添加剂对含FeDBC的低密度聚乙烯膜光氧化的影响

本文研究了各种添加剂对含ＦｅＤＢＣ的低密度聚乙烯（ＬＤＰＥ）膜光氧化的影响，并讨论了其作用机理。     

mLLDPE及mLLDPE／LDPE共混物薄膜性能研究

研讨了茂金属线型低密度聚乙烯（ｍＬＬＤＰＥ）薄膜和ｍＬＬＤＰＥ与低密度聚乙烯（ＬＤＰＥ）共混物薄膜的物理性能和光学性能,并与传统的ＬＬＤＰＥ薄膜和ＬＬＤＰＥ／ＬＤＰＥ共混物薄膜进行了比较,表明ｍＬＬＤＰＥ薄膜和ｍＬＬＤＰＥ／ＬＤＰＥ共混物薄膜的性能优于传统的ＬＬＤＰＥ薄膜和ＬＬＤＰ／ＬＤＰＥ共混物薄膜,指出在ｍＬＬＤＰＥ中混合１０％ＬＤＰＥ,对薄膜性能影响不大。     

利用废旧塑料制土工排水带的研究

本文通过对回收ＬＤＰＥ／ＣａＣＯ３填充、回收ＬＤＰＥ／ＨＤＰＥ共混、回收ＬＤＰＥ／ＰＰ共混体系的研究，得出了较好力学性能的土工排水带板芯的配方．     

磨盘形力化学反应器中LDPE固相力化学接枝MAH的研究

研究了磨盘碾磨中ＨＤＰＥ、ＬＤＰＥ、ＬＬＤＰＥ和ｍＰＥ的粉碎和降解以及ＬＤＰＥ的固相力化学接枝。将ＬＤＰＥ与马来酸酐共碾磨,制备了低密度聚乙烯－马来酸酐共聚物（ＬＤＰＥ－ｇ－ＭＡＨ）。采用ＩＲ、ＤＳＣ和化学滴定等方法对所制备的ＬＤＰＥ－ｇ－ＭＡＨ进行了分析表征。系统研究了磨盘转速、碾磨次数、低密度聚乙烯与马来酸酐配比等因素对产物接枝率的影响。结果表明,通过磨盘碾磨的力化学反应,ＭＡＨ在ＬＤＰＥ上的     

接枝LDPE与PET共混物的热力学性能和形态研究

通过红外光谱对合成的三种极性单体接枝ＬＤＰＥ进行了确证，采用热分析仪和扫描电镜研究了接枝ＬＤＰＥ／ＰＥＴ共混物的热力学性能和相形态结构。结果表明，接枝ＰＤＰＥ与ＰＥＴ共混，对ＰＥＴ结晶过程有一定的加速促进作用；由缺口冲击断面观察发现，接枝ＬＤＰＥ以分散相分布在ＰＥＴ连续相中，但相界面之间有丝状物相连，说明接枝ＬＤＰＥ与ＰＥＴ有较好的相容性。     

含淀粉与光敏剂的LDPE膜可控光生物降解

研究了含超淀粉及硬脂酸铁或Ｎ,Ｎ－二正丁基二硫代氨基甲酸铁／Ｎ,Ｎ－二正丁基二硫代氨基甲酸镍光敏剂的低密度聚乙烯膜光氧化降解羰基指数,粘均分子量和真菌侵蚀（级）的变化。结果表明,只需在ＬＤＰＥ膜中添加５％－１５％淀粉和０．１％－０．３％ＦｅＳｔ３或０．０５％－０．２０％ＦｅＤＢＣ／ＮｉＤＢＣ光敏剂,在自然曝露条件下可控ＬＤＰＥ膜的使用寿命 。     

LDPE悬浮聚合接枝PS及其表征

研究了ＬＤＰＥ悬浮接枝ＰＳ合成ＬＤＰＥ－ｇ－ＰＳ接枝共聚物的工艺，此接枝共聚物可作为某些聚合物共混的相容剂。讨论了苯乙烯溶胀ＬＤＰＥ时间、引发剂浓度和ＬＤＰＥ与苯乙烯投料比对接枝率的影响，发现溶胀时间为４ｈ、反应时间为８ｈ、引发剂浓度为１％时、ＬＤＰＥ与苯乙烯投料比为１∶１时，其接枝共聚物接枝率最大可达３８．５％。并对ＬＤＰＥ－ｇ－ＰＳ接枝共聚物进行了ＤＳＣ、ＩＲ及接枝率测定的表征。     

