查询词典 lactide

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。

When lactide was purified byethyl acetate for 4 times, it was pure enough to polymerize to be PLA.

以乙酸乙酯作为重结晶溶剂，当重结晶次数达到四次后，其纯度已达到丙交酯聚合的基本要求。

This apparatus was designed based on summarizing the most synthetic processes of lactide presently.

本文在总结了目前众多聚乳酸单体——丙交酯的合成技术的基础上，选用减压蒸馏工艺并加以改进，设计出最佳的实验装置，使丙交酯的产率从30％提高到45％，并对重结晶后的母液进行有效的回收，回收率也能达到40％，对回收后的丙交酯进行了测试分析，证明了回收过程的可行性。

PURAC offers the lactide monomers as polymerization feedstock and in cooperation with Sulzer the polymerization technology to make PLA.

普拉克提供的原料和聚合与苏尔寿技术合作的乳酸聚合单体，使人民解放军。

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。

Firstly, through analysis for the synthetic mechanism of lactide and according to improve the condition of synthetic process the factors related were studied in detail.

首先，从改善合成丙交酯反应的条件入手，通过对丙交酯合成反应的机理分析，对反应过程中催化剂用量、种类、脱水温度、时间、压力、解聚温度、时间、压力等做了详细的研究，得出最佳的合成条件和工艺过程。

Two main synthesis methods of PLA, condensation polymerization of lactic acid and ring-opening polymerization of lactide in recent years are described in details, and the situation of production is analyzed as well.

最后，对聚乳酸的合成及应用前景进行了展望，并指出可生物降解材料聚乳酸一旦工业化，它在医用及降解塑料方面将会有难以估量的应用前景

Hydroxyapatite/poly lactide biomaterial has become one of the most important and potential bone graft substitutes because of its favorable biocompatibility and bioactivity.

羟基磷灰石/聚乳酸复合材料以其良好的生物相容性和生物活性成为骨替代材料中较重要、较有潜力的一部分。

An indirect spectrophotometric method was used to determine the content of lactide. The factors on the determination, such as the type of solvent, acid and alkali dosage, the time of aminolysis reaction and so on, were discussed.

采用间接光度法测定粗丙交酯中丙交酯的含量，讨论了溶剂类型、胺解反应时间、酸碱用量等因素对测定结果的影响。

In this new architectural plan the Garden of Golgotha came to be at the centre of the new city.

Aelia 是高举他自己，并在此城内朝拜罗马诸神。

The continuous nature of peat accumulation means that terrestrial coaly rocks may provide a higher resolution and more complete record of base-level change than the time-equivalent shallow-marine strata, thus enabling the identification of highfrequency cycles that are not recorded in themarine strata.

泥炭积累的持续性质的手段，陆地coaly岩石可提供较高的分辨率和更完整的记录基准面变化的影响时，相当于浅海阶层，从而使确定的高频周期，不记录在themarine 阶层。