新型含环氧端基聚芳醚酮的合成及表征

以 4,4′ 二氟二苯酮和 4 (4 羟基苯基 ) 2 ,3 二氮杂萘 1 酮经亲核取代逐步聚合制得含二氮杂萘酮结构的聚芳醚酮低聚物 ,再与环氧氯丙烷反应制得了所需分子量的含环氧端基的聚芳醚酮 (E PPEK) .用FT IR和1H NMR表征了分子链结构 ,并测定了聚合物的玻璃化转变温度Tg 和溶解性 .     

含环氧端基酚酞聚芳醚酮E-PEK的合成及表征

由酚酞和4,4′-二氯二苯酮经亲核缩聚制得了一系列不同分子量的含—OK端基的聚醚酮低聚物,将其与环氧氯丙烷反应得到了分子量为1000～8000的含环氧端基聚芳醚酮(E-PEK)。用IR和~1H NMR表征了E-PEK的分子链结构,测定了T_g、溶解性和熔融粘度。研究了E-PEK/DDE体系的固化,固化后树脂的T_(g∞)=183～215℃,与低聚物的初始分子量有关。     

含活性端基聚芳醚砚的合成

本文总结了将乙炔基、乙烯基、丙烯基、氨基、马来酰亚胺基、氰酸酯基、环氧基等活性基团引入聚芳醚砜链端的方法。引用参考文献27篇。     

含甲巯咪唑杂环为端基的非环冠醚的合成

本文以甲巯咪唑杂环为新的端基,在相转移催化条件合成了五个开链冠醚,这些化合物均通过元素分析、UV、IR 、^1H和^13CNMR波谱鉴定.     

含活性端基聚芳醚砜的合成

本文总结了将乙炔基、乙烯基、丙烯基、氨基、马来欧亚胺基、氰酸酯基、环氧基等活性基团引入聚芳醚砜链端的方法。引用参考文献２７篇。     

含苯并三唑色酮及1,3,4-噁二唑啉类化合物的合成

研究了一种简便的合成2位含氮杂环色酮类化合物的方法。1H-苯并三唑与ClCH~2COOH反应制得1H-苯并三唑-1-乙酸(1),以此为原料合成了一系列2位含1H-苯并三唑-1-甲基色酮(5)和相关的1,3,4-噁二唑衍生物(8)。     

带内取向柔性多醚链苯炔大环合成

采用分子间Glaser半环闭环法合成了带内取向柔性多醚链的苯炔大环.用1H NMR,13C NMR,HRMS,UV及PL(photduminescence)确证了目标大环结构,凝胶色谱测定了目标大环纯度.经偏光显微镜(POM)和差热分析仪(DSC)测试表明大环没有呈现预期的液晶性质,可能是由于环内柔性链过于拥挤,不能形成与环平面共面结构,以至于难于进行有序堆积的缘故.     

聚芳醚酮大环化合物的核磁共振谱解析

利用一维ＮＭＲ方法研究了新型聚芳醚酮大环化合物的影响，用二维同核＾１Ｈ－＾１Ｈ ＣＯＳＹ和＾１３Ｃ－＾１Ｈ ＣＯＳＹ实验方法以及类似物质标准谱图的比较，对一维ＮＭＲ谱峰进行了归属。     

3′-甲酰基苯并冠醚的合成

4′位取代苯并冠醚已有很多报道,3′位取代苯并冠醚却很少见。见诸文献的3′位取代基仅有甲基、芳甲酰基、甲氧基、正十五烷基、氰基和叔丁基等。鉴于苯环     

含环氧端基酚酞聚芳醚腈的合成及表征

环氧树脂（ＥＲ）的冲击韧性和耐开裂性较差,因此,提高其抗冲强度而不显著影响力学性能和耐热性能是重要的研究课题．对于ＥＲ的增韧,以前主要采用液态橡胶．近年来,人们开始研究使用高性能热塑性树脂增韧ＥＲ［１～３］．聚醚腈（ＰＣＥ）是目前机械强度最高的热塑性...     

5-甲基-1,3,4-噻二唑-2-硫为端基的非环冠醚的合成

本文用2-巯基-5-甲基-1,3,4-噻二唑与二溴乙烷或低聚乙二醇溴化物合成了四种新的非环冠醚. 通过元素分析,UV,IR和^1H NMR波谱鉴定.     

Synthesis and magnetic resonance of new heteropolynuclear Ln(III)-Cu(II) complexes with noncyclic polyether Schiff base

Ｎｏｎｃｙｃｌｉｃｐｏｌｙｅｔｈｅｒｓｈａｖｅａｔｔｒａｃｔｅｄｍｏｒｅａｎｄｍｏｒｅａｔｔｅｎｔｉｏｎｆｏｒｔｈｅｉｒｎｏｎｅｘｐｅｎｓｉｖｅ,ｌｅｓｓｔｏｘｉｃｉｔｙａｎｄｓｏｏｎ.Ｔｈｅｙｈａｖｅｓｏｍｅｐｒｏｍｉｓｉｎｇａｐｐｌｉｃａｔｉｏｎｓｉｎｓｏｌｖｅｎｔｅｘｔｒａｃｔｉｏｎａｎｄｅｎｒｉｃｈｍｅｎｔｏｆｍｅｔａｌｉｏｎｓａｓｗｅｌｌａｓｉｎｔｈｅｉｏｎｓｅｌｅｃｔｉｖｅｅｌｅｃｔｒｏｄｅ,ｅｔｃ.[1].ＮｏｎｃｙｃｌｉｃｐｏｌｙｅｔｈｅｒＳｃｈｉｆｆｂａｓｅｉｓｏｎｅｏｆｐｏｌｙｄｅｎ…     

