High-Temperature Tensile and Creep Properties of Highly Strong Heat-Elongated Polypropylene
Karin Onaka, Hiromu Saito
TL;DR
This study shows that heat-elongated polypropylene retains high strength and creep resistance at high temperatures, even after long-term annealing.
Contribution
The paper reveals the unique deformation mechanisms behind the high-temperature performance of heat-elongated polypropylene.
Findings
Elongated PP showed 102 MPa yield stress at 120 °C after long annealing, much higher than unelongated PP.
Crystalline fibrils suppressed chain motion, leading to excellent creep resistance despite thermal deterioration.
Fragmentation of lamellae was observed in elongated PP but suppressed in long-annealed samples.
Abstract
We investigated the high-temperature tensile and creep properties of highly strong heat-elongated polypropylene (elongated PP) before and after long annealing for 21 days at a high temperature of 120 °C. Despite the thermal deterioration caused by the long annealing, the elongated PP exhibited high tensile strength. The yield stress values of the elongated and long-annealed (LA)-elongated PP obtained from engineering stress–strain curves were 60 MPa and 102 MPa, respectively, at 120 °C, whereas that of the unelongated PP was 8 MPa. Due to the suppression of crystalline chain motion at high temperature caused by the presence of crystalline fibrils connected to lamellae, as indicated by the high elastic modulus observed using a dynamic mechanical analyzer, the elongated PP also exhibited excellent high-temperature creep properties despite thermal deterioration. Small-angle X-ray…
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Taxonomy
TopicsPolymer crystallization and properties · Polymer Nanocomposites and Properties · Thermal properties of materials