【摘 要】
：
The monomolecular particle agglomerates of polystyrenes were obtained by freeze-drying of its very dilutesolutions of 1.3 x 10-5-2.0 x 10-s g/mL in benzene:cylc
【机 构】
：
Research Center of Materials,Department of Chemistry
论文部分内容阅读
The monomolecular particle agglomerates of polystyrenes were obtained by freeze-drying of its very dilutesolutions of 1.3 x 10-5-2.0 x 10-s g/mL in benzene:cylcohexane (100:1) solvents, and they were annealed at roomtemperature for hundred days before use. According to 13C-NMR measurement the polystyrenes should be practically atactic.The number average molecular weights of the samples are 2.80 x 103, 2.00 x 104, and 1.55 x 106, respectively. The freeze-dried aPS with a molecular weight higher than 104 show two new IR absorption bands at 1098 and 1261 cm-1, which areabsent in the normal aPS and freeze-dried styrene oligomer. it was also found that the low molecular weight samples canonly form powders, whereas the freeze-dried aPS with higher molecular weight form a mixture of powders and fibrils, ofwhich the longer fibrils show a much stronger 1261 cm-1 band than the shorter fibrils and the powder. It seems that the1261 cm-1 band corresponds to the stacking behavior of monomolecular particles.
其他文献
利用准经典轨线理论,在BW2和G3两个势能面上,研究了Cl+HD反应的动力学.计算结果表明,产物的转动取向对势能面及反应体系的质量因子非常敏感.在BW2势能面上,计算的两个产物的
为探究吕家坨井田地质构造格局,根据钻孔勘探资料,采用分形理论和趋势面分析方法,研究了井田7
The reaction of crossed diperoxidation between the cyclic ketones and the alkyl ketones was investigated. The reaction is a competing in different ketones. It i
Ti-incorporated mesoporous silica materials with pore diameters of 3-4 nm have been prepared via the co-hydrolysis and co-condensation reactions, that is the so
A new limonoid named rohituka-15 1,with a known limonoid dregeana-1 2,was isolated from the seed of Aphanamixis polystachya (Meliaceae).The 13C NMR data assignm
For compressible two-phase displacement problem, a kind of upwind operator splitting finite difference schemes is put forward and make use of operator splitting
首先利用数字滤波方法对淮河流域试验的大气边界层湍流观测资料进行三项分解,将大气边界层湍流的风速信号分解为近似各项同性的小尺度涡和各向异性的大尺度涡.然后再将大尺度
The ESR spectra of catalyst V2O5/γ-Al2O3 and its activity for the dehydrogenation of isobutane were investigated. On the basis of the results of the ESR spectr
The generalized noncommutative torus Tkp of rank n was defined in [4] by the crossed product noncommutative torus Ap of rank n. It is shown in this paper that T
文献[2]中,给出了R上奇偶延拓的Hardy-Litlewood算子的定义,并证明了Hardyy-Litle-wood算子在函数空间BMO上的有界性.在此基础上进一步研究了该算子在函数空间LiPα(R)(0＜α＜1)