A set of 12 first-in-class, biobased pyrazine-containing polyesters was synthesized based on dimethylpyrazine dipropionic acid. These new diacid monomers were obtained from underutilized nitrogen-rich biomass. The polyester materials were synthesized via a two-step melt transesterification–polycondensation procedure with molecular weights between 12 300 and 47 500 g/mol and dispersities between 1.9 and 2.3. Six of the obtained polymers were amorphous and six were semi-crystalline. The thermal properties of the materials were studied; thermal degradation was found to take place at the monomer degradation temperature. The effect of methyl groups on the glass transition temperature was investigated, and the materials were found to behave mostly as aliphatic polyesters in this regard. The melting points of the methyl-substituted polyesters were found to be high and within the range of those of current high-performance polyesters. These materials are thus a welcome addition to current biobased polyesters.

中文翻译：

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生物基含吡嗪聚酯

基于二甲基吡嗪二丙酸合成了一组12种一流的生物基含吡嗪聚酯。这些新的二酸单体是从利用不足的富氮生物质中获得的。聚酯材料是通过两步熔融酯交换-缩聚过程合成的，分子量介于12 300和47 500 g / mol之间，分散度介于1.9和2.3之间。得到的聚合物中有六种是无定形的，六种是半结晶的。研究了材料的热性能；发现在单体降解温度下发生热降解。研究了甲基对玻璃化转变温度的影响，发现该材料在这方面主要表现为脂肪族聚酯。发现甲基取代的聚酯的熔点高并且在当前的高性能聚酯的熔点范围内。因此，这些材料是当前生物基聚酯的受欢迎的添加。