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首页> 外文期刊>RSC Advances >Silicon-containing poly(esters) with halogenated bulky side groups. Synthesis, characterization and thermal studies
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Silicon-containing poly(esters) with halogenated bulky side groups. Synthesis, characterization and thermal studies

机译：具有卤代大体积侧基的含硅聚酯（酯）。合成，表征和热学

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摘要

Poly(esters) (PEs) derived from diacids containing bulky side groups, which have an halogenated (Cl, Br) imide ring, an aminoacidic residue (glycine, L-alanine, L-valine) and an amide group were obtained with a silicon-containing diphenol. Also PEs without the aminoacidic residue were obtained. PEs were characterized by IR and NMR spectroscopy, and the results were in agreement with the proposed structures. PEs were obtained with good yields and moderate or high eta(inh) values. PEs were soluble in aprotic polar solvents and were swollen in other solvents like m-cresol and THF. The T-g values were determined and it was possible to see a tendency in the sense that when the size of the atom (Cl, Br) bonded to the imidic ring is increased, the T-g values decreased, also for those PEs obtained without the aminoacidic residue. The thermal decomposition temperatures showed that only two PEs can be considered as thermostable, considering TDT values above 400 degrees C at 10% of weight lost. The other PEs showed good thermal stability, showing in general a decrease of the TDT values when the volume of the side group, is increased. PEs showed UV-vis transparency at 400 nm lower than 20%, but between 500 and 600 nm, showed 80% transparency. PEs containing halogen atoms showed flame retardancy in a simple essay, with respect to PEs without halogen atoms in which the combustion was complete.
机译：用硅获得了由具有庞大侧基的二酸衍生的聚酯（PEs），该二酸具有卤化的（Cl，Br）酰亚胺环，氨基酸残基（甘氨酸，L-丙氨酸，L-缬氨酸）和酰胺基。含二酚。还获得了没有氨基酸残基的PE。用红外光谱和核磁共振光谱对聚乙烯进行了表征，结果与所提出的结构相符。 PE的收率高，η（inh）值适中或较高。 PE可溶于非质子极性溶剂中，并在其他溶剂（如间甲酚和THF）中溶胀。确定了Tg值，并且在这样的意义上可以看到一种趋势，即当键合到酰亚胺环上的原子（Cl，Br）的尺寸增加时，对于没有氨基酸残基的那些PEs，Tg值也降低了。 。热分解温度表明，考虑到TDT值在失重10％时高于400摄氏度，则只有两个PE可以被认为是热稳定的。其他PE显示出良好的热稳定性，当侧基的体积增加时，总体上显示TDT值降低。 PE在400 nm处显示的UV-vis透明度低于20％，但在500至600 nm之间显示80％的透明度。相对于不含卤素原子且燃烧已完全完成的PE，含卤素原子的PE在简单的文章中显示出阻燃性。

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