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HMPP (2-Hydroxy-2-methylpropiophenone, >99%) as Photoinitiator for Solid-State & Gel Polymer Electrolyte, 100 g/bottle, CSSGPEPIHMPP
  • HMPP (2-Hydroxy-2-methylpropiophenone, >99%) as Photoinitiator for Solid-State & Gel Polymer Electrolyte, 100 g/bottle, CSSGPEPIHMPP
  • HMPP (2-Hydroxy-2-methylpropiophenone, >99%) as Photoinitiator for Solid-State & Gel Polymer Electrolyte, 100 g/bottle, CSSGPEPIHMPP
HMPP (2-Hydroxy-2-methylpropiophenone, >99%) as Photoinitiator for Solid-State & Gel Polymer Electrolyte, 100 g/bottle, CSSGPEPIHMPP

HMPP (2-Hydroxy-2-methylpropiophenone, >99%) as Photoinitiator for Solid-State & Gel Polymer Electrolyte, 100 g/bottle, CSSGPEPIHMPP

$79.00 USD
In Stock SKU: CSSGPEPIHMPP
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2-Hydroxy-2-methylpropiophenone (HMPP) (commonly known under trade names like Darocur 1173) is a highly efficient Norrish Type I radical photoinitiator widely used for fabricating UV-cured gel polymer electrolytes (GPEs) in next-generation battery applications. Its primary advantage is its liquid state at room temperature, which allows it to mix effortlessly into liquid electrolyte/monomer precursors without requiring additional volatile co-solvents. 

When exposed to UV radiation (typically absorbing strongly in the 230–340 nm range), HMPP undergoes homolytic cleavage (Norrish Type I reaction) at the a-carbon adjacent to the carbonyl group.

Both Benzoyl and Ketyl Radicals resulting fragments act as highly reactive initiating radicals. These radicals attack the carbon-carbon double bonds of vinyl or acrylate-based monomers (e.g., PEGDA, ETPTA, DPHA) dissolved within the liquid electrolyte matrix, triggering a rapid, exothermic free-radical crosslinking network that traps the liquid electrolyte into a 3D gel framework.

The advantages of the HMPP photoinitiator for GPEs: (1) Excellent Solvency: Being a liquid, HMPP dissolves seamlessly into polar carbonate solvents (EC, DEC, DMC) and ether-based glymes, avoiding the micro-segregation or undissolved particle defects often seen with solid initiators like Irgacure 2959 or BAPO. (2) Rapid Kinetics (In Situ Viability): UV curing via HMPP typically takes anywhere from 5 seconds to 2 minutes under moderate intensity lamps (~ 20–100 mW/cm2), making it highly practical for roll-to-roll (R2R) slot-die processing or in situ curing directly inside a sealed pouch cell or coin cell assembly before complete sealing. (3) Low Volatility: High boiling point (~ 102-103 degress at 4 mmHg) ensures minimal vapor pressure during handling in dry rooms or Ar-filled gloveboxes.

Part Number

CSSGPEPIHMPP (C-SSGPE-PI-HMPP)
CAS

7473-98-5
Chemical Formula

C6H5COC(CH3)2OH
Appearance

Colorless Liquid
Molecular Weight

164.20
Boling Point

102-103 °C/4 mmHg (lit.)
Density

1.077 g/mL at 25 °C (lit.)
Package Size 100 g/bottle

 

Notes: Please try to store the HMPP in a dry and dark side.

References: 

  1. F. U. Cengiz, et al. Advanced Flexible and Porous Gel Polymer Electrolytes Based on a Photocrosslinked Thiol-Ene/Hydroxyethyl Cellulose Semi-Interpenetrating Polymer Network for Lithium-Ion Batteries, Macromolecular Materials and Engineering, 2025, 310, e00214
  2. Y. Gu, et al. A non-flammable, flexible and UV-cured gel polymer electrolyte with crosslinked polymer network for dendrite-suppressing lithium metal batteries, Ionics, 2022, 28, 3743–3759

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