一种使用聚甲基氢硅氧烷对纳米纤维素晶须进行疏水改性的高效、经济且超快的方法。

An Effective, Economical and Ultra-Fast Method for Hydrophobic Modification of NCC Using Poly(Methylhydrogen)Siloxane.

作者信息

You Xueqing, Hu Qingjian, Hu Xiaoyong, Chen Hanxian, Yang Wenbin, Zhang Xinxiang

机构信息

College of Material Engineering, Fujian Agriculture and Forestry University, Fuzhou 350002, China.

出版信息

Polymers (Basel). 2019 Jun 3;11(6):963. doi: 10.3390/polym11060963.

DOI:10.3390/polym11060963

PMID:31163595

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC6630631/

Abstract

Poor compatibility between nanocellulose crystals (NCCs) and major polymers has limited the application of NCC as bio-reinforcements. In this work, an effective and ultra-fast method was investigated to significantly improve the hydrophobicity of NCC by using poly(methylhydrogen)siloxane (PMHS) as modifier. PMHS possessed amounts of reactive -Si-H groups and hydrophobic -CH groups. The former groups were reactive with the hydroxyl groups of NCC, while the latter groups afforded NCC very low surface energy. As the weight ratio of PMHS to NCC was only 0.0005%, the hydrophobicity of NCC was significantly improved by increasing the water contact angle of NCC from 0° to 134°. The effect of weight ratio of PMHS to NCC and the hydrogen content of -Si-H in PMHS on the hydrophobicity and thermal stability was investigated in detail by Fourier transform infrared spectroscopy (FTIR), (X-ray Diffraction) XRD and (thermogravimetric analysis) TGA. The results indicated that PMHS chains were covalently grafted onto NCC and PMHS modification improved the thermal stability of NCC.

摘要

纳米纤维素晶体（NCCs）与主要聚合物之间的相容性较差，限制了NCC作为生物增强剂的应用。在这项工作中，研究了一种有效且超快的方法，通过使用聚甲基氢硅氧烷（PMHS）作为改性剂来显著提高NCC的疏水性。PMHS含有大量的活性-Si-H基团和疏水性-CH基团。前者与NCC的羟基反应，而后者赋予NCC极低的表面能。由于PMHS与NCC的重量比仅为0.0005%，通过将NCC的水接触角从0°增加到134°，NCC的疏水性得到了显著改善。通过傅里叶变换红外光谱（FTIR）、X射线衍射（XRD）和热重分析（TGA）详细研究了PMHS与NCC的重量比以及PMHS中-Si-H的氢含量对疏水性和热稳定性的影响。结果表明，PMHS链共价接枝到NCC上，并且PMHS改性提高了NCC的热稳定性。