Studies concerning the accessibility of different allomorphic forms of cellulose |
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Authors: | Diana Ciolacu Luizildo Pitol-Filho Florin Ciolacu |
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Institution: | (1) Laboratory of Physical Chemistry of Polymers, “Petru Poni” Institute of Macromolecular Chemistry, Grigore Ghica Voda Alley, 41A, 700487 Iasi, Romania;(2) Faculty of Engineering, Centro Universit?rio Cat?lica de Santa Catarina, Rua dos Imigrantes 500, Jaragu? do Sul, 89254-430, Brazil;(3) Faculty of Chemical Engineering and Environmental Protection, Natural and Synthetic Polymers Department, “Gheorghe Asachi” Technical University of Iasi, Dimitrie Mangeron Bd., 71, 700050 Iasi, Romania |
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Abstract: | The supramolecular architecture and the morphological structure of cellulose play an important role in its accessibility.
In order to evaluate the effect of the crystalline form of organization on the accessibility, we selected cellulosic materials
with significant variations in the aforementioned characteristics. The assessment of the accessibility of cellulosic materials
was performed experimentally through a water vapor sorption method. The kinetics and the thermodynamic parameters of water
vapor sorption process were determined, and a correlation between the Flory–Huggins interaction parameters and the crystallinity
index was derived. We concluded that the allomorph involving the most accessible crystal surfaces and amorphous regions was
Cellulose II. The correlation of the accessibility values with those of the crystallinity index allowed us to evaluate the
accessibility of the allomorphic forms of cellulose at different crystallinity indexes. The obtained experimental data allowed
us to quantify the accessibility for crystal surfaces and amorphous regions of the different allomorphs in the order Cellulose
II (38%) > Cellulose I (24%) > Cellulose III (10%). |
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