聚丙烯酸甲酯接枝改性纳米纤维素

Modification of Nano-Crystalline Cellulose by Grafting with Poly(methyl acrylate)

利用羰基二咪唑(CDI)的高活性活化纳米纤维素(NCC),使NCC表面带有高反应活性的碳碳双键。再以2-溴异丁酸乙酯为引发剂,铜丝为催化剂,制备出低分子量的聚丙烯酸甲酯(PMA)。然后采用活性自由基聚合将PMA接枝到活化的NCC表面,制备出PMA接枝改性的NCC。采用凝胶渗透色谱测定合成的PMA的分子量及分子量分布;通过傅立叶变换红外光谱及X射线衍射分析等测试方法对改性前后的NCC的结构和性能进行了分析。实验结果表明,通过单电子转移活性自由基聚合法合成的PMA分子量为2 000,分子量分布窄(分布指数为1.14),并且其成功接枝到NCC表面。

Nano-crystalline cellulose（NCC） was activated by CDI to make NCC surface covered with high active double bonds.---Poly（methyl acrylate）（PMA） with low molecular weight was synthesized by using EBiB as a initiator,Cu as a catalyst. Then PMA was grafted onto the surface of activated NCC,and modified NCC was obtained. The molecular weight and its distribution of PMA were measured by GPC;FTIR and XRD were used to characterize the structure and properties of NCC and modified NCC. The results show that the molecular weight of PMA is 2 000 with the distribution being 1.14,and PMA is grafted to the surface of NCC successfully.