Grafting polymerization of polylactic acid on the surface of nano-SiO2 and properties of PLA/PLA-grafted-SiO2 nanocomposites

Authors

  • Feng Wu,

    1. College of Polymer Science and Engineering, State Key Laboratory of Polymer Materials Engineering, Sichuan University, Chengdu, Sichuan 610065, China
    Search for more papers by this author
  • Xiaorong Lan,

    1. College of Polymer Science and Engineering, State Key Laboratory of Polymer Materials Engineering, Sichuan University, Chengdu, Sichuan 610065, China
    Search for more papers by this author
  • Deyun Ji,

    1. College of Polymer Science and Engineering, State Key Laboratory of Polymer Materials Engineering, Sichuan University, Chengdu, Sichuan 610065, China
    Search for more papers by this author
  • Zhengying Liu,

    1. College of Polymer Science and Engineering, State Key Laboratory of Polymer Materials Engineering, Sichuan University, Chengdu, Sichuan 610065, China
    Search for more papers by this author
  • Wei Yang,

    1. College of Polymer Science and Engineering, State Key Laboratory of Polymer Materials Engineering, Sichuan University, Chengdu, Sichuan 610065, China
    Search for more papers by this author
  • Mingbo Yang

    Corresponding author
    1. College of Polymer Science and Engineering, State Key Laboratory of Polymer Materials Engineering, Sichuan University, Chengdu, Sichuan 610065, China
    • College of Polymer Science and Engineering, State Key Laboratory of Polymer Materials Engineering, Sichuan University, Chengdu 610065, Sichuan, People's Republic of China
    Search for more papers by this author

Abstract

Poly(lactic acid) (PLA) chains are directly grafted onto a silicon surface by in situ amidation and PLA/PLA-grafted SiO2 nanocomposites are compounded using a Haake torque rheometer. To have a better understanding of the interaction between grafted polymer chains and PLA matrix, thermal, and rheological properties of PLA/PLA-grafted SiO2 nanocomposites are explored. DSC analysis shows that PLA-grafted-SiO2 can accelerate the cold crystallization rate and increase the degree of crystallinity of PLA. Shear rheology testing indicates that PLA/PLA-grafted-SiO2 nanocomposites still exhibits the typical homopolymer-like terminal behavior at low frequency range even at a content of PLA-grafted-SiO2 of 5 wt %, compared to PLA/SiO2, it is also found that the nanocomposites show stronger shear-thinning behaviors in the high frequency region after grafting. In addition, elongation viscosity testing shows the entanglement between grafted chains and matrix that is needed to improve the melt strength of PLA. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013

Ancillary