Term: Hydrophobic Polymer

Category: Polymers

Definition: Hydrophobic polymers’ molecules consist mostly of non-polar hydrocarbon or fluorocarbon backbones, and are not attracted to water. This means hydrophobic polymers will not easily absorb or swell in water, have low surface energy, resist chemical damage, and remain mechanically stable.

These characteristics make hydrophobic polymers suitable for applications where moisture will be present and moisture resistance is necessary, for example, when used as barrier materials or when structural integrity is needed over a long period of time.

Structure:Polymer backbone dominated by nonpolar groups such as –CH₂–, –CH₃, or –CF₂– with few or no polar functional groups.

Source: Can be natural, semi-synthetic, or synthetic (depending on polymer type).

Common Uses: 

• In biomedical applications, hydrophobic polymers are used in implants, controlled drug delivery systems, and protective coatings where water resistance and mechanical durability are essential. 
• They are commonly employed as structural materials in orthopedic and cardiovascular devices, as well as in implant coatings that provide barrier properties or regulate drug release while maintaining stability in physiological environments.

Examples of Hydrophobic Polymers:

• PTFE
• Silicone
• etc.

Related Content and Resources: 

Differences Between Hydrophilic and Hydrophobic Coatings

Water Wonders: Hydrophobic vs. Hydrophilic Coatings

Silicone Coatings for Medical Devices: Pros, Cons, Alternatives