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Polyethylene glycol diacrylate reactive diluent

Release time:

2024-09-06 17:27

Polyethylene glycol diacrylate reactive diluent
Polyethylene glycol diacrylate reactive diluent

I. Introduction

Polyethylene glycol diacrylate (abbreviated as PEGDA) is a bifunctional acrylate reactive diluent. It is composed of ethylene glycol units linked to acrylate groups via ester bonds, forming either linear or branched polymer structures. Each molecule of PEGDA contains two acrylate groups, both of which are reactive functional groups capable of participating in chemical reactions. Due to the presence of two reactive acrylate groups, PEGDA can undergo crosslinking reactions simultaneously with multiple molecules during the curing process, thereby forming a stable network structure.

II. Solubility

Polyethylene glycol (PEG) is a polymer with excellent water solubility. PEGDA, which is obtained by introducing acrylate groups into PEG, also retains good solubility, particularly in water and a variety of organic solvents. This outstanding solubility makes PEGDA an ideal component for solvent-based or aqueous systems, facilitating its processing and application.

Polyethylene glycol diacrylate exhibits excellent solubility, reactivity, and biocompatibility. Its crosslinking density and solubility can be controlled by adjusting the molecular weight and crosslinking conditions, thereby meeting the requirements of various application fields.

III. Derivatives

Among these, by adjusting the molecular weight of polyethylene glycol diacrylate, several derivatives of polyethylene glycol diacrylate were produced: polyethylene glycol (200) diacrylate, polyethylene glycol (400) diacrylate, and polyethylene glycol (600) diacrylate. These correspond to diacrylates with average molecular weights of 200, 400, and 600, respectively, for polyethylene glycol.

The main structural difference among polyethylene glycol (200) diacrylate, polyethylene glycol (400) diacrylate, and polyethylene glycol (600) diacrylate lies in the length of the polyethylene glycol chain segment—that is, the number of repeating ethylene glycol units (n value) differs among them.

1. Polyethylene glycol (200) diacrylate

The average molecular weight of the polyethylene glycol portion is approximately 200, indicating a relatively small number of repeating ethylene glycol units (n). Each end of its molecule is linked to an acrylate group, forming a bifunctional compound. PEG(200)DA appears as a colorless or pale yellow transparent liquid. Due to its relatively low molecular weight, PEG(200)DA exhibits good fluidity and low viscosity.

2. Polyethylene glycol (400) diacrylate

The average molecular weight of the polyethylene glycol (PEG) segment is approximately 400, and the number of repeating ethylene glycol units (n) is greater than that in PEG (200) DA. Similarly, each end of the molecule is linked to an acrylate group, preserving its bifunctional character. PEG (400) DA appears as a transparent liquid; compared to PEG (200) DA, it has a higher molecular weight, better film-forming properties, and a higher cross-linking density.

3. Polyethylene glycol (600) diacrylate

The average molecular weight of the polyethylene glycol (PEG) segment is approximately 600, and the number of repeating ethylene glycol units (n) is the highest. Like the two preceding compounds, each end of the molecule is also linked to an acrylate group. PEG(600)DA appears as a transparent liquid. Due to its higher molecular weight, PEG(600)DA exhibits greater viscosity and superior film-forming properties. Moreover, the network structure formed after crosslinking is more compact.

IV. Impact of Characteristics

1. Viscosity: As the value of n increases—that is, as the polyethylene glycol chain length grows—the viscosity of the compound also increases accordingly. Therefore, the viscosity of PEG (600) DA is typically higher than that of PEG (400) DA, and the viscosity of PEG (400) DA, in turn, is higher than that of PEG (200) DA.

2. Film-forming properties and crosslinking density: The length of the polyethylene glycol segments also affects the film-forming properties and crosslinking density of the compound. Longer segments tend to facilitate the formation of a denser and tougher crosslinked network.

3. Reactivity: Although the n values differ, these compounds all contain acrylate groups and thus exhibit excellent reactivity. Under conditions of light, heat, or radiation, the acrylate groups can undergo free-radical polymerization, forming a cross-linked network. Meanwhile, the polyethylene glycol segments provide good flexibility and hydrophilicity, enabling these compounds to perform exceptionally well in a wide range of applications.

V. Summary

Polyethylene glycol diacrylate is an important polymer compound with a variety of unique chemical and physical properties. As an active diluent, polyethylene glycol diacrylate not only dilutes the formulation but also participates in the curing reaction of resins, thereby enhancing their performance. It finds wide applications in fields such as pharmaceuticals, cosmetics, industry, and bioengineering. Its three derivatives with different molecular weights—polyethylene glycol (200) diacrylate, polyethylene glycol (400) diacrylate, and polyethylene glycol (600) diacrylate—each exhibit distinct characteristics in terms of properties and applications, making them suitable for various specific scenarios. When using PEGDA, one can select the appropriate molecular weight, viscosity, and purity based on the particular application scenario and requirements.

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Bifunctional Acrylate Reactive Diluent (II)

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Bifunctional Acrylate Reactive Diluent (I)

Bifunctional acrylate-based reactive diluents are a commonly used class of compounds in UV-curable systems. Their molecules contain two acrylate groups that can participate in the UV curing reaction. During the UV curing process, these diluents not only serve to dilute the formulation and adjust its viscosity but also undergo photoinitiated polymerization via their double bonds, forming a crosslinked structure that significantly enhances the physical and mechanical properties as well as the resistance of the cured film. Due to the presence of two reactive functional groups, their curing speed is faster than that of monofunctional diluents, thereby greatly improving production efficiency.

Vinyl-based reactive diluent

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