Crystallization, Mechanical and Flame-retardant Properties of Poly(lactic acid) Composites with DOPO and DOPO-POSS

Lin Jia; Wen-Chao Zhang; Bin Tong; Rong-Jie Yang

doi:10.1007/s10118-018-2098-7

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Crystallization, Mechanical and Flame-retardant Properties of Poly(lactic acid) Composites with DOPO and DOPO-POSS

ARTICLE | Updated：2021-02-18

- Crystallization, Mechanical and Flame-retardant Properties of Poly(lactic acid) Composites with DOPO and DOPO-POSS
- Chinese Journal of Polymer Science Vol. 36, Issue 7, Pages: 871-879(2018)
- Affiliations：
  
  National Engineering Research Center of Flame Retardant Materials, School of Materials Science and Engineering, Beijing Institute of Technology, Beijing 100081, China
- Author bio：
  
  yrj@bit.edu.cn
- Funds：
- DOI：10.1007/s10118-018-2098-7
  CLC：
- Received：09 October 2017，
  
  Accepted：28 November 2017，
  
  Online First：01 March 2018，
  
  Published：2018-07
- Accepted：
Scan QR Code
Lin Jia, Wen-Chao Zhang, Bin Tong, et al. Crystallization, Mechanical and Flame-retardant Properties of Poly(lactic acid) Composites with DOPO and DOPO-POSS[J]. Chinese Journal of Polymer Science, 2018, 36(7): 871-879.
DOI：

Lin Jia, Wen-Chao Zhang, Bin Tong, et al. Crystallization, Mechanical and Flame-retardant Properties of Poly(lactic acid) Composites with DOPO and DOPO-POSS[J]. Chinese Journal of Polymer Science, 2018, 36(7): 871-879. DOI： 10.1007/s10118-018-2098-7.

摘要

Abstract

Poly(lactic acid) (PLA) composites with 9

10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO) and DOPO-containing polyhedral oligomeric silsesquioxane (DOPO-POSS) were prepared

via

melting extrusion and injection molding. The crystallization

mechanical

and flame-retardant properties of PLA/DOPO and PLA/DOPO-POSS were investigated by differential scanning calorimetry (DSC)

X-ray diffraction (XRD)

tensile testing

thermogravimetric analysis (TGA)

limiting oxygen index (LOI)

and cone calorimeter test. The DSC results showed that the DOPO added could act as a plasticizer as reflected by lower glass transition temperature and inhibited crystallization of part of the PLA; the DOPO-POSS acted like a filler in the PLA matrix and slightly improved the crystallinity of the PLA matrix. The XRD and DSC analyses indicated that the PLA composites by cold molding injection were amorphous

and the PLA composites following a heat treatment in an oven at 120 °C for 30 min achieved crystallinity. All the PLA and its composites after heat treatment had improved mechanical properties. The thermogravimetric analysis (TGA) tests showed that the PLA

DOPO and DOPO-POSS decomposed separately in the PLA/DOPO and PLA/DOPO-POSS

respectively. The cone calorimeter tests offered clear evidence that addition of the DOPO-POSS resulted in an evident reduction of 25% for the peak of heat release rate (p-HRR). It was also confirmed that the crystalline flame-retardant PLA composites after heat treatment had better flame retardant properties than the amorphous PLA composites prepared by the cold molding.

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references

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