Metal-organic framework-derived bird's nest-like capsules for phosphorous small molecules towards flame retardant polyurea composites

Kunpeng Song; Henglai Zhang; Ye-Tang Pan; Zeeshan Ur Rehman; Jiyu He; De-Yi Wang; Rongjie Yang

doi:10.1016/j.jcis.2023.04.047

Metal-organic framework-derived bird's nest-like capsules for phosphorous small molecules towards flame retardant polyurea composites

J Colloid Interface Sci. 2023 Aug:643:489-501. doi: 10.1016/j.jcis.2023.04.047. Epub 2023 Apr 17.

Authors

Kunpeng Song¹, Henglai Zhang¹, Ye-Tang Pan², Zeeshan Ur Rehman³, Jiyu He⁴, De-Yi Wang⁵, Rongjie Yang¹

Affiliations

¹ National Engineering Research Center of Flame Retardant Materials, School of Materials Science & Engineering, Beijing Institute of Technology, Beijing 100081, PR China.
² National Engineering Research Center of Flame Retardant Materials, School of Materials Science & Engineering, Beijing Institute of Technology, Beijing 100081, PR China. Electronic address: pyt@bit.edu.cn.
³ College of Mechatronic Engineering, Changwon National University, Changwon, Gyeongsangnam-do 51140, Republic of Korea.
⁴ National Engineering Research Center of Flame Retardant Materials, School of Materials Science & Engineering, Beijing Institute of Technology, Beijing 100081, PR China. Electronic address: hejiyu@bit.edu.cn.
⁵ IMDEA Materials Institute, C/Eric Kandel, 2, 28906 Getafe, Madrid, Spain.

PMID: 37088052
DOI: 10.1016/j.jcis.2023.04.047

Abstract

The loading treatment of phosphorus flame retardants can mitigate their migration and plasticization effect. However, designing suitable carriers has remained a great challenge. Herein, two kinds of Co-based isomers, namely cobalt-cobalt layered double hydroxides (CoCo-LDH) and cobalt basic carbonate (CBC), were synthesized by employing ZIF-67 as a self-template, assemblied into two different nanostructures namely multi-yolk@shell CBC@CoCo-LDH (m-CBC@LDH) and solid CBC nanoparticles by facilely tuning the reaction time, which were employed as carriers, respectively. Subsequently, triphenyl phosphate (TPP)-loaded m-CBC@LDH (m-CBC-P@LDH) was prepared using TPP as the guest. The m-CBC@LDH with high specific surface area and hollow structure exhibited up to more than 30% of TPP loading. The peak of heat release rate and total heat release of polyurea composite blended with 5 wt% m-CBC-P@LDH reduced by 41.7% and 20.6% respectively, and the mechanical properties were less damaged. This work complements a feasible approach for preparation of metal-organic frameworks-derived flame retardant carriers.

Keywords: Flame retardancy; Mechanical properties; Metal-organic frameworks; Nano-structures; Polymer-matrix composites.