搜索结果: 16-30 共查到“知识库 高分子合成化学”相关记录95条 . 查询时间(2.452 秒)
对炔丙氧基苯基噁唑啉的合成及改性苯并噁嗪树脂的研究
噁唑啉 苯并噁嗪 固化机理 热性能
2014/3/15
通过四步法合成了对炔丙氧基苯基噁唑啉（p-propynyloxyphenyl-2-oxazoline 简称POPO），采用核磁共振氢谱（1H-NMR）、傅立叶红外光谱（FTIR）、气相色谱质谱联用仪（GC-MS）和元素分析证实了其分子结构，以示差扫描量热仪（DSC）和热重分析（TGA）揭示了其固化行为和热分解性质，该化合物熔点为120 ℃，起始固化温度为200 ℃，固化峰值温度为280 ℃，自固化...
利用4-辛氧基联苯酚-3,5-二氨基苯甲酸酯(C8)、3,3'-二甲基-4,4'-亚甲基二苯胺(DMMDA)以不同比例与4,4-氧双邻苯二甲酸酐(ODPA)一步法聚合制得第一体系不同二胺含量的聚酰亚胺(PI)。研究了二胺含量对PI的溶解性、取向性、预倾角和热稳定性的影响。用C8、DMMDA以相同比例与ODPA、均苯四甲酸酐(PMDA)、3,3',4,4'-二苯甲酮四羧酸二酐(BTDA)一步法反应,...
E)--2--acetyl--4--(4--methoxyphenyldiazenyl) phenol: X--ray and DFT--calculated structure
Diazeny X-ray IR DFT
2011/4/6
The crystal structure of the title compound, (E)-2-acetyl-4-(4-methoxyphenyldiazenyl) phenol, displays a trans configuration of the azo moiety as found for other azo (diazene) derivatives. The aromati...
Synthesis and in vitro antimycobacterial activities of novel 6-substituted-3(2H)-pyridazinone-2-acetyl-2-(substituted/ nonsubstituted acetophenone) hydrazone
3(2H)-Pyridazinone acetophenone hydrazone antimycobacterial activity antitubercular drugs
2011/4/6
The difficulty in managing tuberculosis includes the prolonged duration of the treatment, the emergence of drug resistance, and coinfection with HIV/AIDS. Tuberculosis control requires new drugs that ...
Molecular modeling and antimycobacterial studies of Mannich bases: 5-hydroxy-2-methyl-4H-pyran-4-ones
Antimycobacterial activity DNA gyrase activity hydroxy-4H-pyran-4-one homology modeling
2011/4/6
The World Health Organization lists tuberculosis among the top 3 leading causes of death from a single infectious agent, and reported cases of multidrug-resistant tuberculosis (MDR-TB) are on the rise...
Synthesis and anti-Helicobacter pylori activity of (4-nitro-1-imidazolylmethyl)-1,2,4-triazoles, 1,3,4-thiadiazoles, and 1,3,4-oxadiazoles
4-Nitroimidazole 1,2,4-triazoles 1,3,4-thiadiazoles 1,3,4-oxadiazoles anti-H. pylori activity
2011/4/6
A series of [(4-nitro-1H-imidazol-1-yl)methyl]-1,2,4- triazoles and 1,3,4-thiadiazoles were prepared and evaluated for their activity against sensitive and resistant H. pylori strains. Study of the st...
Synthesis and spectrophotometric determination of acidity constants of 2,3,4,6'-tetrahydroxy-3'-sulfoazobenzene and their use in determination of aluminum
Azo dye acidity constants aluminum spectrophotometric determination
2011/4/6
A novel azo derivative, 2,3,4,6'-tetrahydroxy-3'-sulfoazobenzene (THSA), was synthesized by using pyrogallol. The acid dissociation constants, or Ka values, of THSA were determined by the UV-visible s...
Synthesis and properties of new optically active and organosoluble poly(ester-imide)s containing L-valine moieties in the main chain by direct polycondensation reaction
Poly(ester-imide)s direct polycondensation optically active polymers thermal properties
2011/4/6
New optically active poly(ester-imide)s (PEIs) containing bicyclo[2,2,2]oct-7-ene-2,3,5,6-tetracarboxylic diimide in the main chain were prepared by the reaction of N,N'-(bicyclo[2,2,2]oct-7- ene-2,3,...
