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熔融模压制备PVDF/石墨烯复合材料及其性能研究 总被引:1,自引:0,他引:1
以聚偏二氟乙烯(PVDF)树脂为基体、石墨烯为填料,通过高速混合机混合作用,经分散剂、润湿剂、表面活性剂、相容剂等组分协同作用,使石墨烯在PVDF中分散均匀,然后经熔融模压成型,制得PVDF/石墨烯复合材料。利用扫描电子显微镜和透射电子显微镜研究了复合材料的微观形貌,并研究了石墨烯含量、制备工艺、助剂及PVDF树脂牌号对复合材料介电性能、导电性能和导热性能的影响。结果表明,采用的助剂体系和高速混合、熔融模压的制备方法能使石墨烯以微片的形态均匀地分散在PVDF树脂基体中,形成良好的功能网络结构;复合材料介电常数、电导率、介电损耗、体积电阻率和导热系数均随石墨烯含量增加而增大;当石墨烯质量分数达到2.0%左右时,复合材料的介电和导电特性均发生突变,向高介电、高导电材料转变,而当石墨烯质量分数达到5.0%左右时,复合材料开始向高导热材料转变;制备工艺和PVDF树脂牌号对复合材料热、电性能的影响则相对较小。 相似文献
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通过溶胶凝胶法制备不同尺寸的BaTiO3@SiO2复合微球并利用混合辊压法成形聚偏二氟乙烯(PVDF)/BaTiO3@SiO2复合薄膜,通过扫描电子显微镜、透射电子显微镜表征其微观结构,并测试了复合材料的介电常数及介电损耗特性.结果表明,BaTiO3@SiO2复合颗粒与偏二氟乙烯共混热压成形方法,提高了无机颗粒的均匀分... 相似文献
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以气相生长碳纤维(VGCF)为导电填料,聚偏氟乙烯(PVDF)、聚甲基丙烯酸甲酯(PMMA)为基体制备复合型导电高分子材料。考察了填料用量、基体种类、配比以及PVDF结晶行为对复合材料导电性能的影响。结果表明,VGCF填充PMMA、PVDF、PVDF/PMMA(50/50)体系的渗滤阔值分别为5、4、3phr的填料用量。VGCF的加入会导致PVDF/PMMA体系发生微观相分离,而且VGCF会选择性富集在PVDF的非晶相中,所以PVDF/PMMA/VGCF体系的导电性呈现双重渗滤现象,该体系的体积电阻率不仅取决于富集相中VGCF的含量,而且还与PVDF相的连续性及其结晶行为密切相关。 相似文献
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采用流延成膜法制备了硅烷偶联剂KH–560和端氨基液体丁腈橡胶(ATBN)协同改性的聚偏氟乙烯(PVDF)/聚醚型热塑性聚氨酯弹性体(PUR–T)复合材料,初步探讨了单一增容剂(KH–560或ATBN)含量、复配增容剂含量与比例及成膜温度等条件对PVDF/PUR–T复合材料力学性能的影响,深入研究了复合材料的结晶性能、热稳定性能和亲/疏水性能。结果表明,与单一增容剂相比,复配增容剂的引入明显提高了复合材料的力学性能,并且当复配增容剂添加量为10%,复配比KH–560/ATBN=3/1,成膜温度为50℃时,其与PVDF/PUR–T基体间的界面粘结性明显得到改善,改性后复合材料断裂伸长率达到273%。PUR–T与复配增容剂的加入抑制了PVDF的结晶,复合材料的结晶度降低,但仍具有良好的热稳定性能,且疏水性得到提高。 相似文献
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针对木塑复合材料力学性能较低和湿热环境下易变形的不足,研究了矿物填料和木粉混杂增强高密度聚乙烯(HDPE)木塑复合材料的力学性能和湿热特性,初步分析了矿物填料微观结构和增强作用的关联关系。结果表明,添加矿物填料对木塑复合材料的弯曲、拉伸和冲击性能有不同程度的改善作用,对模量的提高尤为明显。具有丝束或丝絮状纤维结构的海泡石、硅铝酸纤维和硅灰石对木塑复合材料的增强作用要低于具有长条状纤维结构的水镁石纤维,纤维缠结导致的分散困难可能是其增强作用差的主要原因。海泡石对耐热温度和洛氏硬度的提高作用要优于其它矿物填料,添加了25份海泡石纤维的木塑复合材料的硬度和耐热温度分别提高57. 7%和26%。 相似文献
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利用液相化学还原法制备了Ni微纳米颗粒,通过研磨和热压工艺制备了镍填充聚偏氟乙烯(PVDF)复合材料.研究了Ni/PVDF复合材料在107~ 109Hz频率范围内的介电性能和20℃~200℃范围内冷却过程中的热学性能.结果表明:在107Hz测试频率下,其渗流域值fc=0.275,渗流效应明显.在相同测试频率下,复合材料介电常数和介电损耗均随着Ni颗粒体积分数的增大而增大;在Ni颗粒含量不超过23.1vol%时,在同一体积分数下,介电常数和介电损耗均随着测试频率的增加而减小.Ni颗粒含量为27.1vol%时,在测试频率小于3.5×108Hz时,复合材料介电常数和介电损耗随着测试频率的增加而减小;大于3.5×108Hz时,其介电损耗随着测试频率的增加而逐渐增大,介电常数显著下降.随着Ni颗粒体积分数的增大,复合材料的结晶峰温度升高,结晶焓和结晶度减小. 相似文献
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Qitong Wang Wenlong Jiang Shaowei Guan Yunhe Zhang 《Journal of Inorganic and Organometallic Polymers and Materials》2013,23(3):743-750
GNS/PVDF, AGS/PVDF and AGS@CuPc/PVDF composites were prepared using hot press molding technique. The micromorphologies showed that the dispersion degree of the GNS in the matrix decreases in the following order: AGS@CuPc/PVDF > AGS/PVDF > GNS/PVDF. It could be attributed to AGS treated with copper phthalocyanine (CuPc) exhibit strongest interface bonding with PVDF, and acidification GNS (AGS) have stronger interface bonding with PVDF than GNS. GNS/PVDF composites showed a slight increase in dielectric constant and dielectric loss with the growing content of fillers. AGS/PVDF composites presented a better performance in dielectric constant than that of GNS/PVDF but with a much higher dielectric loss. Especially AGS@CuPc/PVDF three-phase composite displayed better dielectric properties than GNS/PVDF and AGS/PVDF composites, with a dielectric constant 327 and a dielectric loss 0.63 at 10 kHz. It could be attributed to the cooperation of well dispersion of conductive fillers and the electric barrier effects of CuPc. 相似文献
