Abstract To improve the glass transition temperature (Tg) and heat resistance of polyethylene terephthalate (PET) bottle, poly (ethylene glycol 1,4-cyclohexane dimethylene isosorbide terephthalate) (PEICT) with a unique cyclic structure was introduced into PET. The miscibility of the PET/PEICT blends and their feasibility as a heat resistant bottle were investigated. The introduction of PEICT into PET increases the Tg and the PET/PEICT blends exhibit a single Tg, indicating good miscibility between PEICT and PET. Furthermore, the Tg and crystallinity of the PET/PEICT blends can be adjusted by controlling the amount of PEICT added. The PET/PEICT blends were transparent in the visible light range (no significant change in transparency) because the blends were truly miscible as confirmed by Fox equation. As expected, the introduction of PEICT into PET bottle allows for improved heat resistance and shape stability due to the rigid molecular structure and chirality of the two tetrahydrofuran rings in the isosorbide group of PEICT. Based on our results, the as-prepared PET/PEICT blends with controllable high heat resistance can be used as a cost-effective alternative material for various hot-filling conditions in the beverage industry by adjusting the optimal ratio of PEICT to PET for each product (e.g. fruit juice, tea).

中文翻译：

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用于热灌装瓶的耐热 PET/生物基聚酯共混物的制备和表征

摘要 为了提高聚对苯二甲酸乙二醇酯（PET）瓶的玻璃化转变温度（Tg）和耐热性，将具有独特环状结构的聚（乙二醇1,4-环己烷二亚甲基异山梨醇对苯二甲酸酯）（PEICT）引入到PET中。研究了 PET/PEICT 混合物的混溶性及其作为耐热瓶的可行性。将 PEICT 引入 PET 会增加 Tg，而 PET/PEICT 混合物表现出单一的 Tg，表明 PEICT 和 PET 之间具有良好的混溶性。此外，PET/PEICT 共混物的 Tg 和结晶度可以通过控制 PEICT 的添加量来调节。PET/PEICT 共混物在可见光范围内是透明的（透明度没有显着变化），因为如 Fox 方程所证实的那样，共混物确实是可混溶的。正如预期的那样，由于 PEICT 异山梨醇基团中两个四氢呋喃环的刚性分子结构和手性，将 PEICT 引入 PET 瓶可提高耐热性和形状稳定性。根据我们的研究结果，通过调整每种产品的 PEICT 与 PET 的最佳比例，制备的具有可控高耐热性的 PET/PEICT 混合物可用作饮料行业各种热灌装条件的经济高效的替代材料（例如果汁、茶）。