基于甲壳素的膨胀型阻燃剂聚乳酸复合材料的制备与表征

The Preparation and Characterization of Polylactic Acid Composites with Chitin-Based Intumescent Flame Retardants.

作者信息

Jin Xiaodong, Cui Suping, Sun Shibing, Sun Jun, Zhang Sheng

机构信息

Faculty of Materials and Manufacturing, Beijing University of Technology, Beijing 100124, China.

Beijing Key Laboratory of Advanced Functional Polymer Composites, School of Material Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, China.

出版信息

Polymers (Basel). 2021 Oct 13;13(20):3513. doi: 10.3390/polym13203513.

DOI:10.3390/polym13203513

PMID:34685273

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC8536992/

Abstract

In this work, a novel intumescent flame retardant (IFR) system was fabricated by the introduction of chitin as a green charring agent, ammonium polyphosphate (APP) as the acid source, and melamine (MEL) as the gas source. The obtained chitin-based IFR was then incorporated into a polylactic acid (PLA) matrix using melt compounding. The fire resistance of PLA/chitin composites was investigated via the limiting oxygen index (LOI), UL-94 vertical burning, and cone calorimeter (CONE) tests. The results demonstrated that the combination of 10%APP, 5%chitin and 5%MEL could result in a 26.0% LOI, a V-0 rating after UL and a 51.2% reduction in the peak heat release rate during the CONE test. Based on the mechanism analysis from both the morphology and the chemical structure of the char, it was suggested that chitin was a promising candidate as a charring agent for chitin reacted with APP and MEL with the formation of an intumescent layer on the surface.

摘要

在本研究中，通过引入作为绿色炭化剂的甲壳素、作为酸源的聚磷酸铵（APP）和作为气源的三聚氰胺（MEL），制备了一种新型膨胀型阻燃剂（IFR）体系。然后，采用熔融共混法将所得的基于甲壳素的IFR引入聚乳酸（PLA）基体中。通过极限氧指数（LOI）、UL-94垂直燃烧和锥形量热仪（CONE）测试研究了PLA/甲壳素复合材料的阻燃性能。结果表明，10%APP、5%甲壳素和5%MEL的组合可使LOI达到26.0%，在UL测试后达到V-0等级，并且在CONE测试期间峰值热释放速率降低51.2%。基于对炭的形态和化学结构的机理分析，表明甲壳素作为炭化剂具有很大潜力，因为甲壳素与APP和MEL反应，在表面形成了膨胀层。