Abstract
The weight and dimensional changes of injection molded glass-fiber reinforced polyamide 66 composites based on two glass fiber products with different
sizing formulations and unreinforced polymer samples have been characterized during conditioning in water, ethylene glycol, and a water-glycol mixture at 508C and 708C for a range of times up to 900 h. The results reveal that hydrothermal ageing in these fluids causes significant changes in the weight and dimensions of these materials. All conditioned materials showed a time dependent weight and dimension increase. The change observed in water could be well modeled by a simple Fickian diffusion process; however, the absorption
process followed a more complex pattern in the other conditioning fluids. It was not apparent that changing the glass fiber sizing affected the dimensional
stability of the composites under these relatively mild conditions. There was a strong correlation between the swelling of these samples and the level of fluid absorption. The composites exhibited highly aniosotropic levels of swelling. These effects were well in line with the influence of fibers on restriction of the
matrix deformation in the fiber direction. The polymer and composite swelling coefficients correlated well with data previously obtained at higher conditioning
temperatures.
sizing formulations and unreinforced polymer samples have been characterized during conditioning in water, ethylene glycol, and a water-glycol mixture at 508C and 708C for a range of times up to 900 h. The results reveal that hydrothermal ageing in these fluids causes significant changes in the weight and dimensions of these materials. All conditioned materials showed a time dependent weight and dimension increase. The change observed in water could be well modeled by a simple Fickian diffusion process; however, the absorption
process followed a more complex pattern in the other conditioning fluids. It was not apparent that changing the glass fiber sizing affected the dimensional
stability of the composites under these relatively mild conditions. There was a strong correlation between the swelling of these samples and the level of fluid absorption. The composites exhibited highly aniosotropic levels of swelling. These effects were well in line with the influence of fibers on restriction of the
matrix deformation in the fiber direction. The polymer and composite swelling coefficients correlated well with data previously obtained at higher conditioning
temperatures.
| Original language | English |
|---|---|
| Pages (from-to) | 639-647 |
| Number of pages | 9 |
| Journal | Polymer Composites |
| Volume | 32 |
| Issue number | 4 |
| DOIs | |
| Publication status | Published - Apr 2011 |
Keywords
- polymer
- polyamide 66
- glass fibre
- chemistry