交酯

It was shown that high optical purity lactide and crystallization in polymerization led to higher molecular weight PLA using low-toxic zinc lactate as catalyst.

结果表明，合适的裂解温度有利于合成高光学纯度的丙交酯；在低毒乳酸锌的催化作用下，高光学纯度的单体以及聚合过程中的结晶都有利于制备高分子量聚乳酸。

Nitrogen was used as carrier gas and the area normalization method was applied to calculate the content of the crude lactide.

采用TP-5毛细管柱，以氢火焰离子化检测器检测，N2为载气，以校正面积归一化法计算粗品丙交酯中各组分的含量。

This review focused on the reasearch progress of polylactide synthesised either by direct polycondensation of lactic acid or ring-opening polymerization of lactide at home and aborad in recent years.

综述了近年来国内外聚乳酸直接合成法和丙交酯开环聚合法的研究进展，对聚乳酸改性方法进行了深入的总结和评述，并揭示了聚乳酸材料的研究开发前景。

As compared with the lactide ring-opening polymerization, the direct melting copolymerization of LA and CL is proved more practicable and simpler.

与丙交酯开环聚合二步法相比，LA与CL直接熔融共聚的合成工艺简单易行。

The reason why polylactide is a noncrystalline polymer, and its degradation relocity is big, which fulfils the biomedical requirement as a degradable material.

由于聚D，L丙交酯是非结晶聚合物，其降解速率大，可完全符合生物医学对降解材料的要求。

In this paper, not only the mechanism of thermal degradation of polylactide is introduced, but also the kinds of metal catalysts, their influence on L-lactide formation and racemization through thermal degradation of PLLA are referred.

本文介绍了聚乳酸热降解的反应机理，详细阐述了添加的金属催化剂的种类，及其催化PLLA热降解生成L-丙交酯及发生消旋化作用的机理。

The preparing method includes following steps: adding organic iron to carbon nanotube polylol solution, cooling to room temperature by heating to boiling, the product dispersing in toluol or chloroform via being separated, dried after adding nonpolar solvent, then adding the prepared solution to solution prepared by L-lactide and evocating agent, then separating, drying product.

本发明的制备方法如下：将有机铁加入到碳纳米管多元醇溶液中，加热到沸腾后冷却至室温，加入非极性溶剂后，分离、干燥产物，将所得产物分散在甲苯或三氯甲烷中，然后将所得溶液加入到L-丙交酯与引发剂配成的溶液中，然后分离、干燥产物。

The monomer reactivity ratios of lactides weredetermined with 〓 as catalyst or bimetallic μ-oxo alkoxide as initiator.

在辛酸亚锡和双金属烷氧化合物引发体系中，分别测定了交酯类单体的竞聚率。

The structure and properties of the resulted polymer were analysed by infrared spectroscopy and differential scanning calorimetry, etc.

采用红外IR，DSC等方法表征了聚乙交酯的结构和性质。

Stannous caprylate was selected as the catalyst. Under certain vacuum, we investigate the relation of both the dose of catalyst, the temperature of reaction, the time of reaction and the molecular weight of the PLA.Furthermore we investigate how the purity of lactide and the circumstance of vacuum affect the molecular weight of the PLA.

实验中选用辛酸亚锡Sn(oct_2为催化剂，在一定的真空度下考察了催化剂用量、反应温度、反应时间与聚乳酸分子量的关系；并考察了丙交酯纯度及真空度对聚乳酸分子量的影响。

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。