高锰酸钾/硫脲引发魔芋粉-丙烯酰胺接技共聚合及产物增稠性研究

用高锰酸钾／硫脲为引发剂，引发魔芋粉(KGM)与丙烯酰胺(AM)的接枝共聚。研究了引发剂浓度、单体浓度、酸度、反应温度、反应时间、反应介质以及KGM预处理方式等对接枝反应的影响，同时还研究了产物的水溶性及增稠性，并探讨了接枝反应机理。     

增稠剂的反相乳液聚合及增稠性能研究

通过反相浮液聚合的方法合成一种印花增稠剂，并对它的应用性能进行了较为全面的测试，结果表明，合成的增稠剂有比较强的增稠性能，而且耐电解质性能明显优于同类产品KG－202。并用电子显微镜观察了在不同pH值时乳胶粒子的结构。     

Ce4＋－Ce3＋循环体系引发淀粉与丙烯酰胺接枝共聚合反应动力学研究

The cyclic initiating system of Ce⁴⁺ - Ce³⁺ - Ce⁴⁺, in which the product of reduced ion Ce³⁺ forming from Ce⁴⁺ after initation being oxidized again to the original oxidizing ion Ce⁴⁺ is examined. The characters of process of the graft copolymerisation using the cyclic initiating system is compared with the ones using ceric and persulphate individually. When using the cyclic systerm as initator, it was more effective to graft polymerise acylamide onto starch and a rather high proportion of graft copolymer was made as opposed to using persulphate individually.     

(丙烯酰胺-丙烯酸十六酯)共聚物的合成及其增稠性能研究

采用沉淀聚合法合成丙烯酰胺 -丙烯酸十六酯共聚物。重点讨论了合成条件如单体配比、引发剂用量、温度等对共聚反应的影响以及共聚物对苯丙乳胶的增稠性能的影响。并用DMTA和凯达尔定氮法表征了共聚物组成 ,结果表明 :所合成的共聚物可以作为疏水缔合型增稠剂使用     

铈离子引发N-对甲苯基丙烯酰胺类聚合物膜上丙烯酰胺接枝共聚合的研究

合成了NTAAM,NTMAAM,NPMAAM功能单体,发现这类功能单体与铈离子组成的体系能引发丙烯酰胺聚合,带有这类功能单体的聚合物和共聚物铸成的膜,能用铈离子引发丙烯酰胺接枝共聚合。这可从反应后的膜比基膜有较大的吸水率、与水有较小的接触角,也可从扫描电子显微镜观察到表面上有凸起图象的高分子链,以及从膜表面的X射线光电子能谱所证实。同时研究了共聚物膜的组成、反应条件对接枝共聚合的影响。     

聚(丙烯酰胺-丙烯酸十八酯)的合成及其增稠性能

共聚合;聚(丙烯酰胺-丙烯酸十八酯)的合成及其增稠性能     

疏水缔合型增稠剂聚(丙烯酰胺-丙烯酸高级酯)的合成及增稠性能研究

采用沉淀聚合法合成了聚（丙烯酰胺－丙烯酸十四酯），聚（丙烯酰胺－丙烯酸十六酯）和聚（丙烯酰胺－丙烯酸十八酯），重点讨论了共聚物中疏水基团数量及疏水基团链长对增稠性能的影响。采用凯达尔定氮法和动态热分析（DMTA）测定了共聚物的组成及玻璃化温度。     

铈盐－过硫酸盐复合引发淀粉与丙烯酰胺接枝共聚合产物研究

铈盐－过硫酸盐复合引发淀粉与丙烯酰胺接枝共聚合产物研究王玉芹，杨巍，崔丹（黑龙江商学院石油系哈尔滨１５００７６）（黑龙江大学化学系哈尔滨１５００８０）关键词Ｃｅ~（４＋）－ＳＯ_２Ｏ_８~（２－）复合引发，Ｃｅ~（４＋）－Ｃｅ~（３＋）循环引发，淀粉与丙烯...     

Ce~（4＋）－Ce~（3＋）循环体系引发淀粉与丙烯酰胺接枝共聚合反应动力学研究

Ｃｅ~（４＋）－Ｃｅ~（３＋）循环体系引发淀粉与丙烯酰胺接枝共聚合反应动力学研究张连生，王玉芹，杨巍（黑龙江大学化学系，哈尔滨，１５００８０）（黑龙江商学院商管系，哈尔滨，１５００７６）关键词Ｃｅ~（４＋）－Ｃｅ~（３＋）循环引发、Ｃｅ~（４＋）复合引发?..     

