Chemical-physical aspects of formation and evolution of phase structure in multi-polymers: Intensity fluctuation, phase structure and its fractal characteristics in blends of isotactic polypropylene with poly(cis-1,4-butadiene) rubber  

作　　者：MA GuiQiu YANG YuPing HUANG DingHai SHENG Jing 

机构地区：[1]School of Materials Science and Engineering, Tianjin University, Tianjin 300072, China [2]Tianjin Key Laboratory of Composite and Functional Materials, Tianjin 300072, China

出　　处：《Science China Chemistry》2012年第5期854-864,共11页中国科学（化学英文版）

基　　金：support of the National Natural Science Foundation of China (51033004)

摘　　要：This paper studies the formation and evolution of phase structure of isotactic polypropylene/poly（cis-1,4-butadiene） （iPP/PCBR） blends during molten and mixing in a visual mixer by on-line analysis of the small angle light back scattering. The density fluctuation of iPP/PcBR blends during molten and mixing is discussed using the integral-intensity Js, of the scattering intensity of the blends. The ＂invariant＂ Q, which shows fluctuation of the system, is calculated by data of the small angle light back scattering, and the variation of Q with the blending time, temperature and shear rate during molten and mixing in iPP/PcBR blends is discussed. The structure parameters which characterize dimensions of phase in the blends, as the correlation distance ac, and the average chord lengths of two-phase, as lipp and lPcBR, are calculated by data of scattering intensity. The average diameters dp of dispersed phases are calculated from SEM images. The variation of ac, dp, lipp and lPcBR with the blending time and compositions in the blends during molten and mixing is discussed. The scale law is analyzed to find multi-scale char- acteristics in this system. The generalized fractal dimension Dp is calculated and the relation of Dp with generalized entropy function is discussed to determine that Dp is state function and the physical significance of Dp is the same as that of the generalized entropy function. polymer blends, on-line analysis, fractal, polypropyleneThis paper studies the formation and evolution of phase structure of isotactic polypropylene/poly(cis-1,4-butadiene) (iPP/PcBR) blends during molten and mixing in a visual mixer by on-line analysis of the small angle light back scattering. The density fluctuation of iPP/PcBR blends during molten and mixing is discussed using the integral-intensity Js, of the scattering intensity of the blends. The "invariant" Q, which shows fluctuation of the system, is calculated by data of the small angle light back scattering, and the variation of Q with the blending time, temperature and shear rate during molten and mixing in iPP/PcBR blends is discussed. The structure parameters which characterize dimensions of phase in the blends, as the correlation distance ac, and the average chord lengths of two-phase, as li PP and lP cBR, are calculated by data of scattering intensity. The average diameters dp of dispersed phases are calculated from SEM images. The variation of ac, dp, li PP and lP cBR with the blending time and compositions in the blends during molten and mixing is discussed. The scale law is analyzed to find multi-scale characteristics in this system. The generalized fractal dimension Dp is calculated and the relation of Dp with generalized entropy function is discussed to determine that Dp is state function and the physical significance of Dp is the same as that of the generalized entropy function.

关 键 词：polymer blends on-line analysis FRACTAL POLYPROPYLENE 

分 类 号：O631[理学—高分子化学] TQ325.14[理学—化学]