Enhanced thermal and mechanical properties of flame-retardant expandable graphite modified silk fibroin-based rigid polyurethane foam

IF 6.4 2区工程技术 Q1 THERMODYNAMICS Case Studies in Thermal Engineering Pub Date : 2024-11-05 DOI:10.1016/j.csite.2024.105418

Xu Zhang , Qihong Guan , Qikai Xiao , Zhi Wang , Hua Xie

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Abstract

At present, in order to reduce the environmental pollution caused by the use of petrochemical products, the preparation of flame-retardant polyurethane foam (PUF) using green raw materials is increasingly attracting widespread attention. A biomass protein-based green flame-retardant rigid PUF (RPUF) with expandable graphite (EG) and silk fibroin (SF) was prepared in a one-step process. Thermal stability, combustion characteristics and compression properties of modified RPUFs were investigated by thermogravimetric analysis, cone test, limiting oxygen index (LOI) test, UL-94 vertical burning test and mechanical compression test. The RPUF with 10 wt% EG (RPUF-SF/EG10) exhibited superior heat resistance, with the highest initial decomposition temperature (Ti), integral programmed decomposition temperatures (IPDT) and activation energy (E). And RPUF-SF/EG10 had the lowest peak heat release rate (PHRR) and total heat release (THR), and it also showed the highest LOI and had a flammability rating of V-0. In Addition, the apparent density and compressive strength of RPUF-SF/EG10 were the largest among the four EG-added materials. The results indicated that RPUF-SF/EG10 had excellent thermal stability, flame retardancy and compression resistance, which was attributed to the synergistic effect of SF and EG in the system. This provided a valuable reference for the development of new, environmentally friendly and high-performance RPUFs.

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增强阻燃性可膨胀石墨改性丝纤维基硬质聚氨酯泡沫的热性能和机械性能

目前，为了减少使用石化产品造成的环境污染，使用绿色原料制备阻燃聚氨酯泡沫（PUF）正日益受到广泛关注。本研究采用一步法制备了一种基于生物质蛋白的绿色阻燃硬质聚氨酯泡沫（RPUF），其中含有可膨胀石墨（EG）和丝纤维素（SF）。通过热重分析、锥体试验、极限氧指数（LOI）试验、UL-94 垂直燃烧试验和机械压缩试验研究了改性 RPUF 的热稳定性、燃烧特性和压缩性能。含有 10 wt% EG 的 RPUF（RPUF-SF/EG10）表现出优异的耐热性，其初始分解温度（Ti）、积分程序分解温度（IPDT）和活化能（E）均最高。此外，RPUF-SF/EG10 的峰值放热率（PHRR）和总放热率（THR）最低，LOI 最高，可燃性等级为 V-0。此外，在四种添加 EG 的材料中，RPUF-SF/EG10 的表观密度和抗压强度最大。结果表明，RPUF-SF/EG10 具有优异的热稳定性、阻燃性和抗压性，这归功于体系中 SF 和 EG 的协同作用。这为开发新型、环保和高性能的 RPUF 提供了宝贵的参考。

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来源期刊

Case Studies in Thermal Engineering Chemical Engineering-Fluid Flow and Transfer Processes

CiteScore

8.60

自引率

11.80%

发文量

812

审稿时长

76 days

期刊介绍： Case Studies in Thermal Engineering provides a forum for the rapid publication of short, structured Case Studies in Thermal Engineering and related Short Communications. It provides an essential compendium of case studies for researchers and practitioners in the field of thermal engineering and others who are interested in aspects of thermal engineering cases that could affect other engineering processes. The journal not only publishes new and novel case studies, but also provides a forum for the publication of high quality descriptions of classic thermal engineering problems. The scope of the journal includes case studies of thermal engineering problems in components, devices and systems using existing experimental and numerical techniques in the areas of mechanical, aerospace, chemical, medical, thermal management for electronics, heat exchangers, regeneration, solar thermal energy, thermal storage, building energy conservation, and power generation. Case studies of thermal problems in other areas will also be considered.