Time-triggered calcium ion bridging in preparation of films of oxidized microfibrillated cellulose and pulp

Pegah Khanjani; Matti Ristolainen; Harri Kosonen; Pasi Virtanen; Sara Ceccherini; Thaddeus Maloney; Tapani Vuorinen

doi:10.1016/j.carbpol.2019.04.060

Time-triggered calcium ion bridging in preparation of films of oxidized microfibrillated cellulose and pulp

Pegah Khanjani^*, Matti Ristolainen, Harri Kosonen, Pasi Virtanen, Sara Ceccherini, Thaddeus Maloney, Tapani Vuorinen

^*Corresponding author for this work

Research output: Contribution to journal › Article › Scientific › peer-review

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Abstract

One of the main trends in developing bio-based materials is to improve their mechanical and physical properties using MFC derived from sustainable natural sources and compatible low-cost chemicals. The strength of anionic MFC based materials can be increased with addition of multivalent cations. However, direct mixing of solutions of multivalent cations with oxidized MFC may result in immediate, uncontrollable fibril aggregation and flock formation. The aim of this study was to design a method where Ca ²⁺ ions liberate from solid CaCO ₃ particles on bleached hardwood (birch) kraft pulp, which was mixed with oxidized MFC and crosslink it to tailor the mechanical properties of the dried structure. In few minutes after adding acetic anhydride, pH of the wet film dropped from 7.3–4.8 through liberation of acetic acid and CaCO ₃ particles solubilized releasing Ca ²⁺ . The novel method could be applied on industrial scale for improving the performance of packaging materials.

Original language	English
Pages (from-to)	63-67
Number of pages	5
Journal	Carbohydrate Polymers
Volume	218
DOIs	https://doi.org/10.1016/j.carbpol.2019.04.060
Publication status	Published - 15 Aug 2019
MoE publication type	A1 Journal article-refereed

Keywords

Acetic anhydride
Bleached hardwood kraft pulp
Cellulose film
Oxidized microfibrillated cellulose
Precipitated calcium carbonate
Tensile testing

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10.1016/j.carbpol.2019.04.060Licence: CC BY

CHEM-Khanjani Maloney Vuorinen etal-Time-triggered-2019-CarboPolyFinal published version, 1.31 MBLicence: CC BY

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title = "Time-triggered calcium ion bridging in preparation of films of oxidized microfibrillated cellulose and pulp",

abstract = " One of the main trends in developing bio-based materials is to improve their mechanical and physical properties using MFC derived from sustainable natural sources and compatible low-cost chemicals. The strength of anionic MFC based materials can be increased with addition of multivalent cations. However, direct mixing of solutions of multivalent cations with oxidized MFC may result in immediate, uncontrollable fibril aggregation and flock formation. The aim of this study was to design a method where Ca 2+ ions liberate from solid CaCO 3 particles on bleached hardwood (birch) kraft pulp, which was mixed with oxidized MFC and crosslink it to tailor the mechanical properties of the dried structure. In few minutes after adding acetic anhydride, pH of the wet film dropped from 7.3–4.8 through liberation of acetic acid and CaCO 3 particles solubilized releasing Ca 2+ . The novel method could be applied on industrial scale for improving the performance of packaging materials. ",

keywords = "Acetic anhydride, Bleached hardwood kraft pulp, Cellulose film, Oxidized microfibrillated cellulose, Precipitated calcium carbonate, Tensile testing",

author = "Pegah Khanjani and Matti Ristolainen and Harri Kosonen and Pasi Virtanen and Sara Ceccherini and Thaddeus Maloney and Tapani Vuorinen",

year = "2019",

month = aug,

day = "15",

doi = "10.1016/j.carbpol.2019.04.060",

language = "English",

volume = "218",

pages = "63--67",

journal = "Carbohydrate Polymers",

issn = "0144-8617",

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Time-triggered calcium ion bridging in preparation of films of oxidized microfibrillated cellulose and pulp. / Khanjani, Pegah; Ristolainen, Matti; Kosonen, Harri; Virtanen, Pasi; Ceccherini, Sara ; Maloney, Thaddeus ; Vuorinen, Tapani.

In: Carbohydrate Polymers, Vol. 218, 15.08.2019, p. 63-67.

Research output: Contribution to journal › Article › Scientific › peer-review

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AU - Khanjani, Pegah

AU - Ristolainen, Matti

AU - Kosonen, Harri

AU - Virtanen, Pasi

AU - Ceccherini, Sara

AU - Maloney, Thaddeus

AU - Vuorinen, Tapani

PY - 2019/8/15

Y1 - 2019/8/15

N2 - One of the main trends in developing bio-based materials is to improve their mechanical and physical properties using MFC derived from sustainable natural sources and compatible low-cost chemicals. The strength of anionic MFC based materials can be increased with addition of multivalent cations. However, direct mixing of solutions of multivalent cations with oxidized MFC may result in immediate, uncontrollable fibril aggregation and flock formation. The aim of this study was to design a method where Ca 2+ ions liberate from solid CaCO 3 particles on bleached hardwood (birch) kraft pulp, which was mixed with oxidized MFC and crosslink it to tailor the mechanical properties of the dried structure. In few minutes after adding acetic anhydride, pH of the wet film dropped from 7.3–4.8 through liberation of acetic acid and CaCO 3 particles solubilized releasing Ca 2+ . The novel method could be applied on industrial scale for improving the performance of packaging materials.

AB - One of the main trends in developing bio-based materials is to improve their mechanical and physical properties using MFC derived from sustainable natural sources and compatible low-cost chemicals. The strength of anionic MFC based materials can be increased with addition of multivalent cations. However, direct mixing of solutions of multivalent cations with oxidized MFC may result in immediate, uncontrollable fibril aggregation and flock formation. The aim of this study was to design a method where Ca 2+ ions liberate from solid CaCO 3 particles on bleached hardwood (birch) kraft pulp, which was mixed with oxidized MFC and crosslink it to tailor the mechanical properties of the dried structure. In few minutes after adding acetic anhydride, pH of the wet film dropped from 7.3–4.8 through liberation of acetic acid and CaCO 3 particles solubilized releasing Ca 2+ . The novel method could be applied on industrial scale for improving the performance of packaging materials.

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KW - Oxidized microfibrillated cellulose

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KW - Tensile testing

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Time-triggered calcium ion bridging in preparation of films of oxidized microfibrillated cellulose and pulp

Abstract

Keywords

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