三烯丙基异氰脲酸酯熔融改性聚丙烯研究

在复合引发剂过氧化二异丙苯(DCP)/过氧化二苯甲酰(BPO)的引发下,采用多官能团单体三烯丙基异氰脲酸酯(TAIC)对聚丙烯(PP)进行熔融接枝改性。采用傅里叶变换红外光谱仪(FTIR)、差示扫描量热仪(DSC)对产物的结构和热性能进行了表征,并测定了产物的凝胶率。结果表明,TAIC的加入使改性PP的凝胶率增大,熔体流动速率减小,当TAIC为5份时,凝胶率达到最大值30.83%,而熔体流动速率达到最小值1.09g/10min。与纯PP相比,PP-g-TAIC的结晶温度和熔融温度都得到一定程度的提高。     

精品级交联剂三烯丙基异氰脲酸酯的制备

研究了物料配比、温度、时间、稳定剂用量等条件对制备精品级交联剂三烯丙基异氰脲酸酸TAIC的影响。优化的制备条件为：复合稳定剂Z-02添加剂：5‰～8‰；真空蒸馏时压力小于2．67kPa；浴液温度210～230℃：液相初馏温度135～155℃，气相初馏温度：125～145℃。产品TAIC纯度≥99．0％，收率≥92．0％。     

三烯丙基异氰脲酸酯对EVA/LDPE复合材料性能的影响

利用双螺杆挤出机,以乙烯-醋酸乙烯酯共聚物/低密度聚乙烯(EVA/LDPE)为基体,2,5-二甲基-2,5-双(叔丁基过氧基)己烷为引发剂,三烯丙基异氰脲酸酯(TAIC)为交联剂,制备了交联改性的EVA/LDPE复合材料。并通过凝胶含量分析、力学分析、差示扫描分析、动态力学分析以及介电性能测试等,研究了不同添加量的TAIC对该复合材料性能的影响。结果表明:随着TAIC添加量的增加,复合材料的凝胶含量显著提高,可达70%以上;复合材料的拉伸强度则呈现先增大后减小的变化趋势,其中当TAIC添加量为2%时,复合材料的拉伸强度可由添加前的11.64 MPa提高到16.48 MPa。此外,随着TAIC添加量的增加,复合材料的熔点、结晶温度和储能模量下降,玻璃化转变温度、维卡软化温度、黏度升高,介电常数亦呈下降趋势,但介质损耗的变化不大。     

甲基丙烯酸甲酯-异氰脲酸三烯丙基酯自由基交联共聚规律

对甲基丙烯酸甲酯-异氰脲酸三烯丙基酯（MMA—TAIC）本体自由基交联共聚动力学、溶胶和凝胶生成率和溶胶相对分子质量的变化规律进行了研究。发现TAIC加入对聚合转化率-时间关系影响不显著．聚合动力学可通过聚合温度和引发剂含量进行调节：MMA—TAIC交联共聚过程中凝胶点出现较晚（转化率50％～60％），凝胶点后凝胶分数先随转化率增加快速增加，溶胶相对分子质量快速降低，当转化率较高（如〉90％）时，凝胶分率和溶胶相对分子质量变化趋缓；聚合温度和引发剂含量对凝胶分率-转化率和溶胶相对分子质量-转化率关系的影响相对较小。     

甲基丙烯酸甲酯一异氰脲酸三烯丙基酯自由基交联共聚规律

时甲基丙烯酸甲酯-异氰脲酸三烯丙基酯(MMA-TAIC)本体自由基交联共聚动力学、溶胶和凝胶生成率和溶胶相对分子质量的变化规律进行了研究.发现TAIC加入对聚合转化率一时间关系影响不显著.聚合动力学可通过聚合温度和引发剂含量进行调节;MMA-TAIC交联共聚过程中凝胶点出现较晚(转化率50%～60%),凝胶点后凝胶分数先随转化率增加快速增加,溶胶相对分子质量快速降低,当转化丰较高(如＞90%)时,凝胶分率和溶胶相对分子质量变化趋缓;聚合温度和引发剂含量对凝胶分率-转化率和溶胶相对分子质量-转化率关系的影响相对较小.     

