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Improved Polydimethylsiloxane (PDMS) Double Casting via Silicone Oil Treatment for Densely Packed Microstructure Replication

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High-Temperature Resistant Polyborosilazanes with Tailored Structures.

Bijie Wang^1,2, Ke Chen^2,3, Tianhao Li^2,3

¹Guangxi Key Laboratory of Petrochemical Resource Processing and Process Intensification Technology, School of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, China.

|February 4, 2021

Summary

This summary is machine-generated.

This study introduces a solventless method for creating boron-containing silicone polymers. These novel polymers exhibit excellent thermal stability and flame retardancy, making them suitable for harsh environments.

Keywords:

boron-containing polymer high temperature resistant polyborosilazane

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Area of Science:

Materials Science
Polymer Chemistry

Background:

Boron-containing organosilicon polymers are vital preceramic materials for harsh environments.
Current synthesis methods often involve harmful chemicals and complex routes, limiting their use.

Purpose of the Study:

To develop a safer and simpler synthesis for boron-containing silicone polymers.
To investigate the thermal stability and flame retardancy of the synthesized polymers.

Main Methods:

A two-component, solventless synthesis route was employed.
Cross-linked boron-containing silicone polymer (CPBCS) was synthesized by reacting multifunctional boron hybrid silazane monomers (BSZ12) and poly[imino(methylsilylene)].
Polymer structure and boron content were tuned by adjusting monomer ratios.

Main Results:

The synthesized CPBCSs demonstrated high thermal stability with 75 wt% char yield at 1000 °C.
Excellent flame retardancy was observed, with low heat release capacity (37.9 J/g K) and total heat release (6.2 KJ/g).
Good mechanical properties were noted, with reduced modulus of 0.30 GPa and hardness of 2.32 GPa.

Conclusions:

The solventless synthesis offers a safer and more efficient alternative for producing boron-containing silicone polymers.
The resulting polymers exhibit promising properties for applications in high-temperature and fire-hazardous conditions.
These novel polysilazanes hold potential for advanced ceramics fabrication and protective materials.