Cunha Ana G, Freire Carmen S R, Silvestre Armando J D, Neto Carlos Pascoal, Gandini Alessandro, Orblin Elina, Fardim Pedro
CICECO and Department of Chemistry, University of Aveiro, Campus de Santiago, 3810-193 Aveiro, Portugal.
J Colloid Interface Sci. 2007 Dec 15;316(2):360-6. doi: 10.1016/j.jcis.2007.09.002. Epub 2007 Sep 7.
The controlled heterogeneous modification of cellulose fibers with trifluoroacetic anhydride was investigated. The characterization of the ensuing materials was performed by elemental analysis, FTIR spectroscopy, X-ray diffraction (XRD), thermogravimetry, and surface analysis (XPS, ToF-SIMS, and contact angles measurements). The trifluoroacetylation enhanced significantly the hydrophobic and lipophobic character of the fibers, whereas their thermal stability and cristallinity were only modestly affected by this treatment, except under the most severe conditions for the latter. Their hydrolytic stability to water vapour was also assessed as a function of the air humidity and shown to be lower than that of still liquid water in the case of a saturated atmosphere.
研究了用三氟乙酸酐对纤维素纤维进行可控的非均相改性。通过元素分析、傅里叶变换红外光谱（FTIR）、X射线衍射（XRD）、热重分析和表面分析（X射线光电子能谱、飞行时间二次离子质谱和接触角测量）对所得材料进行了表征。三氟乙酰化显著增强了纤维的疏水和亲脂特性，而它们的热稳定性和结晶度仅受到这种处理的适度影响，在最苛刻的条件下对后者的影响除外。还评估了它们对水蒸气的水解稳定性与空气湿度的关系，结果表明在饱和气氛下，其水解稳定性低于液态水。
