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Swelling and mass transport properties of nanocellulose-HPMC composite films

Mikael Larsson (SuMo Biomaterials ; Institutionen för kemi och kemiteknik, Farmaceutisk teknologi) ; Anders Johnsson (Institutionen för kemi och kemiteknik, Farmaceutisk teknologi) ; Sofie Gårdebjer (Institutionen för kemi och kemiteknik, Farmaceutisk teknologi) ; Romain Bordes (Institutionen för kemi och kemiteknik, Teknisk ytkemi ; SuMo Biomaterials) ; Anette Larsson (Institutionen för kemi och kemiteknik, Farmaceutisk teknologi ; SuMo Biomaterials)
Materials & Design (0264-1275). Vol. 122 (2017), p. 414-421.
[Artikel, refereegranskad vetenskaplig]

Composite films were sprayed from mixtures of water soluble hydroxypropyl methylcellulose (HPMC) and either nanofibrillated cellulose (NFC) or cellulose nanocrystals (CNC). Fiber diameter was similar for both nanocelluloses but fiber length was several mu m for NFC and about 200 nm for CNC. Films were characterized for morphology, swelling, mass loss and transport properties. NFC-HPMC films swelled less than CNC-HPMC films; with a HPMC content of 20 wt% NFC-HPMC and CNC-HPMC films presented swelling of 7 and 75 g/g, respectively. The swelling strongly influenced water transport across the films, with slower transport for CNC-based materials compared to NFC-based materials. The properties of NFC-based films were comparable to previous results using microfibrillated cellulose (MFC) with heterogeneous structural content and fiber lengths of similar to 10 mu m. The findings have implications for using nanocellulose to modulate material properties in wet-state applications, with effects being in strong contrast when using as a hardening filler in dry materials.

Nyckelord: Cellulose nanocrystals, Composite films, Controlled release, Microfibrillated cellulose, Nanofibrillated

Denna post skapades 2017-06-07. Senast ändrad 2017-06-30.
CPL Pubid: 249613


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