Unsaturated polyester resin has a relative density ranging from approximately 1.11 to 1.20, and it exhibits significant volume shrinkage during the curing process. Once cured, the resin demonstrates several notable physical properties:
1. Heat Resistance: Most unsaturated polyester resins have a heat distortion temperature between 50°C and 60°C. However, certain types with enhanced thermal stability can withstand temperatures up to 120°C. The linear thermal expansion coefficient (α1) typically falls within the range of (130 to 150) × 10â»â¶/°C.
2. Mechanical Properties: These resins exhibit excellent mechanical strength, including high tensile, flexural, and compressive strength, making them suitable for structural applications.
3. Chemical Resistance: They show good resistance to water, dilute acids, and dilute bases. However, their resistance to organic solvents is relatively poor. The chemical resistance can vary significantly depending on the resin's molecular structure and the type of cross-linking used in its formulation.
4. Dielectric Properties: Unsaturated polyester resins possess favorable dielectric properties, which make them useful in electrical insulation applications.
In summary, unsaturated polyester resins are versatile materials with a wide range of applications, particularly where moderate heat resistance, good mechanical strength, and acceptable chemical resistance are required. Their performance characteristics can be tailored by modifying the chemical composition and curing conditions.
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