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首页> 外文期刊>Packaging Technology and Science >Synthesis, Characterization and O-2 Permeability of Shape Memory Polyurethane Films for Fresh Produce Packaging
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Synthesis, Characterization and O-2 Permeability of Shape Memory Polyurethane Films for Fresh Produce Packaging

机译：新鲜农产品包装用形状记忆聚氨酯薄膜的合成，表征和O-2渗透性

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The aim of this work was to investigate the effect of film formulations in an effort to obtain a fresh produce packaging film with increased temperature sensitivity for gas permeability. Series of shape-memory polyurethane (SMPU) were synthesized using poly(ethylene glycol) (PEG), 1,6-hexamethylene diisocyanate, 1,4-butanediol and castor oil (CO) and casted into films. The changes in thermal, viscoelastic, shape-memory properties and oxygen permeability of the films were studied. The polyurethane films with 1500gmol(-1) PEG showed a phase transition temperature (switching temperature) between 20 and 27 degrees C. The SMPU consisting of 50/50 CO/PEG had a log E value of 8.32Pa and showed good elasticity as low density polyethylene. SMPU prepared from 1500gmol(-1) PEG with 50/50 CO/PEG and 40/60 butanediol/(PEG+CO) ratios showed excellent shape-memory properties with shape recovery ratio >85% and shape fixity ratio >90%. This film had higher oxygen permeability and showed up to 67% increase in Q(10) value for oxygen permeability compared with commercial packaging films like low density polyethylene. This film can be used to develop smart packaging with increased thermally responsive gas permeability to similar levels observed in respiration rates of fresh produce. Copyright (c) 2016 John Wiley & Sons, Ltd.
机译：这项工作的目的是研究薄膜配方的作用，以期获得对透气性具有更高温度敏感性的新鲜包装薄膜。使用聚乙二醇（PEG），1,6-六亚甲基二异氰酸酯，1,4-丁二醇和蓖麻油（CO）合成了一系列形状记忆聚氨酯（SMPU），并浇铸成膜。研究了薄膜的热，粘弹性，形状记忆性能和透氧性的变化。具有1500gmol（-1）PEG的聚氨酯薄膜的相变温度（转换温度）在20到27摄氏度之间。由50/50 CO / PEG组成的SMPU的log E值为8.32Pa，低时显示出良好的弹性密度聚乙烯。由1500gmol（-1）PEG以50/50的CO / PEG和40/60的丁二醇/（PEG + CO）的比例制备的SMPU表现出优异的形状记忆特性，形状恢复率> 85％，形状固定率> 90％。与低密度聚乙烯等商业包装薄膜相比，该薄膜具有更高的透氧性，并且透氧性的Q（10）值提高了67％。该薄膜可用于开发智能包装，使热响应气体渗透率提高到新鲜农产品呼吸速率中观察到的相似水平。版权所有（c）2016 John Wiley＆Sons，Ltd.

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