交酯

The poly grafted starch copolymer was synthesized by the reaction of glycolide and starch in dimethyl sulfoxide with triethylamine as catalyst.

摘要以乙交酯和淀粉为原料，三乙胺为催化剂，在二甲基亚砜介质中合成了聚羟基乙酸接枝淀粉共聚物。

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。

Mechanism of poly(dioxanone- co -glycolide) sutures in vitro degradation was studied by DSC and X-ray diffraction and the surface morphology was studied with photography for the purpose of improving properties of absorbable sutures.

用DSC和X-ray衍射法对聚对二氧环己酮-乙交酯缝合线的初期体外降解过程进行了研究，并使用纤维摄影仪对纤维在降解过程中的表面形态变化进行了观察。

Samples of lactide with melting point 127℃ were conducted a quantitative analysis test by using non aqueous titration with sodium methoxide and Karl Fischer method.

用甲醇钠非水滴定法、卡尔－费休法对熔点为127℃的丙交酯样品进行了定量分析试验，测出残存的乳酸和水的质量分数分别为0.09％和0.07％左右，回收率分别为98.64％～101.2％和98.74％～101.1％。

The D,L-lactide was prepared from D,L-lactic acid with the stannous octoate as the catalyst and the factors affecting the preparation were discussed.

以乳酸为单体，在催化剂存在下乳酸先缩聚后解聚制备了D，L-丙交酯。

The resules show that the optimal reaction conditions are as follows: tin octoate is used as catalyst; w(SnOct2)lw and w(nano-SiO2)/w is 1:400 and 1:20, respectively; the reaction temperature is 140 CC and the reaction time is 72 h. Under this conditions, composite withM of 1.5091×10^5 was obtained.

结果表明，最优的反应条件为：采用辛酸亚锡为催化剂，催化剂用量和二氧化硅用量分别为丙交酯用量的0.25%和5%，在140℃油浴中，氮气保护下反应72h，可得到重均分子量为1.5091×10^5的聚乳酸纳米二氧化硅复合材料。

Polylactide/ nano-silica composites were synthesized with lactide and modified nano-silica by tin octoate catalyst.

以丙交酯和改性后的纳米二氧化硅为原料，在辛酸亚锡催化作用下，制备了聚乳酸纳米二氧化硅复合材料。

PEG-PLA block copolymers were synthesized using polyethylene glycol and lac-tide in the presence of low toxic stannous octoate. The copolymer structure was determined by 13C NMR and the average block leng this were calculated.

本文报道聚乙二醇在辛酸亚锡存在下与丙交酯反应合成PEG-PLA嵌段共聚物，用~(13)C NMR测定了共聚物的结构，估算了平均链段长度。

A series of copolymers with L-lactideand 3-methyl-morpholine-2,5-dioneweresynthesized using stannous octoate as catalyst,and characterized with FT-IR,~1HNMR and viscosity determina-tion.

以辛酸亚锡为催化剂，合成了3-甲基吗啉-2.5-二酮与 L-丙交酯的共聚物，并用 FT-IR、~1HNMR、粘度测定法对共聚物进行了表征。

Due to the increasingly deep concerns about the cytotoxicity of stannous octoate, which is the most widely used catalyst for synthesizing polyesters derived from lactides (L-LA, D, L-LA, GA) via ring opening polymerization, a lot of new metal complexes of relatively low toxicity including Schiff base–Al complexes, Red-Al were developed and used to initiate the living, stereo-specific, and/or stereo-selective ROP of lactides.

由于合成聚乳酸类生物医用降解材料的最常用的催化剂辛酸亚锡 Sn2的细胞毒性问题已在世界范围内引起日益深切的关注，近年来国内外学者已研究开发出许多性能优异的低毒、非锡金属络合物催化剂（如：位阻西佛碱-Al 络合物， Red-Al 等）用于催化交酯类单体的活性、立构专一性及立构选择性聚合反应。

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。