PETMP {Pentaerythritol Tetra(3-mercaptopropionate), >97%} as Crosslinking Monomer for Gel Polymer Electrolyte, 50-200 g/bottle, CGPECMPETMP

Pentaerythritol Tetra(3-mercaptopropionate) (PETMP) is a high-functionality, tetra-thiol monomer (C17H32O8S4) featuring four reactive thiol (-SH) groups radiating from a central pentaerythritol core. In advanced energy storage research, PETMP is widely recognized as a premier crosslinking agent for Gel Polymer Electrolytes (GPEs) and in situ solidified battery systems via thiol-ene click chemistry, delivering rapid curing kinetics, high elasticity, and exceptional interfacial contact for high-energy lithium and sodium metal batteries.

The main functional roles of PETMP as crosslinking monomer for GPEs are: (1) Rapid Thiol-Ene Network & Liquid Immobilization: When paired with multi-vinyl crosslinkers (e.g., PEGDA or triallyl compounds) in the presence of an initiator, PETMP rapidly forms a robust 3D polymer mesh that permanently traps and immobilizes organic liquid electrolytes. This eliminates free-flowing liquid leakage, converting high-energy liquid cells into safe, dimensionally stable gel systems. (2) Bypassing Oxygen Inhibition for In Situ Pouch Cell Curing: Standard acrylic or methacrylic in situ polymerizations are frequently hindered by trace residual oxygen inside sealed pouch cells, leading to incomplete conversion and sticky residues. Thiol-ene systems involving PETMP are largely immune to oxygen quenching, ensuring complete, uniform crosslinking throughout the entire electrode-separator assembly. (3) Stress Relaxation During Electrode Volume Fluctuations: The flexible thioether bonds and well-controlled network mesh of PETMP-based GPEs provide high elongation and resilience. This enables the electrolyte to dynamically accommodate severe volume expansion and contraction—such as those encountered in silicon anodes or high-capacity lithium metal plating—without delaminating or developing internal micro-cracks.

Part Number	CGPECMPETMP (C-GPE-CM-PETMP)
CAS	7575-23-7
Chemical Formula	(HSCH2CH2COOCH2)4C
Appearance	Colorless to pale-yellow transparent liquid
Purity	>97%
Molecular Weight	488.64 g/mol
Density	1.28 g/mL at 25 °C (lit.)
Boling Point	275 °C/1 mmHg (lit.)
Package Size	50 g, 100 g, and 200 g/bottle

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

References: 

1. B. He, et al. High-efficiency fabrication of gel polymer electrolyte by click chemistry for long-cycling lithium metal batteries, Journal of Power Sources, 2026, 686, 240534 
2. W. Ye, et al. Eutectic Solution Enables Powerful Click Reaction for In-Situ Construction of Advanced Gel Electrolytes, Energy Environmental Materials, 2023, 6, e12579