SciELO - Scientific Electronic Library Online

 
vol.24 número3Fotodegradação de hidrogel de poliacrilamida na presença de substâncias químicas para o uso na agriculturaEfeito dos ácidos itacônico e fumárico na copolimerização em emulsão do estireno com acrilato de n-butila para produção de argamassa cimentícia índice de autoresíndice de assuntospesquisa de artigos
Home Pagelista alfabética de periódicos  

Serviços Personalizados

Journal

Artigo

Indicadores

Links relacionados

Compartilhar


Matéria (Rio de Janeiro)

versão On-line ISSN 1517-7076

Resumo

CAMPOS, Laura Alves et al. Influence of the hydroxypropyl acrylate and hydroxypropyl methacrylate monomer concentration on the emulsion copolymerization of styrene with n-butyl acrylate and acrylonitrile to produce adhesives. Matéria (Rio J.) [online]. 2019, vol.24, n.3, e12408.  Epub 16-Set-2019. ISSN 1517-7076.  https://doi.org/10.1590/s1517-707620190003.0723.

Hydroxyl acrylic monomers are important because the hydroxyl group present in the molecule can react with isocyanate groups, conferring better mechanical properties to the final polymer when applied onto some substrates. The aim of this work was to study the effects of the hydroxypropyl acrylate (HPA) and hydroxypropyl methacrylate (HPMA) monomer concentration on the emulsion polymerization of styrene (St) with n-butyl acrylate (ABu) and acrylonitrile (ACN). The goal of this work was to obtain latexes with higher concentrations of hydroxyl groups, ideal for reacting with isocyanate, without generating residues or coagulum. Latexes with different amounts of HPA and HPMA (0,3,5,7 e 10 wt%) were obtained and characterized with respect to solids content, viscosity, particle diameter, particle size distribution, freeze-thaw stability, minimum film forming temperature, coagulum formation, hardness and colloidal stability. The results show that the increased HPMA concentration affected the colloidal properties of the latexes. Among the concentrations of HPMA studied, it was possible to obtain latex with a maximum concentration of 5% HPA and 7% HPMA, whereas latex produced with 10% HPA and HPMA had low colloidal stability. Adhesives was obtained by mixing styrene-acrylic hydroxylated latex with a blocked poly(isocyanate) dispersion and characterized.

Palavras-chave : Emulsion polymerization; hydroxylated latex; hydroxypropyl acrylate; hydroxypropyl methacrylate; blocked isocyanate.

        · resumo em Português     · texto em Português     · Português ( pdf )