溶剂法合成三烯丙基异氰脲酸酯新工艺

研究了物料配比、溶剂种类、温度、时间、稳定剂和相转移催化剂等因素对溶剂法合成三烯丙基异氰脲酸酯的影响,最终得到了较佳的反应条件。     

马来酸酐-三烯丙基异氰脲酸酯官能化改性三元乙丙橡胶的反应过程

采用马来酸酐(MAH)和三烯丙基异氰脲酸酯(TAIC)对三元乙丙橡胶(EPDM)进行熔融接枝改性,考察了单体用量及反应温度等对接枝反应规律的影响。结果表明,采用过氧化二异丙苯(DCP)作引发剂,TAIC先与EPDM大分子自由基进行接枝反应形成接枝自由基,然后再与TAIC或MAH进行共接枝反应,TAIC能显著提高MAH的接枝率(R_g)。当TAIC为0.8份、MAH为5份、DCP为0.15份、反应温度为180℃时,MAH的R_g达到最大值,接枝共聚物的凝胶含量较低。     

热硫化硅橡胶并用硫化体系的研究

在硅橡胶制品的研制中，采用了加成硫化和过氧化物化并用的新的硫化方式。比较了并用硫化方式在热空气和模压硫化的性能及特点。并用硫化体系可以改善硅橡胶硫化胶的某些性能，保持在二段硫化后不变色或少变色。介绍了显影用硅橡胶管生产的应用实例，在热硫化硅橡胶制品的研制和生产中具有一定的实用意义。     

不同硫化体系对天然橡胶的动静态性能的影响研究

分别制备了以炭黑和白炭黑为补强填料的不同硫化体系天然橡胶(NR)复合材料,研究硫化体系对NR胶料静态和动态性能的影响。结果表明:普通硫化体系硫化胶具有较高的交联密度、较好的物理性能和优异的耐磨性能;对于白炭黑补强体系,普通硫化体系硫化胶具有最低的滚动阻力;而对于炭黑补强体系,平衡硫化体系硫化胶具有最低的滚动阻力;胶料拉伸强度的增大有利于耐磨性的提高。     

异氰脲酸酯基团对聚氨酯弹性体性能影响研究

引入异氰脲酸酯基团可提高聚氨酯弹性体的耐热性能,但同时对其他性能有一定影响。通过改变NCO含量考察异氰脲酸酯基团对聚氨酯弹性体的力学性能及耐溶剂性能的影响。力学性能测试结果表明,其硬度、拉伸强度和撕裂强度均在NCO质量分数为8％时达到极大值,分别为邵A60、10．33MPa和48．84kN／m,扯断伸长率随NCO含量增加单调减小,100％定伸强度单侧增大;耐溶剂实验表明,聚氨酯弹性体在NCO质最分数为8％时耐溶剂性能最好。     

5-[(4-氨基苯基)二氮烯基]嘧啶-2,4,6(1H,3H,5H)-三酮的合成

以对硝基苯胺和巴比妥酸为原料,通过重氮化及偶合反应合成了5-[(4-硝基苯基)二氮烯基]嘧啶-2,4,6(1H,3H,5H)-三酮(A),化合物A经硫化物还原,得到单偶氮化合物5-[(4-氨基苯基)二氮烯基]嘧啶-2,4,6(1H,3H,5H)-三酮(B),该化合物可作为重氮组分与一些具有活泼氢的偶合组分反应,从而制备出酰胺键多、对称性高及稳定性强的双偶氮化合物。考察了还原剂用量、反应时间及反应温度对化合物B收率的影响,结果表明:投料比n(A)∶n(Na2S)=1∶1.7,105℃下回流48h,化合物B的收率为84.6%。利用1H NMR、FT-IR及元素分析对产物的结构进行了表征。     

Structural analysis of 5-[thiazol-2-yldiazenyl]pyrimidine-2,4,6(1H,3H,5H)-trione in both solid state and solution

