Enzymatic modification of cellulose nanofibers to enhance thermal resistance and to decrease hydrophilicity

IF 4.8 2区 工程技术 Q1 MATERIALS SCIENCE, PAPER & WOOD
Akihiro Hideno, Junpei Nouta, Daiki Yokota
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Abstract

Cellulose nanofibers (CNFs), which are crystalline cellulosic fibers 3–100 nm in width, are promising advanced materials. CNFs have attractive considerable attention due to their light weight, high strength, and large surface area. However, increasing thermal stability is a challenge in the application of CNFs. Generally, CNFs contain trace substances such as hemicellulose, which have a lower thermal degradation temperature than cellulose. Therefore, hemicellulose may decrease the thermal degradation temperature of CNFs. To increase the thermal stability of CNFs by removing hemicellulose, commercial CNFs were subjected to several cellulases and hemicellulases, and evaluated by thermogravimetric analysis. Our results showed that xylanase treatment for 1 h increased the pyrolysis temperature of the CNFs. Next, the basic sheet properties of enzyme-treated CNFs were investigated. The tensile strength of the CNF sheets decreased after enzymatic treatment, however, their contact angles increased. These results indicate that the hydrophilicity of the surfaces of the CNFs was decreased by biomass-degrading enzymatic treatment.

Abstract Image

Abstract Image

纤维素纳米纤维的酶修饰以提高耐热性和降低亲水性
纤维素纳米纤维(CNFs)是一种极具发展前景的新型材料,其宽度为3 ~ 100nm。CNFs因其重量轻、强度高、表面积大等优点而受到广泛关注。然而,提高热稳定性是CNFs应用中的一个挑战。通常,CNFs含有微量物质,如半纤维素,其热降解温度比纤维素低。因此,半纤维素可以降低CNFs的热降解温度。为了通过去除半纤维素来提高CNFs的热稳定性,对商用CNFs进行了几种纤维素酶和半纤维素酶的处理,并通过热重分析对其进行了评价。结果表明,木聚糖酶处理1 h可提高CNFs的热解温度。接下来,研究了酶处理的CNFs的基本薄片性质。酶处理后CNF膜的拉伸强度降低,但接触角增加。这些结果表明,生物质降解酶处理降低了CNFs表面的亲水性。
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来源期刊
Cellulose
Cellulose 工程技术-材料科学:纺织
CiteScore
10.10
自引率
10.50%
发文量
580
审稿时长
3-8 weeks
期刊介绍: Cellulose is an international journal devoted to the dissemination of research and scientific and technological progress in the field of cellulose and related naturally occurring polymers. The journal is concerned with the pure and applied science of cellulose and related materials, and also with the development of relevant new technologies. This includes the chemistry, biochemistry, physics and materials science of cellulose and its sources, including wood and other biomass resources, and their derivatives. Coverage extends to the conversion of these polymers and resources into manufactured goods, such as pulp, paper, textiles, and manufactured as well natural fibers, and to the chemistry of materials used in their processing. Cellulose publishes review articles, research papers, and technical notes.
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