A synchrotron X-ray study of melting and recrystallization in isotactic polypropylene
A synchrotron X-ray study of melting and recrystallization in isotactic polypropylene
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DOI：
10.1016/s0032-3861(96)00583-6
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发表时间：
1997-02
期刊：
影响因子：
4.6
通讯作者：
A. Ryan;J. L. Stanford;W. Bras;T. M. Nye
中科院分区：
文献类型：
--
作者：
A. Ryan;J. L. Stanford;W. Bras;T. M. Nye
SAXS/WAXS/d.s.c.在SRS下，跟踪了等规聚丙烯（iPP）的熔融和重结晶过程。三种技术之间的时间相关性是完美的，这三种技术在结晶度和动力学方面表现出良好的一致性。结晶度和片层厚度的iPP已计算从SAXS和WAXS图案，同时获得在熔融和结晶，通过集成的强度和相关函数技术。用小角X射线衍射（SAXS）的Lorentz校正谱图计算了长间距，并与相关函数（γ1）的计算结果进行了比较。结晶度由SAXS不变量和积分WAXS强度（由于晶体）的组合获得，局部结晶度由γ1获得。在熔融和再结晶过程中获得的数据进行了解释的多分散层状模型。
SAXS/WAXS/d.s.c. at the SRS has been used to follow the melting and recrystallization of isotactic polypropylene (iPP). The time correlation is perfect between the three techniques which show good agreement with respect to crystallinity and kinetics. The degree of crystallinity and the lamellar thickness of iPP have been calculated from SAXS and WAXS patterns, obtained simultaneously during melting and crystallization, by integrated intensity and correlation function techniques. The long spacing was obtained from the peak in the Lorentz-corrected SAXS pattern and was in good agreement with that calculated from the correlation fuction (γ1). The degree of crystallinity was obtained from a combination of the SAXS invariant and the integrated WAXS intensity (due to the crystals), and the local crystallinity was obtained from γ1. The data obtained during melting and recrystallization were interpreted in terms of a polydisperse lamellar model.