Sustainable Approach for Mechanical Recycling of Poly(lactic acid)/Cellulose Nanocrystal Films: Investigations on Structure–Property Relationship and Underlying Mechanism,Industrial & Engineering Chemistry Research

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Sustainable Approach for Mechanical Recycling of Poly(lactic acid)/Cellulose Nanocrystal Films: Investigations on Structure–Property Relationship and Underlying Mechanism
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2018-10-17 , DOI: 10.1021/acs.iecr.8b02658
Prodyut Dhar _{1,

2} , Rajesh Kumar M ₃ , Siddharth Mohan Bhasney ₁ , Purabi Bhagabati ₁ , Amit Kumar ₁ , Vimal Katiyar ₁

Affiliation

This paper presents a green and sustainable route for mechanical recycling of poly(lactic acid) (PLA)/cellulose nanocrystal (CNC) based films multiple times, which results in enhanced thermal, rheological, and structural properties along with improved processability. Recycling of reactively extruded PLA/CNC films in the presence of dicumyl peroxide (DCP) was carried out with sulfuric and hydrochloric acid hydrolyzed CNCs (CNC-S and CNC-Cl). This shows improved thermal stability (improved by 12 °C), consistent M_w characteristics (180–150 kDa), and enhanced melt strength as evident from the thermal degradation studies and viscoelastic properties measured from rheological studies. The improved recyclability of PLA/CNC films was evident from enhanced complex viscosity and storage modulus of melt by ∼4 and 10 times along with increased mechanical strength of ∼16–30% even after the third recycling. Therefore, the present study provides a novel route to recycle PLA-based CNC films after their service life into value-added biodegradable products with adequate properties competitive enough to replace petroleum-based conventional plastics for commodity applications.

中文翻译：

机械回收聚乳酸/纤维素纳米晶体薄膜的可持续方法：结构-性能关系及其潜在机理的研究

本文提出了一种绿色且可持续的途径，用于多次机械回收基于聚乳酸（PLA）/纤维素纳米晶体（CNC）的薄膜，从而提高了热，流变性和结构性能，并改善了可加工性。在过氧化二枯基（DCP）存在下，用硫酸和盐酸水解的CNC（CNC-S和CNC-Cl）对反应挤出的PLA / CNC膜进行再循环。这显示出改善的热稳定性（提高了12°C），一致的M _w从热降解研究和流变学研究测得的粘弹性，可以明显看出其特性（180-150 kDa）和增强的熔体强度。PLA / CNC薄膜的可回收性得到了改善，即使在第三次回收后，复数粘度和熔体的储能模量提高了约4倍和10倍，机械强度提高了约16％至30％。因此，本研究提供了一种新颖的途径，可将基于PLA的CNC薄膜在使用寿命后回收为具有足够性能的增值生物可降解产品，该产品具有足够的竞争力，足以替代用于商业用途的石油基常规塑料。

更新日期：2018-10-18

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