Polymorphic Behavior of Syndiotactic Polypropylene Induced by Heat Treatment

来源 :高等学校化学研究 | 被引量 : 0次 | 上传用户:ding7881
下载到本地 , 更方便阅读
声明 : 本文档内容版权归属内容提供方 , 如果您对本文有版权争议 , 可与客服联系进行内容授权或下架
论文部分内容阅读
The polymorphic behavior of syndiotactic polypropylene (s-PP) crystallized from the melt under different conditions was investigated by means of WAXD and DSC. The isothermal melt crystallization of s-PP proceeded in form I at tc≥110 ℃ and in form Ⅱ at tc
其他文献
Polyurethane elastomers derived from 4,4′-methylene bis(phenyl isocyanate), butylene glycol and the low oxyethylene moiety content copolyether of tetrahydrofur
The water dissociation mechanism on a bipolar membrane under the electrical field was investigated and characterized in terms of ionic transport and limiting cu
Two unbridged metallocene catalysts, bis(2,4,7-trimethylindenyl)zirconium dichloride (met-l) and bis(2,4,6-trimethylindenyl)zirconium dichloride (met-II), which
A novel compound was synthesized and characterized by means of elemental analysis, IR and UV spectra, TG, CV and single crystal X-ray diffraction. The compound
The direct method proposed by Clarkson and Kruskal is modified to obtain some conditional similarity solutions of a nonlinear physics model. Taking the (1+ 1 )-
Based on a modified version of the global color symmetry model, the pion susceptibilities of vacuum needed in the QCD sum rule external-field method for the cou
The time evolution of the Hamming distance (damage spreading) for the S = 1/2 and S = 1 Ising models on the square lattice is performed with a special metropoli
Aim: To investigate the effect of a new mechanically induced cryptorchidism model on rat epididymal histology.Methods: Eighteen 21-day-old Sprague Dawley rats w
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
Three unbridged metallocenes, bis(2,4,7-Mea-indenyl)zirconium dichloride (1), bis (2-Me4,7-Etz-indenyl) zirconium dichloride (2) and bis (2,4,6-Me3-indenyl) zir