Novel hyperbranched polysiloxanes containing acetoacetyl groups synthesized through transesterification reaction

Area of Science:

• Polymer Chemistry
• Materials Science
• Environmental Science

Background:

• Conventional methods for hyperbranched polysiloxanes (HBPS) synthesis are complex and costly.
• Existing approaches often require precursor pre-synthesis, expensive catalysts, and risk gelation during hydrolysis.
• There is a need for efficient and accessible methods to produce functional HBPS.

Purpose of the Study:

• To develop an innovative and cost-efficient strategy for synthesizing novel hyperbranched polysiloxanes (HBPS).
• To create HBPS functionalized with acetoacetyl groups (HBPS-Ac) for specific applications.
• To evaluate the formaldehyde scavenging capabilities of the synthesized HBPS-Ac.

Main Methods:

• Synthesis of HBPS-Ac via a cost-efficient transesterification reaction.
• Characterization using gel permeation chromatography (GPC), FTIR, 1H NMR, and GC.
• Testing formaldehyde absorption by HBPS-Ac in coatings.

Main Results:

• A straightforward polymerization process was established for producing new HBPS.
• HBPS-Ac demonstrated highly efficient formaldehyde removal at room temperature.
• Coatings with 4 wt% HBPS-Ac showed significant formaldehyde absorption with minimal impact on integrated performance.

Conclusions:

• Transesterification offers a facile route to novel HBPS-Ac.
• HBPS-Ac are effective formaldehyde scavengers.
• These polymers show potential for use in formaldehyde-absorbing materials and coatings.