聚对苯二甲酰对苯二胺/水滑石纳米复合材料的制备与表征

近20年来,人们已经研究和制备了很多聚合物／层状无机粘土纳米复合材料,但所用无机粘土绝大多数为蒙脱土等具有层状结构的阳离子化合物,而对以水滑石(LDH)等阴离子型化合物为基础制备的聚合物／层状无机物纳米复合材料的研究近期才有报道．     

聚对苯二甲酸丁二酯/聚对苯二甲酸乙二酯固态缩聚的研究

研究了聚对苯二甲酸丁二酯(PBT)/聚对苯二甲酸乙二酯(PET)共混物的固态缩聚反应,从反应动力学过程的测定结果,表明与纯PET或PBT不同,其反应速度较快,并呈超加和的相对分子质量(以特性粘数[η]表征)增长。从反应发生在液相的基本观点出发,说明温度、共混等使液相增多,将加速反应的进行,加上共混物之间的相互缩聚和酯交换,生成嵌段共聚物的结果,导致超加和效应。     

聚对苯二甲酸乙二醇酯/蛭石纳米复合材料的制备

聚对苯二甲酸乙二醇酯/蛭石纳米复合材料的制备     

聚对苯二甲酸乙二醇酯/碳酸钙纳米复合材料的制备和表征

以聚乙二醇磷酸酯1000为表面处理剂, 采用碳化法合成了方解石型碳酸钙纳米粒子, 进一步制备了聚对苯二甲酸乙二醇酯/碳酸钙纳米复合材料. 采用透射电子显微镜(TEM)、 X射线衍射(XRD)、 傅里叶变换红外光谱(FTIR), 场发射扫描电子显微镜(FESEM)和热重分析(TGA)对样品进行了分析. 结果表明, 聚乙二醇磷酸酯1000成功地修饰到碳酸钙的表面, 并得到平均直径为60 nm, 形貌为立方体的纳米碳酸钙晶体. 与碳酸钙(空白)样品相比, 表面处理碳酸钙的复合材料表现出更好的分散性和热稳定性. 采用Friedman方法计算了复合材料热分解的活化能. 聚对苯二甲酸乙二醇酯、 聚对苯二甲酸乙二醇酯/空白碳酸钙和聚对苯二甲酸乙二醇酯/表面处理碳酸钙的活化能分别为200.58, 214.86和219.50 kJ/mol, 进一步说明了表面处理碳酸钙更好地改善了聚对苯二甲酸乙二醇酯的热稳定性.     

非晶聚对苯二甲酸乙二酯的制备与表征

采用引入U-polymer的路线制备了非晶聚对苯二甲酸乙二酯(APET).用DSC和DMA等手段研究了APET的性能.结果表明,经改性后得到的APET无结晶,透明性得到改善,玻璃化转变温度和储能模量都较PET有一定程度提高.     

聚对苯二甲酸乙二醇酯/层状双氢氧化物纳米复合材料

聚对苯二甲酸乙二醇酯(PET)/层状双氢氧化物(LDHs)纳米复合材料是一种性能优异并具有广泛应用前景的新型聚合物基纳米复合材料.与纯PET相比, 其力学性能、热稳定性、阻燃性能与耐紫外线功能等均有明显提高或改善.本文对近年来PET/LDH纳米复合材料的研究进展进行了综述.首先, 对LDHs 的化学组成和结构特点进行了简要介绍, 并且对其制备方法和物理化学性质等进行了简单论述, 然后, 对PET/LDH纳米复合材料的制备、结构表征、结晶行为、机械力学性能以及耐热、阻燃和耐紫外线等功能性质的最新研究进展进行重点综述; 最后, 对其应用前景进行展望.     

聚对苯二甲酸-己二酸丁二酯/聚3-羟基丁酸酯4-羟基丁酸酯共混材料的制备及性能表征

采用熔融共混制备了聚对苯二甲酸-己二酸丁二酯(poly(butylene adipate-co-terephthalate),PBAT)与聚3-羟基丁酸酯4-羟基丁酸酯(poly(3-hydroxybutyrate-co-4-hydroxybutyrate),P34HB)的共混材料。研究了P34HB含量(0 wt%, 5 wt%、 10 wt%、 15 wt%、 20 wt%)对共混材料熔体流动性能、力学性能、热性能和界面微观形貌的影响,及其PBAT/P34HB吹塑薄膜的力学性能和氧气阻隔性能。结果表明,P34HB的加入降低了材料的熔体黏度,提高了材料的流动性以及薄膜的直角撕裂性能、穿刺性能和氧气阻隔性能。当P34HB含量为5wt%时,共混材料综合性能最佳,两相相容性良好,共混材料和吹塑薄膜均具有优异的力学性能,薄膜的拉伸性能和穿刺强度最高,是性能优异的包装和农膜材料。     

大区域取向对非晶态聚对苯二甲酸乙二酯结晶的影响

ffects of the chain orientation in the global sense on the solvent induced crystallization (SINC),diffusion velocity of toluol into poly(ethylene terephtlialate)(PET)and crystallization morphology were:studied by using density measurement and SEM.It has been shown that the SINC and diffusion velocity of toluol into PET increase with increasing degree of chain orientation in global sense,and the chain orientatioll can be essentially remained during SINC.     

