High performance polydicyclopentadiene engineering materials with intrinsic flame retardancy: flexible copolymerization of flame-retardant elements and multiple interactions within aggregated structures

IF 7.4 2区化学 Q1 POLYMER SCIENCE

Polymer Degradation and Stability Pub Date : 2025-09-28 DOI:10.1016/j.polymdegradstab.2025.111695

Li Yang , Jie Xu , Ping Wang , Jiacheng Ling , Xinyun Hu , Wenxiu Liu , Yiyang Zhou , Tian Cao , Guilin Li , Jin Liu , Shaojie Feng

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引用次数: 0

Abstract

Improving the flame-retardant performance of polydicyclopentadiene (PDCPD) while maintaining mechanical properties has remained a technical challenge. In this study, a novel synchronous enhancement strategy for intrinsic flame retardancy and reinforcement based on frontal ring-opening metathesis polymerization (FROMP) was proposed, in which the newly synthesized phosphorus-containing norbornene flame retardant (NB-DPPC) and 5-norbornene-2-carboxylic acid (NB-COOH) were embedded into the cross-linked networks of PDCPD. The effects of NB-COOH and NB-DPPC on the thermodynamics and kinetics of the polymerization, as well as the crosslinked structure, mechanical properties, and flame retardancy of the copolymers, were systematically investigated. The results showed that by introducing NB-COOH into the PDCPD system improved the mechanical properties and flame resistance of the material. Specifically, the tensile strength and elongation at break of the specific copolymer reached 71.81 MPa and 123.62 %, which were 50.07 % and about 12 times higher than those of PDCPD, respectively. Meanwhile, the maximum limiting oxygen index (LOI) of the material reached 30.2 %, resulting in an increase of 51.76 %. According to the carbon layer structure and combustion gas composition, the flame retardant mechanism was further investigated. This work established a efficient method for the preparation of intrinsic flame retardant PDCPD and provided a strategy for constructing PDCPD materials with excellent comprehensive performance.

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具有内在阻燃性能的高性能聚双环戊二烯工程材料：阻燃元素的柔性共聚和聚集结构内的多重相互作用

提高聚双环戊二烯（PDCPD）的阻燃性能，同时保持其力学性能一直是一个技术难题。本研究提出了一种基于正面开环复分解聚合（FROMP）的内征阻燃同步增强策略，将新合成的含磷降冰片烯阻燃剂（NB-DPPC）和5-降冰片烯-2-羧酸（NB-COOH）嵌入到PDCPD的交联网络中。系统研究了NB-COOH和NB-DPPC对聚合热力学和动力学的影响，以及共聚物的交联结构、力学性能和阻燃性能。结果表明，在PDCPD体系中引入NB-COOH，提高了材料的力学性能和阻燃性。具体而言，该共聚物的抗拉强度和断裂伸长率分别达到71.81 MPa和123.62%，分别比PDCPD高50.07%和约12倍。同时，该材料的最大极限氧指数（LOI）达到30.2%，提高了51.76%。根据炭层结构和燃烧气体组成，进一步研究了其阻燃机理。本工作建立了一种高效制备本征阻燃剂PDCPD的方法，为构建综合性能优异的PDCPD材料提供了策略。

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来源期刊

Polymer Degradation and Stability 化学-高分子科学

CiteScore

10.10

自引率

10.20%

发文量

325

审稿时长

23 days

期刊介绍： Polymer Degradation and Stability deals with the degradation reactions and their control which are a major preoccupation of practitioners of the many and diverse aspects of modern polymer technology. Deteriorative reactions occur during processing, when polymers are subjected to heat, oxygen and mechanical stress, and during the useful life of the materials when oxygen and sunlight are the most important degradative agencies. In more specialised applications, degradation may be induced by high energy radiation, ozone, atmospheric pollutants, mechanical stress, biological action, hydrolysis and many other influences. The mechanisms of these reactions and stabilisation processes must be understood if the technology and application of polymers are to continue to advance. The reporting of investigations of this kind is therefore a major function of this journal. However there are also new developments in polymer technology in which degradation processes find positive applications. For example, photodegradable plastics are now available, the recycling of polymeric products will become increasingly important, degradation and combustion studies are involved in the definition of the fire hazards which are associated with polymeric materials and the microelectronics industry is vitally dependent upon polymer degradation in the manufacture of its circuitry. Polymer properties may also be improved by processes like curing and grafting, the chemistry of which can be closely related to that which causes physical deterioration in other circumstances.