The synthesis, crystal structure analysis and characterisation of 5-[thiazol-2-yldiazenyl]pyrimidine-2,4,6(1 H ,3 H ,5 H )-trione are reported. This dye was characterised by ultraviolet–visible, Fourier Transform–infrared, proton nuclear magnetic resonance spectroscopy, mass spectrometry techniques and elemental analysis. Both the effects of pH value and solvent polarity upon the absorption properties of the dye have been presented. In addition, the structure of the dye has been determined by a single crystal X-ray diffraction method. The dye was triclinic in P-1 with a  = 8.2419(2) Å, b  = 10.6225(3) Å, c  = 12.5106(3) Å, α = 90.543(1)°, β = 102.79(3)°, γ = 103.858(1)°, V  = 1035.26(5) Å³, D _calc = 1.634 g/cm³ and Z  = 2. The asymmetric unit contains two crystallographically independent C₇H₅N₅O₃S molecules, alongside one half of the solvent C₂H₆O₂ molecule. In the crystal structure, intramolecular N–H…N and intermolecular N–H…N, N–H…O, O–H…N, C–H…O and C–H…N hydrogen bonds link the molecules to form a supramolecular network in which they seem to be effective in the stabilisation of the structure.     

Hypolipidemic activity of 6-alkoxycarbonyl-3-aryl-1,3,5-triazabicyclo[3.1.0]hexane-2,4-diones and 2-alkoxycarbonyl-5-aryl-1,3,5-triazine-4,6(1H,5H)-diones in rodents

Significant hypolipidemic activity was demonstrated by 6-ethoxycarbonyl-3-phenyl-1,3,5-triazabicyclo[3.1.0]hexane-2,4-dione, 2-ethoxycarbonyl-5-phenyl-1,3,5-triazine-4,6(1H,5H)-dione and 2-ethoxycarbonyl-5-(4-chlorophenyl)-1,3,5-trizine-4,6(1H,5H)-dione in rodents at 20 mg/kg/day. These agents lowered serum cholesterol and triglyceride levels by approximately 40% in mice after 16 d. Tissue lipids in rat liver, small intestinal mucosa, aortic wall and feces were reduced by treatment with the agents. Very low density lipoprotein (VLDL) and low density lipoprotein (LDL) cholesterol levels were reduced in the rat; high density lipoprotein (HDL) cholesterol levels were elevated after 14 d of treatment. The activities of regulatory enzymes,e.g., acetyl-CoA synthetase, acyl-CoA:cholesterol acyltransferase, cholesterol 7α-hydroxylase,sn-glycerol-3-phosphate acyltransferase, phosphatidylate phosphohydrolase and heparin-induced lipoprotein lipase, involved inde novo synthesis of hepatic lipids were affected by the agents. The new compounds may represent another class of potentially useful hypolipidemic agents for the treatment of atherosclerosis since HDL cholesterol levels were increased and VLDL and LDL cholesterol levels were lowered by some of the agents.     

Zn(MMA)_2对硫黄硫化天然橡胶性能的影响

甲基丙烯酸锌(Zn(MMA)_2)在自由基存在下可以与橡胶发生接枝和交联反应,在橡胶中引入金属离子键交联结构,发生自聚合反应生成纳米聚盐粒子等,使得硫化橡胶具有多元的交联网络结构和多元的填充网络结构,这使得硫化胶的物理力学性能大大提高。为了获得Zn(MMA)_2所给出的优异性能,需采用过氧化物硫化体系,虽然过氧化物与硫黄并用的体系有很多报道,但是都没有单纯采用过氧化物硫化时的性能好。由于硫黄硫化是不饱和橡胶最广泛采用的硫化体系,因此在硫黄硫化条件下,获得Zn(MMA)_2的优异性能,无疑是非常有意义的。从化学计量角度设计了胶料中硫黄的摩尔用量远远大于Zn(MMA)_2的摩尔用量(14:1/mol:mol)的情况,对比了三种硫化体系(S、Zn(MMA)_2/S、Zn(MMA)_2/S*)硫化天然橡胶的特点。结果表明Zn(MMA)_2/S体系硫化胶料的物理力学性能显著提高,这使在硫黄硫化体系中实现Zn(MMA)_2的优异性能成为可能。论文分析阐述了产生这些结果的原因并提出了可能的机理     

5-(3,4,5-三-十二烷氧基苯乙烯基)-2,4,6-(1H,3H)-嘧啶三酮的合成

以没食子酸甲酯为原料,与1-溴代十二烷醚化生成3,4,5-三-(十二烷氧基)苯甲酸甲酯,然后采用原位生成的硼氢化锂还原成3,4,5-三-(十二烷氧基)苯甲醇,再用氯铬酸吡啶盐(PCC)氧化成3,4,5-三-(十二烷氧基)苯甲醛,最后与巴比妥酸进行Knoevenagel缩合反应得到了标题化合物.该合成路线简单,原料价廉,操作简便,产率高,易于常量合成.     

