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Biodegradable polymers such as poly(butylene adipate-coterephthalate)(PBAT) have attracted great interest as alternatives to traditional petroleum-based polymers. Nonetheless, it is necessary to improve some properties of PBAT, such as mechanical strength. Cellulose nanofiber(CNF) can improve PBAT mechanical strength, but its dispersion and compatibility in the PBAT matrix require further improvement. In this study, octadecylamine(ODA) was utilized to graft-modify CNF to change the fiberto-fiber interaction and improve its compatibility with the PBAT matrix.PBAT composites with 1 wt% CNF were prepared using a masterbatch premixing method to avoid CNF aggregation during extrusion. The effects of ODA graft modification on CNF properties were studied; varying degrees of CNF modification were investigated for their effect on PBAT properties. ODA-modified CNF(OCNF)/PBAT melt-extruded composites possessing17.2% higher tensile strength than pure PBAT polymer were obtained without affecting the thermal stability of PBAT. As a result, surface modification of CNF with ODA is an effective strategy for improving CNF-PBAT compatibility.


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Octadecylamine Graft-modified Cellulose Nanofiber and Its Reinforcement to Poly(butylene adipate-co-terephthalate) Composites

Show Author's information Leilei Hou1,2Jinghuan Chen1,2( )Jingang Liu1,2( )
China National Pulp and Paper Research Institute Co., Ltd., Beijing, 100102, China
National Engineering Lab for Pulp and Paper, Beijing, 100102, China

Abstract

Biodegradable polymers such as poly(butylene adipate-coterephthalate)(PBAT) have attracted great interest as alternatives to traditional petroleum-based polymers. Nonetheless, it is necessary to improve some properties of PBAT, such as mechanical strength. Cellulose nanofiber(CNF) can improve PBAT mechanical strength, but its dispersion and compatibility in the PBAT matrix require further improvement. In this study, octadecylamine(ODA) was utilized to graft-modify CNF to change the fiberto-fiber interaction and improve its compatibility with the PBAT matrix.PBAT composites with 1 wt% CNF were prepared using a masterbatch premixing method to avoid CNF aggregation during extrusion. The effects of ODA graft modification on CNF properties were studied; varying degrees of CNF modification were investigated for their effect on PBAT properties. ODA-modified CNF(OCNF)/PBAT melt-extruded composites possessing17.2% higher tensile strength than pure PBAT polymer were obtained without affecting the thermal stability of PBAT. As a result, surface modification of CNF with ODA is an effective strategy for improving CNF-PBAT compatibility.

Keywords: cellulose nanofiber, compatibility, octadecylamine, glutaraldehyde, PBAT

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Publication history

Received: 08 March 2022
Accepted: 28 March 2022
Published: 25 July 2022
Issue date: July 2022

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© 2022 Paper and Biomaterials

Acknowledgements

The authors are grateful for financial support from the National Key Research and Development Program of China (Grant Nos. 2017YFB0307901 and 2017YFE0102500).

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This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/)

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