共查询到18条相似文献,搜索用时 156 毫秒
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火焰喷涂聚酰胺12/n-SiO2复合涂层工艺及性能 总被引:1,自引:0,他引:1
采用火焰喷涂法制备了聚酰胺12(PA12)及聚酰胺12/纳米SiO2(n-SiO2)复合涂层,并利用电子拉力机、摩擦磨损试验机、红外光谱仪(FTIR)和示差扫描量热仪(DSC)等对涂层的结构与性能进行了研究.红外光谱分析表明PA12及PA12/n-SiO2粉末在火焰喷涂过程中没有发生氧化或降解反应,表明火焰喷涂法适宜制备PA12及PA12/n-SiO2复合涂层;DSC分析结果表明n-SiO2具有成核剂作用,能提高PA12大分子的结晶速度及结晶度;涂层力学性能及摩擦磨损性能分析表明n-SiO2能提高涂层的力学性能,改善涂层的耐老化性能和摩擦磨损性能.当n-SiO2添加量为1.5%(质量)时,涂层综合性能最佳. 相似文献
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PP/纳米SiO2/POE复合材料的研究 总被引:8,自引:2,他引:8
采用熔融共混法制备PP/纳米SiO2/POE复合材料,并通过力学性能测试、DSC分析以及材料断面形貌分析等手段,对增强增韧效果进行研究.结果表明纳米SiO2和POE微粒显现了比较明显的协同增韧效果,当PP/纳米SiO2/POE为100/4/15时,综合力学性能最优.纳米SiO2的成核作用提高了PP的结晶温度和结晶速率.两种微粒在PP基体中达到均匀分散,其中纳米SiO2粒子平均粒径为150nm,与其二次粒子直径相当,表明熔融过程并未造成纳米粒子的团聚. 相似文献
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采用火焰喷涂法制备了聚酰胺12 (PA12)及聚酰胺12/纳米SiO2 (n-SiO2)复合涂层,并利用电子拉力机、摩擦磨损试验机、红外光谱仪(FTIR)和示差扫描量热仪(DSC)等对涂层的结构与性能进行了研究。红外光谱分析表明PA12及PA12/ n-SiO2粉末在火焰喷涂过程中没有发生氧化或降解反应,表明火焰喷涂法适宜制备PA12及PA12/n-SiO2复合涂层;DSC分析结果表明n-SiO2具有成核剂作用,能提高PA12大分子的结晶速度及结晶度;涂层力学性能及摩擦磨损性能分析表明n-SiO2能提高涂层的力学性能,改善涂层的耐老化性能和摩擦磨损性能。当n-SiO2添加量为1.5%(质量)时,涂层综合性能最佳。 相似文献
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利用电子拉力机、红外光谱仪(FTIR)、透射偏光显微镜(POM)和差示扫描量热仪(DSC)等研究了纳米SiO2(n-SiO2)对火焰喷涂HDPE涂层力学及热性能的影响.红外光谱和XRD分析表明,HDPE及HDPFJ/n-SiO2粉末在喷涂的过程中没有发生氧化或降解作用,表明火焰喷涂法适合制备HDPE及HDPE/n-SiO2复合涂层.DSC分析表明,n-SiO2具有异相成核作用,当n-SiO2用量为1.0%时,复合涂层的过冷度由10.92℃下降为10.73℃. 相似文献
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采用火焰喷涂法制备了低密度聚乙烯(LDPE)涂层和LDPE/纳米二氧化硅(n-SiO2)复合涂层。利用差示扫描量热法(DSC)对涂层的非等温结晶行为进行研究,并用Jeziorny法和Mo法进行处理。结果表明,Jeziorny法和Mo法处理涂层的非等温结晶过程比较合理;Jeziorny法得到的结晶速率常数和Avrami指数均随冷却速率的增加而增加,且n-SiO2的加入使复合涂层的结晶速率常数和Avrami指数略有升高、半结晶时间降低,结晶速率增大,表明n-SiO2相似文献
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利用火焰喷涂法制备了聚酰胺1010 (PA1010)/纳米氧化锆(nano-ZrO2)复合涂层。采用示差扫描量热法(DSC)研究其非等温结晶行为,对所得的数据分别用Jeziorny法、Ozawa法和Mo法进行处理。结果表明,用Jeziorny法和Mo法处理非等温结晶过程比较理想,而Ozawa法不适用。用Jeziorny法求出的参数Zc(结晶速率常数)和n(Avrami指数)均随降温速率的增加而增加;nano-ZrO2的加入使复合涂层的Zc和n略大于纯PA1010涂层;并使复合涂层结晶半衰期降低、结晶速率及结晶度增大。表明nano-ZrO2具有明显的成核剂作用,加快PA1010的结晶速率,提高涂层的结晶度。 相似文献
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采用熔融共混法制备了PP/纳米SiO2复合材料,并通过力学性能测试、DSC分析以及材料断面形貌分析等手段,对增强增韧效果进行了研究。结果表明,加入纳米SiO2能提高了PP的结晶速率,使结晶度增大。当纳米SiO2的质量分数为2%时可使PP/nSiO2复合材料的缺口冲击强度提高2倍,拉伸强度稍微下降。 相似文献
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SiO_2-g-PMMA/PP纳米复合材料的制备及其性能研究 总被引:1,自引:0,他引:1
采用熔融共混的方法,将经甲基丙烯酸甲酯(MMA)表面接枝的纳米二氧化硅(SiO2-g-PMMA)填充到聚丙烯(PP)中,研究了SiO2-g-PMMA纳米杂化粒子对PP的力学性能和结晶性能的影响。结果表明,SiO2-g-PMMA可以有效地提高PP的拉伸强度、弯曲强度以及洛氏硬度,且效果好于未改性的纳米SiO2。DSC测试结果表明SiO2-g-PMMA的异相成核效果优于未改性SiO2,PP熔融温度提高了2.7℃,结晶温度提高了3.0℃。SEM表明杂化纳米粒子具有一定的增韧作用。 相似文献
