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Crosslinking as an Efficient Tool for Decreasing Moisture Sensitivity of Biobased Nanocomposite Films

Materials Sciences and Applications 2011年第5期2卷 346-354页

作者： Jari Vartiainen ali harlin 不详

Chitosan-nanoclay bio-hybrid films were successfully crosslinked with glutaraldehyde, genipin and glyoxal. Moisture sensitivity of films decreased as a result of crosslinking which led to improved barrier properties against water vapor and oxygen. Films containing chitosan (6.6 g/m2) with genipin (3.3 g/m2) and nanoclay (6.6 g/m2) had water vapor transmission rate of 72 g × 100 μm/(m2 × 24 h) which was 34% lower as compared to pure chitosan and 30% lower as compared to chitosan/nanoclay without crosslinkers. Glyoxal induced crosslinking resulted in 92% reduction in oxygen transmission rate at 80% relative humidity as compared to pure chitosan films. Oxygen transmission through glyoxal (3.3 g/m2) treated chitosan/nanoclay film was 2.8 cm3 × 100 μm/(m2 × 24 h) which was 53% lower as compared to chitosan/nanoclay without crosslinkers. In addition, nanoclay and especially glyoxal crosslinking prevented the water vapor sorption of chitosan considerably. Crosslinking may be used as an efficient tool for enhancing the exploitability of naturally hydrophilic biopolymers towards new high-value applications, such as food packaging.

关键词： Chitosan Nanoclay Crosslinking Barrier Packaging Glutaraldehyde Genipin Glyoxal

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Simulation of Structural Characteristics and Depth Filtration Elements in Interconnected Nanofibrous Membrane Based on Adaptive Image Analysis

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World Journal of Nano Science and Engineering 2013年第1期3卷 6-16页

作者： Mohammad Kazemi Pilehrood Pirjo Heikkila ali harlin VTT Technical Research Centre of Finland EspooFinland

Due to their unique structural features, electrospun membranes have gained considerable attention for use in applications where quality of depth filtration is a dominant performance factor. To elucidate the depth filtration phenomena it is important to quantify the intrinsic structural properties independent from the dynamics of transport media. Several methods have been proposed for structural characterization of such membranes. However, these methods do not meet the requirement for the quantification of intrinsic structural properties in depth filtration. This may be due to the complex influence of transport media dynamics and structural elements in the depth filtration process. In addition, the different morphological architectures of electrospun membranes present obstacles to precise quantification. This paper seeks to quantify the structural characteristics of electrospun membranes by introducing a robust image analysis technique and exploiting it to evaluate the permeation-filtration mechanism. To this end, a nanostructured fibrous network was simulated as an ideal membrane using adaptive local criteria in the image analysis. The reliability of the proposed approach was validated with measurements and comparison of structural characteristics in different morphological conditions. The results were found to be well compatible with empirical observations of perfect membrane structures. This approach, based on optimization of electrospinning parameters, may pave the way for producing optimal membrane structures for boosting the performance of electrospun membranes in end-use applications.

关键词： Nanofibrous Membrane Image Analysis Local Criteria Structural Characteristics Pore Interconnectivity Depth Filtration

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Biopolymer Films and Coatings in Packaging Applications--A Review of Recent Developments

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Materials Sciences and Applications 2014年第10期5卷 708-718页

作者： Jari Vartiainen Mika Vaha-Nissi ali harlin VTT Technical Research Centre of Finland EspooFinland

This review covers the recent developments in the field of biobased packaging materials. Special emphasis is placed on the barrier properties, which are crucial in terms of food packaging. The state-of-the-art of several biopolymers including pectin, starch, chitosan, xylan, galactoglucomannan, lignin and cellulose nanofibrils is discussed. As in most cases the packaging related properties of single layer biopolymer films are inadequate, the thin film coatings, such as sol-gel and ALD (atomic layer deposition), as well as the multilayer coatings are also briefly touched.

关键词： Biopolymers Packaging Films and Coatings Barrier Properties

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再生纤维素纤维的可持续连续制备工艺

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国际纺织导报 2021年第9期49卷 16-18页

作者： M.Vehviläinen M.Määttänen S.Grönqvist A.harlin M.Steiner R.Kunkel 乔士亚(译) 于俊荣(校) 芬兰VTT技术研究中心(芬兰) List技术公司(瑞士) 不详

目前,纤维素活化和溶解阶段的生产规模有限,严重阻碍了Biocelsol技术生产再生纤维素纤维的商业化。介绍了Biocelsol技术的最新发展,该技术已经能够实现再生纤维素纤维的连续化生产。

关键词：再生纤维素纤维 Biocelsol技术酶促活化溶解

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