MAH教枝LDPE对PET／LDPE共混物增容作用的研究

本文研究了马来酸酐在引发剂过氧化二异丙苯存在下，与ＬＤＰＥ在挤出机中进行熔融接枝反应，所得接枝物ＧＰＥ对ＰＥＴ／ＬＤＰＥ共混体系的增容作用。共混物的冲击强度及应力应变曲线结果表明，ＧＰＥ能明显改善共混体系的相容性，提高共混体系的冲击强度，仅用２０％的ＧＰＥ就能使共混物由脆性断裂变为韧性断裂。利用ＳＥＭ观察共混物的冲击断面形貌，结果表明，ＰＥＴ与ＬＤＰＥ完全不相容，ＧＰＥ能明显改善ＰＥＴ与ＬＤＰＥ共     

LDPE工艺路线评述

对ＬＤＰＥ及ＬＬＤＰＥ的生产工艺及其特点进行对比，分析了釜式法和环管法生产工艺路线的优点及不足，并参考世界上各大公司典型ＬＤＰＥ装置的技术情况，对燕山石化公司拟建ＬＤＰＥ装置的前景进行了预测。     

顺酐化三元乙丙橡胶改性PC／LDPE共混体系的研究

低密度聚乙烯（ＬＤＰＥ）可以改善聚碳酸酯（ＰＣ）的加工性能,并能在一定上改善ＰＣ的力学性能。顺酐化三元乙丙橡胶（ＭＥＰＤＭ）对ＰＣ／ＬＤＰＥ有增容作用,在ＰＣ／ＬＤＰＥ体系中加入１％左右的ＭＥＰＤＭ即可使冲击强度增加７０％。     

Electrocatalytic behaviour of several cobalt complexes: Determination of hydrazine at neutral pH

Four cobalt complexes (cobalt(II) acetylacetonate and 8-hydroxyquinolinate and cobalt(III) 8-hydroxyquinolinate and diethyldithiocarbamate) were tested as mediators to modify carbon paste electrodes with a view to obtaining a catalytic effect for the hydrazine. Cobalt(II) acetylacetonate was found to exert no catalytic effect as the likely result of ligand having to stabilize higher oxidation states of Co potentially involved in the catalytic process. The effects of the electrolyte and pH were examined and found to be important. The proposed chronoamperometric determination for hydrazine features limits of detection at the 99% confidence level of 1.6mM with cobalt(III) diethyldithiocarbamate, 1.5mM with cobalt(III) 8-hydroxyquinolinate and 2.0mM with Co(II) 8-hydroxyquinolinate. The RSD for 2mM hydrazine was always less than 8%.     

The effect of cobalt complex addition on the cure and properties of an epoxy matrix resin

The effects of adding various cobalt complexes to a tetraglycidyl methylene dianiline-based epoxy resin were determined. The addition of cobalt(III) acetylacetonate was found to alter the epoxy cure and improve the flexural strength and fracture toughness of the cured resin. These effects were not duplicated by the addition of various other cobalt complexes.     

Wave Absorption Properties of Co–C Nanoparticles Prepared by the Gaseous Detonation Method

Combustion, Explosion, and Shock Waves - Co–C nanoparticles are synthesized via the detonation of benzene and oxygen with cobalt(III) acetylacetonate as a precursor, and the influence of heat...     

Homogeneous catalytic hydrogenation of unsaturated fats: Metal acetylacetonates

Hydrogenation of linseed and soybean methyl esters was achieved at 100–180C, 100–1000 psi H₂ and 0.05–0.25 moles catalyst per mole of ester. The relative activity of metal acetylacetonates in decreasing order was: nickel (III), cobalt (III), copper (II) and iron (III). Reduction occurred readily in methanol solution but only slowly in dimethylformamide and acetic acid. No reduction occurred in the absence of solvents. Soybean oil was also hydrogenated rapidly with nickel (III) acetylacetonate in methanol, but in this system the triglycerides were converted to methyl esters. Nickel (III) acetylacetonate was the most selective catalyst toward linolenate hydrogenation. Methyl linoleate and linolenate hydrogenated with nickel(III) acetylacetonate were fractionated into monoenes, dienes and trienes. Thecis monoenes separated in 62 to 68% yield had double bonds in the original position. The remainingtrans monoenes had extensively scattered unsaturation. The dienes and trienes showed no conjugation, but some of the double bonds in the dienes were not conjugatable with alkali. Little stearate was formed. Presented at AOCS meeting in Chicago, 1964 No. Util. Res. and Dev. Div. ARS, USDA     

Metal acetylacetonates as latent accelerators for anhydridehyphen;cured epoxy resins

Twenty-two metal acetylacetonate compounds have been evaluated as possible latent accelerators for epoxy-anhydride solventless resins. Experimental data have revealed that titanium (IV) oxyacetylacetonate, chromium (III), zirconium (IV), cobalt (III), and cobalt (II) acetylacetonates are particularly effective with anhydride cured epoxy resins. When added to the resin at a level of 0.05–0.10% (w/w), they provide very fast gel times at 150–175°C combined with very good storage stabilities (> six months) at room temperature. The power factor values of cured resin samples, containing these preferred metal acetylacetonates, have been found to be between 2.0 and 2.5% at 150°C and 60 Hz. Correlation between the catalytic effectiveness of these metal acetylacetonates, as latent accelerators for epoxy-anhydride resins, and their thermal stabilities suggest that decomposition products may be the active species responsible for initiating polymerization in epoxyanhydride resin systems.     

