What is the Difference Between POM-H and POM-C?
🆚 Go to Comparative Table 🆚POM-H and POM-C are both types of polyoxymethylene (POM), a high molecular weight thermoplastic polymer widely used in various industrial applications. The main differences between POM-H and POM-C are:
- Crystallinity and structure: POM-H is a homopolymer, produced by anionic polymerization of formaldehyde, resulting in higher crystallinity and better physical and mechanical properties compared to POM-C. POM-C is a copolymer, produced by cationic polymerization of trioxane, with lower crystallinity.
- Density, hardness, and strength: POM-H has a slightly higher density, hardness, and strength than POM-C due to its higher crystallinity.
- Chemical resistance and melting point: POM-C has higher chemical resistance and a lower melting point than POM-H.
- Processability: POM-C has better processability and lower workability than POM-H.
- Applications: POM-H is best suited for applications where properties like good abrasion resistance and low friction are required, while POM-C is ideal for applications requiring properties such as a low coefficient of friction.
In summary, POM-H has better mechanical and physical properties, while POM-C offers higher chemical resistance and lower melting point. The choice between POM-H and POM-C depends on the specific requirements of the application.
Comparative Table: POM-H vs POM-C
POM-H and POM-C are both thermoplastics, but they have different properties and applications. Here is a table comparing their key differences:
Property | POM-H (Homopolymer) | POM-C (Copolymer) |
---|---|---|
Full Name | POM Homopolymer | POM Copolymer |
Produced by | Anionic polymerization of formaldehyde | Copolymerization of trioxane and a small amount of dioxolane |
Hardness and Stiffness | Hard and stiff | Not as hard and stiff as POM-H |
Processability | Low | High |
Melting Point | 172-184 °C | 160-175 °C |
Processing Temperature | 194-244°C | 172-205°C |
Elastic Modulus (MPa) | 4623 | - |
Applications | Good abrasion resistance, low coefficient of friction | Low coefficient of friction |
POM-H is produced by anionic polymerization of formaldehyde, resulting in high stiffness and strength, while POM-C is produced by copolymerization of trioxane and a small amount of dioxolane. POM-H has better physical and mechanical properties than POM-C, making it suitable for applications requiring good abrasion resistance and low coefficient of friction. In contrast, POM-C is ideal for applications needing low coefficient of friction due to its high processability.
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