writer：8. Yongxin Duan, Jianming Zhang*, Haibo Chang, Shouke Yan, Chunming Yang, Isao Takahashi, and Yukihi
keywords：Polarized Infrared Spectroscopy,Situ Synchrotron SAXS,Polycarprolactone
source：期刊
specific source：Macromolecules 2010, 43, 5315-5322.
Issue time：2010年

Melting behavior of epitaxially crystallized polycarprolactone (PCL) on a highly oriented polyethylene (PE) substrate was investigated by synchrotron small-angle X-ray scattering (SAXS) and Fourier transform infrared spectroscopy (FTIR). It is found that two dominant crystal thicknesses are clearly identified in the final melting stage around the melting point. In contrast to the normal melting process of polymers, the original PCL crystal and the melt-reorganized one with various lamellar thicknesses are molten and diminished simultaneously. During the melting process, orientations of the residual crystal and ordered all-trans PCL chain are found to be kept. However, the average chain orientation relaxation in the amorphous region is synchronously decreased with the evolution of melting process. A sliding diffusion mechanism was used to explain the melt behavior of PCL on the highly oriented PE substrate.