二元-三元羧酸镧复合热稳定剂的制备和应用

以常见的二元羧酸和三元羧酸以及硝酸镧为原料,制备了一系列二元-三元羧酸镧复合热稳定剂产品。通过刚果红试纸法和转矩流变仪法对产品的性能进行了表征,结果表明,己二酸-柠檬酸镧和癸二酸-氨三乙酸镧对PVC的热稳定性最好,动态热稳定时间分别为1 080 s和1 188 s。用五因素三水平正交试验优选出两组较优配方,对PVC的静态热稳定时间分别可达93 min和85 min。     

PVC热稳定剂——羧酸疏基乙酯锑的合成及性质

以Sb2O3和HSCH2CH2OH为原料合成Sb(SCH2CH2OH)3;再将Sb(SCH2CH2OH)3与RCOOH反应,以钛酸丁酯作催化剂,二甲苯为溶剂,加热回流反应,得到酯锑。产品的热稳定性能测试表明：当逆酯锑的添 加量为2％时,PVC树脂的热稳定时间为8－40min(200℃）。还对该类热稳定剂对PVC的热稳定机理进行了初步探讨。     

月桂酸稀土复合热稳定剂对PVC热稳定作用的研究

合成了月桂酸镧/铈/钕,分别与硬脂酸钙、季戊四醇复配得到了硬质PVC用月桂酸稀土复合热稳定剂。采用刚果红法、转矩流变仪、动态力学谱仪等考察其对PVC热稳定性、流变性能、力学性能的影响,利用红外光谱初步探讨了其热稳定机制。结果表明:稀土复合热稳定剂中月桂酸镧(铈/钕)/硬脂酸钙/季戊四醇最佳比例为3∶1∶1;具有良好的热稳定性,静态、动态热稳定时间均达到为90和50 min以上;其加工性能和力学性能与铅盐体系相当,断裂伸长率明显高于铅盐体系。     

二元羧酸二(二茂镱)的合成

本文报道了五个新的二元羧酸二(二茂镱)的合成:(COO)_2Yb_2(C_5H_5)_4(1),CH_2(COO)_2Yb_2(C_5H_5)_4(2),(CH_2COO)_2Yb_2(C_5H_5)_4(3),o-C_6H_4(COO)_2Yb_2(C_5H_5)_4(4),p-C_6H_4(COO)_2Yb_2(C_5H_5)_4(5),并考察了它们对空气的稳定性。     

镉与羧酸及二咪唑化合物的合成及表征

以镉离子,间苯二酸阴离子(m-bdc)和1,5-二(1-咪唑基)戊烷(biim-5),合成了一种新型化合物[Cd(m-bdc)(biim-5)]*H2O(1),该化合物为二维层状结构.还研究了该化合物的荧光性质和热稳定性(TGA).     

2,4-二羟基二苯甲酮镧对PVC热稳定性能的影响

通过2,4-二羟基二苯甲酮(BP)与稀土镧离子配位,合成了2,4-二羟基二苯甲酮镧(LBP)。用元素分析、红外分析、热分析等对配合物进行了表征。同时用刚果红试纸法和高温热老化箱,探讨了配合物以及配合物与硬脂酸锌(ZnSt₂)、硬脂酸钙(CaSt₂)、季戊四醇(PE)复配对PVC热稳定性能的影响。结果表明：2,4-二羟基二苯甲酮镧的分子式为：La₂(C₁₃H₈O₃)₃·5H₂O。当配合物单独添加到PVC中时,热稳定性能一般,但当以m(LBP)∶m(ZnSt₂)∶m(PE)=2∶1∶2进行复配后,热稳定时间长达81min,并且抗变色效果最好。由热稳定机理研究得出,2,4-二羟基二苯甲酮镧可以与PVC受热分解出的氯化氢反应,生成LaCl₃,降低氯化氢对PVC的催化降解,进而增强PVC的热稳定性能。     

羧酸对复合羧酸镧热稳定剂性能的影响

以常见的一元羧酸、二元羧酸、三元羧酸和硝酸镧为原料,合成复合羧酸镧热稳定剂,采用刚果红法对产品对PVC的静态热稳定性进行表征,探讨不同羧酸之间的协同效应,进而通过转矩流变仪法对产品对PVC的动态热稳定性进行测试,并通过红外光谱对产品结构进行表征。结果表明:一元羧酸和二元羧酸之间的协同效应最好,且以硬脂酸/己二酸镧性能最佳,对PVC的动态热稳定性可达1420 s。     

