Title: Aqueous Polymer Modification of Cellulose Nanofibrils by Grafting‐Through a Reactive Methacrylate Group

Journal Article · · Macromolecular Rapid Communications
 [1];  [1];  [2]; ORCiD logo [3]
  1. Department of Chemistry University of Maine Orono ME 04469 USA
  2. School of Forest Resources University of Maine Orono ME 04469 USA, Advanced Structures and Composites Center University of Maine Orono ME 04469 USA
  3. Department of Chemistry University of Maine Orono ME 04469 USA, Advanced Structures and Composites Center University of Maine Orono ME 04469 USA

Abstract Modifying the surface of cellulose nanofibrils (CNFs) produced by mechanical refinement with a variety of polymer functional groups in an entirely water‐based system is challenging because only surface hydroxyl groups are accessible. To address this limitation, an entirely water‐based, polymer modification scheme is developed. CNFs are functionalized with a reactive methacrylate functional group followed by subsequent grafting‐through polymerization. This modification worked with a variety of water‐soluble and water‐insoluble (meth)acrylates and (meth)acrylamides, grafting up to 45 wt% polymer on to the CNFs. The reaction conditions introducing the methacrylate functional group are adjusted to vary the degree of functionality. Soxhlet extraction of modified samples demonstrates that the reactive methacrylate group is necessary to facilitate polymer grafting. The degree of functionalization of the polymers is studied via quantitative transmission IR spectroscopy and the morphology of the resulting cellulose nanofibrils is studied via a combination of optical, scanning electron, and atomic force microscopy. High levels of polymer modification do not significantly affect the micrometer‐scale fibril morphology.

Sponsoring Organization:
USDOE
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1804799
Journal Information:
Macromolecular Rapid Communications, Journal Name: Macromolecular Rapid Communications Journal Issue: 3 Vol. 42; ISSN 1022-1336
Publisher:
Wiley Blackwell (John Wiley & Sons)Copyright Statement
Country of Publication:
Germany
Language:
English

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