PP particles are spherical polymer microspheres composed of polypropylene, a thermoplastic polymer produced through the addition polymerization of propylene monomers. They are manufactured through techniques such as suspension polymerization, melt dispersion, or emulsion-based granulation.

Key Properties of PP Particles

PP particles derive their utility from several intrinsic characteristics:

Outstanding Chemical Resistance

PP particles resist degradation by acids, bases, and many organic solvents, maintaining structural integrity in demanding environments. This chemical robustness makes them suitable for applications where other polymer particles might fail.

Excellent Thermal Stability and Heat Resistance

PP particles withstand elevated temperatures without compromising performance. This thermal stability is particularly valuable in industrial processing and high-temperature applications.

Low Density with Good Mechanical Strength

The lightweight nature of PP combined with robust mechanical properties makes these particles ideal for functional fillers and composite applications. Their high mechanical strength and good wear-resistant processing performance further enhance their utility in demanding applications.

Superior Moisture Barrier Properties

PP's inherent hydrophobicity provides excellent resistance to moisture absorption, critical for stable performance in aqueous environments. This property also contributes to the particles' dimensional stability.

Excellent Electrical Insulation

As a thermoplastic resin, PP exhibits good electrical insulation properties, making PP particles suitable for electronic and sensing applications.

Customizable Surface Functionality

The surface of PP particles can be modified with various functional groups to enable specific applications. BOT Bioparticles utilizes proprietary surface modification technologies—including plasma treatment and grafting of functional groups—to deliver PP particles with tailored surface characteristics.

Surface Functionalization

Bare PP particles are chemically inert and hydrophobic. Surface functionalization—the introduction of reactive chemical groups or biological ligands onto the particle surface—transforms them from passive carriers into active platforms for biomolecule conjugation.

These functionalized PP particles enable stable conjugation of antibodies, proteins, or nucleic acids, making them invaluable in diagnostics, biosensing, and targeted drug delivery.

Applications of PP Particles

PP particles find broad applications across biomedical and industrial fields. In biomedicine, they serve as drug delivery systems for sustained and targeted release, diagnostic probes for immunoassays and ELISA, and imaging agents when functionalized with fluorescent labels. Their monodispersity makes them ideal calibration standards for flow cytometry, while surface-functionalized variants (protein A/G, carboxyl, amino) enable protein and nucleic acid purification. Industrially, PP particles act as functional fillers in lightweight coatings and composites, separation media in filtration and HPLC, and additives in specialty adhesives and sealants. They are also used in additive manufacturing and as components in antimicrobial or antistatic composites. Their chemical resistance, thermal stability, and customizable surface chemistry make them versatile platforms across these diverse applications.

How to Buy?

BOT Bioparticles offers a comprehensive range of high-quality PP particles designed to meet diverse research and industrial needs:

Key Specifications:

l Wide size range: 50 nm to 200 μm

l Format: Aqueous suspensions or dry powders

l Surface functionalizations: NH₂, COOH, biotin, avidin, protein A, protein G, PDA

l Monodispersity: Polydispersity index ≤5%

l Fluorescent options: Blue (Ex 400 nm / Em 450 nm) and orange (Ex 540 nm / Em 580 nm) fluorescent particles with biotin functionalization

l Storage: 4°C in the dark, DO NOT FREEZE