The Inhibitive Effect of para-Amino Benzoic Acid and Its Polymer on Corrosion of Iron in 1 mol/L HC1 Solution

Poly p-aminobenzoic acid has been synthesized by chemical oxidation method. The inhibitive effect of poly p-aminobenzoic acid on iron in 1 mol/L HCl solution was investigated by polarization and electrochemical impedance spectroscopy and compared with that of monomer p-aminobenzoic acid. The effectiveness of poly p-aminobenzoic acid is very high in comparison with that of monomer. The results show that both cathodic and anodic processes were suppressed by p-aminobenzoic acid and poly p-aminobenzoic acid of iron dissolution in 1 mol/L HCI by their adsorption on the iron surface. The inhibition efficiency of both p-aminobenzoic acid and poly p-aminobenzoic acid were found to increase with the inhibitor concentrations. Ultraviolet (UV) reflectance studies of the iron surface after exposure to inhibitor acid show that poly p-aminobenzoic acid is strongly adsorbed on iron surface.     

对氨基苯甲酸插层镁铝水滑石的合成、表征及紫外吸收性能

以微波结晶法制备的碳酸根型镁铝水滑石(LDHs)为前体, 对氨基苯甲酸为客体, 由水热法、离子交换法、焙烧复原法三种方法组装合成了对氨基苯甲酸插层镁铝水滑石复合材料。并用XRD、FTIR、TG-DSC、SEM等对其结构进行表征。结果表明: 各种方法均能合成相应的插层水滑石层柱材料, 层间距分别扩大为0.81 nm、0.79 nm、1.45 nm。三种合成材料的紫外吸收强弱与对氨基苯甲酸插层水滑石分子后的层间距大小有关。该研究指出对氨基苯甲酸插层水滑石作为一种紫外吸收层柱材料在化妆品领域具有应用潜力。      

苯丙氨酸及其与抗坏血酸复配对酸性溶液中铜的缓蚀性能

氨基酸类物质无毒、易生物降解,作为缓蚀剂的研究正在兴起。将苯丙氨酸与抗坏血酸复配作缓蚀剂,采用电化学交流阻抗法、极化曲线法研究了苯丙氨酸及其与抗坏血酸复配缓蚀剂在0．25mol／LHCl溶液中对铜腐蚀的影响。结果表明：苯丙氨酸及其与抗坏血酸复配溶液均属于阴极型缓蚀剂;在0．25mol／LHCl溶液中,苯丙氨酸浓度从1．0×10。mol／L增大至1．0×10～mol／L,缓蚀效果增强;复配溶液的缓蚀效果明显好于单独的苯丙氨酸,且随着复配溶液中抗坏血酸浓度的增加,缓蚀效果也明显提高。     

酸刻蚀对玄武岩纤维表面偶联剂吸附量及纤维/环氧树脂复合材料力学性能的影响

纤维与树脂的复合需要有一个良好的界面相,以便能将载荷从基体有效地传递给增强纤维,纤维表面改性处理是达到这一要求的主要方法。采用盐酸刻蚀法对玄武岩纤维（BF）表面进行处理,讨论了酸刻蚀对纤维单丝拉伸性能、表面硅烷偶联剂吸附量的影响以及盐酸浓度对BF/环氧树脂复合材料力学性能的影响。结果表明：纤维的单丝拉伸强度随着盐酸浓度的升高呈加速下降趋势;1 mol/L盐酸处理后的纤维表面对硅烷偶联剂KH550的吸附量最大;1 mol/L盐酸刻蚀后再经硅烷偶联剂KH550处理的纤维制成的BF-KH550/环氧树脂复合材料的弯曲性能、拉伸性能和层间剪切强度最优。     

葡萄糖与甘氨酸反应产物对碳钢的缓蚀效果

为了解葡萄糖与甘氨酸反应产物对碳钢的缓蚀效果,采用失重法、电化学法并结合扫描电镜观察,研究了葡萄糖与甘氨酸反应产物(PGG)对碳钢在1 mol/L HCl溶液中的腐蚀抑制作用。结果发现:PGG对碳钢表现出很好的缓蚀效果,缓蚀效率随添加浓度的增加而增加,在最大浓度250 mg/L时,表现出最好的缓蚀效果,缓蚀效率为94.7%,且缓蚀效率随温度升高而降低。PGG同时抑制了碳钢腐蚀的阴极还原反应和阳极氧化反应过程,为混合型缓蚀剂,是通过多组分的物理和化学联合吸附,在碳钢表面上形成保护性覆盖层,将碳钢与酸溶液隔离,从而起到缓蚀作用,其吸附行为遵循Langmuir吸附等温模型。葡萄糖与甘氨酸反应产物(PGG)是碳钢在1 mol/L HCl溶液中的优良缓蚀剂。     

