壬酸增塑改性明胶膜的制备及性能研究

Preparation and Performance of Nonanoic Acid Plasticized Gelatin Films

可生物降解塑料的研发对于实现“双碳”目标具有重要的意义和价值。以明胶为原材料,通过壬酸增塑、双醛淀粉交联和热压处理相结合的方法制得明胶膜,探究壬酸增塑和热压处理对双醛淀粉交联的明胶膜结构和性能的影响。结果表明,当壬酸添加比例为20%时,改性的明胶膜表面光滑、结构致密,具有最高的抗张强度和较低的断裂伸长率、水蒸气透过率和溶胀性能。经过11 min的热压处理后,明胶膜表现出良好的耐水性和力学性能,且在土壤中被降解22 d后仍然能够维持较完整的薄膜形貌,降解34 d后其质量损失超80%。基于壬酸增塑、双醛淀粉交联和热压处理制备的明胶膜机械强度高、耐水性好且可生物降解,其为环境友好蛋白塑料的研发提供了有益策略。

The development of biodegradable plastics holds significant importance and value in achieving carbon peaking and carbon neutrality goals.Utilizing gelatin as the raw material,gelatin films were produced through a combination method involving plasticizing with nonanoic acid,crosslinking with dialdehyde starch,and hot pressing.Investigation was conducted to explore the effects of nonanoic acid plasticizing and hot pressing on the structure and performance of dialdehyde starch-crosslinked gelatin films.Results indicate that,when a 20%addition of nonanoic acid was made,the modified gelatin films exhibited a smooth surface,dense structure,the highest tensile strength,and lower rates of elongation at break,water vapor permeability and swelling properties.After 11 minutes of hot pressing,the gelatin film demonstrated improved water resistance and mechanical properties.It maintained a relatively intact film morphology after 22 days of degradation in soil,and over 80%mass loss after 34 days.The gelatin films prepared through nonanoic acid plasticizing,dialdehyde starch crosslinking,and hot pressing,with high mechanical strength,water resistance and environmental degradability,are offered beneficial strategies for the development of environment-friendly protein plastics.