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Journal of Polymers and the Environment

, Volume 27, Issue 8, pp 1721–1734 | Cite as

Microcellular Foaming Behaviors of Poly (Lactic Acid)/Low-Density Polyethylene Blends Induced by Compatibilization Effect

  • Xianzeng Wang
  • Yang Li
  • Yang Jiao
  • Hongfu ZhouEmail author
  • Xiangdong WangEmail author
Original paper
  • 75 Downloads

Abstract

A facile methodology for improving the crystallization ability, rheological properties and microcellular foaming behaviors of poly (lactic acid)/low-density polyethylene (PLA/LDPE) blends through compatibilization was proposed. Poly (ethylene octene) grafted with glycidyl methacrylate (GPOE) as reactive compatibilizer was introduced into PLA/LDPE blends and the resultant PLA/LDPE/GPOE blends were foamed by supercritical CO2. Torque curves and Fourier transformation infrared spectroscopy results confirmed that GPOE reacted with PLA successfully. The crystallization ability and rheological properties of PLA was promoted obviously by the addition of LDPE and GPOE. The size of LDPE dispersion phase in PLA/LDPE blends decreased from 4.4 ± 0.1 to 1.2 ± 0.1 µm, owing to the compatibility effect. When the content of GPOE reach 8 phr, microcellular structure appeared in the PLA/LDPE/GPOE blending foam. An interesting flower-like cellular structure was observed in PLA/LDPE/GPOE blending foams, with the foaming temperature at 85 and 90 °C. Finally, the microcellular foaming mechanism for various PLA foams was proposed and clarified using schematic diagram.

Keywords

Poly (lactic acid) Low-density polyethylene Microcellular Foam Compatibilization 

Notes

Acknowledgements

This work was supported by the National Science Foundation of China (51703004 and 51673004) and Building of Innovative Team Plan (IG201703N).

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Authors and Affiliations

  1. 1.School of Materials and Mechanical EngineeringBeijing Technology and Business UniversityBeijingPeople’s Republic of China
  2. 2.Beijing Key Laboratory of Quality Evaluation Technology for Hygiene and Safety of PlasticsBeijingPeople’s Republic of China
  3. 3.Beijing Ray Applied Research CentreBeijingPeople’s Republic of China

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