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Polyamide1010 (PA1010) and its composite with nanometer‐sized zirconia (PA1010/nano‐ZrO2) coatings were deposited using a flame spray process. The kinetics of nonisothermal crystallization of PA1010/nano‐ZrO2 composite coatings was investigated by differential scanning calorimetry (DSC) at various cooling rates. Several different analysis methods were used to describe the process of nonisothermal crystallization. The results showed that the modified Avrami equation and Mo's treatment could describe the nonisothermal crystallization of the composite coatings very well. The nano‐ZrO2 particles have a remarkable heterogeneous nucleation effect in the PA1010 matrix. The values of halftime and Zc showed that the crystallization rate increased with increasing cooling rates for both PA1010 and PA1010/nano‐ZrO2 composite coating, but the crystallization rate of PA1010/nano‐ZrO2 composite coating was faster than that of PA1010 at given cooling rate. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci 2007 相似文献
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以自制的剥离高岭(MK)、原高岭土(K)以及聚丙烯(PP)和马来酸酐接枝聚丙烯(PP-g-MA)等作为基本原料,通过熔融挤出、注塑成型,制备PP复合材料。采用XRD、DSC、TG研究复合材料的非等温结晶行为、结晶动力学以及热降解性能。结果表明:高岭土的加入,使结晶温度、结晶度、热稳定性都有所提高,且结晶速率加快,具有异相成核作用。与原高岭土相比,改性高岭土更能促进PP复合材料的PP异相成核,促进PP稳态晶型(α晶型)的转变,结晶速率较快。与纯PP和PP/PP-g-MA复合材料相比,PP/改性高岭土复合材料的结晶峰温度、最大热降解温度分别提高了16.7、7.8、9.7、12.6℃。 相似文献
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The flame retardancy of synthesized melamine polyphosphate (MPP) in combination with starch (ST) and different metallic hydroxides was investigated in low density polyethylene (LDPE) by limiting oxygen index (LOI) and vertical burning test. The results indicated that the LOI value of composite comprising Al(OH)3(ATH) was higher than those of composites at the same additive loading with Mg(OH)2(MH)or Fe(OH)3(FH), which increased from 22 to 27%. And the composite comprising ATH passed V1 rating without causing molten drops. In addition, thermostability and morphology were characterized by differential scanning calorimeter (DSC), thermogravimetry (TG), derivative thermogravimetry (DTG), and scanning electron microscope (SEM). The results demonstrated that the crystallization of the composites remained unaffected after the incorporation of metallic hydroxide. The thermal degradation behavior of LDPE composites and the morphology of residual charred layer were changed. It also can be concluded that there was a synergy between certain metallic hydroxide and MPP after analyzing the residual charred layer using X‐ray diffraction (XRD). © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2011 相似文献
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通过熔融共混法制备了ABS、ABS/MH(氢氧化镁)及ABS/MH/BPS(溴化聚苯乙烯)/Sb2O3(氧化锑)阻燃复合材料。使用扫描电子显微镜(SEM)观察了燃烧样条的表面形貌,利用热重分析法(TG)研究了不同升温速率下复合材料的热降解过程,分析了其阻燃机理。结果表明:MH可以增加体系的热稳定性,而加入BPS/Sb2O3会使热稳定性降低;MH和BPS/Sb2O3共同阻燃时,Br-Sb阻燃体系占主导地位,在气相中发挥阻燃效果,MH则在凝聚相起辅助作用,产生物理隔绝和阻止熔融流动的效果。 相似文献
