Abstract:

Cellulose diacetate (CDA) has high melting temperature, and is an important dervative of cellulose. In HAAKE Rheocord, the plasticizing melting systems of cellulose diacetate (CDA)/ ionic liquid 1-ethyl-3-methylimidazolium acetate ([EMIM]Ac) and CDA/ EMIM]Ac/ dimethyl sulfoxide (DMSO) were prepared. The curves of temperature-time and torque-time in the process of two plasticizing melting systems were analyzed respectively. The structures and performances of the plasticizing melting systems were investigated by XRD, TGA and rheometer, respectively. The results show that, [EMIM]Ac is so effective a plasticizer for CDA that the plasticizing melting system of CDA/[EMIM]Ac is a homogeneous one. DMSO insteaded of the part of [EMIM]Ac, which not only can reduce costs, more to promote plasticizing effect of [EMIM]Ac. The melt processing stability of the plasticizing melting system of CDA/[EMIM]Ac and CDA/[EMIM]Ac/DMSO is good because their thermal decomposition temperature is well above their melt flow temperature, although their thermal decomposition temperature are lower than that of raw CDA.

Key words: ionic liquid, demethyl sulfoxide, cellulose diacetate, cellulose diacetate, plasticizing melting