Abstract

Bioblend films composed of polyvinyl alcohol/carboxymethyl cellulose/citric acid/glycerol PVA/CMC/CA/Glyc were prepared by the casting method. The effect of different contents of citric acid and glycerol as cross-linker and plasticizer, respectively, on the properties was evaluated. The properties of the bioblend films were determined using FTIR spectroscopy, mechanical tests, TGA and XRD. The best properties were observed in PVA/CMC/CA/Glyc bioblend film with composition (1:1:1/30 vol %), which was characterized by lower swelling behavior, higher tensile properties and good thermal stability. The use of citric acid (CA) as an inexpensive natural cross-linker enhanced the water resistance of the prepared bioblend film at composition of (1:1:1/30 vol %). The increase of citric content more than 1% ratio leads to the formation of bioblend with a higher mobility of chains, which resulted in a higher swelling behavior that is not recommended in some applications such as packaging materials. Glycerol (Glyc) is found to be a good plasticizer that improved mechanical, thermal and water resistance properties via the formation of hydrogen bonding within the bioblend matrix. Further modifications of the prepared bioblend film were obtained by irradiation with gamma rays at different doses. It is found that at irradiation dose of 10 kGy, the thermal and mechanical properties improved and water resistance increased. The improved mechanical and thermal properties of the selected PVA/CMC/CA/Glyc bioblend film with composition (1:1:1/30 vol %) were compared with LDPE and PP commercial packaging films, and they were found to be competitive to these films.

Graphic abstract

中文翻译：

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γ辐射对新型聚乙烯醇/羧甲基纤维素/柠檬酸/甘油生物共混膜性能的影响

摘要

通过浇铸法制备了由聚乙烯醇/羧甲基纤维素/柠檬酸/甘油PVA/CMC/CA/Glyc组成的生物共混膜。评估了不同含量的柠檬酸和甘油分别作为交联剂和增塑剂对性能的影响。使用 FTIR 光谱、机械测试、TGA 和 XRD 确定了生物共混膜的性能。在 PVA/CMC/CA/Glyc 生物共混薄膜中观察到最佳性能（1:1:1/30 vol%），其特点是溶胀行为更低、拉伸性能更高、热稳定性好。使用柠檬酸 (CA) 作为廉价的天然交联剂提高了所制备的生物共混膜的耐水性，其组成为 (1:1:1/30 vol%)。柠檬酸含量增加超过 1% 的比例会导致形成具有更高链流动性的生物混合物，从而导致更高的溶胀行为，这在某些应用（例如包装材料）中是不推荐的。发现甘油 (Glyc) 是一种良好的增塑剂，可通过在生物混合物基质内形成氢键来改善机械、耐热和防水性能。通过用不同剂量的伽马射线照射，获得了对制备的生物混合物薄膜的进一步改进。发现在10 kGy的辐照剂量下，热性能和机械性能得到改善，耐水性提高。将所选的 PVA/CMC/CA/Glyc 生物共混薄膜与 LDPE 和 PP 商业包装薄膜的组成（1:1:1/30 vol%）进行了比较，改进了机械和热性能

图形摘要