竹纤维酰基化改性对聚丁二酸丁二醇酯复合材料性能的影响

Effect of Acetoxylation of Bamboo Fiber on the Properties of Poly( Butylene Succinate)-Based Composites

对竹纤维(BF)进行酰基化改性,并将其与聚丁二酸丁二醇酯(PBS)共混,研究酰基化改性条件对其力学性能的影响,纤维酰化改性对复合材料的结晶性能和热性能的影响,并结合分子动力学模拟研究了复合材料间的共混相容性。红外光谱分析表明酰基引入了竹纤维中;当竹纤维、乙酸酐和冰乙酸质量比为1∶2.16∶9.18,催化剂用量为竹纤维质量的0.15%,反应时间2h,反应温度50℃时,酰化纤维(Ac-BF)/PBS复合材料具有最优的力学性能,且其结晶性能和热性能均得到提高。分子模拟结果显示,Ac-BF与PBS基体之间的相互作用较强,Flory-Huggins相互作用参数(χ)和共混结合能(Emix)均较低,表明二者之间形成了更稳定的共混体系,酰基化改性有效地改善了复合材料界面相容性,验证了复合材料性能的提高。

The bamboo fiber（ BF） was acetylated and blended with poly（ butylene succinate）（ PBS）. The effects of acetylation condition on mechanical properties,the crystallization properties and thermal properties of bamboo fiber /PBS composites were investigated. Molecular dynamics simulation was used to study the compatibility of composites. The results show that the acetyl is introduced into the bamboo fiber in FT-IR. The mass ratio of bamboo fiber,acetic anhydride and ice acetic acid set as 1∶ 2. 16∶ 9. 18,the amount of catalyst as 0. 15% of bamboo fiber at 50 ℃ for 2 h,the（ Ac-BF） / PBS composites get the best mechanical properties,crystallization and thermal properties. Molecular simulations results show that strong interaction exists between Ac-BF and PBS matrix. The lower Flory-Huggins interaction parameters（ χ） and mixed energy（ Emix） show a more stable system of Ac-BF/PBS composites. The interface compatibility is effectively improved which verify the performance improvement of the composites.