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| Synonyms:Pentaerythritol tetra(3-mercaptopropionate) PETMP Pentaerythritol tetrakis(3-mercaptopropionate) Pentaerythritol tetramercaptopropionate Pentaerythritol tetra-3-mercaptopropionate Molecular Formula: C17H28O8S4 Molecular Weight: 488.66 HS Code: 2930909099 Grade: Industrial grade96% Hazard Class:Class9 | |||||||||
7575-23-7
bosschemical
7575-23-7
Pentaerythritol Tetra (3-mercaptopropionate), abbreviated as PETMP, is a tetrafunctional thiol monomer obtained by esterification of pentaerythritol and 3-mercaptopropionate. Its molecular formula is C17H28O8S4, and its CAS number is 7575-23-7. It is a colorless to pale yellow transparent liquid with a characteristic thiol odor. Its four thiol end groups endow it with extremely high reactivity—it is both a core crosslinking monomer in thiol-ene click chemistry and photocuring systems, and a rapid curing agent for epoxy resins and a chain transfer agent in polymer synthesis. It is widely used in UV coatings, UV inks, photocurable adhesives, 3D printing photosensitive resins, high-refractive-index optical materials, and electronic packaging materials.
Basic information : Chinese name: Pentaerythritol Tetra(3-mercaptopropionate); English name: Pentaerythritol Tetra(3-mercaptopropionate) (abbreviated PETMP, also known as PETP, pentaerythritol tetramercaptopropionate); CAS number: 7575-23-7; Molecular formula: C17H28O8S4; Molecular weight: approximately 488.66; Appearance: colorless to pale yellow transparent liquid; Refractive index: approximately 1.531; Viscosity: approximately 380-480 mPa·s (25℃); Density: approximately 1.28 g/cm³; Easily soluble in common organic solvents such as esters, ketones, and aromatics, sparingly soluble in water; Characteristic thiol odor.
Structurally , PETMP is centered around pentaerythritol, with four hydroxymethyl groups esterified with 3-mercaptopropionic acid to form four -(CH2-O-CO-CH2-CH2-SH) arms, and four thiol groups (-SH) at the molecular ends. Its tetrafunctionality and symmetrical star structure are its structural characteristics: the four equivalent thiol end groups determine its high crosslinking density, low viscosity flowability, and uniform reaction network, which are the molecular basis for its use as a photocurable crosslinking agent and epoxy curing agent.
of physical properties , PETMP is a colorless to pale yellow transparent liquid; its refractive index is about 1.531; its viscosity is about 380-480 mPa·s; its density is about 1.28 g/cm³; it is readily soluble in organic solvents such as esters, ketones, and aromatics, but sparingly soluble in water; it has a characteristic thiol odor; it should be stored in a cool, dark, and sealed place to avoid oxidation and polymerization.
Chemically , PETMP is a tetrafunctional thiol: the thiol group (-SH) can undergo a thiol-alkene click addition reaction with the olefin double bond under light or heat initiation, which is rapid, efficient, and less affected by oxygen inhibition; the thiol group can also undergo a nucleophilic addition reaction with epoxy groups, achieving rapid curing at low temperatures; the thiol group can also form disulfide bonds under oxidative conditions and can form strong coordination with the surfaces of metals such as gold and silver. The tetrafunctionality allows for the formation of multiple connections in each reaction, giving the cured product a high crosslinking density.
Why does Pentaerythritol Tetra (3-mercaptopropionate) play these roles in fields such as photocuring, optical materials, epoxy curing, and polymer synthesis? Its mechanism of action mainly includes the following:
Thiol-olefin click chemistry mechanism : The free radical addition of mercapto groups to olefin double bonds is rapid, has a high conversion rate, is less affected by oxygen inhibition, and has a delayed gel point and low volume shrinkage—the basis for the efficient network formation of photocurable systems.
The four-functional crosslinking mechanism : Each molecule carries four equivalent thiol end groups, forming multiple connections in a single reaction, resulting in high network crosslinking density and good mechanical and solvent resistance properties—the structural basis of crosslinking agents and curing agents.
Thiol-epoxy addition mechanism : Thiol nucleophilic attack on epoxy group ring-opening addition, which can cure rapidly at room temperature and low temperature, and endow the cured product with flexibility and adhesion - the mechanism of action of epoxy resin thiol curing agent.
Chain transfer mechanism : Thiol groups act as efficient chain transfer agents in free radical polymerization, terminating the growing chain and restarting it. They are used to control molecular weight and prepare end-thiol polymers and block copolymers.
