锆螯合物交联丙烯酸酯共聚物无皂水溶胶的研究Ⅰ丙烯酸酯三元共聚物合成条件对无皂水溶胶性能的影响

三乙醇胺螯合锆烷氧化物;交联反应;锆螯合物交联丙烯酸酯共聚物无皂水溶胶的研究 Ⅱ锆螯合物与丙烯酸酯三元共聚物无皂水溶胶的交联反应     

锆螯合物交联丙烯酸酯共聚物无皂水溶胶的研究Ⅰ丙烯酸酯三元共聚物合成条件对无皂水溶胶性能的影响

三乙醇胺螯合锆烷氧化物;交联反应;锆螯合物交联丙烯酸酯共聚物无皂水溶胶的研究 Ⅱ锆螯合物与丙烯酸酯三元共聚物无皂水溶胶的交联反应     

锆螯合物交联丙烯酸酯共聚物无皂水溶胶的研究Ⅱ锆螯合物与丙烯酸酯三元共聚物无皂水溶胶的交联反应

研究了三元丙烯酸酯共聚物(MMA/BA/AA)无皂水溶胶中加入三乙醇胺锆螯合物对水溶胶及涂膜性能的影响. 在水溶胶中,螯合物增加了共聚物的亲水性,改变了水溶胶的流变性、稳定性、表面张力. 螯合物也提高了共聚物涂膜的耐水性. X光电子能谱(XPS)研究表明,在固化成膜过程中螯合物与共聚物发生交联反应,用IR、1H NMR、DSC、TGA和UV等分析方法对其交联机理作了初步探讨.     

丙烯酸酯共聚物无皂水溶胶流变性能的研究

合成了不含均聚物的丙烯酸酯四元共聚物(MMA/BA/AA/HEMA)。用GPC测定了共聚物的分子量及分子量分布。将共聚物中的羧基中和后制成无皂水溶胶。研究了水溶胶的流变性、表观粘度与剪切速率关系、表观粘度与固含量关系。所得无皂水溶胶涂料具有较优异的性能。     

金属离子络合交联丙烯酸酯共聚物无皂水溶胶涂料 Ⅰ.丙烯酸酯共聚物的合成和表征

金属离子络合交联丙烯酸酯共聚物无皂水溶胶涂料Ⅰ．丙烯酸酯共聚物的合成和表征杨立群谢志明李卓美＊（中山大学高分子研究所广州５１０２７５）关键词交联丙烯酸酯共聚物，无皂水溶胶，水性涂料，合成１９９７－０６－１６收稿，１９９８－０１－０８修回广州市科委科技...     

锆螯合物交联丙烯酸酯共聚物无皂水溶胶的研究Ⅱ锆螯合物与丙烯酸酯三元共聚物无皂水溶胶的交联反应

研究了三元丙炮酸酯共聚物（MMA／BA／AA）无皂水溶液中加入三乙醇胺锆螯合物对水溶胶及涂膜性能的影响，在水溶胶中，螯合物增加了共聚物的亲水性，改变了水溶胶的流变性、稳定性、表面张力、螯合物也提高了共聚物涂膜的耐水性，X光电子能谱（XPS）研究表明，在固化成膜过程中螯合物与共聚物发生交联反应，用IR、^1HNMR、DSC、TGA和UV等方法对其交联机理作了初步探讨。     

丙烯酸酯共聚物无皂水溶胶稳定性的研究

用溶液聚合法合成了四种AA含量不同的丙烯酸酯共聚物(MMA/BA/HEMA/AA)，通过中和AA使共聚物带有—COO~-能起自乳化作用分散于水中而成为无皂水溶胶．TEM观察表明水溶胶粒子呈球状，单分散性好，粒径随AA含量增加而变小，在30～90 nm范围．用电导滴定法测定水溶胶粒子中—COOH和—COO~-的分布，表明绝大部分—COO~-处于粒子表面，并且随AA含量增加，粒子表面的—COO~-增多，Zeta电位增大，这是导致水溶胶的抗电解质稳定性(以C.C.C.值反映)和贮存稳定性(以表现粘度反映)随AA含量增加而提高的主要原因。     

丙烯酸酯共聚物涂膜中钛螯合物的交联作用

用红外光谱、紫外光谱、差示扫描量热等手段表征了掺杂体系内钛螯舍物(Ti-Ac)与丙烯酸酯共聚物的相互作用。测试了Ti-Ac用量对涂膜耐水性、耐热性及复溶性的影响。鲒果表明。当ωTi-Ac=0．015时涂膜的吸水率可下降到1％以下。且涂膜仍保持较好的复溶性(15s)。     

过渡金属乙酰丙酮螯合物的体积排除色谱研究

用体积排除色谱方法研究了过渡金属Fe(Ⅲ)、Co(Ⅲ)、Cu(Ⅱ)、Ni(Ⅱ)的乙酰丙酮螯合物在四氢呋喃溶液中的加合和缔合行为。在溶液中乙酰丙酮钴(Ⅲ)以单个螯合物分子的形式存在,乙酰丙酮铜(Ⅱ)和乙酰丙酮铁(Ⅲ)与溶剂加合生成加合物,乙酰丙酮铁(Ⅲ)除加合物外还存在缔合度为2-10的多分散缔合物,乙酰丙酮镍(Ⅱ)水合物在四氢呋喃中产生了加合交换作用,同时存在缔合度为6左右的缔合物。色谱数据给出了螯合物、加合物及缔合物的相对含量。螯合物与相同分子量的聚苯乙烯相比,其保留体积的滞后以Ni相似文献   

