Chemical and thermal resistance of basalt fiber in inclement environments

To study the applicability of the basalt fiber through various experimental works in thermal and chemical environments, glass fiber and carbon fiber were compared and discussed. The tensile strength testing was used to investigate the corrosive resistance of basalt fiber, meanwhile, surface study by scanning electron microscopy and microanalysis with complementary X-ray diffraction analysis (SEM/EDS) was also used to ascertain the durability of basalt fiber. The basalt fiber showed better strength retention than the glass fiber at relatively high temperature. Its tensile strength increased when exposed at 300 °C for several hours, and still maintain about 70% of the initial strength at 400 °C, whereas that of the glass fiber decreased dramatically. The better stability of the basalt fiber was observed in hydrothermal and chemical environment. The tensile strength of the basalt fiber increased by 20% after the immersion in boiling water and remained well in acid solution, when it comes to glass fiber, the tensile strength decreased to some extent. Although the alkali resistance of basalt fiber was poor at the initial stage, it shows better resistance than the glass fiber after long time treatment.     

POSS-g-PPOE对PPB/POE共混体系力学性能影响

采用双螺杆反应挤出,以多面体齐聚倍半硅氧烷(POSS)为接枝反应中心,嵌段共聚聚丙烯(PPB)、聚烯烃弹性体(POE)为接枝链段,制备接枝聚合物POSS-g-PPOE。使用傅里叶变换红外光谱和差示扫描量热(DSC)分析对接枝产物POSS-g-PPOE进行了表征。结果表明,PPB,POE与POSS发生了接枝反应。将POSS-g-PPOE与PPB,POE进行共混挤出,并通过DSC、力学性能进行分析。从测试结果看,添加接枝产物POSS-g-PPOE后,可以一定程度上提高PPB/POE体系的熔融温度和相容性能。PPB/POE力学性能随着POSS-g-PPOE的增加先增加后降低,在POSS-gPPOE添加质量为4%时,缺口冲击强度达到峰值,为103 kJ/m2,其他力学性能保持在较高水平。由于POSS-g-PPOE为大分子聚合物,当POSS-g-PPOE添加比例过高时,除了部分参与界面相容改性外,多余部分反而以杂质形式存在,导致力学性能下降。从扫描电子显微镜测试结果看,PPB断面可以清晰地看到PP基体中均匀分散乙丙橡胶颗粒,添加POE后,断面发生脆韧转变,抗冲性能提高。但由于POE本身强度较低,...     

石墨烯在电磁屏蔽与吸波材料方面的应用及研究进展

当代电子信息技术的发展和电子产品的普及,在满足人们生活需要的同时,使得电磁波在人们日常生活中广泛存在。电磁波辐射造成了电磁污染、电磁干扰、泄密等棘手问题,妨碍了电子信息工业稳定发展。有效解决这一问题的方案,是研发出能够吸收特定频段电磁波的材料,因此,吸波材料在民事领域具有广泛的应用前景。而在军事领域,雷达常用于搜寻目标,它是通过发射电磁波,然后     

嵌段共聚物偶联剂对玄武岩纤维增强聚丙烯复合材料的改性研究

玄武岩纤维(BF)增强聚丙烯(PP)复合材料体系中,引入了聚苯乙烯(PS)与聚丙烯酸羟乙酯(PHEA)的嵌段共聚物大分子偶联剂(PS-b-PHEA),以改善复合材料的界面性能。结果表明:通过嵌段共聚物PS-b-PHEA对复合材料改性,一方面能够使玄武岩纤维与PP基体具有良好的界面黏结,另一方面能够在界面处形成柔性层,松弛界面热应力,迅速分散外加载荷,吸收外力的能量,实现复合材料的增强增韧。