Surfactant and Counter-Ion Distribution in Styrene-Butyl Acrylate-Acrylic Acid Dry Latex Submonolayers
نویسندگان
چکیده
Submonocamadas de látex estireno-acrílico preparado usando um tensoativo sulfonato reativo e um tensoativo fosfato não-reativo foram examinadas em um microscópio de transmissão equipado com um espectrômetro de perda de energia de elétrons, para a aquisição de mapas de distribuição elementar. P está ausente do centro das partículas mas é encontrado em uma casca espessa, no fundo da imagem e em estruturas incomuns com um baixo teor de carbono, enquanto S está uniformemente distribuído nas partículas. Os mapas elementares de Na e N mostram que os respectivos cátions (Na, NH 4 ) têm diferentes distribuições: o sinal de Na é mais intenso nas partículas do que no fundo, enquanto N se acumula nas bordas das partículas. As distribuições de tensoativos e contraíons são portanto diferentes de algumas suposições correntes, mas elas estão de acordo com resultados recentes sobre a distribuição de constituintes iônicos em látex, obtidas por microscopia de varredura de potencial elétrico.
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