Ethyl-1,18-octadecanediamine (mixture of branched chain isomers) TCI E1568

Chemical Identity

Other names: 8-Ethyloctadecane-1,18-diamine (mixture of branched chain isomers) · 8-Ethyl-1,18-octadecanediamine (mixture of branched chain isomers)
CAS No.: 2759148-77-9
Formula: C20H44N2
Molecular weight: 312.59 g/mol
Purity: >95.0%(T)

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Ethyl-1,18-octadecanediamine is a long-chain aliphatic diamine supplied as a mixture of branched chain isomers. Its molecule carries two primary amine groups at the ends of a long carbon chain, a configuration that makes it a valuable bifunctional monomer in polymer chemistry. In the preparation of polyamides, polyureas, and epoxy-based systems, the diamine acts as the component that links other monomer units together into long chains or into three-dimensional networks. The eighteen-carbon chain length makes its own characteristic contribution to the final properties of the material that is formed.

The characteristic that leads researchers to select this material lies in the combination of a long hydrocarbon chain with reactive amine end groups. The long chain contributes hydrophobic character, flexibility, and a wide spacing between crosslink points, so the resulting material tends to be more pliable, more water resistant, and to show a lower glass transition temperature than products made from short-chain diamines. The branched isomer mixture adds a practical advantage as well: branching hinders crystalline packing, so the material is easier to handle and to blend with resins than a strictly linear diamine of comparable length.

In Indonesian laboratories, this monomer is typically used in university and institutional research settings working on polymer synthesis, coatings, and adhesives, as well as in industrial R&D groups developing formulated resin systems. It is normally handled on a bench or small pilot scale, weighed into reaction vessels together with diacids, diisocyanates, or epoxy resins, and studied for the way its chain length and branching modify the mechanical and thermal behaviour of the cured product.

Advantages (TCI brochure)

Suitable as a resin raw material for polyimide, polyamide, polyurethane, etc.
Possible to improve flexibility, curability, water resistance and transparency of synthetic resins based on the long-chain aliphatic branched skeleton

TCI brochures (PDF)

Aliphatic Diamine Monomer with Branched Skeleton 2025-07-24 · p. 1
Raw Materials for Polyimide Synthesis 2026-05-11 · p. 6
Monomers 2025-05-28 · p. 33

Related TCI products

Polyamide synthesis research: the two terminal primary amine groups allow direct condensation with diacids or diesters, while the long chain lowers chain stiffness and produces softer, more flexible polyamide backbones.
Epoxy curing agent studies: the primary amines react with epoxide rings to build crosslinked networks, and the eighteen-carbon spacer gives wide inter-crosslink spacing for toughened, less brittle cured resins.
Polyurea and polyurethane formulation work: reaction of the amine ends with isocyanate functionality forms urea linkages, with the hydrophobic chain improving water resistance in the resulting elastomeric systems.
Structure-property investigations in polymer science: comparing this long-chain branched diamine against short-chain linear analogues reveals how chain length and branching govern glass transition temperature and flexibility.
Coating and adhesive development: the branched isomer mixture resists crystalline packing, so the diamine blends more readily with resin systems during formulation trials than comparable linear long-chain diamines.

From the TCI brochure

Resin raw material for polyimide, polyamide, polyurethane, etc.

Brand	TCI
CAS number	2759148-77-9
Molecular formula	—
Purity	—
Category	Materials Science > Polymer/Macromolecule Reagents > Monomers
Pack sizes	available in standard TCI research pack sizes; please confirm the packaging option required
Physical form	—
Storage	keep in a cool, dry place in a tightly closed container, following the storage instructions on the manufacturer's label

Product code: E1568
Composition: mixture of branched chain isomers

Data from the TCI brochure

Komposisi	Komponen mayor: branched ethyl-1,18-octadecanediamine; komponen minor: senyawa diamina alifatik dengan struktur rantai alkil bercabang berbeda; tidak mengandung komponen rantai lurus

Source: TCI brochure FF211 (2025-07-24)

Store the container tightly closed in a cool, dry, well-ventilated area away from heat sources and away from incompatible materials such as strong acids and oxidising agents. Aliphatic amines readily absorb carbon dioxide and moisture from the air, so containers should be resealed promptly after use and, where practical, kept under an inert atmosphere. Handle in a fume hood using chemical-resistant gloves, safety goggles, and a laboratory coat, since primary amines are irritating to the skin, eyes, and respiratory tract. Use compatible glass or chemically resistant plastic containers for transfer and weighing, keep the workspace clean, and consult the manufacturer's safety data sheet before use and before disposal of residues.

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