Preparation of Thermochromic Films from Latexes Made by Miniemulsion Polymerization

Autor(es)

Espinola Colman, Maria M. ^[1] ; Valdez, Omar Garcia ^[2] ; George, Sean ^[2] ; Cunningham, Michael F. ^[2] ; da Costa Laqua, Leticia Alves ^[3] ; Giudici, Reinaldo ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Escola Politecn, Dept Chem Engn, Ave Prof Luciano Gualberto Travessa 3, 380, BR-05508010 Sao Paulo, SP - Brazil

^[2] Queens Univ, Dept Chem Engn, 19 Div St, Dupuis Hall, Kingston, ON K7L 3N6 - Canada

^[3] Univ Fed Santa Catarina, Dept Chem & Food Engn, Technol Ctr, CP 476, BR-88040970 Florianopolis, SC - Brazil

• Tipo de documento: Artigo Científico
• Fonte: MACROMOLECULAR REACTION ENGINEERING; v. 13, n. 3 JUN 2019.
• Citações Web of Science: 0

Resumo

Thermosensitive-thermochromic pigments are classified as smart materials capable of detecting and/or responding to environmental stimuli, and specifically in this study, changes in temperature that induce a change in the color of the material. This study aims to obtain nanoparticles of poly(styrene-co-butyl acrylate) and poly(styrene-co-methyl methacrylate), containing thermosensitive-thermochromic pigments that are incorporated into the monomer droplets in miniemulsion polymerization. Miniemulsion polymerization has the advantage that the pigment particles can be dispersed directly in the monomer droplets and are encapsulated when the miniemulsion droplets are polymerized. Using controlled/living radical polymerization (or Reversible Deactivation Radical Polymerization), it is possible to produce polymers with better control of microstructure and narrower molecular weight distributions. Nitroxide-mediated polymerization (NMP) is conducted using the BlocBuilder initiator, as well as a conventional free radical polymerization (FRP) using potassium persulfate (KPS) and 2,2-azobis(2-methylpropionitrile) (AIBN). Stable latexes containing the thermosensitive-thermochromic pigments are obtained by both NMP and FRP. Films are made from the latexes and shown to exhibit thermochromic behavior. (AU)

• Processo FAPESP: 13/01648-4 - Encapsulação de pigmentos termocrômicos - termosensíveis pela técnica de Polimerização em Miniemulsão.
• Beneficiário: Maria Magdalena Espinola Colmán
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 14/14619-5 - Encapsulação de pigmentos termocrômicos - termosensíveis pela técnica de polimerização em miniemulsão
• Beneficiário: Maria Magdalena Espinola Colmán
• Modalidade de apoio: Bolsas no Exterior - Estágio de Pesquisa - Pós-Doutorado