酯化木质素在不同溶剂介质中的热稳定性增强

Q2 Materials Science

Polymers from Renewable Resources Pub Date : 2018-01-01 DOI:10.1177/204124791800900103

Sharifah Hashim, S. Zakaria, C. Chia, Sharifah Nabihah Syed Jaafar

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引用次数: 1

摘要

本研究以油棕空果串(EFB-AL)和红麻芯(KC-AL)为原料，分别在两种不同条件下与马来酸酐酯化，分别为:1)吡啶在120℃下酯化3h, 2)水溶液在室温下酯化4h。结果表明，在吡啶中酯化的EFB-AL (EFB-EL)和酯化的KC-AL (KC-EL)的重量百分率(WPG)高于碱性水溶液。EFB-EL和KC-EL在两种溶剂中的FT-IR结果在羰基和羟基上都有一定的变化。此外，酯化过程还导致碱木质素样品中羧基峰的出现。通过H-NMR分析证实了这一结果，在光谱分析中发现了酯和羧酸峰。最后，TGA结果表明，EFB-EL和KC-EL在碱溶液中的热稳定性和活化能(Ea)均优于在吡啶溶液中的酯化产物。

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Enhanced Thermal Stability of Esterified Lignin in Different Solvent Mediums

In this study, soda alkali lignin from oil palm empty fruit bunch (EFB-AL) and kenaf core (KC-AL) are esterified with maleic anhydride under two different conditions, namely i) pyridine at temperature of 120°C for 3h and ii) aqueous alkaline solution at room temperature for 4h. As a result, the weight percentage gain (WPG) of the esterified EFB-AL (EFB-EL) and esterified KC-AL (KC-EL) in pyridine demonstrated a higher compared to aqueous alkaline solution. The FT-IR results of EFB-EL and KC-EL in both solvents exhibited some changes at the carbonyl and hydroxyl groups. Furthermore, the esterification process induced the carboxylic peak to appear in both alkali lignin samples. The outcome is confirmed by conducting H-NMR analysis, which demonstrated ester and carboxylic acid peaks within the spectral analysis. Finally, the TGA results showed both EFB-EL and KC-EL that are exposed to aqueous alkaline actually possessed better thermal stability and higher activation energy (Ea) compared to the esterified samples in pyridine.

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来源期刊

Polymers from Renewable Resources Materials Science-Polymers and Plastics

CiteScore

3.50

自引率

0.00%

发文量

期刊介绍： Polymers from Renewable Resources, launched in 2010, publishes leading peer reviewed research that is focused on the development of renewable polymers and their application in the production of industrial, consumer, and medical products. The progressive decline of fossil resources, together with the ongoing increases in oil prices, has initiated an increase in the search for alternatives based on renewable resources for the production of energy. The prevalence of petroleum and carbon based chemistry for the production of organic chemical goods has generated a variety of initiatives aimed at replacing fossil sources with renewable counterparts. In particular, major efforts are being conducted in polymer science and technology to prepare macromolecular materials based on renewable resources. Also gaining momentum is the utilisation of vegetable biomass either by the separation of its components and their development or after suitable chemical modification. This journal is a valuable addition to academic, research and industrial libraries, research institutions dealing with the use of natural resources and materials science and industrial laboratories concerned with polymer science.