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Preparation and flame retardance of polyethylene composites with microencapsulated resorcinol bis(diphenyl phosphate), red phosphorus and magnesium hydroxide

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Abstract

Polyethylene (PE) modification to have flame retardant and anti-dripping capabilities is indispensable for public safety and environmental protection. To the end, PE modification with flame retardant resorcinol bis(diphenyl phosphate) (RDP) is suggested but a poor compatibility of PE with RDP is problematic. In this work, a microencapsulation of RDP using melamine-urea-formalin resin as shell material was proposed to resolve the compatibility problem, making PE composites with microencapsulated RDP (MCRDP), red phosphorus (MCRP) and magnesium hydroxide (MH). Through the material characterization, it was found that the spherical MCRDP particles were fabricated in homogeneous distribution of particle sizes. The flame retardance of the PE composite samples with different compositions was tested according to the UL-94 method, finding that the PE/20%MCRDP/5%MCRP/5%MH composite has the best performance. Moreover, the thermogravimetric analysis showed that this composite exhibited higher decomposition temperature than pure PE and PE/30%MCRDP composite, revealing the P-N synergy effect on improving the flame retardance of PE composites.

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Abbreviations

PE:

Polyethylene

RDP:

Resorcinol bis(diphenyl phosphate)

BDP:

Bisphenol-A bis(diphenyl phosphate)

RDT:

Resorcinol diphosphoryl tetrachloride

RP:

Red phosphorus

FR:

Flame retardant

IFR:

Intumescent flame retardant

MC:

Microcapsule

MCRDP:

Microencapsulated resorcinol bis(diphenyl phosphate)

MCRP:

Microencapsulated red phosphorus

MUF:

Melamine-urea-formalin

LOI:

Limiting oxygen index

MH:

Magnesium hydroxide

FTIR:

Fourier-transform infrared

PSD:

Particle size distribution

SEM:

Scanning electron microscope

TG:

Thermogravimetric

DTG:

Differential thermogravimetric

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Acknowledgements

This work is supported as part of the fundamental research project (No. 2022-13) funded by the State Commission of Science and Technology, DPR Korea. The analysis of FTIR, SEM and TG was performed at the Institute of Analysis, Kim Il Sung University, recognized as a certificate institution in DPR Korea.

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Authors and Affiliations

  1. Faculty of Chemistry, Kim I1 Sung University, Ryongnam-Dong, Taesong District, Pyongyang, Democratic People’s Republic of Korea

    Chung-Guk Choe, Yong-Man Jang & Chung-Hyok Jo

  2. Faculty of Materials Science, Kim I1 Sung University, Ryongnam-Dong, Taesong District, Pyongyang, Democratic People’s Republic of Korea

    Chol-Jun Yu

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Contributions

C-GC: data curation, investigation, resources. Y-MJ: conceptualization, methodology, writing—original draft. C-HJ: formal analysis, data curation, investigation. C-JY: software, visualization, writing—review & editing, supervision.

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Correspondence to Chol-Jun Yu.

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Choe, CG., Jang, YM., Jo, CH. et al. Preparation and flame retardance of polyethylene composites with microencapsulated resorcinol bis(diphenyl phosphate), red phosphorus and magnesium hydroxide. Polym. Bull. 80, 9727–9744 (2023). https://doi.org/10.1007/s00289-022-04520-8

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