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The Changes of Transesterification Level in PET/PEN Blends with the Addition of PET–PEN Copolymer

机译:添加PET-PEN共聚物后PET / PEN共混物中酯交换水平的变化

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The extent of transesterification in poly(ethylene terephthalate) (PET)/poly(ethylene-2,6-naphthalate) (PEN) blends with the addition of PET–PEN copolymers was examined by DSC and ~1H-NMR measurements to evaluate the factor affecting the reaction level at a given temperature and time. Both block (P(ET-block-EN)) and random (P(ET-ran-EN)) copolymers were used as the copolymers. At a given treatment temperature and time, the level was increased by the addition of P(ET-block-EN) into PET/PEN blends. On the other hand, a reverse change was observed when P(ET-ran-EN) was mixed with PET/PEN blends. During the treatment, an inhomogeneous phase of the blends changed into the homogeneous one; however, the change showed little effect on the reaction level. The effects of molecular weight on the reaction level were also examined.
机译:通过DSC和〜1H-NMR测量来检查聚对苯二甲酸乙二酯(PET)/聚2,6-萘二甲酸乙二酯(PEN)共混物中加入PET-PEN共聚物的酯交换程度。在给定的温度和时间影响反应水平。嵌段(P(ET-嵌段-EN))和无规(P(ET-ran-EN))共聚物均用作共聚物。在给定的处理温度和时间下,通过将P(ET-block-EN)添加到PET / PEN共混物中来提高含量。另一方面,当P(ET-ran-EN)与PET / PEN混合物混合时,观察到相反的变化。在处理过程中,共混物的不均匀相变为均匀相。然而,该变化对反应水平几乎没有影响。还检查了分子量对反应水平的影响。

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