Issue 43, 2019

Improving the stability and ductility of polylactic acid via phosphite functional polysilsesquioxane

Abstract

To improve the stability and ductility of polylactic acid (PLA), chain extender or crosslinking agent of phosphite functional polysilsesquioxane (PPSQ) was synthesized by the reaction of phosphite group with the amino group of poly(amino-epoxy)silsesquioxane (PSQ). First, the reaction of PPSQ with PLA was characterized by molecular weight (Mw) and melt mass flow rate (MFR) of PLA after melting reaction. The results showed a 6.6% increase in the Mw of PLA and a 24.5% decrease in MFR value at the PPSQ loading content of 2 wt% in PLA, indicating that PPSQ takes chain extension or crosslinking in PLA. Then, this result was further supported by the thermal stability improvement of PLA, which was testified by the increase of oxidative activation energy and the oxygen onset temperature (OOT) value. PPSQ improved the water resistance and mechanical properties of PLA. The hydrolysis rate decreased by 46.8%, and the tensile strength and impact strength increased by 17.2% and 89.4%. Taken together, these results indicate that the addition of PPSQ can produce the PLA with excellent thermal stability, hydrolytic stability and mechanical properties.

Graphical abstract: Improving the stability and ductility of polylactic acid via phosphite functional polysilsesquioxane

Article information

Article type
Paper
Submitted
27 Apr 2019
Accepted
05 Aug 2019
First published
14 Aug 2019
This article is Open Access
Creative Commons BY-NC license

RSC Adv., 2019,9, 25151-25157

Improving the stability and ductility of polylactic acid via phosphite functional polysilsesquioxane

J. Luo, X. Meng, W. Gong, Z. Jiang and Z. Xin, RSC Adv., 2019, 9, 25151 DOI: 10.1039/C9RA03147B

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