乳状液膜法提取模拟湿法磷酸中的稀土镧

采用自制的磺化聚丁二烯(LYF)作表面活性剂,以二(2-乙基己基磷酸,P204)为萃取剂,以4mol/L HCl为内相,液体石蜡为膜稳定剂,制成乳状液膜,从模拟湿法磷酸中萃取稀土镧.在膜内比为1.2∶1,制乳搅拌,搅拌速度为2 000r/min,时间为20min,提取搅拌速度为250r/min,时间为10min,水乳体积比为2∶1,磷酸质量分数为10%P2O5,La3+含量为300mg/L时,镧离子的迁移率达到86.67%.同时利用液液萃取通过斜率分析法讨论P204从磷酸中提取镧离子的反应机理.对P204萃取镧离子进行热力学研究,结果表明,萃取反应属于放热反应,反应热为-7.697 1kJ/mol.     

New synthesis method of HA/P(D,L)LA composites: study of fibronectin adsorption and their effects in osteoblastic behavior for bone tissue engineering

A novel synthetic method to synthesize hydroxyapatite/poly (D,L) lactic acid biocomposite is presented in this study by mixing only the precursors hydroxyapatite and (D,L) LA monomer without adding neither solvent nor catalyst. Three compositions were successfully synthesized with the weight ratios of 1/1, 1/3, and 3/5 (hydroxyapatite/(D,L) lactic acid), and the grafting efficiency of poly (D,L) lactic acid on hydroxyapatite surface reaches up to 84?%. Scanning electron microscopy and Fourier transform infrared spectroscopy showed that the hydroxyapatite particles were successfully incorporated into the poly (D,L) lactic acid polymer and X ray diffraction analysis showed that hydroxyapatite preserved its crystallinity after poly (D,L) lactic acid grafting. Differential scanning calorimetry shows that Tg of hydroxyapatite/poly (D,L) lactic acid composite is less than Tg of pure poly (D,L) lactic acid, which facilitates the shaping of the composite obtained. The addition of poly (D,L) lactic acid improves the adsorption properties of hydroxyapatite for fibronectin extracellular matrix protein. Furthermore, the presence of poly (D,L) lactic acid on hydroxyapatite surface coated with fibronectin enhanced pre-osteoblast STRO-1 adhesion and cell spreading. These results show the promising potential of hydroxyapatite/poly (D,L) lactic acid composite as a bone substitute material for orthopedic applications and bone tissue engineering.     

pH值对合成聚苯丙炔酸的影响

苯丙炔酸上的羧基起到终止剂的作用,限制了苯丙炔酸的聚合。加入NaOH将单体转化成钠盐,聚合后用HCl酸化成聚苯丙炔酸。单体由肉桂酸和液溴通过先加成后消去反应制得。利用红外光谱、紫外光谱、荧光光谱、凝胶渗透色谱和TGA对单体及聚合物的结构和性能进行了表征,2212cm-1处C≡C键伸缩振动特征吸收峰消失形成1602cm-1C—C键伸缩振动特征峰,表明了聚合物的合成。荧光光谱显示聚苯丙炔酸在375nm激发波长下发蓝光,于465nm处有特征荧光发射峰,与没有加NaOH聚合的聚合物相比较,紫外吸收波长范围更大,加碱聚合的聚苯丙炔酸分子量能达到10552,TGA测试结果表明聚苯丙炔酸具有一定的热稳定性。     

窄分子量分布的乙酸乙烯酯聚合物的制备

以丙烯酸为调聚单体、偶氮二异丁腈为引发剂、甲醇为溶剂进行乙酸乙烯酯溶液聚合。通过聚合转化率和凝胶渗透色谱的测定,研究了聚合过程和所制备聚合物的分子量及其分布,以及丙烯酸对聚合物分子量分布的影响;进一步探讨了反应装置的安装及结构对聚合反应的影响。结果表明,适当引入丙烯酸,当丙烯酸/乙酸乙烯酯的摩尔比为3/100,并采用密封冷凝搅拌装置,反应5 h,既可确保较高聚合转化率,又可获得窄分子量分布的聚合产物。     

