期刊
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
卷 5, 期 8, 页码 7439-7447出版社
AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.7b02033
关键词
Poly(N-vinylcaprolactam); Thermally induced phase transition; Cellulose nanocrystals; Atom transfer radical polymerization; Temperature responsive polymer
资金
- Louisiana Board of Regents [LEQSF(2015-17)-RD-B-01, LEQSF(2016-2017)-ENH-TR-01, LEQSF(2017-2018)-RD-A-01]
- Louisiana State University EDA program
- Korea National Institute of Forest Science
- National Institute of Forest Science (NIFOS), Republic of South Korea [FP0400-2016-01-2017] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
A novel thermoresponsive copolymer poly(N-vinylcaprolactam) grafted cellulose nanocrystals (PVCL-g-CNCs) was synthesized using surface-initiated atom transfer radical polymerization, and its temperature responsive behavior was studied in this work. The chemical structure characterization by Fourier transform infrared spectroscopy, solid-state CP/MAS C-13 NMR spectroscopy, and X-ray photoelectron spectroscopy confirmed the presence of covalently grafting PVCL chains on the CNC surface. The crystalline structure and nanorod-shaped morphology of CNCs were well preserved after polymerization. Transmission electron microscope results indicated that the surface of CNCs was covered with grafted PVCL brushes. The viscoelastic properties of PVCL-g-CNC aqueous suspensions (1.0 wt %) by dynamic rheology measurements confirmed the thermally induced phase transition behavior. The work presented herein paves the way to design CNC-based advanced functional materials benefiting both from the intrinsic characteristics of CNCs and the new properties imparted by the temperature sensitive grafted polymer chains.
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