共查询到19条相似文献,搜索用时 125 毫秒
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聚酚氧磷腈的合成及其热分解过程 总被引:5,自引:0,他引:5
聚酚氧磷腈的合成及其热分解过程胡源1桂宙1藤本康弘2范维澄1田村昌三3(1中国科学技术大学合肥230026;2日本劳动省产业安全研究所;3日本东京大学)聚磷腈是一类骨架由磷和氮原子交替排列的无机高分子化合物。由于磷原子上有两个可取代的基团,赋予了它可... 相似文献
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合成制备了聚磷腈类高分子——聚[(六氟异丙氧基)2-x(三氟乙氧基)x]磷腈,并通过NMR、FTIR、XRD、GPC、DSC等测试手段对聚合物进行了结构表征和性能测试,通过压力法透气性能测定仪测定了聚合物膜对N2、O2、CH4、CO2、He、H2等气体的透过性能.结果表明,三氟乙氧基的竞争取代能力较六氟异丙氧基稍强;得到x值分别为1.64、1.72和1.81的3种聚合物;其玻璃化温度Tg为-20.21℃、-42.83℃和-43.41℃;重均分子量为5.06×105、1.49×105和2.69×105;两种取代基比例适中时显示出较高的气体透过性能,渗透系数PN2=20barrer,PCO2=124barrer,PHe=85barrer;CO2/CH4和He/CH4的选择系数达到11.5和4.8,在天然气的净化和回收He中显示了潜力;H2/N2的选择系数达到6,而PH2=43barrer,在合成NH3尾气中回收H2存在发展前景。 相似文献
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以六氯环三聚磷腈为原料通过真空热开环聚合制得线型聚二氯磷腈(PDCP),再通过对PDCP进行亲核取代合成制备了新的聚膦腈类高分子--聚[(四氟丙氧基)2-x(三氟乙氧基).]膦腈,聚合物经过四氢呋喃-苯反复溶解-沉淀得到纯化产物.通过31P-NMR、1H-NMR和FTIR对其结构进行了表征;DSC法测定其玻璃化转变温度... 相似文献
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Singh A Steely L Allcock HR 《Langmuir : the ACS journal of surfaces and colloids》2005,21(25):11604-11607
Nanofibers of poly[bis(2,2,2-trifluoroethoxy)phosphazene] were produced by electrospinning from solutions in tetrahydrofuran, methylethyl ketone, and acetone. The fiber diameter varied from 80 nm to 1.4 microm by changes in the concentration of the polymer solution. The electrospun nonwoven mats showed enhanced surface hydrophobicity compared to spun cast films with up to a 55 degrees increase in water contact angle. The hydrophobicity varied with fiber diameter and surface morphology, with contact angles to water being in the range of 135 degrees -159 degrees. A low value of hysteresis (<4 degrees) was recorded for the superhydrophobic surfaces. The extremely high hydrophobicity of these mats is a combined result of a fluorinated surface and the inherent surface roughness of an electrospun mat. 相似文献
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Abid M. Amin Li Wang Haojie Yu Wael A. Amer Jingmin Gao Tai Yulei 《高分子科学杂志,A辑:纯化学与应用化学》2013,50(11):937-946
Polydichlorophosphazenes (PDCP) were synthesized through ring opening polymerization of hexachlorocyclotriphosphazene (HCCP). The polymerization behavior of HCCP under varying conditions of time and amount of catalyst was investigated. The chlorine atoms in polydichlorophosphazenes (PDCP) were substituted with p-oxybenzaldehyde and (or) diethylamine to synthesize poly[bis(p-oxybenzaldehyde diethylamino)phosphazenes](PPOBADEAP), poly[bis(p-oxybenzaldehyde)phosphazenes] (PPOBAP) and poly[bis(diethyl amino) phosphazenes] (PDEAP). The supporting evidence for the success of this synthesis was provided by nuclear magnetic resonance (1H-NMR, and 31P-NMR), gel permeation chromatography (GPC), and energy-dispersive X-ray spectroscopy (EDAX). The self-assembly behavior of PPOBADEAP, PPOBAP and PDEAP was observed in different solvents by the same concentration of polymers. The optical microscopy, scanning electron microscopy (SEM) and transmission electron microscopy (TEM) images indicated that PPOBADEAP formed various morphologies in different solvents while PPOBAP and PDEAP did not show self-assembly behavior at the same conditions. 相似文献
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《Journal of membrane science》1997,134(1):117-126
