TIT# Correlation of nanostructural parameters and macromechanical behavior of
     hyperbranched-modified polypropylene using time-resolved SAXS
AUT# Ganjaee Sari, Morteza; Stribeck, Norbert; Moradian, Siamak;
     Zeinolebadi, Ahmad; Bastani, Saeed; Botta, Stephan;
SOU# Polym. Int., (2013), 62(7), 1101-1111
LOC# xv138
CLA#
COM# DOI:10.1002/pi.4399
APP#
MAT#
ABS# Polypropylene (PP) is modified utilizing polyester amide-based hyperbranched polymer (PS).
     A maleic-modified PP (PM) used to enhance the compatibility. Usual
     tensile experiments are carried out. The nano-crystalline structure is
     studied by small angle X-ray scattering (SAXS) while uniaxial mechanical
     load is simultaneously applied. SAXS patterns are analyzed using
     procedures written in PV-WAVE. The chord distribution function, CDF, is
     calculated and nanostructural parameters such as long period ($l_p$) and
     nanodeformation ($\varepsilon_{Nano}$) are extracted. The correlations
     between macromechanical parameters and nanostructures are studied.
     Mechanical results show that PS has a plasticizing effect. Reactively
     blended samples demonstrate enhanced mechanical properties. SAXS patterns
     reveal a well-known structure of polypropylene as a peculiar architecture
     of nanostructure. Crystalline branching occurs in a geometry that is
     known as mother-daughter crystal lamellae structure, also named as
     cross-hatching structure. It is concluded that adding PS clearly distorts
     the stacking of crystalline domains. The structure information from SAXS
     patterns in reciprocal space is visualized in real space in the
     calculated CDFs. The CDFs depict that in simple blends, $l_p$ of the
     crystalline stacks increases compared to blank PP. Nevertheless, reactive
     blended samples show an increase of $l_p$ compared to blank PP however
     possess smaller $l_p$ compared to simple blends.