对苯二甲酸单异辛酯的合成

以对苯二甲酸、氯化亚砜、异辛醇为原料，经过酰化、酯化两步合成了对苯二甲酸单异辛酯，收率40．4％,纯度99．0％。     

超临界甲醇降解对苯二甲酸丁二酯的研究

作为一种综合性能优良的新型工程塑料,对苯二甲酸丁二酯(PBT)工程塑料及其各种合金在全球范围内已经广泛用于电子电气、汽车、机械及民用等各个领域,而中国是其中需求量最大的国家．     

Synthesis and Characterization of Polyester-Based Nanocomposite

Recently, unsaturated polyester resin (UPR) and silica nanocomposite prepared by mechanical process is the one of the promising composite materials. In this study, the effects of silica as filler on mechanical, thermal, and morphological properties of unsaturated polyester-based composite were investigated. Mechanical properties such as tensile strength, elongation and Young's modulus increase with the addition of silica nanoparticle up to 1.0 wt%, and then decrease, over 1.0 wt%. Morphological surface of composite reveals that well-dispersed silica in the matrix occurred in low concentration. However, increasing of silica concentration causes aggregation of particles. Enhancement of mechanical properties strongly corresponds to strong adhession force of silica with the matrix and it influnced by well-disperse silica particles on the whole surface of composite. Thermal characterization and analysis of major functional group of the composites were also performed and described in this paper.     

Synthesis and Characterization of Polyaniline/Mesoporous SBA‐15 Nanocomposite

Mesoporous silica SBA‐15 with conducting polyaniline inside the pore channels was synthesized and nanocomposite formation was confirmed by means of X‐ray diffraction, transmission electron microscopy and via an N₂ adsorption isotherm. The nanocomposite was subsequently used as a dispersed phase in electrorheological (ER) fluids, and the ER effect has been demonstrated for the first time using a rotational rheometer with high voltage generator.     

Synthesis and Characterization of PE-g-MA/MgAl-LDH Exfoliation Nanocomposite via Solution Intercalation

Anorgano modifiedMgAl layereddoublehydroxide (OMgAl LDH )wassuccessfullyexfoliatedinthexylenesolutionofpolyethylene grafted maleicanhydride (PE g MA )underre fluxingcondition .APE g MA/MgAl LDHexfoliationnano compositewasformedaftertheprecipitationofPE g MAfromthedispersionsystem .ThestructureandthermalpropertyofthePE g MA/MgAl LDHexfoliationnanocompositewerechar acterizedbyX raydiffraction (XRD ) ,transmissionelectronmicroscopy (TEM ) ,andthermogravimetryanalysis (TGA ) .The…     

Cyanate Ester/Functionalized Silica Nanocomposite: Synthesis,Characterization and Properties

In this paper silica nanoparticles with covalently grafted polymer chains were incorporated into bisphenol A dicyanate ester (BADCy) to prepare composites which resulted in improvements in the mechanical and thermal properties. Fourier‐transform infrared (FT‐IR) spectroscopy transmission electron microscopy (TEM) and thermogravimetric analysis (TGA) were employed to examine the surface functionalization of silica nanoparticles. The effects of functionalized SiO₂ (F‐SiO₂) on the curing reactivity mechanical and thermal properties of BADCy resin were investigated systematically. The curing reaction of the system was facilitated with the addition of F‐SiO₂. Meanwhile compared with the neat resin the incorporation of appropriate content of modified F‐SiO₂ can enhance the mechanical properties including impact flexural strengths and fracture toughness K_IC of BADCy resin. In addition the thermal stability of BADCy/F‐SiO₂ nanocomposites is also superior to that of pure BADCy resin.     

导电聚苯胺与磁性CoFe2O4纳米复合物的制备与表征

在利用HNO3酸化处理CoFe2O4磁性纳米粒子使其表面离子化、分散性得到改善的基础上, 采用原位聚合法制备了具有电磁功能的聚苯胺/CoFe2O4 (PANI/CoFe2O4)纳米复合物. 借助TEM, XRD, FT-IR, TG, 四探针电导率仪、VSM(振动样品磁强计)等分析手段研究了复合物的形貌、结构、热稳定性及电磁性能. 结果表明, 处理过的CoFe2O4磁性纳米粒子可形成分散均匀的PANI/CoFe2O4纳米复合物, CoFe2O4以25 nm左右的粒子分散于聚苯胺基体中; PANI与CoFe2O4之间存在化学键合作用, 正是这种作用使复合物热稳定性得以提高; 复合物同时具有导电性和磁性能, 且随CoFe2O4含量变化而变化.     

纳米CdSe与聚4-乙烯基吡啶盐的复合与表征

用巯基乙酸作稳定剂在水相中合成了CdSe纳米颗粒. 聚4-乙烯基吡啶季铵盐(PVPNI)通过静电作用与CdSe纳米颗粒复合形成了纳米复合材料.该复合材料通过红外光谱数据（IR）、电感耦合等离子发射光谱（ICP-AES）、透射电镜（TEM）等方法进行了表征,并通过紫外可见吸收光谱(UV-Vis)和荧光光谱(PL)对其光学性质进行了研究.结果表明,复合材料的形成,改善了纳米CdSe的分散性,并提高了纳米CdSe的荧光强度.     

Ag2S/Al2O3纳米复合物的水热合成及表征

采用水热技术结合煅烧的方法,成功制备了Ag2S/Al2O3纳米复合物。 通过SEM、EDX、XRD等测试技术对产品进行了表征,证明得到的产品是Ag2S/Al2O3纳米复合物;无孔Al2O3和多孔Al2O3作反应模板得到的复合物的形态和分布不同。