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首页> 外文期刊>Journal of Applied Polymer Science >Three-layer sheets based on gelatin and poly(lactic acid), part 1: Preparation and properties
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Three-layer sheets based on gelatin and poly(lactic acid), part 1: Preparation and properties

机译：基于明胶和聚乳酸的三层板，第1部分：制备和性能

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摘要

Glycerol-plasticized gelatin (Ge-30Gly) and poly(lactic acid) (PLA) films were prepared by heat-compression, molded, and then piled to produce a biodegradable three-layer sheet with PLA as outer layers and Ge-30Gly as the inner layer. Lamination with PLA increased the moisture resistance and reduced the total soluble matter with respect to a single gelatin layer, while keeping transparency. The tensile strength of the multilayer sheet (36.24±64.27 MPa) increased 16 folds when compared to that of Ge-30Gly. Lamination also exerted beneficial effects on the barrier properties. The WVP of the multilayer sheet (1.2 ± 0.1 10~(-14)kg·m·Pa ~(-1)·s~(-1)·m~(-2)) decreased with reference to that of Ge-30Gly, while oxygen permeability (17.1 ± 2.3 cm~3(O2) · mm · m~(-2)· day~(-1)) was reduced with respect to that of neat PLA, and the value obtained was comparable to that of Ge-30Gly layer. The presence of plasticized gelatin in the multilayer increased the energy at crack initiation (1.4 ± 0.3 J · m~(-1)) with respect to that of PLA. The improvement attained in all these properties was ascribed to the good compatibility and adhesion of the individual layers featured through hydrogen interactions between the carbonyl group from PLA and the hydrogen from the peptide bonds in gelatin. Compatibility was corroborated by scanning electron microscopy observations at PLA/Ge-30Gly interface and by the absence of additional peaks in the tan δ curve of dynamic-mechanical analysis.
机译：通过热压制备甘油增塑的明胶（Ge-30Gly）和聚乳酸（PLA）膜，成型，然后堆放以生产可生物降解的三层薄板，其中PLA为外层，Ge-30Gly为薄膜。内层。与PLA层压可提高相对于单个明胶层的耐湿性并减少总可溶性物质，同时保持透明性。与Ge-30Gly相比，多层片材的拉伸强度（36.24±64.27 MPa）增加了16倍。层压还对阻挡性能产生了有益的影响。相对于Ge-30Gly，多层片材的WVP（1.2±0.1 10〜（-14）kg·m·Pa〜（-1）·s〜（-1）·m〜（-2））降低，相对于纯净的PLA，氧气透过率（17.1±2.3 cm〜3（O2）·mm·m〜（-2）·天〜（-1））降低，其值可与Ge-30Gly层。相对于PLA，多层中增塑明胶的存在增加了裂纹萌生时的能量（1.4±0.3 J·m〜（-1））。所有这些性能的改善归因于各个层的良好相容性和粘合性，这些特性是通过PLA的羰基与明胶中的肽键的氢之间的氢相互作用实现的。通过在PLA / Ge-30Gly界面的扫描电子显微镜观察以及动态力学分析的tanδ曲线中没有其他峰的存在，证实了兼容性。

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