ICP-AES法快速分析聚氯乙烯中复合热稳定剂

聚氯乙烯（PVC）的热稳定性较差,在加工过程中必须通过添加2％～4％热稳定剂才能有效地阻止其热降解。工业上广泛应用铅、镉、钡、钙、锌的硬脂酸盐或油酸盐等的复合物作为PVC的复合热稳定剂,通常是二元或三元复合体系,如铅钡、镉钡、镉钡锌、钙锌体系等,由于体系内组分之间有协同热稳定性,不仅使PVC加工时期的色泽好,而且有非常好的长期稳定性。     

一茂二元羧酸镱的合成

本文报道了五个新的一茂二元羧酸镱的合成:o-C_6H_4(COO)_2YbC_5H_5(1),(CH_2COO)_2YbC_5H_5(2),(CHCOO)_2YbC_5H_5(3),CH_3(COO)_2YbC_5H_5(4),(COO)_2YbC_5H_5(5),这些络合物均经元素分析和红外光谱鉴定。可能由于这些络合物具有螯合环的结构,所以它们在空气中的隐定性较强。     

二烃基锡糠基羧酸酯的合成及其结构表征

合成了１２个二烃基锡糖基羧酸酯。利用元素分析,ＩＲ和＾１Ｈ ＮＭＲ表征这些化合物的组成和结构。     

Synthesis of silica-pillared layered lanthanum titanate with high thermal stability

It is now well established that layered solids other than smectite clays may bepillared to form three-dimensional crosslinked materials, the porosity of which isultimately tunable by the nature of the host substrate and the chemical species     

Synthesis,characterization and evaluation of long-acting hyperbranched cationic polymer clay stabilizer used in water flooding

In the process of waterflooding development, it is of great importance to prevent the clay from hydration swelling and migration dispersion for protecting the formation and improving the water flooding efficiency. For those reasons, we successfully synthesized a cationic clay stabilizer (HBP-QAT) through melting polycondensation and cationic modification with maleic anhydride, diethanolamine, epichlorohydrin, triethylamine, and trimethylolpropane as monomers and p-toluene sulfonic acid as a catalyst. The chemical structure, cation degree, and molecular weight of HBP-QAT were studied by using FTIR, ¹H NMR, sodium tetraphenylborate (STBP) back titration, and gel permeation chromatography (GPC). The obtained results showed that HBP-QAT was a hyperbranched unsaturated polyester amide with a low molecular weight and a high cation degree, with corresponding values of 28400, and 44.2%, respectively. The clay stability and durability of HBP-QAT were evaluated by linear anti-swelling, water flushing, and cutting rolling recovery tests. The obtained results showed that HBP-QAT has an excellent anti-washing capacity and a long-term inhibition effect. The initial anti-swelling rate of 1.0 wt% HBP-QAT reached 92.37%, and the anti-swelling rate of 1.0 wt% HBP-QAT also remained at 85% after flushing 10 times with water. Besides, the two cutting rolling recoveries exceed 72%. Most importantly, the inhibition mechanism of HBP-QAT was studied by zeta potential, X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscope (SEM), and contact angles analyses, and thus we proposed an inhibition mechanism, presenting as follows. HBP-QAT inhibited the clay hydration swelling by neutralizing negative charges on the surface of the clay particles to compress the electric double layer, strongly adsorbing on the surface of the clay particles, and forming a waterproof polymer membranes, restraining water of intrusion into the clay interlayer.     

核壳结构的Beta-Y复合分子筛的合成与表征

采用两种不同的水热晶化法合成Beta-Y复合分子筛,并采用XRD、SEM-EDS、FT-IR、N₂ 吸附-脱附技术对其进行表征。结果表明,以Beta分子筛为唯一硅源合成的sample A具有Y和Beta分子筛两种晶型结构,为机械混合形式;而以Beta分子筛母液为前躯体合成的sample B为核壳结构的复合分子筛,具有Y和Beta分子筛两种晶型结构,其核相为Beta分子筛,壳层为Y型分子筛,其晶体中具有介孔结构,并且介孔孔径比较集中。     

Incorporation of Cadmium Ions and Cadmium Sulfide Particles into Sol-gel Zirconium Phosphate. Synthesis,thermal behavior and X-ray characterization

The inorganic ion-exchanger α-zirconium phosphate was synthesized by the sol-gel method and its properties relating to the exchange of Cd²⁺ and the intercalation of CdS particles were studied. The Cd²⁺-exchange process is a fast process and the material obtained exhibits an increased interlayer distance d with respect to its precursor (9.56 vs. 7.56 Å). The resulting Cd-containing material was exposed to aH₂S gas flow to give CdS particles in the exchanger. The zirconium phosphate containing CdS particles still possesses a layered structure, with a pattern almost identical to that of the initial ion-exchanger precursor. Moreover, the material may exchange further Cd²⁺ and hence lead to a higher CdS particle content. The thermal behavior of this ion-exchangers containing Cd²⁺ or CdS particles was studied.     

