Molecular Mobility and Higher-Order Structural Analysis of Polyoxymethylene under Heating and Fuel Swelling

NAGAO Tatsuhiko, YAGI Atsushi, KANDA Yuhki, KAWAGUCHI Kuniaki

doi:10.2116/bunsekikagaku.71.511

<p>Polyoxymethylene (POM) is a typical crystalline engineering plastic that is widely used in automotive fuel system components because of its excellent fuel resistance. It is known that direct contact between fuel and POM causes POM to absorb fuel and swell, thereby affecting its mechanical properties in such applications. It has also been found that the mechanical properties of POM are affected by an environmental temperature. From these situations, it is important for designing the products to investigate the effects of temperature and fuel swelling on the molecular mobility and higher-order structure of POM. In this study, the molecular mobility and higher-order structural changes of POM under heating and fuel swelling were analyzed using solid-state NMR, wide-angle X-ray diffraction (WAXD), and small-angle X-ray scattering (SAXS). Solid-state NMR measurements showed that the molecular mobility of all regions including crystalline to amorphous phases was enhanced under heating, while selective enhancement of molecular mobility was observed only in the amorphous and intermediate phases under fuel swelling. The results of solid-state NMR, WAXD, and SAXS measurements also confirmed that higher-order structural changes, such as increased crystallinity and increased volume of amorphous portions which occurred simultaneously due to fuel swelling.</p>

Molecular Mobility and Higher-Order Structural Analysis of Polyoxymethylene under Heating and Fuel Swelling

Bibliographic Information

Description

Journal

References(10)*help

Keywords

Details 詳細情報について

Export

Report a problem