Review on Modification of Poly (lactic acid) in Physical and Mechanical Properties

Wei Zou,1,3,#

Jintao Huang,2,3#,*Email

Jingtao Su,2

Wei Zeng,4

Yong Liang,3,5,6,*Email

Rongyuan Chen,3,7 

Haichen Zhang,3,8

Yonggang Min2 

Zhanhu Guo9,*Email

1 School of Mechatronic Engineering, Jiangsu Normal University, No.101, Shanghai Road, Xuzhou, Jiangsu, 221116, China

2 Department of Polymeric Materials and Engineering, School of Materials and Energy, Guangdong University of Technology, Guangzhou, 510006, China

3 Key Laboratory of Polymer Processing Engineering (South China University of Technology), Ministry of Education, Guangzhou, 510640, China

4 Institute of Chemical Engineering, Guangdong Academy of Sciences, Guangzhou, 510665, China

5 Faculty of Intelligent Manufacturing, Wuyi University, Jiangmen, 529020, China

6 Research Center for Polymer Engineering of Intelligent Manufacturing, Wuyi University, Jiangmen, 529020, China

7 College of Material and Chemical Engineering, Zhengzhou University of Light Industry, Zhengzhou, Henan, 450001, China

8 School of Materials Science and Hydrogen Energy, Guangdong Key Laboratory for Hydrogen Energy, Foshan University, Foshan, 528000, China

9 Integrated Composites Laboratory (ICL), Department of Chemical and Biomolecular Engineering, University of Tennessee, Knoxville, TN 37996, USA


Poly (lactic acid) (PLA), prepared from renewable resources such as corn and sugar beet, has good environmental friendliness, biocompatibility, bioabsorbability, biodegradability and energy saving. It is a polymer considered to replace traditional petroleum-based plastics. PLA has received widespread attention in recent years. However, PLA has defects such as high brittleness, poor heat resistance, poor hydrophilicity, low melt strength, and low tensile and flexural strength, which severely restrict the scope of PLA's application. Therefore, it is necessary to modify PLA to improve its toughness, thermal stability, hydrophilicity, melt strength and other mechanical properties in physical and mechanical properties. This article summarizes the toughening modification, heat resistance improvement, hydrophilicity improvement, melt strength improvement and other mechanical properties such as tensile strength improvement of PLA, respectively. The specific methods of PLA modification are summarized from the perspectives of chemical modification and physical modification.

Review on Modification of Poly (lactic acid) in Physical and Mechanical Properties