Lignin-Based Flame Retardants Containing Phosphorus, Nitrogen and Silicon Elements for Flame Retardant Polylactic Acid

被引：0
|
作者：
Song Y. [1 ]
Yang X. [1 ]
Lin K. [1 ]
Shan X. [2 ]
Li J. [1 ]
机构：
[1] School of Materials Science and Engineering, Changzhou University, Changzhou
[2] School of Environmental Science and Engineering, Changzhou University, Jiangsu
来源：
Gaofenzi Cailiao Kexue Yu Gongcheng/Polymeric Materials Science and Engineering | 2024年 / 40卷 / 03期
关键词：
alkali lignin; biobased flame retardants; flame retardancy; polylactic acid; thermal stability;
D O I：
10.16865/j.cnki.1000-7555.2024.0045
中图分类号：
学科分类号：
摘要：
Lignin-based flame retardant (FR-Lig) containing phosphorus, nitrogen and silicon elements was successfully prepared through alkali lignin (Lig) with 3-aminopropyl trimethoxysilane, 4-(diethylamino) salicylaldehyde and 9,10-dihydro-9-oxa-10-phosphorophenanthrene-10-oxide as modifiers by a three-step process. TGA results of FR-Lig show that compared with Lig, FR-Lig presents good thermal stability and charring ability in air, with T5% increased by 45 ℃, and the residual at 550 ℃ enhanced from 1.8% to 31.6%. FR-Lig was used to prepare fully bio-based flame retardant polylactic acid composites (FR-Lig/PLA), and the properties of FR-Lig/PLA were investigated in detail. It suggest that with the addditon of FR-Lig, the flame retardancy of PLA is improved. And with 20% FR-Lig loading amoun, the LOI value of PLA is increased to 27.5%, and the vertical combustion UL-94 passes V-0 level. Even if 10% FR-Lig can increase LOI of PLA by 2 values accompanied with UL-94 improving from no grade to V-2 grade; and the tensile strength of PLA reaches 41.8 MPa, and impact strength is increased by about 60% compared with pure PLA. Moreover, the thermal stability, fire resistance, and smoke suppression capabilities of PLA with 10% FR-LIg are enhanced. The analysis results of residual char and TG-IR for PLA show that both gas-phase flame retardancy and condensed phase flame retardancy work in PLA, in which the laterr plays a dominant role, and a possible flame retardant mechanism was proposed. © 2024 Sichuan University. All rights reserved.
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页码：12 / 22
页数：10
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