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芳香聚酰胺具有优异的热稳定性,但在溶剂中的溶解性能较差。人们发现在聚酰胺中的苯环上引进甲基取代基是改善聚合物溶解性能的一种有效的途径,Takatsuka等曾合成了一系列一取代和二取代甲基的芳香聚酰胺,聚合物的溶解性有较大的改善。但尚未见关于三甲基取代聚合物的合成报道。 相似文献
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高分子量芳香共聚酰胺的合成 总被引:1,自引:0,他引:1
系统地对对苯二甲酰氯、对苯二胺和4,4′-二氨基二苯醚三元共缩聚体系低温溶液聚合的多种影响因素进行了研究,得到对数比浓粘度为5.8~7.0dl/g的芳香共聚酰胺。实验结果表明:反应时间、反应温度、二酰氯与二胺的摩尔比、酸吸收剂吡啶用量、助溶盐氯化锂用量、4,4′-二氨基二苯醚用量以及单体浓度对共缩聚物的对数比浓粘度都有较大影响。 相似文献
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在浓硫酸和3-巯基丙酸催化下,3′-三氟甲基苯基-2,2,2-三氟苯乙酮(1)和甲苯于40~50℃下缩合反应8 h,制得中间体-1,1-二(4-甲基苯基)-1-(3′-三氟甲基苯基)-2,2,2-三氟甲基乙烷(2),继而在光照和N-溴代丁二酰亚胺促进下,将中间体氧化得到二羧酸-1,1-二(4-羧基苯基)-1-(3′-三氟甲基苯基)-2,2,2-三氟甲基乙烷(3),二步反应总收率为77.4%.采用Yamazaki体系,3和9,9-二[(4-氨基苯氧基)苯基]呫吨进行溶液亲核缩聚反应,制得了一种高分子量的(数均分子量为43000,分子量分布为1.8)新型含三氟甲基和呫吨结构的聚酰胺.该聚酰胺为非晶态结构并具有良好的透光率(λcutoff=330 nm),其玻璃化转变温度(Tg)为242℃,在氮气气氛中5%的热失重温度(Td5)为465℃,800℃时的残炭率为50%.聚合物易溶于N,N-二甲基乙酰胺(DMAc)、N-甲基吡咯烷酮(NMP)、间甲酚、吡啶(Py)和四氢呋喃(THF)等有机溶剂中,并可浇注得到韧性好和透明的薄膜,其拉伸强度为85 MPa,拉伸模量为2.0 GPa,断裂伸长率为10%.同时,该聚合物的体积电阻、表面电阻和介电常数分别为2.85×1015Ωcm,4.23×1014Ω和3.55(100 Hz),呈现了良好的电绝缘性能. 相似文献
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以对甲基苯磺酸和氧化钙为原料,采用溶剂挥发法,在室温下培养配合物[Ca(H2O)4](p-CH3C6H4SO3)2。通过红外光谱、热重对其进行表征,X-射线单晶衍射检测确定其晶体结构,并详细描述了配合物的配位行为和晶体结构特点。由数据可知,配合物的中心离子与磺酸根离子和水配位,属于Triclinic晶系,■空间群;晶胞参数a=6.3663(11)nm,b=6.7987(13)nm,c=12.544(2)nm,α=83.807(3)°,β=89.197(3)°,γ=71.206(3)°,V=510.87(16)nm3,Z=1。此外,研究了该配合物对Biginelli反应的催化性能,结果表明,配合物催化效果较好(CCDC:2094911)。 相似文献
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以对氨基苯磺酰胺、丙烯酰氯(或甲基丙烯酰氯)为原料合成了N-[4-(磺酰胺)苯基]丙烯酰胺(ASPAA)和N-[4-(磺酰胺)苯基]甲基丙烯酰胺(ASPMAA),其结构经^1H NMR,IR和元素分析表征。合成ASPAA的最佳条件:对氨基苯磺酰胺13.76g(80mmol),n(对氨基苯磺酰胺):n(丙烯酰氯)=1.0:1.1,n(丙烯酰氯):n(NaHCO3):1.00:1.14,0℃~2℃反应3h,反应液倾入10倍体积的的甲醇-水[V(甲醇):V(水)=1:10]中析出产物,收率在60%以上。合成ASPMAA的最佳条件:对氨基苯磺酰胺6.88g(40mmol),n(对氨基苯磺酰胺):n(甲基丙烯酰氯)=1.00:1.05,n(三己胺):n(甲基丙烯酰氯):1.0:1.0,在0℃~2℃滴加甲基丙烯酰氯后先在室温下反应1h,然后在60℃反应1h,反应液倾入700mL石油醚中析出产物,收率50%~60%. 相似文献
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采用含叔丁基二胺的单体3,3′-二叔丁基-4,4′-二氨基二苯基-4″-叔丁基苯基甲烷(TADBP)分别与萘-1,4-二甲酸、间苯二甲酸和4,4-二苯醚二甲酸3种二酸单体通过Yamazaki膦酰化法缩聚制得一系列新型可溶性芳香聚酰胺(PA)。通过FT-IR、~1 H-NMR、TG、DSC等测试手段研究了含叔丁基芳香聚酰胺的结构与性能,以及聚合物结构对其溶解性能、热性能的影响。结果表明:PA具有优异的溶解性能,常温下不仅能溶于高沸点的N-甲基吡咯烷酮(NMP)、N,N-二甲基乙酰胺(DMAc)、N,N-二甲基甲酰胺(DMF)、二甲基亚砜(DMSO)等强极性溶剂中,加热条件下甚至能溶于四氢呋喃、氯仿、二氯甲烷等低沸点溶剂;同时,PA还具有良好的热性能,玻璃化转变温度(Tg)为188~193℃,氮气氛围下失重5%和10%时的热失重温度分别为391~416℃和404~437℃。 相似文献