Thiol metal coordination mechanism : Thiol groups form strong coordination bonds with the surfaces of metals such as gold and silver, and can self-assemble into ordered monolayers on the metal surfaces—the basis of surface modification and nanoparticle functionalization.
1. Field of photocurable materials
Thiol-olefin photocurable crosslinking agent
As a tetrafunctional thiol crosslinking monomer, it forms a thiol-olefin/thiol-acrylate photocurable system with olefin resin, which exhibits rapid network formation, low shrinkage, and resistance to oxidation and polymerization.
Corresponding products: thiol-olefin photocuring system, PETMP crosslinking monomer, etc.
UV curable coating crosslinking agent
It functions as a crosslinking agent and modifier for UV coatings, improving curing speed and coating performance.
Corresponding products: UV wood coatings, UV plastic coatings, UV metal coatings, etc.
UV-curable ink crosslinking agent
It acts as a crosslinking monomer for UV inks, improving printing curing speed and ink layer adhesion.
Corresponding products: UV offset printing ink, UV flexographic printing ink, UV screen printing ink, etc.
UV-curable adhesives and sealants
It acts as a crosslinking monomer for UV-curable adhesives and sealants, enabling rapid positioning and curing.
Corresponding products: UV adhesives, light-curing sealants, optical bonding adhesives, etc.
3D printing photosensitive resin crosslinking agent
It serves as a crosslinking monomer for photosensitive resins used in photocurable 3D printing, improving molding accuracy and mechanical properties.
Corresponding products: SLA/DLP photosensitive resin, 3D printing resin, etc.
2. Optical and electronic materials
High refractive index optical materials
Sulfur imparts a high refractive index to materials, and PETMP is used in high refractive index optical resin lenses, prisms, optical waveguides, and optical adhesives.
Corresponding products: high refractive index resin lenses, optical adhesives, optical waveguide materials, etc.
Electronic materials
It serves as a crosslinking monomer for photoresists and a curing component for electronic packaging materials, used in semiconductor and LED packaging.
Corresponding products: photoresist, electronic packaging materials, LED packaging adhesive, etc.
3. Epoxy Resin Curing Field
Epoxy Resin Thiol Curing Agent
As a thiol-based curing agent for epoxy resins, it cures rapidly at both room and low temperatures, imparting flexibility and good adhesion to the cured material, making it suitable for rapid repair and potting.
Corresponding products: thiol curing agents, epoxy fast curing agents, epoxy potting compounds, etc.
4. Polymer Synthesis and Functional Materials
polymer synthesis intermediates
It serves as a chain transfer agent and terminal thiol functional monomer in free radical polymerization, used to regulate molecular weight and prepare terminal thiol polymers and block/star copolymers.
Corresponding products: chain transfer agents, terminal thiol polymers, block copolymer raw materials, etc.
Acrylic resin system curing agent
As a multifunctional thiol curing agent for acrylic resin systems, it improves crosslinking density and durability.
Corresponding products: acrylic resin curing agents, thiol-modified acrylic systems, etc.
Surface modification of metals and nanomaterials
Thiol groups strongly coordinate with metals such as gold and silver, and can be used for self-assembly of monolayers on metal surfaces, corrosion protection, and functional modification of gold/silver nanoparticles.
Corresponding products: self-assembled monolayers, metal corrosion inhibitors, functionalized nanoparticles, etc.
Porous framework material ligands
It can be used as a thiol-containing multidentate ligand to construct porous coordination materials such as metal-organic frameworks and covalent organic frameworks.
Corresponding products: MOF ligands, COF ligands, porous functional materials, etc.
Pentaerythritol Tetra (3-mercaptopropionate), PETMP (CAS 7575-23-7), is a tetrafunctional thiol monomer with pentaerythritol as its core and four thiol end groups. These four equivalent thiol groups allow it to react efficiently with olefins and epoxy groups under light or heat initiation. It serves as a high-performance crosslinking monomer for thiol-olefin photocuring systems, a rapid curing agent for epoxy resins, a chain transfer agent in polymer synthesis, and a modifying agent for metal surfaces. It is found in UV-coated furniture and flooring, printed packaging, resin eyeglass lenses, 3D printed products, and electronic potting compounds—quietly supporting the photocuring, optics, electronics, and functional materials industries with its unique tetrafunctional thiol identity. Understanding its thiol end groups and tetrafunctional structure helps explain why it has become a key monomer with multiple functions in modern photocuring and functional materials.
