竹纤维接枝丙烯酸接枝物的制备及其性能研究

Preparation and performance of bamboo fiber grafted acrylic acid copolymer

分别通过X射线衍射仪(XRD)、扫描电子显微镜(SEM)、红外光谱(FT-IR)及热重分析仪(TG)研究不同丙烯酸用量、引发剂用量、反应温度及反应时间对竹纤维接枝丙烯酸接枝物的结构、形貌、热性能及接枝率的影响。不同条件下的接枝物接枝率变化明显,以竹纤维和丙烯酸质量比为1∶5、引发剂质量分数为1.0%、反应温度为70℃及反应时间为4h的接枝率最适合,为0.675。FT-IR、XRD及SEM结果表明接枝物已成功制备,曲线特征峰均向右偏移,特征峰宽度变大;衍射峰位置发生明显偏移,衍射峰强度明显降低;改性前竹纤维表面较光滑,改性后的接枝物相互缠绕和渗透,表面变得粗糙,出现许多细小孔洞。TG显示接枝物热稳定性提高了甚至发生交联。

The influence of the acrylic acid content,initiator content,reactive temperature and reactive time on the structure,phase morphology,thermal property and grafting ratio of copolymer of acrylic acid grafted onto bamboo fiber were investigated by XRD,SEM,FT-IR and TG etc.There was a sharp shift for the grafting rate of copolymer at different condition,for resulting in the optimum grafting ratio of 0.675,which was explored at the concentration of initiator was 1.0（wt）%,the mass ratio of bamboo fiber and acrylic acid at 1∶5,the reactive temperature at 70℃and the reactive time at 4 h.FT-IR,XRD and SEM results indicated that the characteristic peaks of FT-IR curve shifted to the right and peaks width were larger.Diffraction peaks position offseted and peaks intensity reduced significantly.Bamboo fiber surface was smooth before modification,while the grafting copolymer surface became rough and appear many tiny holes after modification.TG showed that the thermal stability of grafting copolymer was improved along with the crosslinking.