Correlação entre parâmetros da cinética de intumescimento com características estruturais e hidrofílicas de hidrogéis de poliacrilamida e metilcelulose


Autoria(s): Aouada,Fauze A.; Muniz,Edvani C.; Vaz,Carlos M. P.; Mattoso,Luiz H. C.
Data(s)

01/01/2009

Resumo

In this paper, the effects of acrylamide (AAm), methylcellulose (MC) contents, pH and ionic strength on kinetic, network and hydrophilic properties of polyacrylamide and methylcellulose hydrogels were investigated. The hydrogels were characterized by evaluating of network [average molecular weight between crosslinks (M C), crosslink density (q) and the number of elastically effective chains (Ve)], and kinetic parameters [diffusional exponent (n), diffusion constant (k) and diffusion coefficient (D)]. Such properties were controlled by adjusting of the AAm, MC contents, pH and ionic strength factors. Due to high hydrophilicity and fast water-uptake, the PAAm-MC hydrogels can be considered as materials for potential applications in agricultural fields, mainly in controlled release of water or pesticides.

Formato

text/html

Identificador

http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-40422009000600023

Idioma(s)

pt

Publicador

Sociedade Brasileira de Química

Fonte

Química Nova v.32 n.6 2009

Palavras-Chave #hydrogels #kinetic properties #structural properties
Tipo

journal article