Synergistic Effect between Octaphenyl Silsesquioxane and Ammouium Polyphoshate in Flame-retarded Poly(lactic acid)

Lin Jia; Wen-chao Zhang; Bin Tong; Rong-jie Yang; Ding-hua Li

doi:10.11777/j.issn1000-3304.2018.18257

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Synergistic Effect between Octaphenyl Silsesquioxane and Ammouium Polyphoshate in Flame-retarded Poly(lactic acid)

Research Article | 更新时间：2021-01-26

- Synergistic Effect between Octaphenyl Silsesquioxane and Ammouium Polyphoshate in Flame-retarded Poly(lactic acid)
  增强出版
- Acta Polymerica Sinica Vol. 50, Issue 7, Pages: 740-751(2019)
- 作者机构：
  
  北京理工大学材料学院国家阻燃材料工程技术研究中心　北京 100081
- 作者简介：
- 基金信息：
- DOI：10.11777/j.issn1000-3304.2018.18257
  CLC：
- Published：2019-7，
  
  Published Online：23 January 2019，
  
  Received：28 November 2018，
  
  Revised：21 December 2018，
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Lin Jia, Wen-chao Zhang, Bin Tong, Rong-jie Yang, Ding-hua Li. Synergistic Effect between Octaphenyl Silsesquioxane and Ammouium Polyphoshate in Flame-retarded Poly(lactic acid). [J]. Acta Polymerica Sinica 50(7):740-751(2019)
DOI：

Lin Jia, Wen-chao Zhang, Bin Tong, Rong-jie Yang, Ding-hua Li. Synergistic Effect between Octaphenyl Silsesquioxane and Ammouium Polyphoshate in Flame-retarded Poly(lactic acid). [J]. Acta Polymerica Sinica 50(7):740-751(2019) DOI： 10.11777/j.issn1000-3304.2018.18257.

摘要

以高效阻燃聚乳酸(PLA)为目标，用有机-无机杂化的笼型八苯基硅倍半氧烷(OPS)和无机磷系阻燃剂高聚合度聚磷酸铵(APP)阻燃改性PLA. 采用双螺杆熔融共混挤出方法制备了PLA/OPS、PLA/APP及PLA/OPS+APP复合材料. 极限氧指数、垂直燃烧和锥形量热仪测试研究表明OPS和APP对PLA材料具有明显的阻燃效果，同时对于降低热释放速率具有一定的协同作用. 用扫描电镜(SEM)观察OPS、APP在PLA基体中的分散行为；通过热失重分析测试阻燃PLA复合材料的热稳定性；用SEM、能量色散X射线光谱和X射线光电子能谱测试研究了燃烧样品炭层的微观形貌和元素组成. 结果表明：OPS和APP在PLA基体中均匀分散；APP的初始热分解过程与PLA的初始热分解温度匹配，APP的高温热分解过程与OPS的热分解匹配，这种匹配的热分解过程和OPS与APP的协同作用提高了PLA材料的热稳定性，并赋予PLA良好的阻燃性能，降低了PLA复合物的热释放速率峰值的同时显著降低了由阻燃剂的添加引起的烟释放，同时维持了PLA材料的拉伸性能. 基于综合分析，推断出了3种阻燃PLA复合材料燃烧过程.

Abstract

The flame retardancy of poly(lactic acid) (PLA) was for the first time improved by a synergistic effect between octaphenyl silsesquioxane (OPS) the organic-inorganic hybrid and ammonium polyphosphate (APP) the inorganic phosphorus-based flame retardant. PLA/OPS

PLA/APP

and PLA/OPS+APP composites fabricated by twin-screw melt blending were subjected to a series of characterizations

including vertical test

cone calorimetry

and limiting oxygen index measurements. Remarkable enhancement was achieved for the flame retardant properties of PLA/OPS+APP

as OPS and APP could reduce synergistically the heat release rate (HRR) of PLA. Dispersion of OPS and APP in the PLA matrix was observed by scanning electron microscopy (SEM)

while thermal stability of the composites prepared was studied

via

thermogravimetric analysis (TGA). For an in-depth understanding of the combustion process

morphology and elemental composition of the char residues after cone calorimetry test were further investigated through SEM

energy dispersive X-ray spectrometry

and X-ray photoelectron spectroscopy. Results showed that both OPS and APP were uniformly distributed in the PLA matrix. Besides

the initial decomposition processes of APP and PLA were in good accordance with each other

while the thermal decomposition process of OPS agreed well with that of APP at high temperature; such matching decomposition processes and synergism between OPS and APP gave rise to an improved thermal stability of the PLA composites prepared. Apart from the reduction of HRR peak

OPS/APP synergy could diminish significantly the retardant-induced smoke release while maintaining a satisfactory tensile performance for the PLA material. Finally

underlying mechanisms of the specific combustion process were tentatively proposed for the three kinds of flame-retardant PLA composites.

关键词

聚乳酸笼型八苯基硅倍半氧烷聚磷酸铵协同阻燃

Keywords

Poly(lactic acid)Octaphenyl silsesquioxaneAmmouium polyphoshateFlame retardancy

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State Key Laboratory of Organic-Inorganic Composite Materials, Beijing Laboratory of Biomedical Materials, College of Life Science and Technology, Beijing University of Chemical Technology

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