The far-infra-red spectra of crystalline isotactic polypropylene polymorphs |
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| Affiliation: | 1. Department of Laboratory Medicine and Pathology, Division of Transfusion Medicine, University of Minnesota, Minneapolis/Saint Paul, Minnesota, USA;2. Department of Pediatrics, Hematology, Oncology and Transplantation, University of Minnesota, Minneapolis/Saint Paul, Minnesota, USA;3. Department of Medicine, Hematology, Oncology and Transplantation, University of Minnesota, Minneapolis/Saint Paul, Minnesota, USA;4. Department of Pathology and Laboratory Medicine, University of Pennsylvania Cancer Center, Philadelphia, Pennsylvania, USA;5. Abramson Family Cancer Center Research Institute, University of Pennsylvania Cancer Center, Philadelphia, Pennsylvania, USA;6. Department of Microbiology, University of Pennsylvania Cancer Center, Philadelphia, Pennsylvania, USA;1. Chemical Engineering Department, School of Industrial Engineering (EEI), University of Vigo, Campus As Lagoas-Marcosende, 36310 Vigo-Pontevedra, Spain;2. Defense University Center, Naval Academy, University of Vigo, Plaza de España 2, 36920 Marín-Pontevedra, Spain;3. Materials Engineering Department, School of Industrial Engineering (EEI), University of Vigo, Campus As Lagoas-Marcosende, 36310 Vigo, Pontevedra, Spain |
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| Abstract: | Far-i.r. spectra of crystalline isotactic polypropylene (IPP) in its various polymorphic forms have been recorded over the range 500-100 cm−1. Differences in the spectra, in particular the splitting of certain A line-group modes, reflect the environments of isolated IPP chains within the particular unit cell configurations of the crystal forms. |
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