Abstract
We reported herein the damp-heat aging of ethylene-vinyl acetate copolymers (EVA) with different vinyl acetate (VAc) contents simultaneously for weeks. The aging was carried out under temperature of 40°C and relative humidity of 93% in air atmosphere. The changes of copolymers structures and properties were investigated by means of FTIR, wide angle X-ray diffraction (WAXD) and differential scanning calorimetry (DSC) and mechanical tests. CI values derived from ATR-FTIR spectra have a decrease when aging time is 1 week and then increase during damp-heat aging process which suggests the first loss then incorporation of 0=C group. WAXD infer that the narrowing trend of FWHM and increase of crystal sizes may attribute to the melting and re-crystallization of secondary crystallization, which is also confirmed by DSC results. Mechanical tests including Shore A and Shore D hardness, modulus at 100%, tensile strength and elongation at break, are all depending on the primary crystallization and influenced little by damp-heat aging.
| Original language | English |
|---|---|
| Pages (from-to) | 2358-2365 |
| Number of pages | 8 |
| Journal | Journal of Applied Polymer Science |
| Volume | 112 |
| Issue number | 4 |
| DOIs | |
| State | Published - 15 May 2009 |
Keywords
- Crystallization
- Damp-heat aging
- Mechanical properties
- Structure