Co/Mn/Zr复合催化剂催化甲苯液相氧化

以乙酰丙酮锆或乙酸锆与乙酸钴和乙酸锰制备乙酸钴/乙酸锰/乙酰丙酮锆或乙酸锆(Co/Mn/Zr)三元复合催化剂。比较乙酸钴(Co)、乙酸钴/乙酸锰(Co/Mn)和Co/Mn/Zr催化剂体系对甲苯液相氧化反应的催化性能。结果表明:在催化剂中添加Zr可以降低反应温度,提高甲苯转化率和苯甲酸选择性。与乙酸锆相比,采用乙酰丙酮锆制得的Co/Mn/Zr具有较好的催化活性。在Co,Mn和Zr物质的量之比为5 5 1,Co与甲苯的物质的量之比为1 10 000,溶剂乙酸与甲苯质量比为1 2.3,反应温度160℃和反应压力1.4 MPa的条件下反应3 h后,苯甲酸选择性和甲苯转化率分别为80.2%和15.4%。     

Influence of Chromium(III) Ions Photochemical Decomposition of t-Butylhydroperoxide

Abstract

The presence of chromium(III) in form of acetylacetonate increases the quantum yield of t-butylhydroperoxide photolysis in benzene solutions at 300–400 nm.

So, the 0.2 M hydroperoxide solution containing 0.0005 M chromium(III) acetylacetonate exhibits the quantum yield of photolysis which is cca 25 times higher than that of hydroperoxide alone. The phenomenon is explained in terms of peroxy-radicals coordinated in the ligand field of metal ion.     

Hydrothermal gasification of glucose using Raney nickel and homogeneous organometallic catalysts

Catalytic gasification of biomass to fuel gaseous in sub and super critical water is a promising method for production of sustainable energy. In this paper, a microreactor has been utilized to study the hydrothermal gasification of glucose in the presence of transition metal chelates consisting of nickel(II) acetylacetonate (Ni(acac)₂), cobalt(II) acetylacetonate (Co(acac)₂), iron(III) acetylacetonate (Fe(acac)₃) and Raney-nickel particles. The reaction temperature and pressure were 310–350 °C and 100–210 bar, respectively. Effects of addition of catalysts, reaction temperature, reaction time, glucose concentration and liquid water volume fraction on the amount of the generated gas as well as its composition were investigated. Results indicated that the presence of the organometallic compounds can slightly facilitate the rate of decomposition of glucose. This enhancement in reaction rate was more pronounced at higher concentrations of the feed (~ 0.65 M) compared with lower concentrations (~ 0.06 M). In contrast to these homogeneous catalysts, Raney-nickel catalyst improved the gas yield by a factor of 3 to 5. It has been observed that the amount of the produced gas almost doubles when the batch time increased from 3 to 30 min, while no significant change was observed from 30 to 60 min. Finally, remarks on optimization of the amount of added water into the reaction vessel are provided.     

新癸酸钴中不同氧化态钴的分离及测定

研究新癸酸钴中不同氧化态钴分离及测定的方法。根据二价钴和三价钴与乙酰丙酮形成的配合物溶解性的不同,实现不同氧化态钴的有效分离;根据配合物稳定常数的不同,利用络合滴定法,测定新癸酸钴中二价钴含量。用本方法对自制及市售新癸酸钴样品的进行分离及测定取得满意的效果。     

Development of potentially degradable materials for marine applications. III. Polyethylene-polyethylene oxide blends

The effect of a simulated marine environment on unstabilized polyethylene-polyethylene oxide blends, having varying polyethylene oxide content (up to 40% by weight), with or without a metal catalyst (e.g., cobalt (III) acetylacetonate) and a metal containing plasticizer (e.g., aluminum stearate), has been studied for 10 weeks exposure time. In the absence of metal catalyst and plasticizer, phase separation of polyethylene oxide was quite evident visually after melt mixing and subsequent regular compression molding of polyethylene-polyethylene oxide blends. However, these blends rendered better and uniform mixing in the presence of metal catalyst and plasticizer. Since polyethylene oxide is a water soluble component of the system, % weight loss increased significantly with increase in its content after exposure to brine. These blends have been further characterized by tensile properties, optical and scanning electron microscopy, and thermal analysis in order to monitor mechanical as well as morphological changes.