查询词典 lactide

The cost of lactide is one of the most important factors that hamper the PLA from widely use for a long time. In this paper a series of apparatus which can boost the product ratio to the utmost was focused on. Meanwhile the factors affecting the molecular weight of PLA in the polymerization were also discussed.

长期以来丙交酯的成本一直是制约聚乳酸推广应用的最重要的因素之一，本文致力于设计出一套能最大限度降低丙交酯成本的工艺过程，并对丙交酯聚合过程中影响聚乳酸分子量的因素进行了初步探讨。

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。

Second, the commonly used ring-opening polymerization between glycerol and lactide for the preparation of degradable polyurethane network was replaced with the more simple and economic method, which is polycondensation between lactic acid and glycerol.

其次，我们用乳酸和丙三醇的直接缩聚代替常用的较为复杂的丙交酯和丙三醇的开环聚合法用于可降解聚氨酯交联网络的制备。

The orthogonal design method is adopted, by changing catalyst category, catalyst quantity, reaction time, reaction temperature, to select the optimum conditions for lactide synthesis.

实验采用正交设计方法，通过改变催化剂种类、催化剂用量、脱水时间、环化时间四个主要影响因素进行实验，根据实验结果选择最好的丙交酯制备的实验方案。

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。

The lactide was characterized by IR, 1H-NMR, MS, elemental analysis and Ultraviolet spectrophotometry.

考察了蒸馏工艺、催化剂种类对乳酸脱水效率的影响；用IR、1HNMR、MS、元素分析、紫外光谱分析对丙交酯进行了表征；并考察了丙交酯在不同溶剂中的溶解性。

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。

In order to increase the strength and load capability of poly L-lactide for fracture innerfixation,the composite materials of PLLA and β- calcium metaphosphate whisker with the aspect ratio of 30～50 prepared by crystallizing in the glass were obtained.

为了提高骨折内固定材料聚乳酸的力学强度及承载能力，通过玻璃结晶化方法制备得到长径比为30~50的偏磷酸钙晶须，将CMPw与左旋聚乳酸复合，制得抗压强度为80MPa，抗弯强度为40MPa，断裂强度达到170MPa的复合材料。

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 quality of both red and white wine depends very much on the wine maker talent and on the quality of the grapes.

他的红酒和白酒的品质，根据酿造者的能力和葡萄的质量，各有差异。

No, I don't want to get drunk before my next match.

" "不，我不想让我的下一场比赛前喝醉了。