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首页> 外文期刊>Polymers for advanced technologies >Improving oxygen barrier properties ofPETcomposites via grafting hydroxy-terminated polybutadiene with nanosilica
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Improving oxygen barrier properties ofPETcomposites via grafting hydroxy-terminated polybutadiene with nanosilica

机译：通过用纳米硅接枝羟基封端的聚丁二烯改善氧气阻隔性能的氧屏障性质

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Hydroxy-terminated polybutadiene (HTPB) was grafted onto nanosilica via two steps, and then melt extruded with PET and transition metal catalyst. Fourier transform infrared spectroscopy (FTIR) and thermogravimetric analysis (TGA) results showed that HTPB successfully bridged to the surface of nanosilica through toluene-2,4-diisocyanate (TDI), and the grafting amount of HTPB accounted for about 11.2% of the total mass of nanosilica. The PET composite samples were also uniaxially stretched into films. Tensile results showed that the tensile strength of composite films was generally higher than that of composite sheets, especially the tensile strength of PET/SiO2-HTPB composite film reached 139.8 MPa. After uniaxial stretching, the crystallinity of all films were significantly improved, and fillers accelerated the crystallization rate of PET, which greatly improved the crystallinity of composite materials, thereby contributing to the improvement of the oxygen barrier performance of composite materials. After adding the catalyst, the PET/SiO2-HTPB/Co composite film has the lowest oxygen permeability coefficient of 1.05 x 10(-15)(cm(3)center dot cm/cm(2)center dot s center dot pa), which was 87.6% lower than that of pure PET sheet. SEM showed that the compatibility between filler and matrix was improved. This study demonstrated that nanosilica grafted with HTPB played a synergistic role in improving the crystallinity of materials and exerting the active oxygen scavenging of HTPB, and uniaxial stretching was helpful for improving the comprehensive properties of composites.
机译：通过两步将端羟基聚丁二烯（HTPB）接枝到纳米二氧化硅上，然后用PET和过渡金属催化剂熔融挤出。傅立叶变换红外光谱（FTIR）和热重分析（TGA）结果表明，HTPB通过甲苯-2,4-二异氰酸酯（TDI）成功地桥接到纳米二氧化硅表面，HTPB的接枝量约占纳米二氧化硅总质量的11.2%。PET复合材料样品也被单轴拉伸成薄膜。拉伸结果表明，复合膜的拉伸强度普遍高于复合板，尤其是PET/SiO2-HTPB复合膜的拉伸强度达到139.8MPa。单轴拉伸后，所有薄膜的结晶度都显著提高，填料加速了PET的结晶速率，从而大大提高了复合材料的结晶度，从而有助于提高复合材料的阻氧性能。添加催化剂后，PET/SiO2-HTPB/Co复合膜的最低透氧系数为1.05x10（-15）（cm（3）中心点cm/cm（2）中心点s中心点pa），比纯PET膜低87.6%。SEM显示填料与基体的相容性得到改善。本研究表明，纳米二氧化硅接枝丁羟对提高材料的结晶度和发挥丁羟的活性氧清除作用具有协同作用，单轴拉伸有助于提高复合材料的综合性能。

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