摘要
目的以安全无毒的方式提高聚乙烯醇薄膜的耐水性,用海洋植物来源的κ-卡拉胶材料与聚乙烯醇共混,以部分取代石油基材料成为新的包装材料。方法以聚乙烯醇为基材,通过共混占聚乙烯醇不同质量分数(2.5%、5%、7.5%、10%、12.5%)的κ-卡拉胶,以确定力学性能最优的共混膜配方。再以最佳共混配方为基础,添加占聚乙烯醇不同质量分数的(12.5%、25%、37.5%)香草醛为交联剂,在pH=2的酸性条件下制备香草醛/聚乙烯醇/κ-卡拉胶交联薄膜。通过傅里叶红外变换光谱、X射线衍射研究薄膜的化学结构,扫描电镜表征薄膜的微观形貌,拉伸强度和断裂伸长率评估薄膜的力学性能,吸湿性测试、水蒸气透过系数以及水接触角表征薄膜的耐水性能、琼脂盘扩散试验表征薄膜的抗菌性能。结果傅里叶变换红外光谱表明,香草醛的醛基与聚乙烯醇和κ-卡拉胶的醇羟基之间存在羟醛缩合反应,证明发生了交联反应。当聚乙烯醇质量分数为4%、κ-卡拉胶、香草醛分别为的聚乙烯醇质量的7.5%、25%时,共混薄膜的拉伸拉强度达到44.02 MPa;吸湿率(相对湿度为100%)、水蒸气透过系数比纯聚乙烯醇薄膜的分别提升了17.91%、15.18%。抗菌圈实验表明添加香草醛提高了共混薄膜的抗菌性。结论香草醛的加入改善了聚乙烯醇/κ-卡拉胶共混薄膜的耐水性能、力学性能和抗菌性能,克服了聚乙烯醇薄膜耐水性差的缺点,拓展了其应用范围。
The work aims to improve the water resistance of polyvinyl alcohol films in a safe and non-toxic manner and blend theκ-carrageenan materials from marine plant with polyvinyl alcohol to partially replace petroleum-based materials as a new packaging material.Firstly,poly(vinyl alcohol)was used as the base material to determine the blended film formulation with optimal mechanical properties by blendingκ-carrageenan with different mass fractions of poly(vinyl alcohol)(2.5%,5%,7.5%,10%,and 12.5%).Then,the vanillin/polyvinyl alcohol/κ-carrageenan films were prepared based on the optimal blending formulation after added with different mass fractions of(12.5%,25%,and 37.5%)vanillin as a cross-linking agent under acidic conditions at pH=2.The chemical structures of the films were investigated by Fourier Transform Infrared Spectroscopy(FTIR)and X-ray Diffraction(XRD),the microscopic morphologies of the films were characterized by Scanning Electron Microscopy(SEM),the mechanical properties of the films were eva luated based on Tensile Strength(TS)and Elongation at Break(EB),the water resistance of the films was characterized by the hygroscopicity test,Water Vapor Permeation Coefficient(WVP),and Water Contact Angle,and the antimicrobial properties of the films were characterized by the agar disc diffusion test.FTIR spectroscopy showed hydroxyaldol condensation among the aldehyde group of vanillin and the alcohol hydroxyl group of polyvinyl alcohol andκ-carrageenan,proving that cross-linking reaction occurred.When the mass fraction of polyvinyl alcohol was 4%,κ-carrageenan and vanillin were 7.5%and 25%of the mass of polyvinyl alcohol,respectively,the tensile strength of the blended film reached 44.02 MPa.Compared with the pure poly(vinyl alcohol)film,the moisture adsorption(100%RH)and water vapor transmission coefficient were improved by 17.91%and 15.18%,respectively.Antimicrobial circle experiments showed that the addition of vanillin improved the antimicrobial properties of the blended films.In summary,the addition of
作者
王秀超
刘保栋
张帅
郭传燕
郭红革
WANG Xiu-chao;LIU Bao-dong;ZHANG Shuai;GUO Chuan-yan;GUO Hong-ge(Faculty of Light Industry,Qilu University of Technology,Jinan 250353,China)
出处
《包装工程》
CAS
北大核心
2023年第23期36-43,共8页
Packaging Engineering
基金
齐鲁工业大学(山东省科学院)国际合作研究专项基金(QLUTGJHZ2018028)。
关键词
聚乙烯醇
Κ-卡拉胶
香草醛
交联
耐水性
polyvinyl alcohol
κ-carrageenan
vanillin
cross-linking
water resistance
