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Types of Step-Growth Polymers: Polyesters

Types of Step-Growth Polymers: Polyesters

The introduction of polyesters has brought major development to the textile industry. The wrinkle-free behavior of polyester blends has eliminated the need for starching and ironing clothes.
Polyesters are commonly prepared from terephthalic acid and ethylene glycol; the crude product is known as poly(ethylene terephthalate) or PET. However, polyesters are synthesized industrially by transesterification of dimethyl terephthalate with ethylene glycol at 150 °C. The two reactants and the...

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Updated: May 8, 2025

Film Extrusion of Crambe abyssinica/Wheat Gluten Blends

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Published on: January 17, 2017

用于面包包装的蜜蜂-聚乙醇复合薄膜.

Anca Peter¹, Lucica Pop¹, Leonard Mihaly Cozmuta¹

¹Technical University of Cluj Napoca, Faculty of Sciences, Victoriei 76, 430072 Baia Mare, Romania.

Food chemistry: X

|December 24, 2024

概括

用蜜蜂增强的聚乙醇 (PVA) 薄膜显示了面包包装的改善屏障特性. 与纯PVA相比,这些修改过的薄膜提供了更好的热稳定性和降低了水蒸气透性.

关键词:

这是蜜蜂.生物降解性生物降解性标志性描述标志性描述食品包装食品的包装在PVA中使用PVA.热处理是一种热处理.

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Last Updated: May 8, 2025

Film Extrusion of Crambe abyssinica/Wheat Gluten Blends

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Published on: January 17, 2017

Inkjet-printed Polyvinyl Alcohol Multilayers

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科学领域:

材料科学材料科学材料科学
聚合物科学聚合物科学
食品包装技术食品包装技术

背景情况:

聚乙醇 (PVA) 是一种多功能聚合物,具有食品包装的潜力.
提高PVA薄膜的屏障性能对于面包包装等应用至关重要.
像聚乙烯 (PE) 这样的传统包装材料在生物降解性方面存在局限性.

研究的目的:

为了增强聚乙烯醇 (PVA) 薄膜的屏障特性.
评估改性PVA薄膜对于面包包装的适用性.
研究蜜蜂 (BW) 和糖对PVA薄膜特性的影响.

主要方法:

使用PVA,蜜蜂和糖制备复合薄膜.
复合膜的热处理. 复合膜的热处理.
使用X射线衍射 (XRD),富里埃变换红外光谱 (FTIR),X射线光电子光谱 (XPS) 和热重力测量分析 (TGA-DTA) 的表征.
评估水蒸气透性 (WVP),溶解性,膨胀能力和生物降解性.
统计建模包括多重线性回归 (MLR),逐步回归 (SR) 和主要组件分析 (PCA).

主要成果:

在PVA和蜜蜂之间形成了新的交叉链接,证实了复合结构.
糖减少了脱水,而蜂增强了热稳定性.
最佳的PVA-蜂膜的WVP是PE的7.5倍,明显低于纯PVA (29倍).
在WVP,溶性,胀和生物降解性之间发现了直接的相关性.
PCA表明了不同的薄膜行为,PVA含有2g蜜蜂,没有甘油,与PE最相似.

结论:

蜜蜂和甘油有效地提高了PVA薄膜的屏障和热性能.
优化的PVA-蜂膜显示出作为可持续面包包装材料的巨大潜力.
经过修改的PVA薄膜为传统塑料包装提供了有希望的替代品,性能和生物降解性得到改善.