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CO 2 ‐Induced Mechanical Reinforcement of Polyolefin‐Based Nanocellular Foams
Author(s) -
Sharudin Rahida Wati Binti,
Ohshima Masahiro
Publication year - 2011
Publication title -
macromolecular materials and engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.913
H-Index - 96
eISSN - 1439-2054
pISSN - 1438-7492
DOI - 10.1002/mame.201100085
Subject(s) - materials science , polyolefin , crystallization , sorption , composite material , copolymer , yield (engineering) , polymer , chemical engineering , adsorption , organic chemistry , chemistry , layer (electronics) , engineering
The effect of CO 2 ‐induced crystallization on the mechanical properties, in particular the yield and the ultimate stresses, of polyolefins is studied. PP and SEBS copolymer blends are used as examples and foamed after sorption of CO 2 at temperatures below T m . CO 2 sorption thickens the crystalline lamellae and consequently increases T m from 160 to 178 °C for both pure PP and PP/SEBS blend systems. Foams with an average cell size smaller than 250 nm retain the ultimate stress at the level of the polymer before foaming, even without the effect of CO 2 ‐induced crystallization. Including CO 2 ‐induced crystallization, the yield and the ultimate stresses of the foam can be improved by 30 and 50% over solid PP and by 22 and 40%, for solid PP/SEBS blends, respectively.