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What is N,N’-1,3-Phenylene bismaleimide? How does it work? What are all its uses?
1.What is N,N’-1,3-Phenylene bismaleimide? How does it work?
N,N’-1,3-Phenylene bismaleimide, also known as meta-phenylene bismaleimide, is a bifunctional compound with two maleimide rings bridged by a meta-phenylene group. Its chemical formula is C14H8N2O4, and its CAS number is 3006-93-7. It is a yellow to yellowish-brown crystalline powder. Its two symmetrical, electron-deficient double bonds allow it to efficiently co-crosslink with rubber peroxide systems and also to self-polymerize at high temperatures to form a heat-resistant resin network. The rigid aromatic ring skeleton endows the product with excellent heat resistance—making it suitable for applications ranging from rubber vulcanizing aids and heat-resistant plastic modifications to high-temperature resins, composite materials, and electronic substrates, as well as laboratory research reagents, spanning multiple industrial and scientific fields.
Basic information : Chinese name: N,N’-1,3-Phenylene bismaleimide (also known as N,N’-1,3-Phenylidene bismaleimide, 1,3-phenylene dimaleimide); English name: N,N’-1,3-Phenylene bismaleimide (abbreviation BMI); CAS number: 3006-93-7; Molecular formula: C14H8N2O4; Molecular weight: 268.23; Appearance: yellow to yellowish-brown crystalline powder; Insoluble in water, soluble in organic solvents such as acetone, dimethylformamide, and xylene; Melting point: approximately 200℃; Synonyms: Antioxidant PM, sulfurizing agent PM, HVA-2, VANAX MBM, etc.
Structurally , m-phenylenebismaleimide consists of two maleimide rings (2,5-pyrroledione) bridged by meta-(1,3) phenylene groups: each maleimide ring contains a carbon-carbon double bond conjugated with two carbonyl groups and an imine nitrogen atom, with the nitrogen atoms of the two rings attached to the 1 and 3 positions of the benzene ring, respectively. The molecule exhibits a rigid symmetrical framework containing two equivalent reactive double bonds—this symmetry and bifunctional structure enable it to function as both a crosslinking bridging molecule and a heat-resistant polymer monomer, which is the structural basis for its versatility across multiple fields.
physical properties , m-phenylenebismaleimide is a yellow to yellowish-brown crystalline powder with no special odor; it is insoluble in water but soluble in organic solvents such as acetone, dimethylformamide, and xylene; its melting point is about 200℃; it is chemically stable at room temperature and needs to be stored in a sealed container away from light and moisture; as a powder additive, it has good dispersibility and is easy to add to rubber and resin formulations.
Chemically , m-phenylenebismaleimide is a bifunctional maleimide: its two electron-deficient carbon-carbon double bonds are highly reactive, capable of Michael addition with amines, and can participate in free radical polymerization, thermal polymerization, and Diels-Alder reaction; it acts as a co-crosslinking agent in rubber peroxide vulcanization systems to increase crosslinking density; it self-polymerizes at high temperatures to form a heat-resistant crosslinking network; the maleimide ring can be hydrolyzed and opened under strong alkali or prolonged high-temperature conditions; its overall chemical properties are stable, and it belongs to the category of heat-resistant organic intermediates.
Why does N,N’-1,3-Phenylene bismaleimide play these roles in so many fields such as rubber, plastics, composite materials, electronic materials, and scientific research? Its mechanism of action mainly includes the following:
Bifunctional polymerization mechanism : Two symmetrical maleimide double bonds enable molecules to both attach to polymer chains and crosslink in multiple directions, and the network topology can be adjusted—the common basis of thermosetting resins and rubber vulcanization systems.
The chemical mechanism of electron-deficient olefins : The carbon-carbon double bond is conjugated with two carbonyl groups and is in an electron-deficient state, which determines that it can take multiple reaction pathways such as Michael addition, free radical polymerization and Diels-Alder reaction – this is the chemical root of its multiple uses.
Rigid heat-resistant skeleton mechanism : The rigid skeleton is composed of m-phenylene aromatic ring and five-membered imide ring. After cross-linking, the movement of network chain segments is restricted and the glass transition temperature is high – the structural source of heat resistance.
