Preparation and properties of modified basic magnesium hypochlorite/ polyvinyl alcohol antibacterial composite film
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摘要: 为解决食品、药品等易被细菌污染及其包装造成环境污染问题,通过γ-氨丙基三乙氧基硅烷(KH-550)表面改性碱式次氯酸镁(BMH),并将其与聚乙烯醇(PVA)进行复合,制备改性碱式次氯酸镁/聚乙烯醇抗菌复合膜(改性BMH/PVA抗菌复合膜)。通过SEM、接触角分析、抑菌圈实验和FTIR,证明了BMH的有机改性的有效性。通过调节pH值能够保持改性BMH在PVA中的抗菌性能(抗菌率接近100%)。有机改性BMH含量为3wt%时,改性BMH/PVA抗菌复合膜的断裂伸长率提高了25%,不仅使PVA膜具有抗菌性能,还提高了其韧性。结果表明改性BMH/PVA抗菌复合膜是一种有应用前景的抗菌、可降解材料。Abstract: To solve the problem of food and medicine being easily contaminated by bacteria and its packaging causes environmental pollution problems, γ-aminopropyltriethoxysilane (KH-550) was used to modify the basic magnesium hypochlorite (BMH), and was compounded with polyvinyl alcohol (PVA) to obtain modified basic magnesium hypochlorite/polyvinyl alcohol composite membrane (modified BMH/PVA composite membrane). SEM, contact angle analysis, bacteriostatic zone experiment and FTIR have proved the effectiveness of organic modification of BMH. The antibacterial performance of modified BMH in PVA can be maintained by adjusting the pH value (The antibacterial rate is close to 100%). And when the content of organically modified BMH is 3wt%, the elongation at break of the modified BMH/PVA antibacterial composite film is increased by 25%, which not only makes the PVA film have antibacterial properties, but also improves its toughness. The conclusions indicate that the modified BMH/PVA antibacterial composite film is a promising antibacterial film material.
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表 1 不同质量分数的改性碱式次氯酸镁/聚乙烯醇(BMH/PVA)抗菌复合膜
Table 1. Modified basic magnesium hypochlorite/polyvinyl alcohol composite membrane (BMH/PVA) antibacterial composite films with different mass fractions
Sample Mass fraction/wt% PVA BMH 0wt%BMH/PVA 100.0 0 1.5wt%BMH/PVA 98.5 1.5 3wt%BMH/PVA 97.0 3.0 4.5wt%BMH/PVA 95.5 4.5 6wt%BMH/PVA 94.0 6.0 -
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