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A novel functional lignin-based filler for pyrolysis and feedstock recycling of poly(L-lactide)


Poly(L-lactide) (PLLA) is one of the most attractive environmental friendly polymer. However, there are also some drawbacks that are difficult to avoid such as high cost, single-function, and especially racemization of lactide during the recycling process. Previously, lignin-graft-poly(D-lactic acid) (LG-g-PDLA) was reported with a UV blocking capability, good compatibility and accelerating the crystallization in PLLA system. With the deepening of this research, we noted an unexpected effect of this copolymer on the thermal degradation and L-lactide recovery of PLLA. Herein, to clarify the effects of LG-g-PDLA in PLLA pyrolysis, PLLA/LG-g-PDLA blend film were prepared. The pyrolysis products, thermal degradation kinetics and mechanism of the blend film were studied in detail with thermogravimetric analysis (TGA) and pyrolysis-gas chromatograph/mass spectra (Py-GC/MS). During the pyrolysis, the LG-g-PDLA fragments with free-radicals could condense with the carboxyl ends of PLLA. PLLA could effectively unzipping depolymerize to avoid racemization and produce more the optically pure L-lactide. This is the first report of lignin-based filler with multifunction; besides adding the properties and enhancing the performances of PLLA application, the PLLA/LG-g-PDLA blend system also presented a good example of completely green materials for feedstock recycling.

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Publication details

The article was received on 26 Dec 2017, accepted on 09 Mar 2018 and first published on 09 Mar 2018

Article type: Paper
DOI: 10.1039/C7GC03863A
Citation: Green Chem., 2018, Accepted Manuscript
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    A novel functional lignin-based filler for pyrolysis and feedstock recycling of poly(L-lactide)

    L. Dai, R. Liu and C. Si, Green Chem., 2018, Accepted Manuscript , DOI: 10.1039/C7GC03863A

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