Poly(4-bromostyrene)

Catalog NumberHG-BULK24936503

CAS Number24936-50-3

CategoryPolymers

Molecular Weight

Mw ~5kDa

Appearance

Light yellow powder

Application

Halogen-Free Flame Retardancy: Direct replacement of halogenated flame retardants for electronic device housings and aerospace interior materials, reducing fire hazards.; High-Frequency Electronics: High dielectric performance suitable for 5G circuit boards and flexible display insulation layers, supporting communications and wearable devices.; Functional Coatings: Bromine-based components enhance polar interactions, forming corrosion-resistant coatings on metal or plastic surfaces.

Storage

Keep in a cool, dark, and dry place

Specification

96% min

Download COA Download MSDS

Case Study

Poly(4-bromostyrene) as a Versatile Precursor for Alkyne-Functional Polymers via Sonogashira Coupling

Sessions, Laura B., et al. Macromolecules 40.6 (2007): 1926-1933.

Poly(4-bromostyrene) (PBrS) serves as a well-defined polymer platform for postpolymerization modification via palladium-catalyzed Sonogashira coupling with terminal alkynes. This approach enables the synthesis of alkyne-rich polymers and block copolymers under mild conditions, avoiding the difficulties of direct polymerization of alkyne-functional monomers.
Fabrication Process: PBrS homopolymers (Mn 8-15 kg/mol, Đ ≈1.1) were prepared by nitroxide-mediated polymerization (NMP) with TEMPO/BPO. Coupling reactions used bis(benzonitrile)palladium dichloride, CuI, tri-tert-butylphosphine, and 1.5 equiv of alkyne (phenylacetylene or 1-hexyne) in dioxane at room temperature for up to 96 h. Residual palladium and copper were removed by treatment with tetrakis(hydroxymethyl)phosphonium chloride.
Performance Evaluation: With phenylacetylene, >90% conversion of bromostyrene units was achieved without broadening of molecular weight distribution (Mn ≈10 kg/mol, Đ ≈1.11). 1-Hexyne gave >85% conversion, though addition of BHT was required to suppress crosslinking. The resulting poly(4-phenylethynylstyrene)-co-PBrS showed a glass transition temperature of 162 °C (vs. 130 °C for PBrS). The alkyne groups readily reacted with dicobalt octacarbonyl to form cobalt-carbonyl adducts (≈97% conversion), demonstrating utility as precursors for metal nanoparticles. The coupling also succeeded on a poly(2-vinylpyridine)-b-polystyrene-b-PBrS triblock copolymer in benzene/toluene, giving high conversion.
Conclusion: Poly(4-bromostyrene) enables controlled postpolymerization alkyne functionalization, providing tunable copolymers and metal-containing hybrid materials for diverse applications.

• Molecular Weight: Mw ~5kDa
• Appearance: Light yellow powder
• Application: Halogen-Free Flame Retardancy: Direct replacement of halogenated flame retardants for electronic device housings and aerospace interior materials, reducing fire hazards.; High-Frequency Electronics: High dielectric performance suitable for 5G circuit boards and flexible display insulation layers, supporting communications and wearable devices.; Functional Coatings: Bromine-based components enhance polar interactions, forming corrosion-resistant coatings on metal or plastic surfaces.
• Storage: Keep in a cool, dark, and dry place
• Specification: 96% min