙烯(PE-HD-g-MAH)为主要原料,采用反应挤出法制备PE-HD /聚酰胺6(PA6)原位合金,研究螺杆构型对PE-HD/PA6原位合金制备的影响。研究发现,停留时间长的螺杆构型,其对应的原位合金中CL单体转化率较高;在3种螺杆构型中,带有大导程拉伸元件的螺杆,所制备的原位合金中分散相PA6的粒径最小,其原因在于CL单体在PE-HD中的初始分散状态对合金中分散相PA6的粒径有直接影响,而大导程拉伸元件更有利于CL在PE-HD基体中的破碎与分散。 相似文献
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利用H2O2和浓H2SO4的混合溶液、浓硝酸分别对碳纳米管(CNTs)进行改性处理,并用改性CNTs与一定量的硝酸铁、硝酸锶反应.制备出了改性碳纳米管与锶铁氧体复合材料。利用IR、VSM、TEM等检测了材料的性能。结果表明,改性后的碳纳米管表面主要引入了羟基、羰基,其水溶性明显增强;复合材料的磁性能较好,但加入CNTs后,复合材料的矫顽力呈降低趋势,且随着CNTs含量的增加,矫顽力降低越大。空白实验表明,锶铁氧体的粒径在20nm左右,这也是复合材料磁性能较高的主要原因。 相似文献
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在啮合同向双螺杆挤出机中,研究了6种不同螺杆构型对聚丙烯/聚酰胺6(PP/PA6)共混物相态结构和性能的影响。结果表明,在熔融段设置拉伸型元件时,共混物的拉伸强度和冲击强度较大,而弯曲强度和流动性能则较小,分散相粒径较小且粒径分布更均匀;在熔融段设置剪切型元件、熔体输送段设置六棱柱(FTX)元件时,共混物的流动性能最好。 相似文献
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研究3种W型六角晶系锶铁氧体(BMA-PX,WPS,WPX)作吸波填料对甲基乙烯基硅橡胶(MVQ)吸波性能的影响。结果表明:3种W型六角晶系锶铁氧体均为无规的碎石状颗粒,元素组成不同,吸波性能差异较大。铁元素质量分数较大的BMA-PX吸波MVQ磁损耗较大,容易实现阻抗匹配,在中高频下的电磁波反射率低,吸波性能优异。 相似文献
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Polyamide 6 (PA 6) and cationic dyeable polyamide 6 (CD-PA 6) polymers were blended mechanically in the proportions of 75/25, 50/50, 25/75 in a melt twin-screw extruder to prepare three PA 6/CD-PA 6 polyblended polymers. The molar ratio of dimethyl 5-sulfoisophthalate sodium salt (SIPM) for CD-PA 6 polymer was 2%. This study investigated the physical properties of PA 6/CD-PA 6 polyblended materials using gel permeation chromatograph (GPC), nuclear magnetic resonance (NMR), gas chromatography (GC), potentiometer, thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), the density gradient method, a rheometer, and extension stress–strain measurement. Experimental results of the DSC indicated PA 6 and CD-PA 6 molecules easily formed miscible domains. The surface of PA 6/CD-PA 6 polyblend exhibited a uniform morphology from the scanning electron microscope (SEM). The SEM observations of morphologies were consistent with the DSC results for PA 6/CD-PA 6 polyblends. PA 6 and CD-PA 6 polymers were proven to be a compatible system. Flow behavior of PA 6/CD-PA 6 polyblends exhibited positive-deviation blends (PDB) and the 50/50 blend of PA 6/CD-PA 6 showed a maximum value of the melt viscosity. The crystallinities of PA 6/CD-PA 6 polyblends declined as a SIPM content increased. Moreover, the crystallinity of DSC method was slightly less than that of the density gradient method. The weight loss percentages of the PA 6/CD-PA 6 polyblends increased as the SIPM content increased in aqueous NaOH solution. 相似文献
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反应挤出聚酰胺6/蒙脱土纳米复合材料的双螺杆螺杆元件组合设计 总被引:2,自引:1,他引:2
研究了已内酰胺单体通过反应型双螺杆反应挤出的方法合成聚酰胺6/蒙脱土纳米复合材料。讨论了反应挤出双螺杆螺杆元件组合设计,螺杆组合与停留时间的关系,以及挤出段螺槽充满程度与排气、冒料的关系。 相似文献
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针对混沌螺杆的混沌单元,对其加工高分子材料的混合性能进行模拟并与螺杆单元比较,采用PP/ABS共混物进行力学性能与微观形态实验。结果表明:混沌单元的停留时间概率密度曲线峰宽,拉伸长度对数曲线斜率增大,对物料拉伸折叠作用强,有利于提高共混物的混合性能;随着混沌螺杆转速的增加,PP/ABS共混物的冲击强度和拉伸强度先下降后上升;混沌单元的周期性间断多副螺棱具有很好的混沌混合特征,物料开始进入混沌单元时分散相被迅速分离,分散相粒径减小有一个相对缓慢期,随后分散相又被迅速分离,使得分散相粒径不断减小,提高了PP/ABS共混物的混合效果。 相似文献
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Effect of Polyamide 66 on the Mechanical and Thermal Properties of Post-Industrial Waste Polyamide 6
Hesam Ghasemi Amin Mirzadeh Musa R. Kamal 《Polymer-Plastics Technology and Engineering》2013,52(17):1794-1803
Post-industrial waste (PIW) polyamide 6 is successfully used in lieu of commercial virgin polyamide 6, in several automotive applications. The presence of polyamide 66 in the final formulation may affect the mechanical and thermal properties of the PIW polyamide 6 materials. Using unreinforced polyamide 6 from PIW and commercial sources, it was found that the addition of polyamide 66 (below 10 wt.%) lowered the crystallization rate and crystallinity level of all polyamide 6 materials. The thermal and mechanical properties of glass fiber (GF) reinforced PIW polyamide 6 compounds with and without polyamide 66 were also studied. Differential scanning calorimetry (DSC) showed that reinforced materials without polyamide 66 had a higher level of crystallinity. Furthermore, dynamic mechanical analysis (DMA) showed that reinforced compounds without polyamide 66 also had a faster storage modulus buildup immediately after injection molding. Reinforced PIW polyamide 6 compounds without polyamide 66 also exhibited higher tensile and higher vibration weld strengths as well as a thicker heat affected zone (HAZ) than those with polyamide 66, leading to the conclusion that polyamide 66 had a detrimental effect on crystallinity level and consequently on the mechanical properties of GF-reinforced PIW polyamide 6 materials. 相似文献
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利用反应挤出法制备了聚酰胺6(PA6)接枝新癸酸缩水甘油酯(GND)改性材料,通过红外光谱分析对改性产物的分子结构进行了测试,并对改性材料的结晶性能、流变性能和力学性能等进行了研究。结果表明,单环氧化合物能够在挤出过程中与PA6发生接枝反应,生成支化PA6产物;接枝链降低了PA6的结晶速率和结晶度,在宏观上相应地表现出材料力学性能的变化;GND最佳用量范围为1~3份,当其用量为1份时,相对于纯PA6,支化PA6的拉伸强度降低了8 %,断裂伸长率和缺口冲击强度分别提高了161 %和35 %。 相似文献