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《高分子科学杂志,A辑:纯化学与应用化学》2013,50(5):425-435
Novel aromatic polyamides were prepared from aromatic diamine containing 4,5-imidazolediyl unit, either by low temperature solution polycondensation or by direct polycondensation. Used diamines were 4,5-bis(4-aminophenyl)-2-phenylimidazole 1, 4,5-bis[4-(4-aminophenyl)]-2-(4-methylphenyl)imidazole 2 and 4,5-bis[4-(4-aminophenoxy)phenyl]-2-phenylimidazole 3. The obtained aromatic polyamides were produced with moderate to high inherent viscosity and soluble in polar aprotic solvents such as N,N-dimethylacetamide (DMAc), 1-methyl-2-pyrrolidone (NMP), N,N-dimethylformamide (DMF) and dimethyl sulfoxide (DMSO). Thermogravimetric analysis showed those polymers were stable up to 422°C in nitrogen atmosphere. The glass transition temperature (T g)s of the polymers derived from diamine 3 were in the range between 243 and 275°C, and these values were approximately 120–160°C lower than those analogue polyamide I series containing no phenoxy units. The properties of polyamide I series are also compared with those of analogue polymers that order of aromatic nuclei and amide linkage is reversible. 相似文献
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Der‐Jang Liaw Been‐Yang Liaw Jun‐Jang Hsu Ying‐Chi Cheng 《Journal of polymer science. Part A, Polymer chemistry》2000,38(24):4451-4456
A series of new polyesters was prepared from terephthaloyl (or isophthaloyl) chloride acid with various cardo bisphenols on solution polycondensation in nitrobenzene using pyridine as hydrogen chloride quencher at 150 °C. These polyesters were produced with inherent viscosities of 0.32–0.49 dL · g−1. Most of these polyesters exhibited excellent solubility in a variety of solvents such as N,N‐dimethylformamide, tetrahydrofuran, tetrachloroethane, dimethyl sulfoxide, N,N‐dimethylacetamide, N‐methyl‐2‐pyrrolidinone, m‐cresol, and o‐chlorophenol. The polyesters containing cardo groups including diphenylmethylene, tricyclo[5.2.1.02,6]decyl, tert‐butylcyclohexyl, phenylcyclohexyl, and cyclododecyl groups exhibited better solubility than bisphenol A–based polyesters. These polymers showed glass transition temperatures (Tg's) between 185 °C and 243 °C and decomposition temperatures at 10% weight loss ranging from 406 °C to 472 °C in nitrogen. These cardo polyesters exhibited higher Tg's and better solubility than bisphenol A‐based polyesters. © 2000 John Wiley & Sons, Inc. J Polym Sci A: Polym Chem 38: 4451–4456, 2000 相似文献
