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Preparation of hydrogels with uniform and gradient chemical structures using dialdehyde cellulose and diamine by aerating ammonia gas

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Frontiers of Chemical Science and Engineering 2018年第3期12卷 383-389页

作者： Peiwen Liu carsten mai Kai Zhang Wood Technology and Wood Chemistry Georg-August-Universitat Gottingen 37077 Gottingen Germany Wood Biology and Wood Products Georg-August-Universitat Gottingen 37077 Gottingen Germany

Hydrogels with precisely designed structures represent promising materials with a broad application spectrum, such as for sensor, tissue engineering and biomimetic technology. However, with highly reactive compounds, the preparation of hydrogels still needs an efficient approach for desired distribution of each component within hydrogels. In addition, a method for in situ preparation of gradient hydrogels is still lacking. Herein, we report the formation ofhydrogels with either uniform or gradient internal structures via a novel, simple but very efficient method by aerating ammonia gas （NH3 gas） into the solution of dialdehyde cellulose （DAC） and a diamine. As-prepared hydrogels exhibited uniform microscopic and chemical structure or gradient distribution Of functional groups. Due to lots of aldehyde groups on DAC chains, functional hydrogels can be prepared by using diverse diamines. For instance, hydrogels prepared by using 1,6-hexanediamine as a cross-linker were responsive to pH values. Moreover, this controllable process of aerating NH3 gas allows the in situ formation of gradient hydrogels; for instance, by using cyanamide as a reaction counterpart, gradient hydrogels with gradient distributions of cyanide groups were prepared.

关键词： hydrogel uniform gradient dialdehyde cellulose ammonia gas diamine

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Coating performance on glutaraldehyde-modified wood

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Journal of Forestry Research 2019年第1期30卷 353-361页

作者： Zefang Xiao Haiou Chen carsten mai Holger Militz Yanjun Xie Key Laboratory of Bio-based Material Science and Technology (Ministry of Education) Northeast Forestry University Wood Biology and Wood Products Burckhardt–InstituteGeorg August University of G?ttingen

Scots pine(Pinus sylvestris L.) panels were modified with glutaraldehyde(GA) to various weight percent gains and subsequently coated with several commercial coatings. The drying rate and adhesion of the coatings on the modified wood were measured; the coated/modified woods were exposed outdoors to analyze how the wood modifications influence the coating deterioration. The results showed that GA modification caused an increase in the drying rate of the waterborne coatings, but had no influence on drying of tested solvent-borne coatings. GAmodification did not change the dry adhesion but reduced the wood strength in a pull-off test. Wet adhesion of waterborne coatings was improved, while that of the solvent-borne coatings tended to be somewhat reduced. During 22 months of outdoor weathering, the coated/modified samples exhibited lower moisture content than the coated/unmodified samples, but GA modification didn't contribute a substantially synergistic effect with surface coatings on resistance to weathering.

关键词： Chemical modification Glutaraldehyde Coating Adhesion Weathering

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