Flame Retardancyof Ramie Fabrics Treated by Layer-by-layer Assembly Technique ofTri-component PEI/PAA/APP

Li Zhao; Hong-qiang Yan; Zheng-ping Fang

doi:10.11777/j.issn1000-3304.2017.16323

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Flame Retardancyof Ramie Fabrics Treated by Layer-by-layer Assembly Technique ofTri-component PEI/PAA/APP

Research Article | 更新时间：2021-03-19

- Flame Retardancyof Ramie Fabrics Treated by Layer-by-layer Assembly Technique ofTri-component PEI/PAA/APP
- Acta Polymerica Sinica Issue 6, Pages: 982-989(2017)
- 作者机构：
  
  1.浙江大学宁波理工学院宁波 315100
  2.高分子合成与功能构造教育部重点实验室浙江大学高分子科学与工程学系杭州 310027
- 作者简介：
- 基金信息：
- DOI：10.11777/j.issn1000-3304.2017.16323
  CLC：
- Published：20 June 2017，
  
  Received：20 October 2016，
  
  Revised：21 November 2016，
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Li Zhao, Hong-qiang Yan, Zheng-ping Fang. Flame Retardancyof Ramie Fabrics Treated by Layer-by-layer Assembly Technique ofTri-component PEI/PAA/APP. [J]. Acta Polymerica Sinica (6):982-989(2017)
DOI：

Li Zhao, Hong-qiang Yan, Zheng-ping Fang. Flame Retardancyof Ramie Fabrics Treated by Layer-by-layer Assembly Technique ofTri-component PEI/PAA/APP. [J]. Acta Polymerica Sinica (6):982-989(2017) DOI： 10.11777/j.issn1000-3304.2017.16323.

摘要

利用聚乙烯亚胺（PEI）的正电荷性及聚磷酸铵（APP）和聚丙烯酸（PAA）的负电荷性，通过层层组装技术在柔顺多孔的苎麻织物表面交替构筑了（PEI/PAA/PEI/APP）

膨胀型阻燃涂层，并对处理前后的苎麻织物的热稳定性和阻燃性等性质进行了表征.热失重分析（TGA）、微型量热仪（MCC）以及垂直燃烧测试（VFT）结果表明，阻燃处理后织物的热稳定性和阻燃性显著提高.同时与（PEI/APP）

试样相比，引入不同浓度的第3组分PAA在组装层数较少时通过增加PEI的电荷密度等作用可有效增加吸附量从而使上述性能有所提高，层数较高时由于APP和PAA的同性电荷紊乱，阻燃性的提升受到限制.

Abstract

Multilayer flame-retardant coatings

consisting of opposite-charged polyelectrolyte polyethyleneimine (PEI)

ammonium polyphosphate (APP) and polyacrylic acid (PAA)

were constructed on the surface of soft and porous ramie fabrics by layer-by-layer (LBL) assembly technique. Attenuated total reflectionFourier transform infrared spectroscopy (ATR-FTIR) and field-emission scanningelectron microscopy with an energy-dispersive X-ray (SEM-EDX)analysis confirmedthat PAA was successfully introduced into the bi-component PEI/APP multilayer flame-retardant coatings.The P/C (phosphorus/carbon) ratio was clearly increased on the surface of the ramie fabric with the increase of the number of layers. The effect of PAA as a supplementary acid source on the flame retardancy of the treated ramie fabrics was studied by thermogravimetic analysis (TGA)

microscale combustion calorimetry (MCC) and vertical flame testing (VFT).The results of the thermal propertiesshowed thatthe char residue of the coated fabrics at high temperature during thermogravimetric analysis was significantly enhanced as compared with the untreated sample. Furthermore

the microscale combustion calorimetry revealed a reduction for both peak heat release rate (PHRR) and total heat release (THR). The surface morphologies of all the untreated and treatedramie fabrics after VFTdemonstrated that the PEI/APP/PAA coated specimenpreserved the integrity of the original texture of the ramie fabrics

and a dense and continuous expansion carbon layer was formedon the surface of the ramie fabric. The carbon layer effectively prevented oxygen and heat from penetrating into the substrate

thereby giving the ramie fabric excellent self-extinguishing properties.EDX spectra also revealed that the ratio of P/O (phosphorus/oxygen) and P/C of the char of the treated ramie fabric became high after combustion test. Compared to the bi-component (PEI/APP)

sample

the introduction of the third component PAA seemed to work at low assembly cycles by increasing the charge density of PEI

thus to improve the add-on of the FR coating on the fabric

but the concentration of PAA had little influence on the assembly process. However

the same charges may repel each other from the confusion of APP and PAA with high layers

causing the FR effect not that favorable.

关键词

阻燃性热性能苎麻织物层层组装多组分

Keywords

Flame retardancyThermal propertyRamie fabricsLayer-by-layer assemblyMulti-component

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