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Hybrid microstructure design has been used to fabricate alumina composites reinforced by 5 vol% of multiwalled carbon nanotube (MWNT) together with different (1, 2, 3 vol%) contents of SiC nanoparticles by spark plasma sintering. The mechanical, thermal, and electrical properties of the composites were determined as a function of the SiC volume fraction. The thermal conductivity decreased for 1 and 2 vol% of SiC, while for 3 vol%, it increased. Substantial improvements in the fracture toughness, bending strength, and electrical conductivity were observed and attributed to a synergetic effect of the MWNT and SiC nanoparticles in the hybrid microstructure design. 相似文献
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聚丙烯/热致液晶聚合物/玻璃纤维混杂复合材料的制备及性能研究 总被引:4,自引:0,他引:4
提出了一种制备原位混杂复合材料的新途径。将聚丙烯(PP)、热致液晶聚合物(TLCP)与玻璃纤维(GF)在高于TLCP熔点的温度下熔融共混挤出,经适当拉伸,然后造粒,得到TLCP成纤良好的PP/TLCP/GF复合材料粒料。将其在不同温度下注射成型,考察了成型温度对所得混杂复合材料中TLCP组分的形态及材料力学性能的影响。结果表明,注射成型温度对最终复合材料中TLCP形态及材料的力学性能有明显的影响。当注射温度为200℃和220℃,即低于TLCP的熔融温度较多时,所得混杂复合材料中TLCP组分保持了较好的微纤结构,复合材料具有良好的力学性能。注射成型温度为240℃时,复合材料中TLCP相开始出现熔融回缩;而当加工温度高于260℃后,TLCP分散相主要成球形。随注射成型温度升高,混杂复合材料的力学性能逐渐下降。在基体中加入聚丙烯接枝马来酸酐(PP-g-MAH)作为增容剂,可以同时改善PP与TLCP、PP与GF之间的界面黏结,从而有利于混杂复合材料力学性能的提高。 相似文献
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This work aims to address the heat accumulation issue in electronic components during high-frequency operation through the preparation of novel thermally conductive composites. First, polydopamine (PDA) and in-situ growth of silver (Ag) nanoparticles are applied for the surface modification of graphene oxide (GO) and carbon nanotube (CNT) to prepare pGO@Ag and pCNT@Ag hybrid filler, respectively. Then, nitrile butadiene rubber (NBR) is chosen as the polymeric matrix and simultaneously incorporated with both pGO@Ag and pCNT@Ag to prepare polymeric composites with excellent thermal conductivity (TC) and dielectric constant (ɛr). Due to the construction of 3D heat conduction networks by utilizing 2D pGO@Ag and 1D pCNT@Ag, the fabricated NBR composites achieved the maximum TC of 1.0112 W/(mK), which is 636% higher than that of neat NBR (0.1373 W (mK)−1). At the filler loading of 9 vol%, the TC of pGO@Ag/pCNT@Ag/NBR composite is 152% that of GO/CNT/NBR composite (0.6660 W (mK)−1). Moreover, due to electron polarization effect of GO and CNT and micro-capacitor effect of Ag nanoparticles, a large ɛr of 147.12 is attained at 10 Hz for NBR composites. Overall, the development of dielectric polymer materials with high TC is beneficial for enhancing the service life and safety stability of the electronic components. 相似文献
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选用登封轻烧矾土(Al2O3含量为85wt%)、电熔镁铝尖晶石、高纯电熔镁砂、Al粉和少量的活性材料氮化气氛下制备矾土基MgAlON复合材料,考察了MgAlON含量及烧成温度对制备矾土基MgAlON复合材料性能的影响.结果表明:随着MgAlON加入量的增加,显气孔率、线变化率及增重率逐渐增大,材料体积密度逐渐减少,常温抗折强度呈上升趋势;随着烧成温度的提高,试样的体积密度略有减小,显气孔率增大,常温抗折强度逐渐增大,1500℃下氮化烧成的制品性能最好;矾土基MgAlON复合镁铝尖晶石材料比矾土基MgAlON复合镁质材料密度大,强度高,氮化效果好. 相似文献
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Cassava starch-filled natural rubber (NR) composites were prepared by using direct blending and co-coagulation method. The effects of two different method and cassava starch loading on morphology, mechanical properties and thermal properties of cassava starch/NR composites were studied. X-ray diffraction results and scanning electron microscopy images proved that co-coagulation method promotes better dispersion of cassava starch than direct blending method. The composites prepared by co-coagulation method exhibited higher values of tensile strength, tear strength, hardness, and thermal stability. The optimum value of tensile strength and tear strength of cassava starch/NR composites were achieved at a 10 phr cassava starch loading. 相似文献