期刊
MACROMOLECULAR RAPID COMMUNICATIONS
卷 42, 期 3, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/marc.202000531
关键词
cellulose nanofibrils; grafting‐ through polymerization; radical polymerization; reactive handles; sustainable materials
资金
- UT-Battelle LLC
- U.S. Department of Energy [DE-AC05-00OR22725, 4000174848]
- USDA Agricultural Research Service (ARS) [58-0204-6-003]
A water-based, polymer modification scheme was developed to modify cellulose nanofibrils with reactive methacrylate functional groups, allowing for the grafting of various (meth)acrylates and (meth)acrylamides. The degree of functionality was adjusted by varying the reaction conditions, and the morphology of the modified nanofibrils was studied using different microscopy techniques. High levels of polymer modification did not significantly alter the microscale fibril morphology.
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.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据