检索结果-南通市图书馆

SYNTHESIS AND CHARACTERIZATION OF polyamides DERIVED FROM(4-(4-(2,6-DIPHENYLPYRIDIN-4YL)PHENOXY)PHENYL)-3,5-DIAMINOBEZAMIDE

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Polymer Science 2012年第1期30卷 82-92页

作者： Mousa Ghaemy Soheila Khajeh Faculty of Chemistry University of Mazandaran BabolsarIran

New types of polyamides containing pendent triaryl pyridine groups were successfully synthesized by direct polycondensation of a symmetry diamine,（4-（4-（2,6-diphenylpyridin-4yl）phenoxy）phenyl）-3,5-diaminobezamide（DPDAB）, and various aromatic and aliphatic dicarboxylic diacids in NMP using triphenyl phosphate（TPP） and pyridine as catalyst. The diamine and all the prepared polyamides were fully characterized by using FT-IR,~1H-NMR,UV-Vis spectroscopy, fluorimetry and elemental *** inherent viscosity of polyamides ranged from 0.45 dL/g to 0.68 dL/*** the polymers exhibited solubility in common polar aprotic solvents such as NMP,DMAc,DMF,DMSO,pyridine,HMPA,and even in less polar solvents such as THF and m-cresol at room *** properties of polyamides were evaluated by means of DSC,DMTA and *** polymers showed glass transition temperatures（T_g） in the range of 138-210℃. Their initial decomposition temperature（T_i） varied from 265℃to 310℃under N_*** dilute solution（0.2 g/dL） of polyamides in DMF exhibited fluorescence emission withλ_（max） in the range of 470-550 nm.

关键词： polyamides Synthesis Direct polycondensation Solubility Thermal stability

SYNTHESIS AND CHARACTERIZATION OF ORGANOSOLUBLE polyamides FROM QUINOXALINE BASED DIAMINE

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Polymer Science 2010年第2期28卷 147-155页

作者： Hossein Mighani Mousa Ghaemy Department of Chemistry University of Golestan Department of Chemistry University of Mazandaran

Aromatic/aliphatic polyamides were synthesized from a diamine monomer, 2,3-bis-p-aminophenylquinoxaline （IV）, based on quinoxaline and various dicarboxylic acids of aliphatic, aromatic and heterocyclic. The diamine and polyamides were characterized by elemental analysis, FTIR and IH-NMR. The solubility of the polyamides was affected by the quinoxaline and heterocyclic groups in the polymer chain. They were all soluble in common organic solvents such as dimethylsulfoxide （DMSO）, N,N-dimethylformamide （DMF） and N-methylpyrolidone （NMP）. The polyamides showed inherent viscosity in the range of 0.25-0.3 dL/g in DMSO at 25℃ and good thermal stability with the char yields in the range of 65%-82% at 600℃ in nitrogen.

关键词： Quinoxaline polyamides Solubility Thermal stability

Sustainable polyamides Enabled by Controlled Ring-opening Polymerization of 4-Hydroxyproline-derived Lactams

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Polymer Science 2023年第5期41卷 728-734,I0008页

作者： Jian-Qun Wang Xian-Hong Wang You-Hua Tao Key Laboratory of Polymer Ecomaterials Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun 130022China University of Science and Technology of China Hefei 230026China

Aliphatic polyamides have been considered as eco-friendly materials,useful for a wide range of ***,it still presents obstacle to produce sustainable aliphatic polyamides from abundant renewable ***,we describe that 4-hydroxyproline(4-HYP),a renewable resource,was readily converted to its corresponding bicyclic bridged lactam monomers bearing pendant Boc-protected secondary amino group,and oligo-ethylene glycol *** hexamethyldisilazide(LiHMDS)-mediated polymerization of the resulting monomers exhibited a controlled feature,affording sustainable aliphatic polyamides with number-average molecular weight up to 73 kg/mol and a low molecular weight distribution?polyamides with potential applications,including degradable plastics,and drug delivery.

关键词： polyamides Renewable Ring-opening polymerization 4-Hydroxyproline

SYNTHESIS AND CHARACTERIZATION OF SCHIFF-BASE-CONTAINING polyamides

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Polymer Science 2011年第2期29卷 149-155页

作者： Mousa Ghaemy Hossein Mighani Raouf Alizadeh Department of Chemistry Mazandaran UniversityBabolsarIran

A series of new Schiff base polyamides（PAs） were synthesized by polycondensation of benzilbisthiosemicarbazone diamine（LH6） with different commercially available aliphatic and aromatic diacid chlorides. The monomer and all the PAs were characterized by FTIR,^1H-NMR,and elemental *** prepared polyamides showed inherent viscosities in the range of 0.30-0.36 dL/g in DMF at 25℃,indicating their moderate molecular *** PAs were completely soluble in aprotic polar solvents such as dimethylformamide（DMF）,N-methylpyrolidone（NMP）, tetrachloroethane（TCE）,dimthylsulfoxide（DMSO） and also in H_2SO_4 and partially soluble in THF,acetone and chloroform at room *** analysis showed that these PAs were practically amorphous and exhibited 10%weight loss above 220℃.

