Molecular orientation behavior of isotactic polypropylene under uniaxial stretching by rheo-Raman spectroscopy
نویسندگان
چکیده
منابع مشابه
Raman spectroscopy study of lattice vibration and crystallographic orientation of monolayer MoS2 under uniaxial strain.
The false-color (3D type) image of the intensity of the Raman spectra of monolayer MoS2 versus both peak positions and polar angles is plotted. It shows that the strongest E2g (1+) and E2g (1-) peaks appear at different angles, reflected as the alternation of the maxima of the intensity within the frequency range of the E2g (1) mode, which is the consequence of the crystallographic orientation ...
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T. M. G. Mohiuddin,1 A. Lombardo,2 R. R. Nair,1 A. Bonetti,2 G. Savini,2 R. Jalil,1 N. Bonini,3 D. M. Basko,4 C. Galiotis,5 N. Marzari,3 K. S. Novoselov,1 A. K. Geim,1 and A. C. Ferrari2,* 1School of Physics and Astronomy, University of Manchester, Oxford Road, Manchester, M13 9PL,United Kingdom 2Department of Engineering, Cambridge University, Cambridge, CB3 0FA, United Kingdom 3Department of ...
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The detailed structure and molecular mobility of nascent isotactic polypropylene (iPP) powder was investigated using differential scanning calorimetry, transmission electron microscopy (TEM) and nuclear magnetic resonance (NMR). The crystallinity of the nascent iPP powder is approximately 33%, which is much lower than that of melt-quenched or isothermally crystallized iPP. Peaks from the variab...
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Using (13)C double quantum solid-state NMR spectroscopy, we were able to observe nuclei of a supramolecular BTA based additive on the nanoscale in a matrix of i-PP at a concentration of only 0.09 wt%. These nuclei exhibit the analogous structural features as the crystalline phase of the neat additive.
متن کاملExtensional-flow-induced crystallization of isotactic polypropylene
A filament stretching extensional rheometer with a custom-built oven was used to investigate the effect of uniaxial flow on the crystallization of polypropylene. Prior to stretching, samples were heated to a temperature well above the melt temperature to erase their thermal and mechanical histories and the Janeschitz-Kriegl protocol was applied. The samples were stretched at extension rates in ...
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ژورنال
عنوان ژورنال: Express Polymer Letters
سال: 2016
ISSN: 1788-618X
DOI: 10.3144/expresspolymlett.2016.63