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An In Situ Small‐Angle X‐Ray Scattering Study of Propylene‐Butene and Propylene‐Ethylene Random Copolymers during Heating Process
Author(s) -
Tang Yujing,
Guo Meifang,
Wang Qiao,
Ren Minqiao,
Song Wenbo
Publication year - 2012
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.201100009
Subject(s) - small angle x ray scattering , tacticity , materials science , differential scanning calorimetry , copolymer , polypropylene , lamellar structure , ethylene propylene rubber , scattering , 1 butene , polymer chemistry , crystal (programming language) , melting point , ethylene , chemical engineering , polymer , composite material , thermodynamics , optics , organic chemistry , chemistry , polymerization , catalysis , computer science , programming language , engineering , physics
Summary: The micro‐structure evolution of isotactic polypropylene‐1‐butene (iPPBu) and polypropylene‐ethylene (iPPEt) random copolymers with 4 mol% of 1‐butene and ethylene was respectively investigated by differential scanning calorimetry (DSC) and in‐situ small angle X‐ray scattering (SAXS) techniques during heating process. The signal of melting enthalpy of iPPBu disappears a little earlier than that of iPPEt, which keeps consistent with the decay trend of scattering intensity during the late period of melting process. However, the SAXS data further show that the crystal thickness of iPPBu is a little larger than that of iPPEt during heating process. It is suggested that the melting behaviors of such copolymers depend on not only the lamellar thickness but also the crystal stability.