HEMA {2-Hydroxyethyl methacrylate)} as Monomer for Gel Polymer Electrolytes (GPEs), 100 g/bottle, CGPEMHEMA

2-Hydroxyethyl methacrylate (HEMA) is a highly versatile functional monomer widely investigated for synthesizing gel polymer electrolytes (GPEs) in next-generation batteries (including advanced lithium and sodium-ion systems). Its structure—containing a polymerizable methacrylate group at one end and a hydrophilic, polar hydroxyl group at the other—provides unique chemical and mechanical tuning capabilities.

The chemical formula of HEMA is H2C=C(CH3)CO2CH2CH2OH. When polymerized into poly(HEMA) or copolymerized with other monomers, it introduces two primary functional groups into the polymer backbone: (1) Carbonyl (C=O) and Ester (C-O-C) Groups: The lone pairs on the oxygen atoms provide Lewis-base active sites that coordinate with migrating cations (Li+ or Na+). This helps dissociate the metal salt (e.g., LiTFSI, NaPF6) and facilitates hopping-type ion transport. (2) Terminal Hydroxyl (-OH) Groups: The polar hydroxyl groups significantly enhance the dielectric constant of the polymer matrix. This assists in further salt dissociation and creates a highly hydrophilic/polar network capable of trapping large volumes of organic carbonate or ionic liquid plasticizers without leaking.

One of the most compelling reasons to use HEMA in GPE design is its compatibility with in-situ fabrication. (1) Low Viscosity Injection: The HEMA monomer mixture, along with a liquid electrolyte (salt + solvent) and a radical initiator (thermal or photo), forms an ultra-low viscosity liquid precursor. This liquid can be easily injected into a compiled cell (button cell or pouch cell), ensuring perfect wetting of the porous separator and complete infiltration into the tortuous pores of the cathode and anode. (2) Rapid Curing: Upon exposure to heat (e.g., using AIBN as a thermal initiator) or UV light (e.g., using HMPP or Irgacure series), the C=C double bonds rapidly undergo free-radical addition polymerization. This transforms the liquid into a quasi-solid gel in-situ, establishing an intimate, continuous, and low-resistance interface with the electrodes.

Part Number	CGPEMHEMA (C-GPE-M-HEMA)
CAS	868-77-9
Chemical Formula	CH2=C(CH3)COOCH2CH2OH
Purity	>99%
Molecular Weight	130.14 g/mol
Density	1.073 g/mL at 25 °C (lit.)
Boling Point	67 °C/3.5 mmHg (lit.)
Package Size	100 g/bottle (liquid)

Notes: Please try to store the HEMA monomer in a dry place. 

References: 

1. J. Wang, et al. Flame-Retardant, Highly Conductive, and Low-Temperature-Resistant Organic Gel Electrolyte for High-Performance All-Solid Supercapacitors, ChemSusChem, 2021, 14, 2056-2066
2. H. Qin, et al. Chemically Cross-Linked Poly(2-hydroxyethyl methacrylate)-Supported Deep Eutectic Solvent Gel Electrolytes for Eco-Friendly Supercapacitors, ChemElectroChem, 2017, 4, 2556-2562