1H NMR研究β-环糊精与环氧氯丙烷共聚物的反应机理和分子链结构

β-环糊精(cyclodcxtrin)与环氧氯丙烷(Epichlorohydrin)一个系列的共聚物获得,¹H NMR以D₂O或DMSO-d₆为溶剂的测定,其谱峰被归属.共聚合反应机理为以羟基和环氧基为活性中心的亲核取代.当环氧氯丙烷:β-环糊精=n ≤ 3时,聚合物分子链呈现以β-环糊精母体为中心的线状或低枝化状链结构;当n ≥ 5时,分子链出现交联网络结构.n越大(n ≤ 12),分子量越急剧增加,其交联度也越大.     

β-环糊精与环氧氯丙烷共聚物的13C-NMR研究

¹³C NMR测定了一个系列的环氧氧丙烷与β-环糊精的共聚物,进行了谱峰归属和DEPT谱验证,实验测得2,3-丙二醇基在β-环糊精C(2)-O-位、C(3)-O-位和C(6)-O-位取代的¹³C NMR化学位移α-取代效应参数,描述了该共聚物分子链的组成和链化学结构特征.     

X-荧光光谱法在测定有机物或高分子中金属及若干种非金属元素含量中的应用

本文讨论了用X-荧光光谱法测定高分子络合物中稀土金属元素的含量,有机物中的磷含量及合硅交联树脂中的硅含量。本法具有简便,用量少,又可减少化学法污染环境等优点。这是将X-荧光光谱法扩大用于有机物及高分子成分分析领域的新方法。     

~1H NMR研究β—环糊精与环氧氯丙烷共聚物的反应机理和分子链结构

β-环糊精(cyclodcxtrin)与环氧氯丙烷(Epichlorohydrin)一个系列的共聚物获得,~1HNMR以D_2O或DMSO-d_6为溶剂的测定,其谱峰被归属.共聚合反应机理为以羟基和环氧基为活性中心的亲核取代.当环氧氯丙烷:β-环糊精=n≤3时,聚合物分子链呈现以β-环糊精母体为中心的线状或低枝化状链结构;当n≥5时,分子链出现交联网络结构.n越大(n≤12),分子量越急剧增加,其交联度也越大.     

STUDIES ON THE POLYMERIZATION OF β-CYCLODEXTRIN WITH EPICHLOROHYDRIN*

Different proportions of β-cydodextrin and epichlorohydrin were used to prepare a group of β-cyclodextrin polymers. The relationship between the reaction extent and the molar ratios of reactants was discussed according to the results of ~1H-NMR, ~(13) C-NMR spectra and elemental analysis. Especially, high resolution ~1H-NMR spectra were usd for studying the reaction active sites and the extent of reaction. The solubility of oil soluble drugs in water was largely improved in the presence of water-soluble β-cyclodextrin polymer.     

有机及高分子化合物中镧、磷、硅的XRF法测定

X-荧光光谱法(XRF法)用于测定稀土无机化合物已有许多应用,但在测定有机及高分子化合物中金属元素、磷、卤素、硅含量方面的应用尚未见到过报道。一般用化学法测定,需先除去或破坏有机物(或高分子)后才能测定,手续繁多。对交联聚合物因不能溶解更难以测定。我们用XRF法测定了高分子金属配合物中稀土元素的含量,含硅交联树脂中硅的含量以及有机物中磷的含量。简要方法如下:测定可溶性样品时用与薄样法类似的点滴滤纸法,分别以稀土硝酸盐、氯化钠、磷酸二氢钾为标准样品,测定稀土、氯、磷含量     

THE SYNTHESIS AND CHARACTERIZATION OF Ba-CROSSLINKED POLYMER ANTI-RADIATION MATERIALS

Crosslinked poly(methyl methacrylate) and polystyrene with barium dimethacrylate [Ba(MA)_2] as crosslinking agent have been synthesized. The relationship between X-ray absorbability and the content of Ba(MA)_2 in polymers was investigated. TGA and DSC results indicated that the crosslinked polymers containing barium dimethacrylate have a much better heat stability than pure PMMA or PS. The mechanical properties of the polymers containing barium are improved in comparison with the pure PMMA.