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采用注射成型法制备了铜/低密度聚乙烯/甲基乙烯基硅橡胶(Cu/LDPE/MVQ)复合材料和低密度聚乙烯/甲基乙烯基硅橡胶(LDPE/MVQ)复合材料,采用差示扫描量热法(DSC)研究了复合材料的非等温结晶行为。结果表明,随着冷却速率的加快,复合材料的结晶度逐渐增大。铜颗粒在复合材料中作为异相成核点,同时阻碍着LDPE分子链的运动。 相似文献
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Jichun Liu Yanbin Zhang Zhuoli Yu Weiyuan Yang Jie Luo Bingli Pan Chang Lu 《Polymer Composites》2016,37(3):746-755
Organoclay (organically modified montmorillonite, OMMT) was introduced to the composite of polystyrene/magnesium hydroxide (PS/MH) by melt compounding. The structure of the obtained PS/MH/OMMT composite was characterized by X‐ray diffraction and transmission electron microscopy. Thermal degradation behavior and flame retardancy of the composite were investigated by various means. It is shown that the PS/MH/OMMT composite has an intercalated nanostructure with the PS chains intercalated between the OMMT layers and the MH particles dispersed evenly in the PS matrix. Compared with the PS/MH composite containing identical amount of flame retardant, the introduction of OMMT has increased the thermal degradation temperature and lowered the mass loss rate at high temperatures. The PS/MH/OMMT nanocomposite can produce a more continuous and compact charred residue layer upon degradation both in air and burnt in flame than the PS/MH composite. Because of formation of this highly thermally stable and insulating charred residue layer, the nanocomposite exhibits much improved thermal endurance, flame retardancy, smoke suppression, and dripping resistance. Moreover, the combination of MH and OMMT makes the composite more difficult to ignite and decreases the release of toxic gas. The advantage of the PS/MH/OMMT nanocomposite is more pronounced in the early stage of combustion. POLYM. COMPOS., 37:746–755, 2016. © 2014 Society of Plastics Engineers 相似文献
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Lijian Gu Sumei Zhao Jiaying Xu Yu Hui Xizhi Fan Binglin Zou Ying Wang Xueqiang Cao 《Journal of the European Ceramic Society》2013,33(15-16):3325-3333
Beads and coatings of YAG–YSZ composite ceramic were prepared by plasma spray. YAG was applied as an additive in the hope of improving the phase stability and oxygen impermeability of YSZ. To achieve this aim, some basic research about crystallization behavior and chemical compatibility of the composite were carried out. Plasma sprayed YAG tended to form amorphous state. With the different content of YAG in the composite, crystallization of YAG and YSZ was delayed by each other to different extent due to the barrier effect of heavy atoms. The relative low melting point of YAG led to dense coatings without obvious splat structure and further distinctive vertical cracks during crystallization within the coatings. The cracks became less severe when YAG content was lower. With the addition of YAG, the development of monoclinic ZrO2 was suppressed while Y-rich phases were promoted at higher temperature. 相似文献