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Hydrophobic Modification of Nanocellulose via a Two-Step Silanation Method
Wensheng Lin1, Xiaoyong Hu2, Xueqing You3
1College of Materials Engineering, Fujian Agriculture and Forestry University, Fuzhou 350002, China. wensheng0817@163.com.
Polymers
|April 10, 2019
Summary
Dodecyltrimethoxysilane (DTMOS) was grafted onto nanocellulose crystals (NCC) using KH560 as a linker, significantly enhancing NCC
Area of Science:
- Materials Science
- Surface Chemistry
Background:
- Nanocellulose crystals (NCC) are hydrophilic, limiting their applications in hydrophobic environments.
- Surface modification of NCC is crucial for tailoring its properties for advanced material applications.
Purpose of the Study:
- To improve the hydrophobicity and thermal stability of nanocellulose crystals (NCC).
- To investigate the grafting mechanism of Dodecyltrimethoxysilane (DTMOS) onto NCC using KH560 as a linker.
Main Methods:
- A two-step grafting method involving KH560 (ɤ-(2,3-epoxyproxy)propytrimethoxysilane) and DTMOS.
- Surface characterization using Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), and HCl-acetone titration.
Main Results:
- Successful covalent grafting of KH560 and DTMOS onto NCC surface confirmed by spectroscopic and titration methods.
- Significant increase in hydrophobicity of NCC, evidenced by a water contact angle increase from 0° to approximately 140°.
- Enhanced thermal stability of the DTMOS-modified NCC.
Conclusions:
- The two-step grafting method effectively imparts hydrophobicity to NCC using DTMOS and KH560.
- Modified NCC exhibits improved surface properties and thermal stability, broadening its potential applications.
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