Vinyl Monomers from Stearic Acid - their Characterization and Separation

A variety of vinyl monomers derived from stearic acid and stearyl alcohol have been prepared in high purity. Their separation by thin-layer and gas-liquid chromatographic techniques, as also their characterization by proton magnetic resonance spectroscopy (PMR) have been discussed.     

Copolymerisation of Vinyl Stearate with Other Fatty Vinyl Monomers

Homopolymerisation of vinyl stearate and its copolymerisation with five other fatty vinyl monomers have been carried out in benzene using benzoyl peroxide as the initiator. The comonomers included stearyl acrylate, stearyl methacrylate, allyl stearate, stearyl vinyl ether and divinyl sebacate. Stearyl acrylate and stearyl methacrylate furnished copolymers with inherent viscosities much higher than that of the vinyl stearate homopolymer while allyl stearate and stearyl vinyl ether gave copolymers with inherent viscosities much lower than that of the vinyl stearate homopolymer.     

氯乙烯／N—苯基马来酰亚胺／乙烯基单体悬浮共聚速率

根据氯乙烯（ＶＣ）／Ｎ－苯基马来酰亚胺（ＰＭＩ）／乙烯基单体悬浮共聚合工艺的特点,确定了倒加料的聚合工艺,比较了丙烯腈（ＡＮ）,甲基丙烯酸甲酯（ＭＭＡ）对ＶＣ／ＰＭＩ聚合速率的影响,研究了ＡＮ的用量和聚合温度对ＶＣ／ＰＭＩ／ＡＮ三元悬浮共聚合速率的影响。     

乙烯基单体改性水性聚氨酯的研究

以聚酯多元醇、异佛尔酮二异氰酸酯、二羟基丙酸等为原料,采用丙酮法制备了水性聚氨酯乳液,分别用甲基丙烯酸单体（MMA）、苯乙烯（St）、甲基丙烯酸六氟丁酯（FA）对其进行了改性,得到了一系列核壳结构的改性水性聚氨酯乳液,并对改性产物进行了结构表征和性能测定,结果表明：改性后的水性聚氨酯乳液形成的涂膜具有更好的机械性能、耐水性能以及耐热性能等,应用范围更广。     

Photochlorination of Stearic Acid Adsorbed on Alumina

Stearic acid adsorbed on alumina as a dense monomolecular layer was photochlorinated in the dry solid state. The results show that over 90% of the chlorination was on the ω and ω-1 positions and 8.5% on ω-2. No chlorination was detected on the other positions. This establishes the assumption that in a dense monomolecular layer only the terminal groups are exposed to chemical reaction.     

化学引发的烯类单体与酪素的接枝共聚反应的研究进展

酪素与烯类单体的接枝共聚产物广阔的应用前景,越来越引起人们的关注。而引发体系的选择对接枝效果和接枝聚合产品的性能至关重要。从引发机理,引发效果等各个方面出发,对近年来不同引发剂引发的各种烯类单体与酪素的接枝共聚反应进行了总结和评述,并对酪素接枝反应引发剂的发展趋势作了展望。     

硬脂酸乙酯的合成研究

本文以硬脂酸和无水乙醇为原料、浓流酸为催化剂,进行硬脂酸乙酯的合成研究。采用正交实验考察了醇酸的量比、反应时间及反应温度对合成硬脂酸乙酯的影响,实验结果表明:醇酸的量比为12．7、反应时间为6h及反应温度为80℃是最佳反应条件。     

硬脂酸单分子膜诱导电沉积Ag薄膜

以硬脂酸单分子膜为模板 ,通过电沉积方法在硝酸银溶液中诱导生成银膜。在不同工艺条件下 (液相浓度、单分子膜表面压以及沉积电位 ) ,获得了不同结构的 Ag膜。利用扫描电镜 SEM观察了银膜表面形貌。     

无溶剂合成硬脂酸月桂醇酯的研究

在无溶剂存在、微波辐射协助下,以对甲苯磺酸(PTSA)为催化剂,4A分子筛作脱水剂,以月桂醇和硬脂酸为原料快速合成了硬脂酸月桂醇酯.讨论了醇酸物质的量比、微波功率、辐射时间和催化剂用量对反应的影响.经正交实验得出合成最佳条件为:醇酸摩尔比1∶1.1、PrSA占原料总质量的1.5%、微波功率270±10 W、辐射时间20 min,产率可达95%.     

工业硬脂酸生产方案对比

硬脂酸是油脂化工行业中常见的一种工业原料,工业硬脂酸生产一般采用与氢气发生加成反应得到。工业上可采用油脂加氢生产硬脂酸,也可以采用脂肪酸加氢生产硬脂酸,不同的工艺路线适用于不同的生产企业。选择加氢方案时,应从多方面多角度进行比选,从而能够选择更符合自身要求、市场需求的工业硬脂酸生产方案。     

Precipitation of Hydroxyapatite under Stearic Acid Monolayers

The nucleation and growth of hydroxyapatite (HAp) crystals from solutions with and without Langmuir monolayers of stearic acid (SA) were investigated. The monolayers apparently enhanced the nucleation of HAp. Monolithic, filmlike polycrystalline HAp with preferred orientation of (00l) planes parallel to the monolayer interface was precipitated, while colloidal and powdery precipitation in the bulk solution was predominant in the absence of the monolayer. Geometrical similarity was found between the hexagonal packing conformation of the SA headgroups in the monolayers and the alignment of calcium ions in the (001) plane of HAp. It was suggested that HAp crystals nucleated and grew epitaxially on the monolayer interface.     