金属离子络合交联丙烯酸酯共聚物无皂水溶胶涂料 Ⅱ.Zn(NH_3)_4~(2 )交联无皂水性涂料的性能

金属离子络合交联丙烯酸酯共聚物无皂水溶胶涂料Ⅱ．Ｚｎ（ＮＨ３）２＋４交联无皂水性涂料的性能杨立群谢志明李卓美＊（中山大学高分子研究所广州５１０２７５）关键词交联丙烯酸酯共聚物，无皂水性涂料，流变性，耐热性，硬度１９９７－０６－１６收稿，１９９７－１２...     

丙烯酸酯共聚物无皂水溶胶与金属离子的络合交联

用交联剂M（NH3）42＋（M2＋为Zn2＋、Cu2＋、Ni2＋和Co2＋）络合交联丙烯酸酯无皂水溶胶形成涂膜,用差示量热法和重量分析法考察了涂膜的交联程度,得出一致的结论,均表明交联剂Zn（NH3）42＋的交联效果最佳,适宜的交联固化条件是80℃加热30min;用透射电镜观察到Zn（NH3）42＋与丙烯酸酯水溶胶形成交联网状结构的过程;还用差示扫描量热法初步分析了交联反应的动力学,求出反应级数为3．3,活化能为34．0kJ·mol-1。     

Thermal degradation behaviour of some metal chelate polymer compounds with bis(bidentate) ligand by TG/DTG/DTA

Seven novel divalent transitional metal chelate polymers compounds (commonly known as chelate compounds or metal coordination complexes or polymer complexes) have been characterized by thermogravimetry (TG), differential thermal gravimetry (DTG) and differential thermal analysis (DTA) methods. Thermal decomposition behaviour of Mn(II), Co(II), Ni(II), Cu(II), Zn(II), Cd(II) and Hg(II) polymers with terphthaoyl-bis(p-methoxyphenylcarbamide) has been investigated by thermogravimetric analysis (TGA) at heating rate 10 °C min^?1 under nitrogen atmosphere. TG/DTA of chelate compounds were shown to be a stable compound against thermal decomposition which was measured on the basis of final decomposing temperature, but it is observed in some curves that decomposition takes place at low temperature due to the lattice water, which is always placed at outer coordination sphere of the central metal ion. The presence of both lattice and coordinated water were noteworthy investigated in Co(II), Ni(II) and Cu(II) chelate polymer compounds, whereas lattice water found in Zn(II), Cd(II) and Hg(II). However, Mn(II) showed only coordinated water. Thermal stabilities for release of lattice water, coordinated water and organic moiety that occur in sequential decomposition of chelate compounds are explained on the basis of ionic size effect and electronegativity. The processes of thermal degradation taking place in seven chelate polymers were studied comparatively by TG/DTG/DTA curves which indicating the difference in the thermal decomposition. Coats–Redfern integral method is used to determine the kinetic parameters for the successive steps in the decomposition sequence of TG curves. Scanning electron microscope images of some chelate polymers were shown in previous publication revealed that particle sizes of chelate polymers were found to be of nanomaterial level therefore, resulting chelate compounds might be called as nanomaterial.     

四甲基苯二甲基二异氰酸酯基水性聚氨酯的合成和性能

采用四甲基苯二甲基二异氰酸酯、聚酯二元醇和二羟甲基丙酸为原料,合成了一系列具有不同异氰酸根与羟基摩尔比（n(-NCO)/n(-OH)）的聚氨酯乳液。 研究了n(-NCO)/n(-OH)对水性聚氨酯性能的影响。 结果表明,当该比值增加时,乳液的粒径增大,分布变宽,结晶性降低,耐热性下降,耐水性能呈现降低的趋势。 当异氰酸根与羟基摩尔比为3时,四甲基苯二甲基二异氰酸酯基水性聚氨酯的乳液粒径为10～30 nm,膜的分解温度达到275 ℃,24 h吸水率低于10%。     

Macromolecular nature of nanosheets of quasi‐TiO2 from (tetra‐isopropyl)orthotitanate modified by methacrylic acid

