采用溶剂共混-流延成膜法制备了一种基于聚乳酸(PLA)/聚己内酯(PCL)/十四烷(TD)的柔性相变蓄冷薄膜。研究表明:PLA/PCL复合基底可有效封装TD分子,当支撑基底PLA/PCL与TD质量比为1∶0.8时,PLA/PCL/TD柔性相变蓄冷薄膜表现出最佳的热稳定性和最高的相对焓效率(63.0%),经过10次冷热循环后其熔融潜热和凝固潜热分别保持在108.5J/g和107.5J/g,相变温度为4.31℃,杨氏模量为230.8MPa,较纯PLA-PCL薄膜降低74.5%,柔韧性得到显著提升。将最佳配比条件下制备的相变蓄冷薄膜与脱脂棉复合制成蓄冷袋,考察了蓄冷袋对油桃果实的温升抑制效果。结果表明,PLA/PCL/TD柔性相变蓄冷薄膜可使冷藏油桃温升延迟12min,该薄膜在食品冷链运输中具有广阔的应用前景。
A flexible phase-change cold-storage film based on polylactic acid (PLA)/polycaprolactone (PCL)/tetradecane (TD) was fabricated using a solvent blending-casting method.The results demonstrated that the PLA/PCL composite matrix effectively encapsulated TD molecules.The film with a PLA/PCL-to-TD mass ratio of 1∶0.8 exhibited optimal thermal stability and the highest relative enthalpy efficiency (63.0%).After 10 thermal cycles,its latent heats of melting and solidification remained at 108.5J/g and 107.5J/g,respectively,with a phase-change temperature of 4.31℃.The Young's modulus was 230.8MPa,representing a 74.5% reduction compared to the pure PLA-PCL film,indicating significantly enhanced flexibility.Furthermore,a cold-storage bag was developed by integrating the optimized film with absorbent cotton,and its efficacy in suppressing temperature rise in nectarine fruits was evaluated.The results revealed that the PLA/PCL/TD phase-change film prolonged the temperature rise by 12 minutes,underscoring its significant potential for application in cold chain logistics of food products.
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