柠檬酸硬脂酸季戊四醇三元共聚蜡状物的研制

以柠檬酸、季戊四醇、硬脂酸为原料,采用直接酯化的两步反应合成了柠檬酸硬脂酸季戊四醇酯蜡,并对反应条件进行了优化。固定季戊四醇为0.1 mol的最佳条件为：第一步反应温度为200℃,时间1 h,硬脂酸用量28 g,催化剂为总质量的0.4%;第二步柠檬酸用量为10 g,反应温度150℃,反应时间3 h。最终产物为蜡状物质,酸值为2.2 mgKOH/g,针入度为0.1 mm,滴熔点为70℃。     

无溶剂法合成二甘醇葡萄糖苷硬脂酸酯

在无溶剂条件下 ,以硬脂酸钠作为催化剂 ,利用二甘醇葡萄糖苷与硬脂酸直接酯化合成二甘醇葡萄糖苷硬脂酸酯 ,在反应温度为 180℃ ,反应时间 10h ,催化剂用量为反应物总质量11 1%的条件下 ,硬脂酸的转化率达 95 0 %     

硬脂酸单乙醇酰胺的二步法合成研究

以硬脂酸与乙醇胺为原料 ,采用二步法合成硬脂酸单乙醇酰胺的反应优化条件是 :硬脂酸与乙醇胺的总的物质的量比为 1∶1 1 ;第一步反应中 ,硬脂酸与乙醇胺的物质的量比控制在 1∶0 7,温度为 1 70℃ ,反应 4h ;第二步反应中 ,加入剩余的乙醇胺 ,温度为 1 0 0℃ ,催化剂KOH用量为 0 0 76mol mol硬脂酸 ,反应 4h。硬脂酸单乙醇酰胺的产率可达到 86 9% ,终产物的熔点为 88～ 90℃。     

硬脂酸对碳酸钙表面改性的研究

采用硬脂酸对碳酸钙进行表面改性,研究了改性剂用量、改性温度和改性时间对改性效果的影响。测定了改性前后碳酸钙沉降体积、吸油值、活化度和黏度,并用红外光谱进行表征。实验结果表明硬脂酸可以改性碳酸钙,其改性较佳条件:硬脂酸用量为2.5%,改性温度85℃,改性时间50min。     

Effects of Stearic Acid on the Injection Molding of Alumina

This research investigated the influence of stearic acid on the injection molding of alumina, by varying the concentration of stearic acid. The interaction between stearic acid and alumina was identified using transmission infrared spectroscopy, indicating stearic acid preferentially adsorbed onto the alumina powder surface. In addition to slightly modifying the intrinsic binder viscosity, stearic acid adsorbed onto the powder surface changed the flow behavior of the mixtures from dilatant flow to pseudoplastic flow at low temperatures. As a result, inhomogeneous distribution of binder in the injection-molded parts was minimized with increased stearic acid concentration. However, the possibility of forming bubbles in the mixtures arising from vaporization of stearic acid was enhanced. Additionally, the binder burnout temperature range was broadened with the increase of stearic acid concentration.     

硬脂酸对轻质碳酸镁改性的研究

利用硬脂酸对轻质碳酸镁进行改性,研究了硬脂酸的用量、反应温度、反应时间对改性效果的影响,最终确定了最佳的改性条件。测定了改性轻质碳酸镁的沉降体积、吸油值和活化度并用红外光谱和热失重进行表征。实验结果表明轻质碳酸镁经改性后,亲水表面变为亲油表面;硬脂酸与轻质碳酸镁之间并不是简单的物理吸附,而是发生了化学反应,形成了新的化学键。     

Radiation-induced Grafting of Acrylic Acid and Vinyl Acetate Monomers onto Heavy-duty Poly(ethylene–vinyl acetate) Films

The preparation of graft films was carried out by direct radiation-induced graft polymerization of acrylic acid and vinyl acetate comonomer onto heavy-duty poly(ethylene–vinyl acetate) films. The effect of various comonomer compositions on the degree of grafting was investigated. The characterization and some selected properties of the graft copolymers prepared were studied. Thermal stability, mechanical and electrical properties of the films showed great promise for some practical applications. © of SCI.     

蔗糖硬脂酸酯的合成反应机理及动力学

在前期确立的合成反应较佳工艺条件下，研究了蔗糖与硬脂酸乙酯的反应机理，提出了蔗糖与硬脂酸乙酯反应过程的溶解－反应动力学模型，建立了该模型的动力学方程，并求取了模型参数，经检验证实，该模型可信度较高。     

降解淀粉与乙烯基类单体接枝聚合物的合成及应用

适当降解的玉米淀粉与乙烯基类单体在引发剂作用下通过接枝聚合得到了改性淀粉鞣剂。当体系中w (降解淀粉 ) =10 %、w (乙烯基类单体 ) =2 0 %、引发剂质量为反应物质量的2 .0 %、反应温度为 5 0℃、反应时间为 1 5h时所得聚合物的接枝百分率为 87%、接枝效率为94%及接枝频率为 43。用其预鞣时可减少铬鞣剂用量 30 %～ 5 0 % ,铬鞣废液中铬含量降低到 ρ(Cr2 O3) =0 .2 6g/L ,用其复鞣时所得成革的选择填充性显著。成品革丰满柔软 ,粒面细腻。