Portal de Periódicos da CAPES

Glass transition of rigid polyurethane foams derived from sodium lignosulfonate mixed with diethylene, triethylene and polyethylene glycols

2004; Elsevier BV; Volume: 416; Issue: 1-2 Linguagem: Inglês

10.1016/j.tca.2002.12.002

1872-762X

Tetsuo Hatakeyama, Yukio Matsumoto, Yasuhiro Asano, Hiromitsu Hatakeyama,

Polymer composites and self-healing

Sodium salt of lignosulfonic acid (LS), which was obtained as a by-product of cooking process in sulfite pulping, was solved in diethylene-, triethylene or polyethylene glycol. Three series of polyurethane foams (LSPU) were synthesized by varying the LS content from 0 to 33 wt.%. Thermal properties of LSPU foams were studied by thermomechanometry (TMA) and differential scanning calorimetry (DSC). Main glass transition was observed in a temperature ranging from 80 to 140 °C. Glass transition temperature (Tg) increased with increasing LS content and with decreasing oxyethylene chain length. Tg values obtained by TMA accorded well with those by DSC.