| 摘要: |
| 目的 以魔芋葡甘聚糖(KGM)为原料，制备新型的可生物降解的缓冲包装材料并研究其性能。方法 采用冷冻干燥法制备缓冲包装材料，利用扫描电镜和静态压缩实验来分析 KGM 质量分数、冷冻温度、冷冻时间对缓冲包装材料泡孔结构及力学性能的影响。 结果 随着 KGM 质量分数的增加，缓冲包装材料的孔隙率降低，但孔径、弹性模量和屈服强度增大，材料的密实化阶段也有所提前；随着冷冻温度的降低，缓冲包装材料的孔隙率、孔径均降低，但弹性模量和屈服强度增大，同时材料的密实化阶段有所提前；随着冷冻时间的延长，缓冲包装材料孔隙率几乎没有变化，孔径略有增大，材料的力学性能变化不明显，弹性模量和屈服强度略有降低，材料的密实化阶段有所推迟。结论 KGM 质量分数为 3%，冷冻温度为-20 ℃，冷冻时间为 12 h 时， KGM 缓冲包装材料的最小缓冲系数为 2.79，最大静应力为 0.156 MPa，其最小缓冲系数及其对应的最大静应力与低密度发泡聚苯乙烯相近，具有实际应用的潜力。 |
| 关键词: 魔芋葡甘聚糖 冷冻干燥法 缓冲包装材料 |
| DOI： |
| 分类号:TB484.6 |
| 基金项目: |
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| Preparation and Properties of Konjac Glucomannan Cushioning Package Material |
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ZHOU Ling-qing, WANG Jia-jun, YU Li-ping, ZHANG Yan-ping
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Zhejiang Sci-Tech University, Hangzhou 310018, China
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| Abstract: |
| The preparation technique of a novel biodegradable cushioning package material that took the Konjac glucomannan(KGM) as the raw material was developed and its properties were investigated. The freeze-drying method was used to prepare the cushioning package material. And the variations of KGM concentration, freezing temperature and freezing time influencing the cell structure and mechanical property were analyzed by scanning electron microscope and compression test. With the increase of the KGM concentration, the porosity of cushioning package material decreased, whereas the aperture, elasticity modulus and yield strength of cushioning package material increased. The densification stage of the material was also brought forward. With the fall of freezing temperature, both the aperture and porosity of cushioning package material decreased, but the elasticity modulus and yield strength increased. The densification stage of the material was also brought forward. Prolonging the freezing time had little effect on the porosity of cushioning package material, and the aperture slightly increased. The mechanical property showed no obvious change, the elasticity modulus and yield strength decreased slightly, and the stage of densification was slightly delayed. When the KGM concentration was 3%, the freezing temperature was -20 °C and the freezing time was 12 h, the minimum cushioning coefficient of about 2.79 and the maximum static stress of 0.156 MPa were obtained. The property of KGM cushioning package material at the concentration of 3% was similar to that of the low density expandable polystyrene, which has the practical application potential. |
| Key words: Konjac glucomannan freeze-drying method cushioning packaging material |