KMnO4引发魔芋粉-丙烯腈的接枝共聚反应

以KMnO4为引发剂进行魔芋粉与丙烯腈的接枝共聚反应。研究了魔芋粉预氧化时间、引发剂浓度、单体浓度、酸度、反应时间、反应温度和反应物加料方式等聚合条件对接枝效率的影响，并对接枝机理作了探讨。     

Graft Copolymerization of Methyl Methacrylate onto Chitosan Initiated by Potassium Ditelluratocuprate(III)

A novel redox system, potassium ditelluratocuprate(III) (DTC)–chitosan, was employed to initiate the graft copolymerization of methyl methacrylate (MMA) onto chitosan in alkali medium. The effects of reaction variables, such as the initiator concentration, ratio of monomer to chitosan, the pH value, as well as reaction temperature and time were investigated, and the grafting conditions were optimized. Graft copolymers with both high grafting efficiency (>90%) and percentage of grafting were obtained, and the rate of polymerization is higher, which indicated that the DTC–chitosan redox system is an efficient initiator for this graft copolymerization. The structures and the thermal property of chitosan and chitosan–g–PMMA were characterized by infrared spectroscopy (IR), X‐ray diffraction and thermogravimetric analysis (TGA). A mechanism is proposed to explain the generation of radicals and the initiation. The graft copolymer was used as the compatibilizer in blends of terpolyamide and chitosan. The scanning electron microscope (SEM) photographs indicated that the graft copolymer improved the compatibility of the blend.     

魔芋及其衍生物在医药卫生行业中的应用

对魔芋葡甘聚糖及其衍生物在医药卫生领域的应用进行了综述,讨论了近年来其在润肠通便、减肥、降糖、保肝护肝、调节血脂、抗肿瘤、药品缓释、多孔支架材料、止血剂方面的应用情况。     

Effect of Plasma Treatment on the Structures and Properties of Konjac Glucomannan Film

To understand the effect of plasma treatment on the Konjac glucomannan film, the nitrogen plasma was injected into the film by ion beam injection machine in this study. The structures and properties of Konjac glucomannan film after plasma treatment were analyzed by Infrared spectroscopy, Raman spectrum, X-ray, ect. The result showed that nitrogen groups appeared in the KGM molecular chain and part of this chain fractured, and the number of hydrogen bonds increased after the treatment of plasma. The form of KGM molecule remained amorphous non-crystalline state, but the crystalline region was increased and became more ordered. The mechanical property of tensile strength and breaking elongation was improved, while the WVP was decreased. The nitrogen groups were grafted on the KGM molecular chain after plasma treatment, which led to the improvement of the properties of KGM film.     

双醛葡甘聚糖溶液的荧光光谱特性研究

研究了双醛葡甘聚糖水溶液在不同紫外光激发下的荧光光谱特性。结果表明,在220～320 nm紫外光激发下,双醛葡甘聚糖分子环结构中C—O—C醚键单元的氧未共价成键电子吸收激发光子产生n→σ＊跃迁,醛基单元中C=O氧未共价成键电子吸收激发光子产生n→π＊跃迁,最大发射波长分别在425 nm和465 nm左右;溶剂通过氢键等相互作用对双醛葡甘聚糖溶液荧光光谱产生显著影响。研究结果对探索葡甘聚糖水凝胶给药载体与小分子药物的相互作用机理及其释药行为具有指导意义。     

Dynamics Study of the Influence of Temperature on Konjac Glucomannan Saline Solution＇s Viscosity

Molecular dynamics （MD） method is adopted to simulate the conformation variations of konjac glucomannan （KGM） saline solution at different temperatures, and structurally analyze the trends and reasons of viscosity change in KGM saline solution with temperature. The experimental results have been analyzed to find out that the sum of formative hydrogen bonds decreases with the rise of temperature and the amount of intramolecular hydrogen bonds suddenly increases at 323 K. Besides, in terms of molecular orbital data obtained from simulation, we can know that hydrogen bonding energy also decreases with the rise of temperature. Therefore, we can predict the viscosity of KGM saline solution decreases gradually when rising the temperature.     

Preparation and Properties of Chitosan/Konjac Glucomannan Blend Fibers

Chitosan and konjac glucomannan (KGM) blend fibers were prepared by spinning their solution through a viscose‐type spinneret into a coagulating bath containing aqueous sodium hydroxide and ethanol. The structure and properties of the blend fibers were studied with the aids of infrared spectra (IR), scanning electron micrography (SEM) and X‐ray diffraction (XRD). The structure analysis indicated that there were strong interaction and good miscibility between the chitosan and KGM molecule which resulted from intermolecular hydrogen bonds. Mechanical properties and water‐retention properties were measured. Through controlling blend conditions, blend fibers can obtain better mechanical properties than the pure chitosan fiber. The water‐retention values (WRV) of blend fibers increase as the amount of KGM is raised. The fibers treated with alcoholic solution of acetic acid have good antibacterial activity to Staphylococcus aureus.     

壳聚糖-丙烯酰胺接枝共聚及其絮凝性能

壳聚糖-丙烯酰胺接枝共聚及其絮凝性能;壳聚糖;丙烯酰胺;接枝共聚;絮凝     

高锰酸钾—硫脲体系引发丙烯酸接枝共聚尼龙的研究

研究了以高锰酸钾和硫脲组成的氧化还原引发体系,在水介质中,引发丙烯酸接枝共聚尼龙的共聚反应。考察了丙烯酸浓度、引发剂浓度及温度等因素对接枝共聚反应的影响。红外光谱分析和Ｘ射线衍射图谱证明了接枝反应的存在及对聚合物结晶度的影响。