Synthesis and characterization of strontium 1,3,5-benzenetricarboxylate, [Sr3(1,3,5-BTC)2(H2O)4]·H2O

A three-dimensional strontium-based metal-organic framework was constructed using 1,3,5-benzenetricarboxylic acid, [Sr₃((OOC)₃C₆H₃)₂(H₂O)₄]·H₂O. This new compound was synthesized hydrothermally and is a rare example of a strontium metal-organic network. The compound network contains three distinct Sr centers, one of which is seven-coordinate and the other two are nine-coordinate geometry. The benzene rings form a herring-bone type of arrangement down the a-axis. The material is thermally stable to ca. 230 °C and transforms to an unknown material before finally decomposing to phase-pure SrCO₃ at 650 °C. The synthesis, structure, morphology and materials properties are discussed.     

Properties of Polypropylene (PP)/Ethylene-Propylene Diene Terpolymer (EPDM)/Natural Rubber (NR) Vulcanized Blends: The Effect of N,N-m-Phenylenebismaleimide (HVA-2) Addition

This paper discusses process development, tensile properties, morphology, oil resistance, gel content, and thermal properties of polypropylene (PP)/ethylene-propylene diene terpolymer (EPDM)/natural rubber (NR) vulcanized blends with the addition of N,N-m-phenylenebismaleimide (HVA-2) as a compatibilizer. Blends were prepared in several blend ratios in a Haake Polydrive with temperature and rotor speed of 180°C and 50 rpm, respectively. Results indicated that the combination of dicumyl peroxide (Dicup) with HVA-2 shows high torque development and stabilization torque as compared to the blend with Dicup vulcanization alone. In terms of tensile properties, the combination of Dicup with HVA-2 shows higher tensile strength, tensile modulus (M₁₀₀), elongation at break, oil resistance, and gel content in all blend ratios compared to similar vulcanized blends with Dicup without HVA-2 addition. Scanning electron microscope (SEM) micrographs of the blends support that the cross-linking and compatibilization occur during the process of the vulcanized blend containing HVA-2. In the case of crystallinity of the blends, the addition of HVA-2 in Dicup vulcanized blend revealed a tendency for the percentage of crystallinity (Xc) to decrease. The addition of HVA-2 in Dicup vulcanization also produced blends with good thermal stability dealing with the so-called coagent bridge formation.     

二苯并（2，3，2＇，3＇，bg）－1H，6H，1，4，6，9－四氮－5－钛螺环［4，4］－5，5－二氯化物

ｏ－苯二胺与四氯化钛反应合成聚合物的模型化合物钛杂咪唑啉。该化合物经元素分析、红外光谱、质谱测试。     

SiO2-SO3H异相催化一步合成9-芳基-3,4,6,7,9,10-六氢吖啶-1,8(2H,5H)-二酮

以硅胶磺酸(SiO2-SO3H)为催化剂,4-芳硫基芳醛、1,3-环己二酮及醋酸铵为原料,于乙醇中合成了标题化合物.该方法具有处理方便、反应时间短、产率高、催化剂价廉易得、可回收重复使用等优点.     

2－丁氧基－5－（1，1，3，3－四甲基丁基）－苯硫酸的合成

以４－（１，１，３，３－四甲基丁基）－苯酚２为原料，通过３步合成了２－丁氧基－５－（１，１，３，３－四甲基丁基）－苯硫酚１。４－（１，１，３，３－四甲丁基）－苯酚２是由苯酚与二聚异丁烯（Ｄｉｉｓｏｂｕｔｙｌｅｎｅ）在硫酸存在下反应制得。３个化合物的结构以１ＨＮＭＲ予以表征。