SMA-3000 Styrene-Maleic Anhydride Copolymer
Key Features
- Reactive anhydride groups for covalent bonding to amine- and OH-functionalized surfaces
- Effective interphase compatibilizer — bridges fiber surface and polymer matrix across the full interphase zone
- Halogen-free, RoHS-compliant — no antimony synergist required
- Dual supply form: solid powder (easy metering in compounding) and solution (direct coating application)
- Alkali-soluble — forms stable aqueous dispersions at pH > 7, enabling waterborne formulations
- 3:1 S:MA ratio offering enhanced hydrophobicity and thermoplastic processing compatibility, suitable for melt-compounding processes
SMA-3000 is a 3:1 S:MA ratio offering enhanced hydrophobicity and thermoplastic processing compatibility, suitable for melt-compounding processes. As a Styrene-Maleic Anhydride (SMA) copolymer with CAS 9011-13-6, it contains reactive anhydride groups that can covalently bond to amine, hydroxyl, and epoxy-functionalized surfaces — making it an effective polymeric coupling agent and reactive compatibilizer for fiber-reinforced composites and polymer alloys.
In composite materials, SMA copolymers serve as interfacial compatibilizers between hydrophilic reinforcements (glass fiber, mineral fillers) and hydrophobic thermoplastic matrices such as PP, PE, ABS, and PA. Unlike silane coupling agents which operate at the fiber surface monolayer, SMA acts as a molecular bridge across the entire interphase zone — improving tensile strength, flexural modulus, and impact retention in fiber-reinforced compounds. Recommended loading is 1–5 wt% on total compound weight.
SMA-3000 is best suited for glass fiber and mineral filler compatibilization in PP/PE/ABS compounding, melt-processable polymer modification. It is insoluble in CCl₄, chloroform, benzene, toluene, and methanol; soluble in THF, 1,4-dioxane, and DMF; and dispersible in alkaline aqueous solutions where it hydrolyzes to the corresponding anionic maleate polymer. Available in solid powder and solution forms. Shelf life: 3 years at room temperature in original sealed packaging.
Specifications
| Parameter | Value |
|---|---|
| Appearance | White solid powder or flake |
| CAS Number | 9011-13-6 |
| Shelf Life | 3 years (RT, sealed) |
| Solubility | THF, dioxane, DMF; alkali-dispersible |
| S:MA Molar Ratio | ~3:1 |
| Packaging (solid) | 20 kg woven bag |
| Acid Value (mgKOH/g) | 285 |
| Packaging (solution) | 200 kg plastic drum |
| Number-Average Molecular Weight (Mn) | 3,800 |
| Weight-Average Molecular Weight (Mw) | 9,500 |
Applications
FAQ
Silane coupling agents work at the fiber surface mono/bilayer, creating a thin chemically-bonded interphase (~5–10 nm). SMA copolymers like SMA-3000 operate differently: they are melt-blended into the polymer matrix at 1–5 wt% loading and migrate to the fiber-matrix interface during processing. The anhydride groups react with amine-sized fibers or amine-functionalized surfaces to create a thick, interpenetrating interphase (~50–100 nm) that provides superior stress transfer for large-displacement loads. In practice, the two are complementary — silane-sized fibers combined with SMA matrix modifier give the best interfacial adhesion.
Direct Contact
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