Correlation between parameters of swelling kinetic with network and hydrophilic characteristics of polyacrylamide and methylcellulose hydrogels

Quimica nova

Mattoso, Luiz H. C.¹  Vaz, Carlos M. P.¹  Muniz, Edvani C.²  Aouada, Fauze A.³ 

[1] Embrapa Instrumentação Agropecuária, São Carlos, Brasil;Universidade Estadual de Maringá, Maringá, Brasil;Universidade Federal de São Carlos, São Carlos, Brasil

关键词: hydrogels;    kinetic properties;    structural properties.;   

DOI  :  10.1590/S0100-40422009000600023

学科分类：化学（综合）

来源: Sociedade Brasileira de Quimica

【 摘 要 】

In this paper,the effects of acrylamide (AAm), methylcellulose (MC) contents, pH and ionicstrength on kinetic, network and hydrophilic properties of polyacrylamide andmethylcellulose hydrogels were investigated. The hydrogels were characterizedby evaluating of network [average molecular weight between crosslinks (MC),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 controlledby adjusting of the AAm, MC contents, pH and ionic strength factors. Due tohigh hydrophilicity and fast water-uptake, the PAAm-MC hydrogels can be consideredas materials for potential applications in agricultural fields, mainly in controlledrelease of water or pesticides.

【 授权许可】

CC BY