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首页> 外文期刊>Polymer: The International Journal for the Science and Technology of Polymers >Cyclic polyesters: Part 8. Preparation and characterization of cyclic oligomers in six aromatic ester and ether-ester systems
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Cyclic polyesters: Part 8. Preparation and characterization of cyclic oligomers in six aromatic ester and ether-ester systems

机译：环状聚酯：第8部分。在六种芳族酯和醚-酯体系中环状低聚物的制备和表征

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Cyclic oligomers of tetraethylene glycol terephthalate (TEGT), tetraethylene glycol isophthalate (TEGI), tetraethylene glycol orthophthalate (TEGO), decamethylene terephthalate (DMT), decamethylene isophthalate (DMI) and decamethylene orthophthalate (DMO) were prepared successfully and cleanly from a ring-chain equilibrium reaction in dilute solution of chlorobenzene. The reactions were monitored by gel permeation chromatography (GPC) and proton nmr and C-13 NMR spectroscopy, and the molar cyclic concentrations [M-x] deduced (x = 1-10). The cyclic oligomers were also analysed by fast atom bombardment mass spectrometry (FAB-MS), matrix assisted laser desorption ionization-time of Right mass spectometry (MALDI-TOF MS) and differential scanning calorimetry (DSC). The existence of the cyclic oligomers was proven by all of the above methods. In addition, it was found that small amounts of linear species were formed, especially in the TEGT system. (C) 1998 Elsevier Science Ltd. All rights reserved. [References: 26]
机译：从环-环上成功地制备了四乙二醇对苯二甲酸酯（TEGT），间苯二甲酸四乙二醇酯（TEGI），邻苯二甲酸四乙二醇酯（TEGO），对苯二甲酸癸二醇酯（DMT），间苯二甲酸癸二醇酯（DMI）和邻苯二甲酸癸二醇酯（DMO）的环状低聚物氯苯稀溶液中的链平衡反应。通过凝胶渗透色谱（GPC），质子核磁共振和C-13 NMR光谱监测反应，并推导摩尔循环浓度[M-x]（x = 1-10）。还通过快速原子轰击质谱法（FAB-MS），右质谱法（MALDI-TOF MS）和差示扫描量热法（DSC）对基质辅助的激光解吸电离时间进行了分析。通过所有上述方法证明了环状低聚物的存在。另外，发现形成少量的线性物质，尤其是在TEGT系统中。 （C）1998 Elsevier ScienceLtd。保留所有权利。 [参考：26]

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