Synthesis, crystal structure, and antioxidant properties of novel 1,2,4-triazol-5-ones containing 3,4-dimethoxyphenyl and 3,4-dihydroxyphenyl moiety
Synthesis 1,2,4-triazole-3-one antioxidant activity X-ray
2011/4/6
A series of new 4-(3,4-dimethoxyphenethyl)-5-akyl/aryl-2H- 1,2,4-triazol-3(4H)-ones (3a-g) was obtained by the reaction of ethyl 2-(ethoxy)(alkylidene/arylidene)hydrazinecarboxylate (1) and 2-(3,4-dim...
Determination of stability constants of 5-(2-hydroxybenzylidene)-2-thioxodihydropyrimidine-4,6(1H,5H)-dione with copper(II) and mercury(II) ions
Cu(II) and Hg(II) complexes 5-(2-hydroxybenzylidene)-2-thioxodihydropyrimidine-4,6(1H,5H)-dione spectrophotometry
2011/4/6
In this work, a hard model chemometric method was used to determine the stability constants of copper(II) and mercury(II) complexes with the newly synthesized ligand 5-(2-hydroxybenzylidene)- 2-thioxo...
Synthesis and spectral characterization of a decavanadate/chitosan complex
Chitosan biomaterials vanadium compounds crosslinking
2011/4/6
A decavanadate/chitosan complex was synthesized by crosslinking chitosan with decavanadate anions at a pH of 3. The materials were characterized by Fourier transformed infrared spectroscopy (FT-IR), X...
Synthesis and characterization of novel benzovesamicol analogs
Benzovesamicol ethylenedicysteine vesicular acetylcholine transporter
2011/4/6
Three new racemic vesamicol analogs were successfully prepared in good yields and high purity. All compounds were characterized by both IR and NMR spectroscopy. Compounds (\pm)-5 and (\pm)-6 showed a ...
丝素蛋白/聚D,L-乳酸共聚物的研究
D,L-丙交酯 丝素蛋白 聚乳酸 开环共聚
2012/8/3
以D,L-丙交酯和蚕丝丝素蛋白(SF)为原料,在氯化亚锡/对甲苯磺酸体系的催化作用下聚合得到丝素蛋白改性聚D,L-乳酸的共聚物(PSFLA)。该共聚物的结构与性能采用红外光谱法、1HNMR、热重分析、差示扫描量热法、粘度法、旋光度法和扫描电镜等方法进行研究。所得的PSFLA均不具有光学活性,但原料配比对共聚物的微结构与结晶性能有重要的影响。当D,L-丙交酯与丝素蛋白的质量比为6:1时,共聚物中可能...
冰片烯-二氧化硫聚砜树脂的合成及表征
冰片烯 二氧化硫 自由基聚合 聚砜树脂
2012/8/3
以α-蒎烯为原料合成冰片烯。以冰片烯(BE)、二氧化硫(SO2)为单体,采用自由基聚合方法合成了冰片烯-二氧化硫聚砜树脂(BE-SO2),用同样的方法分别以冰片烯(BE)、二氧化硫(SO2)、马来酸酐为单体和以冰片烯(BE)、二氧化硫(SO2)、苯乙烯(St)为单体,合成冰片烯-二氧化硫-马来酸酐(BE-SO2-Ma)以及冰片烯-二氧化硫-苯乙烯(BE-SO2-St)两种三元共聚物。讨论了单体配...
氨基葡萄糖-镝配合物的合成和抗羟自由基活性
氨基葡萄糖-镝配合物 合成 羟自由基
2009/11/13
用D-氨基葡萄糖盐酸盐与氯化镝反应，制备了氨基葡萄糖-镝配合物. 用元素分析、电导率、红外光谱、紫外光谱、X射线光电子能谱等分析测试手段对配合物进行了表征. 以EDTANa2×Fe(II)-H2O2体系产生羟自由基(×OH)研究氨基葡萄糖与氨基葡萄糖-镝配合物对羟自由基的清除作用. 结果表明，氨基葡萄糖与Dy3+形成了配合物，其中氨基葡萄糖氨基上的N和仲羟基的O及Cl-参与了配位. 该配合物对×O...
