SciELO - Scientific Electronic Library Online

 
vol.50 número2Synthesis and antibacterial activity of cefotaxime metal complexesSYNTHESIS OF IRON AND IRON-MANGANESE COLLOIDS AND NANOPARTICLES USING ORGANIC SOLVENTS índice de autoresíndice de assuntospesquisa de artigos
Home Pagelista alfabética de periódicos  

Serviços Personalizados

Journal

Artigo

Indicadores

Links relacionados

Compartilhar


Journal of the Chilean Chemical Society

versão On-line ISSN 0717-9707

Resumo

LISPERGUER, JUSTO; DROGUETT, CYNTHIA; RUF, BEATRIZ  e  NUNEZ, MARIO. DIFFERENTIAL SCANNING CALORIMETRY AND DINAMIC MECHANICAL ANALYSIS OF PHENOL-RESORCINOL-FORMALDEHYDE RESINS. J. Chil. Chem. Soc. [online]. 2005, vol.50, n.2, pp.451-453. ISSN 0717-9707.  http://dx.doi.org/10.4067/S0717-97072005000200002.

Differential scanning calorimetry ( DSC ) and dinamic mechanical analysis ( DMA ) were use to study the curing reactions of two phenol - resorcinol- formaldehyde ( PRF ) adhesives with 15 and 25 % resorcinol content, synthesized in laboratory. The PRF resin with lower resorcinol content ( PRF1 ) shows a double exothermic peak ( 99.9 and 158.2 °C ) while PRF2 ,with greater resorcinol content ( 25 %) shows only one peak at 93.9 °C. The DMA storage modulus E' confirm the differences in the curing behavior of PRF adhesives. In the delamination resistance test during accelerated exposure only PRF2 with a greater content of resorcinol, fulfilled the ASTM D 2559 requirements for beams treated with two CCA retention levels. The cross-linking reactions was produced in the curing process at lower temperature in PRF2 , enhanced the adhesion durability to glulams treated with CCA preservatives

        · texto em Inglês

 

Creative Commons License Todo o conteúdo deste periódico, exceto onde está identificado, está licenciado sob uma Licença Creative Commons