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首页> 外文期刊>Green chemistry >Carbohydrate-based PBT copolyesters from a cyclic diol derived from naturally occurring tartaric acid: a comparative study regarding melt polycondensation and solid-state modification
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Carbohydrate-based PBT copolyesters from a cyclic diol derived from naturally occurring tartaric acid: a comparative study regarding melt polycondensation and solid-state modification

机译：天然酒石酸衍生的环状二醇中的基于碳水化合物的PBT共聚酯：关于熔融缩聚和固态改性的比较研究

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摘要

2,3-O-Methylene-L-threitol (Thx) is a cyclic carbohydrate-based diol prepared by acetalization and subsequent reduction of the naturally occurring tartaric acid. The structure of Thx consists of a 1,3-dioxolane ring with two attached primary hydroxyl groups. Two series of partially bio-based poly(butylene tere-phthalate) (PBT) copolyesters were prepared using Thx as a comonomer by melt polycondensation (MP) and solid-state modification (SSM). Fully random copolyesters were obtained after MP using mixtures of Thx and 1,4-butanediol in combination with dimethyl terephthalate. Copolyesters with a unique blocklike chemical microstructure were prepared by the incorporation of Thx into the amorphous phase of PBT by SSM. The partial replacement of the 1,4-butanediol units by Thx resulted in satisfactory thermal stabilities and gave rise to an increase of the T_g values, this effect was comparable for copolyesters prepared by MP and SSM. The partially bio-based materials prepared by SSM displayed higher melting points and easier crystallization from the melt, due to the presence of long PBT sequences in the backbone of the copolyester. The incorporation of Thx in the copolyester backbone enhanced the hydrolytic degradation of the materials with respect to the degradation of pure PBT.
机译：2,3-O-亚甲基-L-苏糖醇（Thx）是通过缩醛化并随后还原天然酒石酸制备的环状碳水化合物基二醇。 Thx的结构由带有两个连接的伯羟基的1,3-二氧戊环环组成。使用Thx作为共聚单体，通过熔融缩聚（MP）和固态改性（SSM），制备了两个系列的部分生物基聚对苯二甲酸丁二醇酯（PBT）共聚酯。 MP后，使用Thx和1,4-丁二醇与对苯二甲酸二甲酯的混合物，可得到完全无规的共聚酯。通过SSM将Thx掺入PBT的非晶相中，可以制备具有独特的块状化学微观结构的共聚酯。 Thx部分取代1,4-丁二醇单元产生令人满意的热稳定性，并提高了T_g值，这种效果与MP和SSM制备的共聚酯相当。由于共聚酯主链中存在长的PBT序列，由SSM制备的部分基于生物的材料显示出较高的熔点，更易于从熔体中结晶。相对于纯PBT的降解，在共聚酯主链中掺入Thx增强了材料的水解降解。

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