Mixed crystals in polymer blends: Polypropylene-polybutene-1 system |
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| Authors: | R M Gohil Petermann |
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| Institution: | 1. Key Laboratory of Materials Physics , Institute of Solid State Physics, Hefei Institutes of Physical Science, Chinese Academy of Sciences , Hefei, P. R. China kzheng@issp.ac.cn;3. Key Laboratory of Materials Physics , Institute of Solid State Physics, Hefei Institutes of Physical Science, Chinese Academy of Sciences , Hefei, P. R. China |
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| Abstract: | A method of preparing solid solutions of chemically different polymeric molecules in the crystalline state is reported. The characteristic feature of the method is the high longitudinal flow gradient in which one can achieve very high rates of crystallization as well as supercooling at constant temperature. In the present study, isotactic polypropylene-polybutene-1 blends of different compositions were investigated, and solid solutions were observed up to 20% on each side of the phase diagram. The resultant crystalline blends were investigated by using transmission electron microscopy (TEM) and electron diffraction, wide-angle x-ray diffraction, differential thermal analysis, and mechanical testing. Structural studies reveal the presence of needle-like crystals within the blends. The thermal stability of the blended crystals is unexpectedly high with no major changes in the structure upon annealing. The mechanical properties exhibit only small changes for the different blends. |
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| Keywords: | poly(ethylene terephthalate) (PET) attapulgite (AT) nanocomposites nonisothermal crystallization kinetics |
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