Koster S, Duursma MC, Boon JJ, Nielen MW, Heeren RM
Unit for Macromolecular Mass Spectrometry, FOM-Institute for Atomic and Molecular Physics, Kruislaan 407, 1098 SJ Amsterdam, The Netherlands.
J Mass Spectrom. 2000 Jun;35(6):739-48. doi: 10.1002/1096-9888(200006)35:6<739::AID-JMS3>3.0.CO;2-#.
The molecular structure of a series of homo- and copolyesters was studied using sustained off-resonance irradiation collisionally activation dissociation on a Fourier transform ion cyclotron resonance mass spectrometer. Electrospray ionization was used as an ionization technique. The most important fragmentation pathways of the homopolyesters poly(dipropoxylated bisphenol-A/adipic acid) and poly(dipropoxylated bisphenol-A/isophthalic acid) were studied. Six different dissociation mechanisms were observed which are very similar to the mechanisms found to occur during pyrolysis of these compounds. Four of these mechanisms are a result of cleavages of the ester bond and the others are due to cleavages of the ether bond or bisphenol-A unit. Some of the fragments expected are not present in the spectrum, indicating that each fragment has a specific sodium affinity. Sequence-specific fragments of two of the three copolyester sequences that theoretically can exist were experimentally observed. Fragments that originate from the third sequence are not unique and can also be formed from other sequences. Therefore, it was not possible to determine the presence of the third sequence. Copyright 2000 John Wiley & Sons, Ltd.
利用傅里叶变换离子回旋共振质谱仪上的持续非共振辐照碰撞激活解离技术，研究了一系列均聚酯和共聚酯的分子结构。采用电喷雾电离作为电离技术。研究了均聚酯聚（二丙氧基化双酚A/己二酸）和聚（二丙氧基化双酚A/间苯二甲酸）最重要的裂解途径。观察到六种不同的解离机制，这些机制与这些化合物热解过程中发现的机制非常相似。其中四种机制是酯键断裂的结果，其他机制是由于醚键或双酚A单元的断裂。预期的一些碎片在光谱中不存在，这表明每个碎片都有特定的钠亲和力。实验观察到理论上可以存在的三个共聚酯序列中的两个序列特异性碎片。源自第三个序列的碎片不具有独特性，也可以由其他序列形成。因此，无法确定第三个序列的存在。版权所有2000约翰威立父子有限公司。