反相悬浮聚合法制备高吸水树脂及其性能研究

采用反相悬浮聚合法制备聚丙烯酸钠高吸水树脂,研究了中和度,引发剂用量,交联剂用量,悬浮剂用量对高吸水树脂的吸水性能的影响,得出吸水能力与匀联剂用量之间存在着Ｑ＝２．０１４Ｃ＾－０．７３５ｃ的关系。研究了丙烯酸中存在阻聚剂时对高吸水树脂吸水能力的影响,发现市售阻聚剂含量为０．０５％－０．１％的丙烯酸可直接用于高吸水树脂的制德。     

羧甲基壳聚糖在酸性溶液中对铝的缓蚀作用

羧甲基壳聚糖是一种环境友好的重要衍生物,采用失重及电化学方法（EIS）研究了羧甲基壳聚糖（CM—ehitosan）在1mol／LHCI溶液中对铝（2024）的缓蚀作用。失重和电化学测试均表明,当羧甲基壳聚糖浓度达到200mg／L时缓蚀效率最高,可达88．54％。进一步的拟合计算表明,羧甲基壳聚糖在铝表面的吸附基本遵循修正的Langmuir吸附等温式,并获得上述吸附过程的热力学参数△Go、△Ho和△So。     

聚乙烯结晶度对银抗菌剂溶出的影响EI

采用双螺杆挤出的方法制备了低密度聚乙烯(LDPE)/玻璃载体银系抗菌剂(IONPURE)的抗菌塑料。用溶出伏安法测定了抗菌塑料中银离子的溶出速率,用差示扫描量热法(DSC)研究了抗菌LDPE的熔融和结晶行为,用XRD和POM对LDPE的晶形和结晶度进行了表征,结果表明,抗菌剂在LDPE中起到异相成核的作用,随着其含量从0%增加到8%,LDPE结晶度呈现先增加后下降的趋势,而晶粒尺寸则逐渐减小。同时,通过加速溶出实验研究了不同结晶度抗菌LDPE样品中银离子的溶出行为,发现样品结晶度越大,银离子溶出速率越小,并且随着在水中浸泡时间的延长,结晶度影响越发明显。     

Electrosysnthesis of poly(aniline-co-m-amino benzoic acid) for corrosion protection of steel

Conducting polymer (poly(aniline-co-m-amino benzoic acid)) has been deposited on steel surface by cyclic voltammetric technique. The copolymer film was characterized by FTIR, XPS and SEM techniques. The corrosion protection performance of copolymer film on steel was found out by impedance and tafel polarization methods in 1N HCl. The copolymer film was found to be highly corrosion resistant.     

乙二酸体系中制备纳米Fe_3O_4及其电磁性能

以乙二酸为有机添加剂,氢氧化钠为沉淀剂,采用液相共沉淀法制备纳米Fe3O4,研究制备过程中各影响因素如铁盐种类、铁盐用量及沉淀反应时间对产物粒度、形貌和复磁导率的影响。采用X射线衍射仪、扫描电镜、透射电镜及矢量网络分析仪对纳米Fe3O4颗粒的粒度、形貌和复磁导率进行检测与表征。结果表明:在乙二酸及氢氧化钠沉淀剂体系中,最适宜的试验条件是:硫酸亚铁为原料,硫酸亚铁用量为0.4 mol/L,晶化反应时间为20 min,在此条件下制备的纳米Fe3O4平均粒径为13 nm,不仅复磁导率最大,而且介电损耗正切值和磁滞损耗正切值都最大。     

盐酸介质中咪唑离子液体对铜的缓蚀作用

以1-甲基咪唑、1,4-丁烷磺内酯和浓硫酸为原料,用乙醚洗涤合成了1-甲基-3-(4-硫酸基丁基)咪唑硫酸盐(4-BMIM)缓蚀剂。采用动电位极化和交流阻抗技术研究了4-BMIM在5%HCl溶液中对铜的缓蚀性能及作用机理。实验结果表明:缓蚀效率随着缓蚀剂浓度的增加先增大后降低,当浓度为0.03mol/L时,缓蚀效率最高;同一浓度下,随着温度的升高缓蚀效率降低。动电位极化表明咪唑离子的加入对铜的阴、阳极腐蚀过程均有抑制作用,是混合型缓蚀剂。热力学计算结果表明咪唑离子液体吸附在铜表面,其吸附机制为自发进行的物理吸附,并且在铜/溶液界面的吸附遵循Langmuir吸附等温式。     

