Characterization of volume strain of poly(vinylidene fluoride) under creep test
Citations Over Time
Abstract
Abstract Poly(vinylidene fluoride) (PVDF) was subjected to a creep test performed at constant true stress. The use of an original method to control and adjust, in real time, the stress allowed the assessment of volume changes occurring during the test. The adaptation of Bucknall's model enabled us to excerpt the component related to microstructural modifications from the whole volume strain. Mechanisms inducing volume strain are temperature dependent. Above −40 °C and below 80 °C, that is, in between both glass transitions of PVDF, a linear increase of volume strain was observed as a result of polymer damage via the crazing phenomenon. In addition, this region is characterized by the presence of two distinct domains that could be attributed to either nucleation and propagation of voids or to an increase of the number of potential sites for nucleation resulting from microstructural modifications taking place during the test. On the contrary, above the secondary glass transition, a regular decrease of volume strain was observed. It was assigned to a material densification as a result of molecular orientation of the amorphous chain segments. © 2002 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 40: 1754–1759, 2002
Related Papers
- → Crazing mechanisms and craze healing in glassy polymers(1989)24 cited
- → Crazing and fracture of glassy plastics(1973)26 cited
- → Crazing mechanisms and craze healing in glassy polymers(1989)15 cited
- → The effect of cross-linking on crazing in polyethersulphone(1991)5 cited
- → Stress-Crazing of Plastics(1953)10 cited