Controlling the rheology of cellulose dissolved in 4–methylmorpholine N–oxide and tensile properties of precipitated cellulose films via mixture design

IF 4.9 2区工程技术 Q1 MATERIALS SCIENCE, PAPER & WOOD

Cellulose Pub Date : 2024-10-17 DOI:10.1007/s10570-024-06214-y

Pauliina Ahokas, Mikko Mäkelä, Aayush Jaiswal, Alexey Khakalo, Ali Harlin

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Abstract

Properties which control the mechanical performance of regenerated or precipitated cellulose films are currently not well-known and a mechanistic understanding of the underlying phenomena should be established. Solution rheology is a crucial property for casting films and spinning fibres in terms of process runnability, and it can have a considerable effect on the mechanical properties of the prepared cellulose products. We hypothesized that the viscosity of cellulose dissolved in 4-methylmorpholine N-oxide (NMMO) and the mechanical properties of precipitated cellulose films could potentially be improved by controlling the molecular weight distribution of cellulose pulp, taking inspiration from traditional plastic industry. We evaluated the effects of pulp blends on the viscoelastic properties of dissolved cellulose-NMMO dopes and used the dopes to prepare cellulose films and determined their mechanical properties. Lastly, we employed the determined dope and film characteristics to build linear regression models for predicting dope rheology and mechanical performance of films. Mixture films with 2:1 and 1:2 ratios of pulps with both medium and high degree of polymerization showed in average 36% and 46% higher toughness than their unimodal versions. The model results demonstrated that film performance could be tailored by changing the pulp composition. These findings play an important role in optimizing the future processability of dissolved cellulose dopes for producing bio-based cellulose materials and could bring us a step closer to traditional plastic polymer disciplines by tailoring their performance based on pulp properties.

Graphic abstract

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通过混合物设计控制溶于 4-甲基吗啉 N-氧化物的纤维素的流变性和沉淀纤维素薄膜的拉伸性能

目前，控制再生或沉淀纤维素薄膜机械性能的特性还不为人所知，因此应从机制上了解其基本现象。溶液流变性是浇铸薄膜和纺丝纤维工艺运行性能的关键特性，它对制备的纤维素产品的机械性能有相当大的影响。受传统塑料工业的启发，我们假设可以通过控制纤维素浆的分子量分布来提高溶解在 4-甲基吗啉 N-氧化物（NMMO）中的纤维素的粘度和沉淀纤维素薄膜的机械性能。我们评估了纸浆混合物对溶解纤维素-NMMO 掺杂物粘弹性能的影响，并用这些掺杂物制备纤维素薄膜，测定其机械性能。最后，我们利用测定的掺合料和薄膜特性建立了线性回归模型，用于预测掺合料的流变性和薄膜的机械性能。采用 2:1 和 1:2 比例的中高聚合度浆料混合薄膜的韧性比单模薄膜平均高出 36% 和 46% 。模型结果表明，可以通过改变纸浆成分来调整薄膜性能。这些发现对于优化未来生产生物基纤维素材料的溶解纤维素掺杂物的可加工性具有重要作用，并可根据纸浆特性定制其性能，使我们离传统塑料聚合物学科更近一步。

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来源期刊

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.