Symmetrical molecular engineering mechanism : High molecular symmetry and uniform bifunctionality endow materials with uniform cross-linking and designable properties—a universal design basis from rubber to resin to composite materials.
The mechanism of adjustable reaction conditions : the same double bond can be mildly and efficiently co-vulcanized in the peroxide system, or it can self-polymerize at high temperature without a catalyst – the reason why the same molecule covers both rubber and resin systems.
1.All uses of N,N’-1,3-Phenylene bismaleimide
2.Rubber industry
Peroxide vulcanization co-crosslinking agent
It is used in combination with peroxides as a rubber co-crosslinking agent to increase crosslinking density and improve heat resistance and compression set.
Corresponding products: Rubber products such as EPDM, nitrile rubber, hydrogenated nitrile rubber, and chlorinated polyethylene.
Heat-resistant rubber products
Used for seals, hoses, and transmission components in high-temperature environments, extending their service life.
Corresponding products: heat-resistant sealing rings, high-temperature hoses, transmission belts, etc.
2.Plastics Modification Field
Heat-resistant modification of ABS and AS resins
It can be used as a heat-resistant modifier to increase the heat distortion temperature of resins such as ABS and AS, thereby improving their heat resistance.
Corresponding products: heat-resistant ABS, appliance housings, automotive interior parts, etc.
Heat-resistant modification of PVC and polypropylene
Improve the heat resistance and rigidity of plastics such as PVC and polypropylene, and expand the application temperature range.
Corresponding products: heat-resistant PVC products, modified polypropylene, etc.
3.High-temperature resistant resins and composite materials
BMI high-temperature resistant resin matrix
Bismaleimide resin has a high glass transition temperature and excellent heat resistance, making it suitable as a matrix for high-performance composite materials.
Corresponding products: BMI resin, prepreg, composite material components, etc.
Copper clad laminate and circuit board substrate
It is used as a substrate resin for copper-clad laminates and in high-performance printed circuit boards.
Corresponding products: copper clad laminates, PCB substrates, electronic substrates, etc.
Fiber reinforced composite materials
Combined with glass fiber and carbon fiber, high-temperature resistant structural materials are prepared.
Corresponding products: carbon fiber composite materials, fiberglass components, etc.
4.Adhesives and Electronic Insulation Materials
High-temperature resistant adhesives
It is used as a component of high-temperature resistant adhesives for structural bonding in high-temperature environments.
Corresponding products: high-temperature resistant adhesives, structural adhesives, etc.
Electrical insulation materials
Used in heat-resistant insulating varnishes and electrical insulation components to ensure the temperature resistance and reliability of electrical equipment.
Corresponding products: insulating varnish, heat-resistant insulating parts, etc.
Electronic packaging materials
It is used as a component of electronic packaging materials for the packaging and protection of electronic devices.
Corresponding products: electronic packaging materials, packaging resins, etc.
5.Scientific Research and Reagents
Laboratory Synthetic Reagents
Commonly used synthetic reagents for research on heat-resistant polymers, imides, and composite materials.
Corresponding products: laboratory synthesis reagents, imide monomers, etc.
Resin and Materials Research Raw Materials
Research raw materials used for the formulation of bismaleimide resins and the development of high-performance materials.
Corresponding products: BMI resin research raw materials, material development reagents, etc.
III . Summary
N,N’-1,3-Phenylene bismaleimide (CAS 3006-93-7) is a bifunctional compound consisting of two maleimide rings bridged by meta-phenylene groups. Its symmetrical bismaleimide structure allows for efficient co-crosslinking in rubber peroxide systems and self-polymerization at high temperatures to form a high-temperature resistant network. The rigid aromatic ring skeleton ensures heat resistance at every network node. In rubber factories, it makes seals more heat-resistant; in plastic modification, it makes appliance casings more temperature-resistant; in composite materials and copper-clad laminates, it constructs high-temperature resistant matrices; in insulating varnishes and encapsulation materials, it safeguards electrical reliability; and in laboratories, it supports research in heat-resistant polymers—quietly supporting the rubber, plastics, electronics, composite materials, and scientific research industries in its dual role as an industrial additive and resin monomer. Understanding its bismaleimide structure and double-bond reactivity explains why it has become a key monomer in the world of heat-resistant polymers.
