交酯

We use the method of decomposing PLA to synthesize lactide by means of orthodoxical experiment method.

本文主要进行了丙交酯的合成工艺研究及聚乳酸的开环聚合工艺研究。

We investigate how the type of lactide affacts the molecular weight of PLA at the same time.

并考察了丙交酯类型及纯度对聚乳酸分子量的影响。

This technology can not only reduce the cost of producing lactide, but also solve the pollution problems from kitchen garbage.

本工艺不但可降低丙交酯的生產成本，而且解决了厨房垃圾的环境污染问题。

PLA has been produced by ring-opening polymerization of lactide or direct polycondensation of lactic acid.

制备聚乳酸常通过乳酸的直接聚合或丙交酯的开环聚合两种方法。

It included the synthesis of lactide, the purification of lactide, the polymerization of lactide and the compositess analysis and so on.

包括丙交酯的制备、提纯、聚合及复合材料性能的表征一系列研究工作。

It included the synthesis of lactide, the purification of lactide, the polymerisation of lactide and the polymers analysis and so on.

包括丙交酯的制备、提纯、聚合及聚合物的性能表征—系列研究工作。

The effects of splitting temperature on optical purity of lactide were discussed.

以金属锌作催化剂制备丙交酯，研究了不同裂解温度对产物光学纯度的影响。

Theoretical studies on synthetic process of lactide were carried out with density functional theory and the geometries of compounds maybe to appear in reactive system were optimized.

采用密度泛函方法研究了丙交酯的合成过程，优化了合成过程中可能出现的化合物的几何构型，分析了各化合物的振动频率和偶极矩。

The key of indirect method is the preparation of intermediate lactide.

间接法合成PDLLA的关键在于中间体D，L-丙交酯的制备。

The results showed that, melting point of high yield lactide made in the lab reached 127℃ after three times of recrystallization, and the yield of lactide reached 57.2%.

结果表明：自制高收率丙交酯经过3次重结晶后，熔点可达到127℃，熔程在1℃以内，总产率为57.2%。

But we don't care about Battlegrounds.

但我们并不在乎沙场中的显露。

Ah! don't mention it, the butcher's shop is a horror.

啊！不用提了。提到肉，真是糟透了。