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  • 1 Universidade Federal do Piauí Química Bom Jesus Piauí 64900-000 Brazil
  • 2 UFMA Departamento de Química São Luiz Maranhão 65080-540 Brazil
  • 3 University of Campinas, UNICAMP Institute of Chemistry P.O. Box 6154 Campinas SP 13084-971 Brazil
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Abstract  

Cellulose was chemically modified with SOCl2 to obtain chlorodeoxycellulose, followed by a reaction that gave bonded ethylene-1,2-diamine (en), producing 6-(2′-aminoethylamino)-6-deoxycellulose. The reactions were carried out without the presence of solvent, in water or in N,N′-dimethylformamide, in which the highest amount of amino compound was incorporated onto the biopolymer backbone. The X-ray diffraction patterns for the chlorodeoxycellulose indicate new crystallinities that result from hydrogen bonds established through bonded chorine atoms and the remaining hydroxyl groups, while all the aminodeoxycelluloses were amorphous compounds. Thermal stabilities, for all aminated celluloses gave lower final mass losses than for the chlorinated biopolymer, whose value is lower than unmodified cellulose.

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