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Polypropylene/thermoplastic polyester elastomer blend: Crystallization properties, rheological behavior, and foaming performance
Author(s) -
Liu Bujin,
Jiang Tuanhui,
Zeng Xiangbu,
Deng Rong,
Gu Jun,
Gong Wei,
He Li
Publication year - 2021
Publication title -
polymers for advanced technologies
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.61
H-Index - 90
eISSN - 1099-1581
pISSN - 1042-7147
DOI - 10.1002/pat.5240
Subject(s) - materials science , polypropylene , composite material , polyester , rheology , nucleation , elastomer , thermoplastic , crystallization , polyamide , glycidyl methacrylate , foaming agent , thermoplastic elastomer , extrusion , polymer , chemical engineering , polymerization , copolymer , porosity , chemistry , organic chemistry , engineering
The inherently linear polypropylene suffers unsatisfying foaming behavior due to its low melt strength. To overcome this drawback, polypropylene‐/polypropylene‐grafted glycidyl methacrylate/thermoplastic polyester elastomer (PP/PP‐g‐GMA/TPEE) blending foam is prepared by the chemical foaming method in this study. The foaming mechanism of blending was studied from the aspects of the rheological behavior and the crystallization property. The results show that TPEE disperses in the PP matrix with fine particles and forms ideal interfaces, which provide a large number of nucleation sites for the foaming process of blending, inducing heterogeneous nucleation. Both of the 15 wt% and 20 wt% TPEE‐modified PP composites show higher shear viscosity and obvious strain hardening behavior. It has been proved that the cross‐linking network structure formed by TPEE and PP‐g‐GMA reaction improves the melt strength. The cell size decreases from 37.6 to 24.8 μm, and the cell density increases from 2.9 × 10 6 cells/cm 3 to 2.5 × 10 7 cells/cm 3 . Compared with PP composites, the foaming window of the PP/PP‐g‐GMA/TPEE composites was widened.