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Correlation of nanostructural parameters and macromechanical behaviour of hyperbranched‐modified polypropylene using time‐resolved small‐angle X‐ray scattering measurements
Author(s) -
Sari Morteza Ganjaee,
Stribeck Norbert,
Moradian Siamak,
Zeinolebadi Ahmad,
Bastani Saeed,
Botta Stephan
Publication year - 2013
Publication title -
polymer international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.592
H-Index - 105
eISSN - 1097-0126
pISSN - 0959-8103
DOI - 10.1002/pi.4399
Subject(s) - small angle x ray scattering , materials science , lamellar structure , polypropylene , scattering , composite material , ultimate tensile strength , nanostructure , polymer , chemical engineering , polymer chemistry , nanotechnology , optics , physics , engineering
Polypropylene ( PP ) is modified utilizing a poly(ester amide)‐based hyperbranched polymer ( PS ). A maleic‐modified PP is used to enhance the compatibility. Usual tensile experiments are carried out. The nanocrystalline structure is studied using small‐angle X‐ray scattering ( SAXS ) while a uniaxial mechanical load is simultaneously applied. SAXS patterns are analysed using procedures written in PV‐WAVE . The chord distribution function ( CDF ) is calculated and nanostructural parameters such as long period ( l p ) and nanodeformation ( ϵ 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 PP as a peculiar architecture of the nanostructure. Crystalline branching occurs in a geometry that is known as a mother–daughter crystal lamellar structure, also called a crosshatching structure. It is concluded that adding PS distorts the stacking of crystalline domains. The structural information from SAXS patterns in reciprocal space is visualized in real space in the calculated CDFs . The CDFs indicate that in simple blends, l p of the crystalline stacks increases compared to blank PP . Nevertheless, reactively blended samples show an increase of l p compared to blank PP ; however, they possess smaller l p compared to simple blends. © 2012 Society of Chemical Industry