Preparation and Flame Retardancy of the Irradiation‑crosslinked PE‑based Composites Containing a Cyclophosphazene Derivative

doi:10.19894/j.issn.1000-0518.210557

Chinese Journal of Applied Chemistry ›› 2022, Vol. 39 ›› Issue (11): 1672-1679.DOI: 10.19894/j.issn.1000-0518.210557

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Preparation and Flame Retardancy of the Irradiation‑crosslinked PE‑based Composites Containing a Cyclophosphazene Derivative

Bing-Bing LENG¹, Chun-Hui ZHU², Cheng-Ying SHI³, Zhi-Peng WANG¹, Yang LIU, Hong-Yan ZHANG, Wen-Ge XU, Bai-Jun LIU³()

^1.（Changchun Power Supply Company，State Grid （Jilin Province） Electric； Power Co. ，Ltd. ，Changchun 130000，China ）
^2.（Economic and Technological Research Institute，State Grid （Jilin Province） Electric； Power Co. ，Ltd. ，Changchun 130000，China ）
^3.College of Chemistry，Jilin University，Changchun 130012，China
^4.Changchun Radiation Technology Co. ，Ltd. ，China Isotope & Radiation Corporation （CIRC），Changchun 130000，China

Received:2021-12-04 Accepted:2022-04-20 Published:2022-11-01 Online:2022-11-09
Contact: Bai-Jun LIU
About author:liubj@jlu.edu.cn
Supported by:
the Science and Technology Project of State Grid Jilin Electric Power Co., Ltd., China(SGJLCC00KJJS2101813)

Abstract

Abstract:

An allyl functionalized cyclotriphosphazene， which is expected to serve as flame retardant and irradiation sensitizer， is introduced into the matrix composed of low-density polyethylene and ethylene vinyl acetate copolymer by melt blending. Based on the organic-inorganic complex flame retardants， a family of new halogen-free flame retardant insulating composites is prepared. Furthermore， the irradiation crosslinking of the composites is conducted by electron-beam irradiation at the irradiation doses of 100~190 kGy， and the relationship between irradiation dose and properties is investigated. The results indicate that the irradiation crosslinked composites containing functional cyclotriphosphazene have excellent mechanical strength， flame retardancy and electrical insulation properties， and they may be promising for wire and cable applications.

Key words: Irradiation crosslinking, Cyclophosphazene, Cross-linked networks, Flame retardancy

CLC Number:

O631

Bing-Bing LENG, Chun-Hui ZHU, Cheng-Ying SHI, Zhi-Peng WANG, Yang LIU, Hong-Yan ZHANG, Wen-Ge XU, Bai-Jun LIU. Preparation and Flame Retardancy of the Irradiation‑crosslinked PE‑based Composites Containing a Cyclophosphazene Derivative[J]. Chinese Journal of Applied Chemistry, 2022, 39(11): 1672-1679.

Figures/Tables 9

Table 1 Formulation of the irradiation?crosslinked PE?based composites containing organic?inorgance flame retardants

样品 Sample	聚乙烯添加量 PE/phr	乙烯?醋酸乙烯共聚物添加量EVA/phr	氢氧化镁添加量 Mg（OH）₂/phr	氢氧化铝添加量 Al（OH）₃/phr	有机阻燃剂添加量 CP?Allyl/phr
Composite?0	100	40	100	100	0
Composite?1	100	40	100	100	2
Composite?2	100	40	100	100	5
Composite?3	100	40	100	100	8
Composite?4	100	40	100	100	10
Composite?5	100	40	100	100	15

Fig.1 Melt index （A） and relationship between irradiation dose and gel content （B） of the composites

Fig.2 Illustration of cross-linked PE/EVA networks containing allyl-functionalized cyclotriphosphazene

Fig.3 SEM photos of CP-Allyl powder and Composite-X specimens （A.CP-Allyl powder； B-F.Composite-1，2，3，4 and 5）

Fig.4 LOI values of the composites under different irradiation doses

Fig.5 A suggested flame retardancy mechanism of cross-linked PE/EVA networks based on organic-inorganic flame retardant

Fig.6 Thermogravimetric curves of composites at irradiation dose of 100 kGy

Fig.7 Tensile stress （A） and elongation at break （B） of the composites under different irradiation doses

Table 2 Insulation properties of the composites

样品 Sample	电阻 Resistance/Ω	体积电阻率 Volume resistivity/（Ω·cm）	电容 Capacitance/pF	介电常数 Permittivity
Composite?0	2.75×10¹²	5.68×10¹⁴	55	2.8
Composite?1	3.81×10¹²	8.04×10¹⁴	57	2.8
Composite?2	2.71×10¹²	5.97×10¹⁴	58	2.7
Composite?3	2.93×10¹²	5.93×10¹⁴	58	3.0
Composite?4	2.47×10¹²	4.57×10¹⁴	53	3.0
Composite?5	2.94×10¹²	5.89×10¹⁴	54	2.8

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Preparation and Flame Retardancy of the Irradiation‑crosslinked PE‑based Composites Containing a Cyclophosphazene Derivative

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