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 × 10⁻¹⁵ (cm³·cm/cm²·s·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.

中文翻译：

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通过将羟基封端的聚丁二烯与纳米二氧化硅接枝来改善PET复合材料的阻氧性能

通过两步将羟基封端的聚丁二烯（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。傅里叶变换红外光谱（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，并且HTPB的接枝量占总数的11.2％纳米二氧化硅的质量。PET复合材料样品也被单轴拉伸成膜。拉伸结果表明，复合薄膜的拉伸强度通常高于复合片材，特别是PET / SiO ₂的拉伸强度。‐HTPB复合膜达到139.8 MPa。单轴拉伸后，所有薄膜的结晶度均得到明显改善，填料加快了PET的结晶速度，极大地提高了复合材料的结晶度，从而有助于改善复合材料的阻氧性能。添加催化剂后，PET / SiO ₂ -HTPB / Co复合膜的最低透氧系数为1.05×10 ^-15（cm ³ ·cm / cm ²·s·pa），比纯PET片材低87.6％。SEM表明填料与基体之间的相容性得到改善。这项研究表明，HTPB接枝的纳米二氧化硅在提高材料的结晶度和发挥HTPB的活性氧清除方面起着协同作用，单轴拉伸有助于改善复合材料的综合性能。