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

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A novel functional lignin-based filler for pyrolysis and feedstock recycling of poly(L-lactide)
Green Chemistry ( IF 9.3 ) Pub Date : 2018-03-09 , DOI: 10.1039/c7gc03863a
Lin Dai _{1,

2,

3,

4,

5} , Rui Liu _{1,

2,

3,

4,

5} , Chuanling Si _{1,

2,

3,

4,

5}

Affiliation

Poly(L-lactide) (PLLA) is one of the most attractive environmental-friendly polymer. However, it has some drawbacks that are difficult to avoid such as high cost, single-function, and particularly racemization of lactide during the recycling process. Previously, lignin-graft-poly(D-lactic acid) (LG-g-PDLA) was reported with UV blocking capability, good compatibility and the ability to accelerate crystallization in PLLA systems. Upon further 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, a PLLA/LG-g-PDLA blend film was prepared. The pyrolysis products, thermal degradation kinetics and mechanism of the blend film were studied in detail via thermogravimetric analysis (TGA) and pyrolysis-gas chromatography/mass spectroscopy (Py-GC/MS). During pyrolysis, the LG-g-PDLA fragments possessing free-radicals condense with the carboxyl ends of PLLA. PLLA could effectively undergo unzipping depolymerization to avoid racemization and produce more optically pure L-lactide. This is the first report of a lignin-based filler with multifunction. In addition to adding properties and enhancing the performances of PLLA application, the PLLA/LG-g-PDLA blend system also presents a good example of completely green materials for feedstock recycling.

中文翻译：

一种新型的功能性木质素基填料，用于聚（L-丙交酯）的热解和原料循环

聚（L-丙交酯）（PLLA）是最有吸引力的环保聚合物之一。但是，它具有一些难以避免的缺点，例如成本高，功能单一，尤其是在回收过程中丙交酯的消旋化。以前，据报道木质素接枝聚乳酸（D-乳酸）（LG- g- PDLA）具有紫外线阻隔能力，良好的相容性和加速PLLA系统中结晶的能力。经过进一步的研究，我们注意到该共聚物对PLLA的热降解和L-丙交酯的回收具有出乎意料的作用。在此，为了阐明LG- g- PDLA在PLLA热解中的作用，PLLA / LG- g-制备PDLA共混膜。通过热重分析（TGA）和热解-气相色谱/质谱（Py-GC / MS），对共混膜的热解产物，热降解动力学和机理进行了详细研究。在热解过程中，具有自由基的LG- g -PDLA片段与PLLA的羧基末端缩合。PLLA可以有效地进行解链解聚反应，以避免外消旋作用，并产生更多的光学纯的L-丙交酯。这是具有多功能性的木质素基填料的首次报道。除了增加性能并增强PLLA应用的性能外，PLLA / LG- g -PDLA共混体系还提供了一个完全绿色的原料循环利用的好例子。

更新日期：2018-04-23

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