In this paper we concentrate on the general behavior of oxotitanium hydrosol, which was earlier developed by us as a precursor of the TiO₂ nanoparticles and nanocomposite. The oxotitanium hydrosol was synthesized by the chemical decomposition of a molecular complex of the methacrylic acid/(tetra‐isopropyl)orthotitanate (MAA/TIPT) by means of the hydrogen peroxide. The raw product chemical decomposition of MAA/TIPT is the colloidal suspension of the oxotitanium compound in the water. The oxotitanium compound was separated from hydrosol and identified on the basis of X‐ray and Raman spectroscopy investigations. The status of water in the hydrosol was also investigated by the Raman spectroscopy. The photophysical behaviors of the oxotitanium hydrosol on the basis of the light absorption and photoluminescence (PL) investigations are presented. The light absorption (260 nm) and PL emission (313 nm) allow us to identify the inorganic phase of hydrosol as nanosheets' crystallites of quasi‐TiO₂. Macromolecular nature of nanosheets of quasi‐TiO₂ was revealed only for a higher concentration solution of nanosheets' crystallites of quasi‐TiO₂ at the hydrosol. A macromolecular nature of nanosheets of quasi‐TiO₂ by the red shift of absorption edge and PL wavelength with increase in the concentration of the oxotitanium hydrosol as well as the formation of hydrogels and birefringence developed under an influence of mechanical shearing is evidenced. Copyright © 2009 John Wiley & Sons, Ltd.     

树脂交换法制备白炭黑溶胶

用白炭黑溶胶作造纸工业的添加剂,可以改进纸的滞留性和脱水性,将带有阴离子的白炭黑溶胶与一些阳离子聚合物一起使用,效果更佳。在造纸工业中添加的白炭黑溶胶粒径应在4～7nm,比表面为700～300m^2／g,稳定性好,传统方法制备的白炭黑溶胶难于达到此要求。本文对用树脂交换法制备白炭黑溶胶的条件、影响因素、最佳工艺进行了探讨。     

Influence of the Heating Rate in the Thermal Decomposition of HMX

This work refers to a study of the thermal decomposition of octahydro-1,3,5,7-tetranitro-1,3,5,7 tetrazocine (HMX) by differential scanning calorimetry (DSC) in non-isothermal conditions, with heating rates from1 to 25°C min⁻¹. The influence of the heating rate, the particle and the sample size were verified. The activation energy was calculated using the peak temperature shift method, proposed by Ozawa and a significant variation in the results was observed according to the range of the used heating rates. As the heating rate was increased, different conversions and self-heating effects were observed at the respective DSC peaks, indicating that the use of this method was inadequate and it may lead to incorrect results, which, in turn, could explain the wide range of activation energy values published in literature. At lower heating rates HMX decomposition occurs on the solid state and at higher ones decomposition occurs after melting practically at the same temperature, which does not depend on the heating rate. This revised version was published online in July 2006 with corrections to the Cover Date.     

丙烯酸树脂水溶胶的乳液法合成

描述了通过乳液聚合方法合成丙烯酸树脂水溶胶的合成方法，研究了分子量、亲水基团(羧基)含量对水溶胶粒径的影响，分析了在乳液转变成水溶胶的过程中，体系粘度、透光率、表面张力以及粒子形态的变化。     

A facile synthesis of boron nanostructures and investigation of their catalytic activity for thermal decomposition of ammonium perchlorate particles

In this research, ultrasound irradiation as a simple method was used to produce boron nanostructures. Reaction conditions such as boron concentration and sonication time show important roles in the size, morphology and growth process of the final products. The boron nanostructures (nanoparticles and nanorods) were characterized by scanning electron microscopy, transmission electron microscopy, X-ray powder diffraction, small-angle X-ray scattering and inductively coupled plasma atomic emission spectroscopy techniques. Primary evaluation of results showed that nanoparticles and nanorods of boron successfully have been prepared with 25–40 and 50–100 nm average particle size, respectively. These nanostructures (nanoparticles and nanorods) were studied as an additive for promoting the thermal decomposition of ammonium perchlorate (AP) particles. Thermochemical decomposition behaviors of treated samples were characterized by thermal gravimetric analysis and differential scanning calorimetry techniques. Also, the kinetic parameters of thermal decomposition processes of pure and treated samples were obtained by nonisothermal methods proposed by Kissinger and Ozawa. However, boron nanoparticles with the smallest average particle size (25–40 nm) have the most significant catalytic effect including the decrease in decomposition temperature of AP + B nanocomposite by 100 °C, increase in the heat of decomposition from 580 to 1354 J g^?1 and decrease in activation energy from 207 to 110 kJ mol^?1.     

Anisotropic swelling of hydrogel nanowires based on poly(vinylpyrrolidone) fabricated by single‐particle nanofabrication technique

We report a hydrogel nanowire based on poly(vinylpyrrolidone) (PVP) and N,N'‐methylenebis(acrylamide) (MBA), which have anisotropic swelling ratio for radius and length direction. The PVP/MBA nanowires were fabricated by single particle nanofabrication technique, which is a technique for the fabrication of polymeric nanowires using the single ion event, that cause the crosslinking reaction of polymer chains within the ion tracks along the ion paths; furthermore the size (length and radius) of the nanowires was controlled by changing the film thickness and amount of MBA crosslinker. The swelling behaviors in air and water were observed using atomic force microscopy. The PVP/MBA nanowires exhibited anisotropic swelling along the length and radius in aqueous environments, because the hydrogel nanowires consisted of crosslinked networks with inhomogeneous crosslinking points, which reflected the initial energy distribution from incident an ion within the ion track. © 2016 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. 2016 , 54, 1950–1956