The sorption isotherms and diffusivities for vapors of some selected simple alcohols (methanol, ethanol, isopropanol, and 2-butanol), ketones (acetone, methyl ethyl ketone, and methyl isobutyl ketone), and aromatic compounds (benzene, toluene, and xylene) in poly[bis(trifluoroethoxy)phosphazene] (PTFEP) and poly[bis(phenoxy)phosphazene] (PPOP) were determined by integral sorption-desorption experiments at 35°C. The sorption isotherms for these compounds evaluated were almost linear to obey Henry's law for the determination of constant solubility of each solvent vapor species, and the corresponding permeabilities for them can be estimated according to the solution-diffusion model. The diffusivities for these vapors in PPOP (10−9∼10−8 cm2/s) were about one order smaller than those in PTFEP (10−8∼10−7 cm2/s) because the more rigid phenoxy groups and the higher crystallinity in PPOP may hinder the diffusion of sorbed molecules. Relatively weak dependence of diffusivity or permeability on the vapor activity (or concentration) was found, to be in contrast to the exponential dependence for many organic vapors in rubbery organic polymers, probably due to the limited increase of the free volume in sorption for these vapors in PTFEP and PPOP membranes. 相似文献
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Hitoshi Nakamura Tadakazu Miyata Koichiro Yonetake Toru Masuko Morio Kojima 《Macromolecular rapid communications》1995,16(3):189-196
The structural features of poly[bis(4-isopropylphenoxy)phosphazene] (PB(4-ip)PP) have been studied by electron microscopy, X-ray diffraction and differential scanning calorimetry techniques. Its orthorhombic lattice constants are determined as follows: a = 3,14 nm, b = 1,14 nm, c = 0,992 nm. The space group of this polymer is suggested to be P 212121–D, and the molecular conformation of the chains possibly to be (trans3cis)2. This polymer exhibits a crystal/crystal transition at 86°C below its T(1) transition (120°C). The thermal behavior is similar to the characteristics of poly[bis(p-methoxyphenoxy)phosphazene]. 相似文献
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Edward E. Flagg Donald L. Schmidt 《Journal of polymer science. Part A, Polymer chemistry》1972,10(11):3429-3446
A series of coordination polymers, poly[bis(phosphinatoalanyl)phosphonates], [X(Y)AlOP(R)(O)OAl(Y′)(X′)]n, were synthesized in which the terminal alanyl substituents (X,Y,X,′Y′) consisted of phosphinato (OPRR′O) or fluoro (F) moieties. The properties of the polymers were primarily dependent upon the type of terminal substituent and the hydrocarbon moieties (R,R′) on phosphorus. Polymers with four phosphinato moieties gave molecular weights M?n to 120000 with intrinsic viscosities [η] from 1.5 to 18; the corresponding solids were partially crystalline, melted before decomposition, and were film-forming when larger phosphorus substituents were incorporated. Sequential replacement of the phosphinato moieties with fluorine resulted in molecular weights below 10000 and low viscosities. The properties of the polymers are examined, and the roles of substituents on probable structures are discussed. 相似文献
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聚(二甘氨酸乙酯)磷腈的合成及其生物相容性 总被引:1,自引:0,他引:1
氨基酸酯基取代的聚磷腈由于具有优良的水解性能并能降解成无毒产物, 因而成为一类非常有吸引力的生物医用材料. 采用两步法合成了聚(二甘氨酸乙酯)磷腈(PEGP). 首先采用开环聚合的方法制备中间体聚二氯磷腈, 再利用亲核取代方法合成PEGP. 通过红外光谱、核磁共振及元素分析等确证了产物的结构. 用蒸汽压下降法测得PEGP的分子量为12959, 用DSC法测得其玻璃化转变温度为-21.5 ℃. 采用体外细胞培养的方法评价了肝癌细胞HepG2和人工合成纤维细胞在PEGP薄膜表面的生长性能. 结果表明, 该材料不但没有细胞毒性, 反而具有良好的促进细胞生长的能力, 显示聚(二甘氨酸乙酯)磷腈在组织工程和再生医学中的潜在应用价值. 相似文献
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《Journal of membrane science》1986,28(1):47-67
Polyphosphazenes were selected as a polymer system for membranes with high temperature stability and high chemical resistance. This relatively new class of compounds is based on a nitrogen/phosphorus backbone rather than a carbon backbone, and the literature reports high temperature stability. Poly[bis(trifluoroethoxy)phosphazene] was synthesized, and membranes were cast and tested. A test apparatus was designed and fabricated to allow high temperature testing. Diffusion experiments were performed with methanol, ethanol, isopropanol, and phenol. This membrane material is permeable to these alcohols and is stable up to 179°C. However, no separation was observed. 相似文献