General Properties
Short Name:
Name:
Chemical Formula:
EVA
Ethylene Vinyl Acetate
(C2H4)n(C4H6O2)m
The properties and applications of polyethylene vinyl acetate (EVA) vary with the percentage of copolymerized vinyl acetate (VA). The VA amount of the present sample amounts to approx. 19 to 20%.
Structural Formula
Properties
| Glass Transition Temperature | -40 to +20°C |
|---|---|
| Melting Temperature | 30 to 110°C |
| Melting Enthalpy | 10 to 100 J/g |
| Decomposition Temperature | 345 to 360 / 470 to 480°C |
| Young's Modulus | 7 to 120 MPa |
| Coefficient of Linear Thermal Expansion | 160 to 200 *10-6/K |
| Specific Heat Capacity | 2.3 J/(g*K) |
| Thermal Conductivity | 0.35 W/(m*K) |
| Density | 0.92 to 0.95 g/cm³ |
| Morphology | Semi-crystalline thermoplastic |
| General properties | High flexibility and toughness, good aging stability, high weather resistance, high gloss. |
| Processing | Injection moulding |
| Applications | Textile industry, hot melt adhesive, photovoltaic (embedding agent), agriculture and horticulture (films), cling films, shrink wrappings, shoe soles (VA-amount > 30 %) |
NETZSCH Measurement
| Instrument | DSC 204 F1 Phoenix® |
| Sample Mass | 10.65 mg |
| Isothermal Phase | 8 min |
| Heating/Colling Rates | 10 K/min |
| Crucible | Al, pierced lid |
| Atmosphere | N2 (50 ml/min) |
Evaluation
In the above graphics, only the 1st heating (blue) was evaluated since the effects in the 2nd heating − after controlled cooling – are no longer resolved. In the 1st heating (blue curve), the glass transition occurs at -23°C (midpoint, with a change in specific heat of 0.56 J/(g·K)). It is followed by two overlapping, endothermal melting effects at 51°C and 87°C (peak temperatures). The entire heat of fusion of the combined peaks amounts to approx. 75 J/g.