马来酸酐熔融接枝醋酸纤维素的研究

Study of Melt Graft Modification of Cellulose Acetate by MAH

以醋酸纤维素(CA)为基体树脂,过氧化二异丙苯(DCP)为引发剂,马来酸酐(MAH)为接枝单体,在双螺杆挤出机中于175～200℃进行熔融接枝.以红外光谱表征法确定了接枝反应的发生,研究了引发剂、接枝单体用量对接枝反应的影响,并研究了接枝单体及其用量对接枝CA材料热稳定性能、流变性能的影响.结果表明:引发剂DCP添加量为0.4%时接枝率最高;随着MAH添加量的增加,接枝率随之增加;CA-g-MAH较纯CA的热稳定性有所提高,熔体黏度下降,熔体流动速率提高.

The melt graft of maleic anhydride （MAH）onto cellulose acetate（CA）was studied. The grafting reaction was initiated by DCP in a twin screw extruder at 175 - 200 ℃. IR spectra showed that the grafting reaction had occurred. The effects of DCP and amount of MAH on the reaction were studied. The effects of MAH and its amounts on the thermal stability and rheological behavior of grafted CA were studied. The results showed that grafting rate was highest when the amounts of DCP was 0.4%. And the grafting rate was higher when the amount of MAH was higher. The thermal stability of CA-g- MAH was better than CA＇s. The melt viscosity of CA-g-MAH was lower and the MFR was higher.