General Properties
Short Name:
Name:
UP
Unsaturated Polyester Resin
Unsaturated polyester resins (UP) are reaction resins with double bonds in the macromolecular backbone. These are a pre-requisite for copolymerization reactions without separation of reaction products. It is therefore possible to employ aluminum crucibles with pierced lids for their DSC investigation – just like for epoxy resins. Unsaturated polyester resins are available as cast resins, molding compounds or prepregs.
Structural Formula
Properties
| Glass Transition Temperature | 60 to 170°C |
|---|---|
| Melting Temperature | - |
| Melting Enthalpy | - |
| Decomposition Temperature | 340 to 350 / 470 to 490°C |
| Young's Modulus | 14000 to 20000 MPa |
| Coefficient of Linear Thermal Expansion | 20 to 40 *10-6/K |
| Specific Heat Capacity | 1.26 to 2.30 J/(g*K) |
| Thermal Conductivity | 0.3 to 0.7 W/(m*K) |
| Density | 1.17 to 1.26 g/cm³ |
| Morphology | Thermoset |
| General properties | High strength and stiffness. High toughness. Good chemical resistance. Good electrical insulating properties |
| Processing | Compression, injection molding, casting, in the cured state: machining |
| Applications | Embedding of electronic components. Vehicle construction. Boat building (laminates). Building industry (e.g., dome lights). Electrical engineering. Reaction paints, adhesives |
NETZSCH Measurement
| Instrument | DSC 204 F1 Phoenix® |
| Sample Mass | 15.63 mg |
| Isothermal Phase | 8 min |
| Heating/Colling Rates | 20 K/min |
| Crucible | Al, pierced lid |
| Atmosphere | N2 (40 ml/min) |
Evaluation
The DSC curve shown above indicates a glass transition (midpoint 66°C) in the 1st heating, followed by two small overlapping peaks (attributable to the melting of additives) and post-curing with a peak temperature of 191°C and a reaction enthalpy of approx. 4 J/g.