摘要
目的制备具有抗氧化性的增韧聚乳酸(PLA)基片材。方法采用乙酰柠檬酸三丁酯(ATBC)、聚乳酸与茶多酚(TP)共混制备复合片材,差示扫描量热分析(DSC)探究试样的热力学性能,采用力学性能测试片材的抗拉强度和断裂伸长率,通过傅里叶红外光谱(FTIR)判断材料内部作用,采用水接触角和透湿性测试衡量片材的亲水性和阻湿性,采用DPPH法测试片材抗氧化性。结果断裂伸长率最高提升了108.7%,而试样的抗拉强度无规律变化;通过红外测试得出C=O向低波数移动。ATBC和TP的加入可以有效促进PLA结晶。水接触角测试表明改性前后的PLA表面疏水,而加入了TP后,材料表面显著亲水,且含有TP的试样水蒸气阻隔性变差。抗氧化性测试结果表明,加入质量分数为1%的TP后的片材抗氧化性显著提升,其抗氧化能力相当于质量浓度约为300mg/L的L-抗坏血酸(Vc)。结论ATBC/PLA-TP复合片材性能良好且具备发展潜力。
The work aims to prepare toughened polylactic acid(PLA)-based sheets with oxidation resistance.The composite sheets were prepared with blended acetyl tributyl citrate(ATBC),polylactic acid and tea polyphenols(TP).The thermal properties and mechanical properties of the sheets were investigated by differential scanning calorimetry(DSC),the tensile strength and elongation at break were tested,the chemical interaction within the material was determined by Fourier infrared spectroscopy(FTIR),the hydrophilicity and moisture barrier were tested by water contact angle and moisture permeability,and the resistance to oxidation was tested by DPPH method.The elongation at break increased by 108.7%,while the tensile strength of the specimens changed irregularly.The infrared test showed a shift of C=O to lower wave numbers,and the addition of ATBC and TP effectively promoted PLA crystallization.Water contact angle tests showed that the surface of PLA before and after modification was hydrophobic,while the addition of TP resulted in a significantly more hydrophilic surface and a poorer water vapor barrier for specimens containing TP.The results of the oxidation resistance test showed that the oxidation resistance of the sheets with a mass fraction of 1%of TP was significantly increased,with an oxidation resistance equivalent to L-ascorbic acid(Vc)at a mass concentration of approximately 300 mg/L.Therefore,the ATBC/PLA-TP composite sheet has good properties and potential for development.
作者
任纪州
李亚娜
林勤保
李增辉
REN Ji-zhou;LI Ya-na;LIN Qin-bao;LI Zeng-hui(Wuhan Polytechnic University,Wuhan 430023,China;Packaging Engineering Institute,Jinan University,Zhuhai 519070,China)
出处
《包装工程》
CAS
北大核心
2022年第3期9-15,共7页
Packaging Engineering
关键词
聚乳酸
乙酰柠檬酸三丁酯
茶多酚
物理性能
抗氧化性
polylactic acid
acetyl tributyl citrate
tea polyphenols
physical properties
oxidation resistance
