查询词典 lactide

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。

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。

Specific drug–polymer interactions are engineered by optimizing the lactide to glycolide ratio and including specific polymer end groups.

通过优化丙交酯与乙交酯比例及加入特殊的聚合物末端基来获得特殊的药物-聚合物间相互作用。

Because, until now, we only knew how to make these biodegradable polymers using two monomers (the basic components of polymers), lactide and glycolide. It is rather like making a bead necklace when only green and red beads are aailable.

因为，直到现在，我们只知道如何利用这些生物可降解聚合物使用良种单层膜，脱水乳酸和乙交酯，它就像党只有绿色和红色珍珠时也可以制成项链。

Firstly, D,L-lactide was synthesized from D,L-lactic acid with zinc powder as catalyst,and glycolide from glycolic acid using Sb2O3 as catalyst.

首先以乳酸为原料，锌粉为催化剂合成了丙交酯；以乙醇酸为原料，三氧化二锑为催化剂合成了乙交酯。

The resulted D,L-lactide and glycolide were found to have ring structure by fourier transform infrared spectrometry and proton nuclear magnetic resonance(1H NMR) spectrometry.

通过傅立叶红外光谱和氢核磁谱(1H NMR)测试表明所合成的丙交酯和乙交酯具有环状结构。

Then two star-shaped oligomers with designed molecular weights 5000 g mol-1 and 10000 g mol-1, respectively, were synthesized from D, L-lactide and glycolide as raw materials and pentaerythritol as initiator under catalysis of dibutyltin oxide.

以合成的丙交酯和乙交酯为原料，季戊四醇为引发剂，氧化二丁基锡为催化剂合成出设计分子量为5000和10000两种预聚物。

Methods:(1) Application of poly (lactide-co -glycolide) as a carrier and prepare PLGA-BDNF nanospheres using a double emulsion/solvent evaporation technique.

(1)采用聚为载体材料，采用复乳化溶剂挥发法制备BDNF-PLGA纳米粒。

Part I: Characterization of the stability and biocompatibility of PLGA conduits.1 Artificial nerve conduits were successfully fabricated using two different copolymer ratios of PLGA(85:15 and 50:50)(lactide:glycolide).2 Degradation of PLGA(85:15) and PLGA(50:50) conduits were examined in vitro for 12 weeks in phosphate buffered saline at 37℃, pH 7.4 and in vivo for up to 8 weeks following implantation into the rat dorsal muscle.

结果显示：①体内外降解条件下，PLGA(50：50)管吸水率、失重率及生物降解率显著高于PLGA(85：15)管；②两种材料样品体内生物降解率显著高于体外降解率；③扫描电镜观察显示，随降解时间延长，材料样品表现为特征性的虫蚀样破坏并进行性加重，以PLGA（50：50）管尤为明显。

This one mode pays close attention to network credence foundation of the businessman very much.

这一模式非常关注商人的网络信用基础。

Cell morphology of bacterial ghost of Pasteurella multocida was observed by scanning electron microscopy and inactivation ratio was estimated by CFU analysi.

扫描电镜观察多杀性巴氏杆菌细菌幽灵和菌落形成单位评价遗传灭活率。