关键词： polyamides Schiff base polymers Solubility Thermal stability

ORGANOSOLUBLE,THERMALLY STABLE polyamides CONTAINING SULFONE AND SULFIDE UNITS

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Polymer Science 2009年第6期27卷 781-787页

作者： Shahram Mehdipour-Ataei Mehdi Hatami Mohammad Hossein Mosslemin Iran Polymer and Petrochemical Institute Department of Chemistry Isfahan University of Technology Department of Chemistry Islamic Azad University

A new diamine containing sulfone,sulfide and amide groups was synthesized via a three-step reaction process. The nucleophilic substitution reaction of 4-aminothiophenol with 4-nitrobenzoyl chloride in the presence of propylene oxide (PO) afforded N-(4-mercaptophenyl)-4-nitrobenzamide(MPNB).The catalytic reduction of the nitro group in MPNB to amino group was accomplished by using Pd/C and hydrazine monohydrate to produce 4-amino-N-(4-mercapto phenyl)benzamide(AMPB).Reaction of two moles of AMPB with bis(4-c...

关键词： Polymerizations Polycondensation Nucleophilic substitution polyamides Thermal properties

High Glass Transition and Optical Transparency of Novel Organosoluble polyamides Containing 4-tert-Butyltoluene Moiety

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemistry 2011年第10期29卷 2197-2201页

作者：汪称意赵晓燕李光江建明 Changzhou Key Laboratory for Polymer Materials School of Material Science and Engineering Changzhou University Changzhou Guangdong 213164 China School of Petrochemical Engineering Changzhou University Changzhou Guangdong 213164 China State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of Material Science and Engineering Donghua University Shanghai 201620 China

A series of novel polyamides 3a-3d containing 4-tert-butyltoluene moiety, were prepared using the phosphorylation polycondensation technique. FT-IR and 1↑H NMR techniques were used to investigate the chemical structures of 3a-3d. The results confirmed that they agreed with the proposed structures for 3a-3d completely. The 3a-3d had inherent viscosities ranging from 0.71 to 1.67 dL·g^-1. All the polyamides showed excellent solubility, with the dissolvability at a concentration of 10 wt% in most amide polar solvents. Flexible and tough polyamide films could be prepared by casting from DMAc （N,N-dimethylacetamide） solvent. Their films were nearly colorless and exhibited high optical transparency, with the UV cutoff wavelength in the range of 346-363 nm and transmittance higher than 80% at 450 nm. They also exhibited high glass transition temperatures in the range of 310---343℃ and the onset decomposition temperatures in the range of 435-462 ℃ in nitrogen atmosphere. Meanwhile, these polyamide films possess good mechanical properties with tensile strengths of 76.4-86.1 MPa and elongations at break of 11.2%-27.3%. Due to those properties, these polyamides could be considered as photoelectric and microelectronic materials.

关键词： polyamides solubility optical transparency

Synthesis of organosoluble polyamides with bulky triaryl imidazole pendent group

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2009年第8期20卷 961-964页

作者： Mousa Ghaemy Hossein Behmadi Raouf Alizadeh Faculty of Chemistry Mazandaran UniversityBabolsar 47416-1467 Iran

New unsymmetrical diamine monomer containing triaryl imidazole pendent group, 4-[4-（4,5-diphenyl-1H-imidazol-2-y1）phe- noxy]-1,3-benzenediamine, was synthesized via aromatic substitution reaction of 1-chloro-2,4-dinitrobenzene with 4-（4,5- diphenyl-1H-imidazol-2-y1）pbenol, followed by palladium-catalyzed hydrazine reduction. This new monomer was further confirmed by FT-IR, IH NMR and ^13C NMR. Novel polyamides having pendant triaryl imidazole group were prepared by the phosphorylation polycondensation of four commercially aromatic dicarboxylic acids with the prepared diamine. Inherent viscosities of polyamides were in the range 0.42-0.53 dL/g indicating formation of medium molecular weight polymers. polyamides exhibited glass-transition temperature （Tg） in the range 236-265 ℃. These polymers are essentially amorphous and were soluble in polar aprotic solvents such as DMF, NMP, DMAc. The 10% weight loss temperatures in air atmosphere, measured by TGA were in the range 350-373 ℃ indicating their good thermal stabilities. ？2009 Mousa Ghaemy. Published by Elsevier B.V. on behalf of Chinese Chemical Society. All rights reserved.

关键词： polyamides Bulky pendent group Thermal properties Imidazole

Synthesis and Characterization of polyamides Based on Dimer Acid

在线全文

学校读者我要写书评

暂无评论

Journal of Wuhan University of Technology(Materials Science) 2009年第3期24卷 367-370页

作者：王文志章永化 College of Materials Science and Engineering South China University of Technology

A series of dimer acid-based polyamides were synthesized by melt-polycondensation of dimer acid and various aromatic diamines, and were characterized by Fourier transform infrared spectrum （FT-IR） and nuclear magnetic resonance （^1H NMR）. The physical properties of the polyamides, such as glass transition temperature, melting temperature, decomposition temperature and mechanical properties were also investigated. The polyamides＇ intrinsic viscosity ranges from 1.8 dL·g^-1 to 2.2 dL·g^-1, and the melting temperature ranges from 140 ℃ to 181 ℃. The glass transition temperatures, observed from dynamic mechanical analysis, fall in the range of 34.8-48.2 ℃. The physical and mechanical properties of the resultant polyamides are similar to those of the PA1212. The heat resistance and mechanical properties of poly （4, 4′-diphenylsulfone dimeramide）（PSD） and poly（4, 4′-di pb enyl dimeramide）（PPDI） are comparable to those of PA 1212.

关键词： polyamides dimer acid polycondensation aromatic diamines

Downregulation of c-myc gene overexpression by chirally-modified polyamides mediating apoptosis of cancer cells

在线全文

学校读者我要写书评

暂无评论

Downregulation of c-myc gene overexpression by chirally-modi...