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首页> 外文期刊>RSC Advances >Synthesis and characterization of poly(ethylene terephthalate-co-1,4-cyclohexanedimethylene terephtlatate)-block-poly(tetramethylene oxide) copolymers
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Synthesis and characterization of poly(ethylene terephthalate-co-1,4-cyclohexanedimethylene terephtlatate)-block-poly(tetramethylene oxide) copolymers

机译：聚对苯二甲酸乙二醇酯- co <​​/ em> -1,4-环己烷二亚甲基对苯二甲酸酯-嵌段-聚四氢呋喃共聚物的合成与表征

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A series of poly(ethylene terephthalate-co-1,4-cyclohexanedimethanol terephthalate)-block-poly(tetramethylene oxide) (PETG-block-PTMO) copolymers were synthesized by means of a polycondensation process and characterized using 1H nuclear magnetic resonance (H NMR) and Fourier transform infrared spectroscopy (FTIR), that confirm the successful synthesis of the material. Differential scanning calorimetry (DSC), small – and wide-angle X-ray diffraction (SAXS and WAXS), and thermogravimetric analysis (TGA) were used in order to evaluate the influence of the block copolymers' composition and microstructure on the phase transition temperatures, thermal properties, as well as the thermooxidative and thermal stability of the PETG-block-PTMO copolymers, respectively. The mechanical properties were investigated by tensile testing and dynamic mechanical measurements (DMTA). We found that along with an increase in PTMO weight fraction, both number-average molecular weights and intrinsic visocisities increase. Moreover, an increase in the flexible segments content in PETG-block-PTMO resulted in shifting the values of glass transition temperatures toward lower ones, which was confirmed by DSC and DMTA analyses, thus affirming the miscibility of both phases. At the same time, along with an increase of PTMO flexible segments amount in the PETG-block-PTMO copolymers, the values of Young's modulus, tensile strength at yield and weight losses in lower temperatures range, i.e. 280–390 °C, decrease.
机译：合成了一系列的聚对苯二甲酸乙二醇酯-co-1,4-环己烷二甲醇对苯二甲酸酯-嵌段-聚四亚甲基氧化物（PETG- 嵌段 -PTMO）共聚物。缩聚反应的方法，并使用 1 H核磁共振（H NMR）和傅里叶变换红外光谱（FTIR）进行表征，证实了该材料的成功合成。为了评估嵌段共聚物的组成和微观结构对相变温度的影响，使用了差示扫描量热法（DSC），小角度和广角X射线衍射（SAXS和WAXS）以及热重分析（TGA）。 ，PETG- 嵌段 -PTMO共聚物的热性能以及热氧化和热稳定性。通过拉伸测试和动态力学测量（DMTA）研究了力学性能。我们发现，随着PTMO重量分数的增加，数均分子量和固有粘度均增加。此外，PETG- 嵌段 -PTMO中柔性链段含量的增加导致玻璃化转变温度的值向更低的方向偏移，这通过DSC和DMTA分析得到了证实，从而确认了两者的互溶性。阶段。同时，随着PETG- 嵌段 -PTMO共聚物中PTMO柔性链段数量的增加，在较低温度范围内的杨氏模量，屈服拉伸强度和重量损失值 ie 280–390°C，降低。

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