What is N-Phenylmaleimide CAS 941-69-5?

N-Phenylmaleimide, also called PMI, NPMI, or 1-phenyl-1H-pyrrole-2,5-dione, is a maleimide monomer with the molecular formula C10H7NO2 and molecular weight 173.17 g/mol. Its EC number is 213-382-0, and it is commonly supplied as a yellow crystalline solid for polymer modification and specialty synthesis.

What is N-Phenylmaleimide used for in polymer materials?

It is mainly used as a heat-resistant modifier for ABS, PVC, PMMA, and other thermoplastics. It can also act as a reactive maleimide monomer in copolymers and as a crosslinking or vulcanization modifier in rubber systems, improving rigidity, heat distortion temperature, thermal stability, and chemical resistance.

How does N-Phenylmaleimide improve heat-resistant ABS?

N-Phenylmaleimide introduces rigid imide and phenyl groups into the polymer backbone, increasing chain stiffness and heat resistance. It can be copolymerized with styrene, acrylonitrile, maleic anhydride, or blended as an N-PMI-modified copolymer, allowing formulators to raise HDT while retaining processability.

How is N-Phenylmaleimide synthesized?

A common route is the reaction of maleic anhydride with aniline, first forming the intermediate amic acid and then closing the imide ring through dehydration/imidization. The resulting maleimide monomer can then be copolymerized with other vinyl monomers in solution, emulsion, or bulk polymerization systems.

How should N-Phenylmaleimide be stored and handled?

Store it in a cool, dry, well-ventilated area with containers tightly sealed to prevent moisture pickup and contamination. Avoid contact with strong oxidizing agents and sources of ignition, and follow standard handling practices for reactive polymer intermediates.

N-Phenylmaleimide CAS 941-69-5

N-Phenylmaleimide (PMI) is supplied as a functional maleimide-based intermediate, widely used in polymer chemistry where reactive double bonds and imide structures are required. It is commonly incorporated into resin systems and polymer backbones to improve thermal stability, rigidity, and chemical resistance.

Typical applications include high-performance resins, copolymerization systems, and modification of engineering plastics such as ABS and other thermoplastic materials. It is generally supplied as a crystalline solid suitable for melting, dissolution, or direct reaction in polymer processing. Standard export packaging, bulk supply, and documentation such as COA, TDS, and SDS are available to support industrial use.

CAS: 941-69-5
Synonyms: N-Phenylmaleimide; PMI; 1-Phenyl-1H-pyrrole-2,5-dione
Einecs: 213-382-0
Molecular Formula: C10H7NO2
Grade: Industrial / polymer-grade intermediate
Package: Available in standard moisture-protected packaging for solid materials

Request a quote

Share:

Product Description

1 Physicochemical Properties

2 Typical Applications

3 Packaging

4 Storage

Physicochemical Properties

Item	Typical Value
Appearance	White to light yellow crystalline solid
Odor	Slight characteristic odor
Molecular Weight	173.17 g/mol
Melting Point	Approx. 89–92°C
Solubility	Soluble in organic solvents; limited solubility in water
Reactivity	Contains reactive double bond suitable for polymerization and copolymerization
Thermal Stability	Good thermal stability in polymer systems

Typical Applications

Comonomer in high-performance polymer systems to enhance heat resistance
Modification of engineering plastics such as ABS and related thermoplastics
Component in thermosetting resins and specialty coatings
Intermediate in functional materials requiring maleimide reactivity

For related maleic chemistry pages, compare Maleic Anhydride and Maleic Acid.

Packaging

N-Phenylmaleimide is typically supplied as a solid packed in moisture-resistant bags or fiber drums with inner liners. Packaging is designed to protect the material from moisture and contamination while maintaining stability during storage and transportation. Packaging formats can be arranged according to order volume and handling requirements.

Storage

Store in a cool, dry, and well-ventilated area. Keep containers tightly sealed and protected from moisture and excessive heat. Avoid prolonged exposure to light and elevated temperatures to maintain product stability and reactivity.

FAQ - Technical & Supply Chain

Q:
What is N-Phenylmaleimide CAS 941-69-5?

A: N-Phenylmaleimide, also called PMI, NPMI, or 1-phenyl-1H-pyrrole-2,5-dione, is a maleimide monomer with the molecular formula C10H7NO2 and molecular weight 173.17 g/mol. Its EC number is 213-382-0, and it is commonly supplied as a yellow crystalline solid for polymer modification and specialty synthesis.
Q:
What is N-Phenylmaleimide used for in polymer materials?

A: It is mainly used as a heat-resistant modifier for ABS, PVC, PMMA, and other thermoplastics. It can also act as a reactive maleimide monomer in copolymers and as a crosslinking or vulcanization modifier in rubber systems, improving rigidity, heat distortion temperature, thermal stability, and chemical resistance.
Q:
How does N-Phenylmaleimide improve heat-resistant ABS?

A: N-Phenylmaleimide introduces rigid imide and phenyl groups into the polymer backbone, increasing chain stiffness and heat resistance. It can be copolymerized with styrene, acrylonitrile, maleic anhydride, or blended as an N-PMI-modified copolymer, allowing formulators to raise HDT while retaining processability.
Q:
How is N-Phenylmaleimide synthesized?

A: A common route is the reaction of maleic anhydride with aniline, first forming the intermediate amic acid and then closing the imide ring through dehydration/imidization. The resulting maleimide monomer can then be copolymerized with other vinyl monomers in solution, emulsion, or bulk polymerization systems.
Q:
How should N-Phenylmaleimide be stored and handled?

A: Store it in a cool, dry, well-ventilated area with containers tightly sealed to prevent moisture pickup and contamination. Avoid contact with strong oxidizing agents and sources of ignition, and follow standard handling practices for reactive polymer intermediates.

Ordering & Documentation

Key information for document requests, quotations, and supply planning.

Documents

COA, TDS, SDS/MSDS and packing details are available on request.

Quotation

Send the CAS number, grade, quantity, packing preference and destination.

Sample & Supply

Support is available for samples, trial orders, bulk and repeat supply.

Storage & Shipping

Product-specific conditions are confirmed before order.

Current Language

Change Language