棕榈酸壳聚(寡)糖酯/纤维素复合膜的制备及性能研究

Research on Palmitic Acid Chitosan(Oligochitose) Ester/Cellulose Composite Membrane Preparation and Properties

对壳聚(寡)糖化学改性合成不同取代度长链的棕榈酸壳聚(寡)糖酯,于8%氢氧化钠、6.5%硫脲、8%尿素溶剂中制备出棕榈酸壳聚(寡)糖酯/复合膜并研究其性能。FT-IR结果表明,棕榈酸壳聚(寡)糖酯与纤维素能形成氢键,具有一定的相容性;XRD谱图表明,棕榈酸壳聚糖酯的加入会稍微降低复合膜的结晶度,而棕榈酸壳寡糖加入会使复合膜的结晶度增加15.8%;复合膜的接触角随棕榈酸壳聚(寡)糖酯含量的增加分别由19.9%增加到39.0%和39.6%,疏水性能增加。最大拉伸应力在棕榈酸壳聚(寡)糖酯含量6%时达到最大,分别为23.6MPa和33.1MPa,比纯纤维素膜提高了0.56倍和1.80倍。抗菌性能测试显示,复合膜对大肠杆菌的抗菌性大于纤维素膜,且随棕榈酸壳寡糖酯含量的增加先增强再减弱,在6%时达到最大的2.39cm抑菌圈直径,比未改性壳寡糖纤维素膜抑菌圈直径增大14.9%。

Palmitate chitosan （oligochitose）/cellulose composite membranes were prepared in 8% sodium hydroxide, 6.5% thiourea and 8% urea mixed solvents. FT-IR indicated that palmitate chitosan（oligochitose） have certain compatibility with cellulose and can form hydrogen bonds. XRD showed that the addition of palmitate chitosan will slightly reduces the crystallinity of the compound membrane while palmitate oligochitose increased 15. 8%. The contact angle of compound membrane changed from 19.9% to 39.0% and 39.6% respectively, which meant hydrophobic performance was increased. The maximum tensile stress, 23.6 MPa and 33.1 MPa were respectively obtained with the content of 6% palmitate chitosan （oligochitose）, which were 0.56 times and 1.80 that of times higher than that of the pure cellulose membrane. The antibacterial performance test showed that the antimicrobial properties of compound membrane were better than that of pure cellulose membrane. The intensity of the anti- bacterial incresaed firstly and then decreased and reached the maximum bacteriostatic circle diameter （2.39 cm）. Compared with unmodified oligosaccharides/cellulose membrane, it was increased 14.9%.