碳纤维表面电沉积法制备羟基磷灰石涂层及玻璃纤维增强不饱和聚酯微孔塑料的研究

发布时间：2018-01-03 11:44

本文关键词：碳纤维表面电沉积法制备羟基磷灰石涂层及玻璃纤维增强不饱和聚酯微孔塑料的研究　出处：《陕西科技大学》2015年硕士论文　论文类型：学位论文

【摘要】：本课题源于导师的陕西省自然科学基础研究计划项目“碳纤维/原位生长纳米HA协同强韧HA复合材料的研究(2014JM6233)”和“玻璃纤维/微孔不饱和聚酯复合材料的研究(2010JM6004)”,是项目的一部分研究工作,具体叙述如下:碳纤维(CF)具有无蠕变,耐疲劳,热膨胀系数小,弹性模量高,而且具有生物惰性,在人体中可以稳定存在,无毒性,与人体的各种组织相容性好,无排异反应,在纤维的表面能诱发组织生长,作为一种理想的增强材料,已广泛应用于医学、生命科学等领域。羟基磷灰石(HA)是人体天然骨组织中最主要的无机成分,具有优良的生物相容性及生物活性,其弱点在于脆性较大。为了改善羟基磷灰石的这种脆性,本课题采用CF增强HA复合材料,由于CF的良好力学性能和不错的生物相容性,这种材料有较大的研究前景和研究价值。而CF与HA陶瓷在热膨胀系数上的存在巨大差异,为克服CF与HA陶瓷在热膨胀系数上的巨大差异,可对CF的表面进行适当的处理,使纤维和基体间形成良好的界面粘结。因此,此部分研究内容和结论如下:(1)用电化学沉积法在PAN基碳纤维(CF)表面制备了HA涂层,通过SEM(Scanning Electron Microscope)、EDS(Energy Disperse Spectroscopy)和电沉积时极化曲线等表征,研究不同电流密度、沉积时间以及供电模式等工艺参数对涂层形貌结构的影响,探索HA的电化学沉积规律以控制HA形貌结构。研究发现:沉积电流和沉积电压对涂层的相组成和形貌结构有较大影响,在低电流密度下,涂层主要有针状晶粒组成;在高电流密度下,由棒状晶粒组成,增加沉积电流和沉积时间有利于改善涂层的微观结构和均匀性。另外,恒电流模式下制备的涂层,晶粒尺寸更小,形貌结构更加稳定,涂层与基体的结合情况也优于恒电压模式下制备的涂层。(2)微孔塑料是指泡孔均匀且孔径小于100μm的发泡塑料,典型的微孔塑料泡孔直径在5~50μm之间,泡孔密度达109~1012个/cm3,微孔塑料具有质量轻、价格低、隔热和隔音性能好、比强度高、吸收冲击载荷等优点。本文利用酚醛微球为造孔剂,玻璃纤维为增强相,制备了玻璃纤维增强不饱和聚酯微孔塑料(GF/MCUP)复合材料,研究不同配方对GF/MCUP材料的密度、拉伸,弯曲,冲击等力学性能的影响,从而得到最优配方。通过研究发现:当酚醛微球含量为4%,苯乙烯含量为20%,玻璃纤维含量为19.2%,固化剂含量为1.0%,促进剂含量为0.5%时,复合材料的力学性能最好。
[Abstract]:This project is based on the project of Shaanxi Provincial Natural Science basic Research Project "carbon fiber / in-situ growth of nano-HA synergistic strengthening and toughening HA composite" (2014JM6233). "and" study of glass fiber / microporous unsaturated polyester composites (2010 JM6004) ". It is a part of the research work, described as follows: CFRP has no creep, fatigue resistance, low coefficient of thermal expansion, high modulus of elasticity, and biological inertia, which can exist stably in human body. Non-toxic, good histocompatibility with human body, no rejection reaction, on the surface of the fiber can induce tissue growth, as an ideal reinforcement material, has been widely used in medicine. Hydroxyapatite (HA) is the most important inorganic component in human natural bone tissue and has excellent biocompatibility and bioactivity. In order to improve the brittleness of hydroxyapatite, CF reinforced HA composite was adopted in this paper, because of its good mechanical properties and good biocompatibility. This kind of material has great research prospect and research value. However, there is a great difference in thermal expansion coefficient between CF and HA ceramics, in order to overcome the great difference in thermal expansion coefficient between CF and HA ceramics. The surface of CF can be properly treated to form a good interfacial bond between fiber and matrix. The main contents and conclusions are as follows: (1) HA coating was prepared on the surface of PAN based carbon fiber by electrochemical deposition. Through SEM(Scanning Electron Microscope. EDS(Energy Disperse spectroscopy) and polarization curves of electrodeposition were used to study the different current density. The influence of deposition time and power supply mode on the morphology and structure of the coating. In order to control the morphology and structure of HA, it was found that the deposition current and voltage had great influence on the phase composition and morphology of the coating, and at low current density. The coating mainly consists of needle-like grains. At high current density, the coating is composed of rod-like grains, and the increase of deposition current and deposition time is beneficial to improve the microstructure and uniformity of the coating. In addition, the grain size of the coating prepared under the constant current mode is smaller than that of the coating prepared in the constant-current mode. The morphology and structure of the coating are more stable, and the bonding between the coating and the substrate is better than that of the coating prepared under the constant voltage mode. The microporous plastics refer to the foamed plastics with uniform foam pores and pore size less than 100 渭 m. Typical microcellular plastics have a diameter of 50 渭 m and a density of 109 ~ 1012 / cm ~ (-3). The microcellular plastics have light weight, low price, good insulation and sound insulation, and high specific strength. Using phenolic microspheres as pore-forming agent and glass fiber as reinforcing phase, glass fiber reinforced unsaturated polyester microporous plastic (GF- / MC) composite was prepared. The effects of different formulations on the density, tensile, bending, impact and other mechanical properties of GF/MCUP materials were studied, and the optimum formulation was obtained. It was found that the content of phenolic microspheres was 4%. When the content of styrene is 20%, the content of glass fiber is 19.2%, the content of curing agent is 1.0 and the content of accelerator is 0.5, the mechanical properties of the composite are the best.
【学位授予单位】：陕西科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TB306

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