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A new monomer, N,N′‐bis(4‐phenoxybenzoyl)‐p‐phenylenediamine (BPBPPD), was prepared by the condensation of p‐phenylenediamine with 4‐phenoxybenzoyl chloride in N,N‐dimethylacetamide (DMAc). Novel aromatic poly(ether amide amide ether ketone ketone)s (PEAAEKKs) were synthesized by electrophilic Friedel–Crafts solution copolycondensation of BPBPPD with a mixture of terephthaloyl chloride (TPC) and isophthaloyl chloride (IPC), over a wide range of TPC/IPC molar ratios, in the presence of anhydrous aluminum chloride and N‐methylpyrrolidone (NMP) in 1,2‐dichloroethane (DCE). The influences of reaction conditions on the preparation of polymers were examined. The polymers obtained were characterized by different physico–chemical techniques such as FT‐IR, Differential scanning calorimetry (DSC), Thermogravimetric analysis (TGA), and wide angle X‐ray diffraction (WAXD). The polymers with 70–100 mol% IPC are semicrystalline and have remarkably increased Tgs over commercially available poly(ether ether ketone) (PEEK) and poly(ether ketone ketone) (PEKK) due to the incorporation of amide groups in the main chain. The polymers with 70–80 mol% IPC had not only high Tgs of 209–213°C, but also moderate Tms of 339–348°C, which are suitable for melt processing. The polymers with 70–80 mol% IPC had tensile strengths of 107.5–109.8 MPa, Young's moduli of 2.53–2.69 GPa, and elongations at break of 9–11% and exhibited high thermal stability and good resistance to organic solvents. Copyright © 2009 John Wiley & Sons, Ltd. 相似文献
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以含4-咪唑和羧酸基团的双功能基团4-咪唑基苯甲酸(HL1)为配体,用水热法合成了2个超分子化合物[Cd(L1)(HL1)I] (1)和[Co2(L1)4(H2O)8] (2),并进行了元素分析、红外、热重、粉末衍射及X-射线单晶衍射等表征。晶体结构解析结果表明:配合物1属于单斜晶系,P21/c空间群,L1-配体连接Cd(Ⅱ)离子成一维链,这些一维链通过氢键连接成三重贯穿的α-Po结构的超分子聚合物;配合物2不对称结构单元中,存在3种不同的金属Co(Ⅱ)中心单核分子,这些相互独立的分子单元通过丰富的氢键连接成三维的聚合物。同时,对配合物1室温下的固体荧光性质和配合物2对气体的吸附性能进行了研究。 相似文献
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以含4-咪唑和羧酸基团的双功能基团4-咪唑基苯甲酸(HL1)为配体,用水热法合成了2个超分子化合物[Cd(L1)(HL1)I](1)和[Co2(L1)4(H2O)8](2),并进行了元素分析、红外、热重、粉末衍射及X-射线单晶衍射等表征。晶体结构解析结果表明:配合物1属于单斜晶系,P21/c空间群,L1-配体连接Cd( Ⅱ)离子成一维链,这些一维链通过氢键连接成三重贯穿的α-Po结构的超分子聚合物;配合物2不对称结构单元中,存在3种不同的金属Co( Ⅱ)中心单核分子,这些相互独立的分子单元通过丰富的氢键连接成三维的聚合物。同时,对配合物1室温下的固体荧光性质和配合物2对气体的吸附性能进行了研究。 相似文献