聚丙烯腈与改性酶解木质素共混纤维的制备与性能

摘要

Enzymatic hydrolysis lignin(EHL)was modified by grafting copolymerization of acrylonitrile,which was then blended with polyacrylonitrile(PAN)to prepare PAN/PAN-g-EHL blend fibers by solution spinning.A series of testing methods was used to characterize the structure and properties of the resulting fibers.The results showed that polyacrylonitrile was grafted onto EHL successfully.DSC heating curves revealed that the exothermic peak of PAN/PAN-g-EHL blend fibers became weaker and broader,and the exothermic enthalpy decreased significantly. Compared with pure PAN fibers,the tenacity of PAN/PAN-g-EHL blend fibers decreased slightly.It is suggested that the compatibility between PAN and EHL was improved owing to the grafting modification of EHL.Moisture absorption of PAN/PAN-g-EHL blend fibers was also improved greatly.However,PAN/EHL blend fibers exhibited a significant decrease in the tenacity because of the poor compatibility between PAN and EHL,and the defects generated during the coagulating process.%以丙烯腈(AN)为共聚单体,对酶解木质素(EHL)进行接枝共聚改性,得到了改性酶解木质素(PAN-g-EHL),随后将PAN-g-EHL与聚丙烯腈(PAN)共混制备出PAN/PAN-g-EHL共混纤维.对纤维样品进行了结构与性能表征,并与纯PAN 纤维和PAN/EHL共混纤维进行对比.结果表明,聚丙烯腈成功接枝到酶解木质素上,PAN/PAN-g-EHL共混纤维在升温过程中,其放热峰形变宽变弱,放热焓下降.PAN/PAN-g-EHL共混纤维的力学性能与纯PAN纤维相差不大,相容性得到较大改善,吸湿性也得到明显提高.而PAN/EHL共混纤维的力学性能较纯PAN纤维有明显下降,二者之间相容性较差,纤维存在大量的孔洞缺陷.