科研之友
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摘要
We successfully formed a series of inclusion complexes (ICs) between an alpha-cyclodextrin (alpha-CD) host and two kinds of guest polymers, nylon-6 and nylon-66. An attempt to achieve an intimate blend between nylon-6 and nylon-66 through the formation and dissociation of their common alpha-CD IC was made. The formation of all nylon ICs was verified with wide-angle X-ray diffraction, differential scanning calorimetry (DSC), and Fourier transform infrared (FTIR) and cross-polarized/magic-angle-spinning C-13 NMR spectroscopy. The experimental results demonstrated that alpha-CD could only host single nylon polymer chains in the IC channels, either nylon-6 or nylon-66 in their own complexes, and presumably either nylon in neighboring channels of their common IC. The IC-coalesced blend of nylon-6 and nylon-66 was obtained after the removal of the host cyclodextrin from their common IC with dimethyl sulfoxide. The spectroscopic results (FTIR and C-13 NMR) illustrated that there was a degree of intimate miscibility existing in the IC-coalesced blend, but not in the solution-cast physical blend, although X-ray diffraction patterns showed that the crystal structure of the IC-coalesced blend was similar to that of the physical blend. DSC thermal profiles suggested that nylon-66 first formed crystals during coalescence and that the subsequent crystallization of nylon-6 was greatly affected by the nylon-66 crystallites because of the close proximity of the two components in portions of the coalesced blend. DSC observations also demonstrated that the melting of the coalesced blend did not lead to complete phase separation of the nylon-6 and nylon-66 components.
- 出版日期2004-4-15
