纳米CaCO3原位改性对壳聚糖复合涂膜性能的影响.pdf

现代食品科技 Modern Food Science and Technology 2015, Vol.31, No.1 纳米 CaCO3 原位改性对壳聚糖复合涂膜性能的影响 郝文婷，郝晗，孙彤，吴朝凌，励建荣 （渤海大学化学化工与食品安全学院，辽宁锦州 121013） 摘要：以硬脂酸钠为原位改性剂，采用流延法制备了原位改性纳米 CaCO3/壳聚糖复合涂膜。以机械强度(Ts、EB)、水蒸气透过 率(WVP)、氧气透过率(OP)、二氧化碳透过率(CDP)、水溶性、吸水率、抑菌性为检测指标，研究了原位改性工艺条件对纳米 CaCO3/ 壳聚糖复合涂膜性能的影响。研究结果表明，当改性温度为 80 ℃，改性时间为 40 min 时，纳米复合涂膜的拉伸强度显著提高，其对 氧气、水蒸气的阻隔能力提高，对二氧化碳阻隔能力下降，涂膜透光性提高，表明壳聚糖与 CaCO3 的相容性增强，工艺条件对复合 涂膜性能影响显著。此外，改性温度对铜绿假单胞菌和粘质沙雷氏菌的抑菌效果影响显著，但改性时间基本不影响涂膜对铜绿假单胞 菌的抑菌效果，这可能与纳米复合涂膜聚合物分子对两种菌的作用方式或菌内酶作用有关。 关键词：原位改性；纳米 CaCO3；壳聚糖；涂膜 文章篇号：1673-9078(2015)1-71-76 DOI: 10.13982/j.mfst.1673-9078.2015.1.014 Influence of the in-situ Modification of Nano-CaCO3 on the Properties of Composite Chitosan Coatings HAO Wen-ting, HAO Han, SUN Tong, WU Chao-ling, LI Jian-rong (College of Chemistry, Chemical Engineering and Food Safety, Bohai University, Bozhou 121013, China) Abstract: Nano-CaCO3-chitosan composite coatings were prepared by the tape-casting process with sodium stearate as an in-situ modifier. The influence of the conditions during in-situ modification on the properties of the composite coatings was studied in terms of mechanical properties (Ts and EB), water vapor permission (WVP), O2 permeability (OP), CO2 permeability (CDP), water solubility, water absorption, and antibacterial activity. The results showed that when the conditions for nanocomposite coating in situ was changed to 80 ℃ for 40 min, the tensile strength of the composite