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

Química Nova

Mattoso, Luiz H. C.¹  Aouada, Fauze A.¹  Vaz, Carlos M. P.¹  Universidade Federal de São Carlos, São Carlos, Brasil¹  Muniz, Edvani C.¹  Embrapa Instrumentação Agropecuária, São Carlos, Brasil¹  Universidade Estadual de Maringá, Maringá, Brasil¹ 

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 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 (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 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.

【 授权许可】

Unknown