Synthesis, characterization and qualitative assessment of self-healing capacity of PU microcapsules containing TDI and IPDI as a core agent

Publication date: Available online 14 October 2019Source: Materials Today CommunicationsAuthor(s): Vinicius Henrique de Souza Rodrigues, Alexandre Estêvão Carrara, Sabrina Sara Rossi, Leandro Mattos Silva, Rita de Cássia Lazzarini Dutra, Jorge Carlos Narciso DutraAbstractThis paper shows the results obtained during the synthesis, characterization and self-healing qualitative capacity assessment microcapsules made of polyurethane (PU) shell, a product of emulsion polymerization reaction between diphenylmethane diisocyanate (MDI) and 1,4-butanediol, and within it, as the "encapsulated" self-healing agent, toluene diisocyanate (TDI) or isophorone diisocyanate (IPDI). Microcapsules synthesis and self-healing agent encapsulation were possible due to the difference of diisocyanates reactivity applied in the process, while its self-healing capacity was achieved by the interaction between encapsulated agent (TDI and IPDI) with active groups present in the epoxy matrix. The characterization was performed by means of experimental techniques such as: Universal Attenuated Total Reflection in the middle infrared region (FT-MIR / UATR), Scan Differential Calorimetry (DSC), Optical Microscopy (OM), Scanning Electron Microscopy (SEM) and Thermogravimetric Analysis (TGA) to monitor the synthesis, morphology and thermal stability of the microcapsules. Self-healing qualitative capacity was evaluated through dynamometric test to monitor its effectiveness when it is added in a proportion of 5%...
Source: Materials Today Communications - Category: Materials Science Source Type: research