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Study of nucleation induced structure modification in isotactic polypropylene by DMTA and solid state NMR
Author(s) -
Romankiewicz Anna,
Jurga Jan,
Sterzynski Tomasz
Publication year - 2003
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/masy.200351224
Subject(s) - tacticity , dynamic mechanical analysis , nucleation , materials science , glass transition , supercooling , polymer chemistry , phase (matter) , polypropylene , solid state nuclear magnetic resonance , chemical engineering , composite material , polymer , thermodynamics , chemistry , organic chemistry , nuclear magnetic resonance , physics , engineering , polymerization
Isotactic polypropylene (iPP) modified by heterogeneous nucleation and molten state drawing was investigated using the DMTA and NMR methods. The nucleation was realized by specific α and β nucleating agents, 1,3,2,4‐bis(3,4‐dimetylobenzylideno) sorbitol (Millad 3988, Miliken) leading to the creation of the α phase, and N,N′‐dicyklohexylo‐2,6‐naftaleno dikarboxy amid (NJ100) as the β phase promoter. The processing induced modification was performed by molten state drawing during an extrusion in the range between the die exit and the calibration unit. An increase of the glass transition temperature of iPP was found to be drawing independent for the β‐nucleated samples, and dependent in the case of the α‐iPP. Changes in the macromolecular mobility, depending on the α/β iPP structure and molten state drawing, was found by NMR lineshape and second moment measurements.