苯并咪唑类没食子酸酯抗菌化合物的性质及应用

苯并咪唑类没食子酸酯(BG)是本实验室合成的、新的抗菌化合物。本文选择了其中已经XRD确定了结构的1-没食子酸乙酯-2-(对溴)苯氧甲基苯并咪唑(BG-Br)为代表进行研究。用BG-Br乳液和BG-Br二甲亚砜溶液分别处理蓝湿皮,采用抑菌圈法和振荡法测定处理皮样的抗菌效果;将BG-Br乳液和BG-Br溶液分别与皮粉作用,对处理皮粉进行DSC分析;观察BG-Br在明胶凝胶中的渗透情况。结果表明,BG-Br的最小抑菌浓度范围为8×10-5~4×10-4g/m L,处理的皮革有较好的抗菌效果;在明胶中的渗透性较好,但处理的铬皮粉的热稳定性会有所下降。总之,这种新的材料有可能在皮革工业上应用,以制备具有一定抗菌性能的皮革。     

国产芳纶上浆剂对聚三唑复合材料力学性能的影响

目的研究国产芳纶纤维DAF-III表面上浆剂的主要成分及其对复合材料界面性能的影响。方法用丙酮溶剂抽提纤维一定时间,分析对比去除上浆剂前后的纤维和抽提溶液,并制备DAF-III增强的聚三唑树脂复合材料,测试复合材料的力学性能。结果国产DAF-III芳纶纤维的主体结构是聚酰胺苯并咪唑,表面上浆剂主要组分是脂肪族酯类低聚物。溶剂抽提去除了纤维表面大部分上浆剂,裸露的纤维本体存在制备过程中形成的沿纤维方向的大量沟壑;去除上浆剂后,复合材料的ILSS和弯曲强度分别提高了181.2%和56.20%。结论纤维表面上浆剂对纤维以及纤维增强的复合材料力学性能影响显著,纤维与树脂通过机械锚合和氢键作用改善界面粘接。     

Chemical Synthesis and Characterization of Novel Antibacterial Polycyclic Polymer

Polyaniline (PAn) and poly(alkyl substituted anilines) were synthesized in aqueous media by chemical polymerization of alkyl substituted aniline in presence of ammonium peroxydisulphate as an oxidant. The products were investigated in terms of morphology, chemical structure, and mechanism of polymerization with scanning electron microscope (SEM), transmission electron microscopy (TEM), fourier transform infrared (FTIR), and UV–visible spectroscopy (UV–vis), respectively. Results indicated that physicochemical properties of poly(alkyl substituted anilines) depend on substituent groups bonded to N-position. In general, alkyl-substituted PAn have similar chemical and optical properties to parent PAn and it seems that the substituted PAn follow the same polymerization mechanism as reported for PAn. The prepared polymers were then tested for the antibacterial properties against Gram-negative bacteria: Escherichia coli (E. coli). The antibacterial properties were assessed by measuring the zones of inhibition. The antimicrobial results showed clearly that PAn and poly(alkyl substituted anilines) exhibited excellent antibacterial activity against the growth of E. coli microorganism.     

Synthesis and Mutagenic Activity of Bay-Region Bridged Chrysenes

The synthesis of a series of substituted bay-region bridged chrysene derivatives is described. The method involves the oxidative photocyclization of stilbene carboxylic acids followed by dehydration with hydrofluoric acid. The photocyclization of stilbene carboxylic acids lead to secondary photolactonizations and functionalization of a bay region carbon by a novel photolytic process. The mutagenic activity of the substituted chrysenes was determined and activity levels correlated with substituent effects.     

聚异丁烯丁二酰亚胺合成新工艺

采用络合Ｆ－Ｋ酸作引发剂进行异丁烯阳离子聚合。在过量马来酸酐存在的情况下，与异丁烯低聚物进行热反应，再在引发剂的作用下进行自由基共聚合。将得到的聚异丁烯丁二酸酐与多烯多胺反应得到活性物含量达９５％的最终产品。实验考察了浓度、温度和时间对各步反应影响，确定了最佳工艺条件。     

N—马来酰基——氨基丙酸丁酯的微乳液聚合研究

以马来酸酐（MA）、氨基丙酸（ALn）、丁醇为原料合成了N-马来酰基-D，L-氨基丙酸丁酯（BAM），配制了以十二烷基硫酸钠和正戊醇为复合乳化剂，含有BAM的微乳液。用过硫酸钾引发该体系进行微乳液聚合，考察了聚合温度对聚合的影响，并用PERKIN-ELMERFTIR-1710红外光谱仪、DSC、TG、元素分析仪对产品进行了检测。     

半干法制备高取代度阳离子淀粉

研究了半干法制备高取代度阳离子淀粉的各种影响因素,研究表明:最佳工艺条件是:醚化剂用量ω=55%;氢氧化钠用量ω=1.0%;体系含水量ω=26%;反应温度70℃;反应时间4h;加入适量催化剂Eω=10%,能制备出取代度0.510,反应效率达88.7%的高取代度阳离子淀粉.     

Direct observation of the stacked structure in substituted copper phthalocyanine LB films with STM

The in-plane molecular structures of octa-alkyl substituted copper phthalocyanine LB films deposited on graphite have been resolved with a scanning tunnelling microscope (STM). The face-to-face stacking of Pc macrocycles has been observed in the topographies of R₈PcCu monolayers. The stacking period was found to be 3.8–4 Å and the molecular rows were separated by 19 Å and 16 A for (C₆H₁₃)PcCu and (C₅H₁₁)PcCu respectively.     

N‐Bromosuccinimide‐Mediated Radical Cyclization of 3‐Arylallyl Azides: Synthesis of 3‐Substituted Quinolines

Visible light irradiation of N‐bromosuccinimide serves as an effective means to convert methyl 2‐(azidomethyl)‐3‐arylpropenoates and 2‐(azidomethyl)‐3‐arylacrylonitriles to the corresponding iminyl radicals via α‐hydrogen abstraction and subsequent extrusion of dinitrogen. Thus formed iminyl radicals then undergo intramolecular ortho attack on the aryl ring, affording methyl quinoline‐3‐carboxylates and quinoline‐3‐carbonitriles respectively.

     

Al替代和烧结温度对NiZn铁氧体磁性能的影响

采用陶瓷工艺制备了Al替代的Ni0.5Zn0.5AlxFe2-xO4(x=0~0.10)铁氧体材料,用XRD、B-H分析仪和阻抗分析仪对其结构和磁性能进行了研究。实验发现,最佳烧结温度为1 250℃,过高和过低的烧结温度不利于降低磁芯损耗。当Al3+替代量x=0.06时,铁氧体能获得较好综合磁性能。