Rare earth complexes with noncyclic polyether-methionine Schiff base

A novel Schiff base (TAMET) was synthesized by the condensation of tetraglycol aldehyde with methionine and a mild oxidant CrO3· (C5H5N)2 was selected for the reaction. Seven new rare earth complexes with this Schiff base have been synthesized and characterized by elemental analysis, TG-DTA, molar conductivity, magnetic susceptibility and IR, especially 1H NMR spectra. Information was obtained from reflectance spectra and the coordination of sulfur atom to rare earths was discussed. The experimental results show that thesecompounds have some biological activity and could dispose of O2.     

Poly(ether imide)s with tailored end groups

Poly(ether imide) (PEI) from polycondensation of 2,2-bis[4-(3,4-dicarboxyphenoxy) phenyl] propane dianhydride (BPADA) and m-phenylenediamine (mPD) is a type of high-temperature engineering thermoplastics that have high glass transition temperature and outstanding mechanical properties. Owing to its wide use in many fields including automotive, aircraft, and electronics, the research of PEI has surged in the last few decades. As science and technology continue to progress rapidly, there is a growing demand for PEIs with better properties. Although a few approaches have successfully improved the properties of PEI, it is recognized that these approaches require complex procedures and are uneconomical. Contrastingly, end-group modification of PEI is highly effective, simple, and economical. Over the last few years, our group has extensively studied the methods for improving the properties of PEI through end-group modification. The end-group moieties and polymer blocks introduce multiple hydrogen bonding, electrostatics, and microphase separation to PEI. In this article, we first classify the end groups based on their characteristics. Then, we compare their effects on the properties of PEIs, including thermal, rheological, mechanical, optical, flame-retardant, and morphological, and discuss the roots of these effects. The in-depth comparisons and discussion generate principles to guide the synthesis of PEIs with tailored properties by modifying the end groups. This timely article will provide insights into the synthesis of other novel high-temperature polymers and entice endeavors to develop novel end groups.     

Synthesis of polyethers containing cyclodipeptide moiety in the main chain

The dichlorodihydropyrazines derived from 2,5‐diketopiperazine were treated with diols in a basic condition to afford polyethers containing cyclodipeptide moiety in the main chain, which were found to be degraded into amino acid components in an acidic condition. © 2001 John Wiley & Sons, Inc. J Polym Sci A: Polym Chem 39: 927–933, 2001     

Effect of end groups on complexation kinetics between cyclodextrins and guest polymers

α‐Cyclodextrin (α‐CD) has been complexed with various poly(ethylene glycol) (PEG) derivatives in aqueous solution. It has been found that the end groups of PEG derivatives affect the complexation kinetics greatly, but have only a little influence on the thermodynamic behavior. By increasing the hydrophobicity of end groups, the complexation speeds up rapidly. On the other hand, the bulky end groups slow down the threading of polymeric guests into the cavity of CD. By changing the hydrophobicity and the size of end groups, the complexation rate can be adjusted in the range of several orders of magnitudes, which should be quite useful in the design of new supramolecular systems. © 2006 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 44: 2050–2057, 2006     

The thermal degradation of polymethacrylonitrile with different end groups

Polymethacrylonitrile (PMAN) was prepared by bulk, solution and precipitation polymerization. The thermal stability of the polymer, which is affected by the structure of the chain end groups, was studied by non-isothermal thermogravimetry (TG). On the basis of the differential TG curves of samples prepared by polymerization in the presence of chlorinated solvents, it may be concluded that, in addition to end-chain and random main chain scission initiated depolymerization, hydrogen chloride evolution also occurs during the thermal degradation of PMAN.     

EPR character of gadolinium complexes with noncyclic polyether Schiff bases and its solvent effects

EPR characters of three new gadolinium complexes with noncydic polyether Schiff bases in powder or organic solvents, including various oxyethylene chain lengths and different substituting groups in ligands, are investigated respectively. Some regularities are summed up. The difference of EPR character in various solvents, particularly at different temperatures, has been examined. The 'single peak effect' due to THF solvent at low temperature is observed for the first time. This phenomenon is explicated.     

Synthesis and crosslinking of polyethers with nadimide derivative pendant groups

Polyethers with nadimide derivatives pendent groups have been prepared by ring-opening polymerization of nadimide glycidyl derivatives. The structure of the linear polymers has been confirmed by spectroscopic methods. Properties such glass transition temperatures and thermal resistance have been measured and related to their chemical structure. Crosslinking studies have been carried out by DSC and TGA. Kinetic parameters could be obtained by dynamic method. The crosslinking causes an increase in T_g of the system and it has been possible to relate this increase to the chemical structure of the network. © 1992 John Wiley & Sons, Inc.