摘要
聚合物的链结构、相态以及与渗透分子的相互作用决定了其阻隔性,故使用不同的改性剂提高聚对苯二甲酸乙二醇酯(PET)的阻隔性以使其能够应用于阻隔性包装瓶。本文制备了尼龙MXD6T-SiO2纳米复合材料(NMXD6T)齐聚物作为提高聚酯瓶用料阻隔性能的改性剂,由己二酸、对苯二甲酸和脂肪族二胺通过原位聚合制备NMXD6T。在相同摩尔二胺的情况下,不同摩尔比例的己二酸和对苯二甲酸使复合材料具有不同的粘度、热性能和阻隔性能,含有NMXD6T改性剂的聚酯其阻隔性能相对于纯聚酯提高了3-10倍。用差热扫描量热分析(DSC)、透射电镜(TEM)和傅立叶红外光谱(FTIR)表征了NMXD6T结构以及与聚酯阻隔性能的关系。DSC曲线表明NMXD6T是完全无定形态,红外光谱证明了纳米复合材料中硅-氧键的存在,透射电镜图片显示二氧化硅颗粒以30nm到100nm大小的尺寸均匀分散在MXD6T基质中并且和聚酯链很好的连接。
The permeability of polymer is determined by its chain configuration, phase morphology and the interaction with the penetrant. Based on these principles, the permeability of the polyester of poly （ethylene terephthalate） is enhanced through different moditiers in order to apply it to barrier packing bottle. In this paper, poly （m - xylylene adipamide - terephthalyl amide） （MXD6） - nanometer silicon dioxide （SiO2） nanocomposite （NMXD6T） oligomer was prepared and used to improve the barrier property of polyester bottle materials. In preparing NMXD6T, silica is insitu polymerized with hexane diacid, terephthalic acid （TPA）, alkyl and aromatic diamine. The different molar ratio of hexane diacid to terephthalic acid with the same molar diamine is designed to give the composites with different viscosity, thermal performance and the barrier properties. The 3 - 10 times of enhanced barrier properties of these polyerster based nanocomposites with this above MXD6T to pure polyester resins are first reported. The NMXD6T＇s configuration and its relationship with the permeability properties of polyester are characterized by techniques of the dynamic scanning calorimeter （DSC）, FT Infrared, and Transmission Electronic Microscopy （TEM）. DSC shows that NMXD6T is totally amorphous. FTIR shows the existence of silicon - oxygen bond formed in the nanocomposite, and TEM indicates an average size from 30nm to 100nm of SiO2 particles being phase separated from MXD6T matrix, while well bonded to the polyester chains.
出处
《惠州学院学报》
2007年第3期9-13,共5页
Journal of Huizhou University
基金
惠州学院博士科研启动项目(C505.0302)
