竹粉接枝改性及其对竹粉/PETG复合材料流变行为的影响

Grafting modification of bamboo flour and its effect on the rheological behavior of bamboo flour/PETG composites

采用电子活化再生原子转移自由基聚合(AGET ATRP)法将甲基丙烯酸甲酯(MMA)接枝到竹粉(BF)表面,并采用哈克微量混合流变仪及旋转流变仪考察了竹粉接枝改性前后对竹粉/聚对苯二甲酸乙二醇酯-1,4-环己烷二甲醇酯(PETG)复合材料流变行为的影响。毛细管流变结果表明,竹粉/PETG复合材料属于假塑性流体,呈现剪切变稀的现象;应变扫描结果表明,与未改性竹粉/PETG复合材料体系相比,竹粉经接枝改性后其复合材料体系在更大的应变范围内属于线性弹性行为;频率扫描结果表明,竹粉的接枝改性处理有助于促进竹粉在PETG基体中的均匀分散。

Methyl methacrylate(MMA)was grafted onto bamboo flour(BF)surface via the method of atom transfer radical polymerization with activators generated by electron transfer(AGET ATRP).The effects on the rheological behavior of BF/polyethylene terephthalate glycol(PETG)composite before and after being grafted by BF were investigated using haake minilabⅡ rheometer and rotate rheometer.The capillary rheometer results show that BF/PETG composites display pseudo plastic fluid,and all specimens exhibit shear thinning behavior.Strain scanning results show that compared to that without modification,the stain range of the linear visco-elastic zone of BF/PETG composites with graft modification of BF becomes wider;The frequency scan results indicate that graft modification of BF can accelerate the dispersion of BF into PETG matrix.