Novel Biocomposites Based on El Retma Natural Fiber and PLA/PC Mixture Compatibilized Using Samarium Acetylacetonate Catalyzed Interchange Reactions

IF 1 4区化学 Q4 POLYMER SCIENCE Polymer Science, Series B Pub Date : 2022-04-29 DOI:10.1134/S1560090422200052

Ali Larous, Melia Guessoum, Sorya Nekkaa, Magali Fois

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Abstract—

In this work, the properties of biocomposites based on poly(lactic acid)/polycarbonate (PLA/PC) mixture and a flour obtained from a local plant which is El Retma (RET) are investigated. Due to the incompatibility of PLA/PC matrix, a transesterification catalyst which is samarium acetylacetonate (Sm) is added to promote interchange reactions and synthesize PLA-PC copolymer at the interface between the polymers. Furthermore, to improve adhesion of the natural fiber to the matrix, RET flour has been pretreated using an alkaline solution before treatment with maleic anhydride (MA). Also, to point out the effect of the rate of MA grafting and RET flour size, the properties of biocomposites based on MA-RET flours with flour sizes below 100 and 50 µm are compared. The composites with mixing time varying from 10 and 20 min have also been studied because they are expected to present different performances due to the different extents of catalyzed transesterification reactions. Fourier transform infrared spectroscopy (FTIR) and thermogravimetric analysis attested for the grafting of maleic anhydride grafting after the observation of carbonyl group band in FTIR spectra of MA-RET flour and the improvement of its thermal stability compared to the pretreated flour. The composite PLA/PC/Sm/MA-RET melt mixed during 20 min revealed better impact resistance, thermal stability and storage modulus due to the eventual higher concentration of PLA-PC copolymer and grafting of PLA and PC chains on the flour.

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基于El Retma天然纤维和PLA/PC混合物的新型生物复合材料，采用乙酰丙酮钐催化交换反应

摘要/ abstract摘要:本文研究了以聚乳酸/聚碳酸酯(PLA/PC)混合物和从当地植物El Retma (RET)中获得的面粉为基础的生物复合材料的性能。由于PLA/PC基体不相容，在聚合物界面处加入乙酰丙酮钐(Sm)酯交换催化剂促进交换反应，合成PLA-PC共聚物。此外，为了提高天然纤维与基体的附着力，RET面粉在用马来酸酐(MA)处理之前，先用碱性溶液进行预处理。此外，为了指出MA接枝率和RET面粉尺寸的影响，比较了面粉尺寸小于100µm和50µm的MA-RET生物复合材料的性能。混合时间为10和20 min的复合材料，由于催化酯交换反应的程度不同，预计其性能也会有所不同，因此也进行了研究。傅里叶变换红外光谱(FTIR)和热重分析通过观察MA-RET面粉FTIR光谱中的羰基带，证实了马来酸酐接枝的存在，并且与预处理面粉相比，其热稳定性得到了改善。混合时间为20 min的PLA/PC/Sm/MA-RET复合熔融体，由于最终PLA-PC共聚物浓度较高，PLA和PC链接枝在面粉上，表现出较好的抗冲击性、热稳定性和存储模量。

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来源期刊

Polymer Science, Series B 化学-高分子科学

CiteScore

1.80

自引率

8.30%

发文量

审稿时长

>0 weeks

期刊介绍： Polymer Science, Series B is a journal published in collaboration with the Russian Academy of Sciences. Series B experimental and theoretical papers and reviews dealing with the synthesis, kinetics, catalysis, and chemical transformations of macromolecules, supramolecular structures, and polymer matrix-based composites (6 issues a year). All journal series present original papers and reviews covering all fundamental aspects of macromolecular science. Contributions should be of marked novelty and interest for a broad readership. Articles may be written in English or Russian regardless of country and nationality of authors. All manuscripts are peer reviewed