Industrial Products

AMSD Molecular Weight Modifier (CTA)

Next-generation chain transfer agent for free-radical polymerization

FOR YOUR

DREAM

AMSD (alpha-Methylstyrene dimer) is a next-generation chain transfer agent (CTA) used in free-radical polymerization. It is an eco-friendly, high-performance product that precisely controls polymer chain length during polymerization and stabilizes molecular weight distribution.

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Product Overview

  • Core mechanism: unlike simple chain terminators, AMSD reacts with active radicals to temporarily stop chain growth while simultaneously generating new radicals (re-initiation), enabling continuous control without slowing the polymerization rate.

AMSD vs. Mercaptan

  • Eco-friendly and sulfur-free: contains no sulfur (-SH), so there is no unpleasant odor in the workplace and no residue.
  • High-temperature capability (100°C+): overcomes the limitation of conventional mercaptans, which decompose above 80°C, maintaining excellent chain-transfer efficiency in high-temperature processes.
  • Quality stabilization and precise control: achieves a narrow molecular weight distribution (PDI 1.5-2.0), minimizing batch-to-batch variation and delivering uniform properties.

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Specification

Item Details
Chemical name / CAS No. alpha-Methylstyrene dimer / 6362-80-7
Formula / M.W. C18H20 / 236.36
Purity ≥98%
Appearance / Solubility Colorless transparent liquid / soluble in most organic solvents

AMSD vs. Mercaptan Comparison

Item AMSD Mercaptan
Eco-friendliness ◎ △
Ease of use ◎ △
Transparency ◯ △
Control efficiency ◎ ◎
Cost ◯ ◯
AMSD vs Mercaptan comparison radar chart

Applications

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