Effect carbon black microencapsulated ammonium polyphosphate on the flame retardancy and mechanical properties of polyurethane composites

ABSTRACT

Carbon black microencapsulated ammonium polyphosphate (APP@CB) was synthesized to enhance the interfacial compatibility, mechanical property and flame retardancy of polyurethane (TPU). The chemical structure of APP@CB hybrids were characterized by Raman spectra and scanning electron microscope. Compared with APP flame retardant TPU composite, the tensile strength of TPU composite containing APP@2CB increased by 23%, and the smoke density approximately decreased by 46%. This is owing to the strong interaction between the CB and TPU in TPU4 (flame retardant by APP@2CB) composite. Furthermore, the TPU4 composite restrained the smoke and toxic volatiles evolved, indicating suppressed toxicity of the TPU composites.

Graphical abstract

KEYWORDS:

• Microencapsulation
• Interfacial compatibility
• mechanical property
• flame retardancy
• smoke suppression

Acknowledgments

The work was financially supported by the National High-tech R&D program (No. 2016YFB0302104), the National Natural Science Foundation of China (No. U1833113 and 51303167), the Fundamental Research Funds for the Central Universities (No. WK2320000032), and China Postdoctoral Science Foundation (No. 2014T70598).

Additional information

Funding

This work was supported by the National Natural Science Foundation of China [U1833113 and 51303167]; the China Postdoctoral Science Foundation [2014T70598]; Fundamental Research Funds for the Central Universities [WK2320000032].