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Two-dimensional FT-IR correlation spectroscopy was used to reveal the structural changes of isotactic polypropylene(iPP) mesophase during the heating process.The co-relationship among the regular helical bands of iPP was discussed according to synchronous spectrum.The results show that the segments with different length-helixes were found to undergo a disordered process in the temperature range of 25-60 ℃.
Two-dimensional FT-IR correlation spectroscopy was used to reveal the structural changes of isotactic polypropylene (iPP) mesophase during the heating process. The co-relationship among the regular helical bands of iPP was discussed according to a synchronous spectrum. The results show that the segments with different length-helixes were found to undergo a disordered process in the temperature range of 25-60 ° C.