微波辅助加热法在泡沫镍表面生长纳米碳管

以酸处理过的泡沫镍为催化剂前驱体及辅热材料,以菲为碳源,使用微波辅助加热法,短时间内在泡沫镍表面及内孔生长管径分布均匀、长径比较大的纳米碳管(CNTs)。使用扫描电子显微镜(SEM),X射线衍射仪(XRD)对所得产物的微观形貌和结构进行表征,并研究泡沫镍的结构、前处理用酸浓度、微波加热时间等对制备的CNTs的影响,最后提出了CNTs的生长机理。结果表明:酸浓度为6mol·L~(-1),微波时间为30s时,所得碳纳米管管径约为30nm,长度可达微米级。     

Combined Computational and Experimental Study on the Adsorption and Inhibition Effects of N2O2 Schiff Base on the Corrosion of API 5L Grade B Steel in 1 mol/L HCI

The electrochemical behavior of low carbon steel （API 5L grade B） in 1 mol/L HCI solution with different concentrations of N,Nr-bis（4-formylphenol）-trimethylenediamine Schiff base was studied by electrochemical techniques and density functional theory analysis. The inhibition efficiency was found to increase with increasing inhibitor concentration and decreased with increasing temperature. The high inhibition efficiency was attributed to the blocking of active sites by adsorption of inhibitor molecules on the steel surface. Thermodynamic parameters for the adsorption and activation processes were determined. Galvanostatic polarization data indicated that Schiff base act as a mixed-type inhibitor and the adsorption isotherm obeyed the Langmuir adsorption isotherm. Results obtained from quantum chemical studies show excellent correlations between the quantum chemical parameters and the experimental inhibition efficiencies using density functional theory at the B3LYP/6-31G（d,p） and B3LYP/3-21G basis set levels and ab initio calculations using HF/6-31G（d,p） and HF/3-21G methods.     

A green and effective corrosion inhibitor of functionalized carbon dots

In this work, a green and effective corrosion inhibitor of functionalized carbon dots (FCDs) was synthesized by the conjugation of imidazole and citric acid carbon dots (CA-CDs). The corrosion inhibition behavior of FCDs for Q235 steel in 1 M HCl solution was systematically investigated by electrochemical analysis, corrosion morphology and adsorption isotherm. The electrochemical results implied that the as-prepared FCDs inhibitor could effectively suppress the corrosion of Q235 steel in 1 M HCl solution. At the same time, the inhibition efficiency of steel in 1 M HCl solution was more than 90% when the inhibitor concentration exceeded 100 mg/L. This excellent property was attributed to the coverage of adsorption film on the steel surface, which conformed to the Langmuir adsorption model. In addition, the analysis of adsorption isotherm displayed that the adsorption mechanism was the physicochemical interaction at the steel/solution interface.     

无皂苯丙乳液的合成及性能研究

在少量甲基丙烯酸钠盐的存在下,成功合成了具有高稳定性、高透明性的聚(苯乙烯／丙烯酸丁酯)P(St／BA)无皂共聚乳液。同时．本文还对不同配方的乳液及其涂膜的综合性能进行了研究,总结了组成与性能之间的对应关系。其中,着重讨论了单体组成与乳液表面能、乳胶粒尺寸之间的关系。结果表明,随单体配比中St含量的增加。乳液接触角和乳胶粒粒径减小。乳胶粒具有均一的尺寸,并显示出明显的核壳结构。本文通过对苯丙无皂乳液组成与性能关系的研究,积累了一定量的理论数据,为无皂乳液产品的进一步开发提供了条件。     

聚丙烯酸-g-聚(卤代)苯乙烯两亲性接枝共聚物的可控合成

以丙烯酸甲酯、(卤代)苯乙烯为原料,利用原子转移自由基聚合技术、从主干接枝的合成策略和聚丙烯酸甲酯的碱性水解,实现了两亲性接枝共聚物聚丙烯酸-g-聚(卤代)苯乙烯的可控合成.主链和侧链的分子量可分别通过调整单体与引发剂的投料比和反应时间进行控制.(卤代)苯乙烯单体接枝共聚时,采用单体过量的本体聚合且单体转化率控制在10...