Regensburg 2013 – scientific programme
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 19: Poster: Crystallization, Nucleation and Self Assembly
CPP 19.2: Poster
Tuesday, March 12, 2013, 18:15–20:15, Poster C
Transcrystallinity in isotactic polypropylene: synchrotron IR microspectroscopy and microfocus X-ray scattering — •Gonzalo Santoro1, Shun Yu1, Stephan V. Roth1, Ulrich Schade2, and Gary Ellis3 — 1HASYLAB at DESY, Notkestr. 85, 22607, Hamburg, Germany. — 2BESSY-II, Helmholtz-Zentrum Berlin, Albert-Einstein-Str. 15, 12489, Berlin, Germany. — 3Institute of Polymer Science and Technology, ICTP-CSIC, Juan de la Cierva 3, 28006 Madrid, Spain.
Isotactic polypropylene (iPP) is one of the most widely-used consumer polymers. It is a semicrystalline thermoplastic exhibiting four different polymorphs: the monoclinic α phase (thermodynamically the most stable and predominant under regular processing conditions), the trigonal β phase (promoted under special processing conditions, like crystallization under shear), the orthorhombic γ phase (present in materials with low molecular weight or regular chain defects) and a mesomorphic phase (a semi-ordered phase) [1]. Moreover, when crystallization takes place in the presence of fibers, transcrystalline morphologies can develop.
This work presents polarization modulated synchrotron IR microspectroscopy and microfocus X-ray scattering studies on the transcrystalline β-cylindritic phase of iPP, showing evidence for lamellar twisting along the growth direction [2,3].
[1] B. Lotz et al. Polymer 37, 22, 4979 (1996).
[2] J. Torre et al. Macromolecules 39, 16, 5564 (2006).
[3] G. Santoro et al. J. Phys.: Conf. Ser. 359, 012005 (2012).