Permeability and thermal properties of PDMS/LDPE multilayer composite membranes

This work reports on the preparation and properties of polydimethylsiloxane (PDMS)/low‐density polyethylene (LDPE) multilayer composite polymer membranes (MCPM) for gas separation applications. The membranes were produced by combining sequential coating with melt‐extrusion/salt leaching techniques. In particular, the gas sorption and permeation properties at different pressure (40–90 psig) and temperature (27–55 °C) are reported with morphology and thermogravimetric properties. The results show that a 20 μm PDMS layer was able to penetrate the microporous LDPE surface layer substrate leading to improved interfacial adhesion. Based on the different gases (CO₂, CH₄, and C₃H₈) solubility, permeability, and diffusivity obtained, these membranes are seen as good candidates for industrial gas separations. © 2018 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. 2018 , 56, 1045–1052     

On the solubility of lanthanum oxide in molten alkali fluorides

The solubilities of lanthanum oxide in LiF, NaF, KF and eutectic melt LiF-NaF-KF (46.5 mole% LiF; 11.5 mole% NaF and 42.0 mole% KF) were measured in order to find the suitable electrolyte for electrodeposition of lanthanum. Solidus-liquidus lines were obtained by the method of thermal analysis. The solubility of lanthanum oxide in alkali fluorides is rather low and decreases in the order LiF>NaF>KF. It was found that lanthanum oxide reacts with the components of the melt. LaOF and alkali metal oxide are formed during dissolution of La₂O₃ in the melt.     

Synthesis,characterization, and thermal studies of cardanol-based polyphosphate esters

Polyphosphate esters were synthesized from derivatives of cardanol phosphorodichloridateates and dihydric phenols by interfacial polycondensation using a phase transfer catalyst. The polymers were characterized by IR, ¹H-, ¹³C-, and ³¹P-NMR spectroscopy, and GPC. The thermal stability and thermal degradation kinetics of the polymers were determined by thermogravimetry. The flammability of the polymers was evaluated by limiting oxygen index values. © 1993 John Wiley & Sons, Inc.     

Synthesis,characterization, thermal,electrical and magnetic properties of polyaniline composites with rare earth gadolinium coordination complex

Novel polyaniline/gadolinium (PANI/Gd) composites were successfully synthesized by “in‐situ” polymerization at the presence of rare earth Gd coordination complex and D‐tartaric acid (an a dopant). It is rarely to find the studies on related field to add rare earth Gd coordination complex as fillers. Fourier transform infrared (FTIR) spectra, X‐ray diffraction (XRD) and scanning electron microscope (SEM) were used to examine the structure and surface appearance characterization of materials. The thermal stability performance of composites was investigated by thermogravimetry and derivative thermogravimetry (TG‐DTG). Electrochemical performance was measured by cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS) and galvanostatic charge–discharge test. The magnetic property was investigated by physical property measurement system (PPMS). The structure and surface appearance characterization and the magnetic properties jointly demonstrate the polymerization of rare earth Gd coordination complex and PANI–D‐tartrate (DTA) not only simple physical mixing but also chemical mixing. TG‐DTG analysis suggests that thermal stability of PANI/Gd composites is higher than that of PANI–DTA. Electrochemical performance tests and SEM indicate that the composite (PANI/Gd = 3.3:1,mass ratio) has the most regular morphology and best specific capacitance. The magnetization of the composite (PANI/Gd = 3.3:1,mass ratio)is evidently smaller compared with PANI–DTA and rare earth Gd coordination complex. Copyright © 2016 John Wiley & Sons, Ltd.     

Synthesis and properties of clay-based superabsorbent composite

A novel superabsorbent composites based on acrylic acid, acrylamide, and inorganic clay mineral-attapulgite were synthesized through a solution polymerization to improve water and saline absorbencies. The superabsorbent composite was characterized by Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA) and scanning electron microscopy (SEM). The effects of saline solutions, amount of initiator, crosslinker and attapulgite on the water absorbency of superabsorbent composites were investigated. The water retention test of superabsorbent composites were also carried out. The superabsorbent composite exhibited improved water and saline absorbencies compared with that of crosslinked poly(acrylic acid-co-acrylamide) superabsorbent polymer. The water absorbency of the superabsorbent composite synthesized under optimal synthesis conditions with an attapulgite content of 10% reaches more than 1400 g H₂O/g and 110 g H₂O/g in distilled water and 0.9% NaCl solution, respectively.