查询词典 stannous

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。

A series of copolymers of ε-caprolactone with 3-methyl-morpholine-2,5-dione are synthesized by using stannous octoate as catalyst.

以辛酸亚锡为催化剂，合成了3-甲基吗啉-2，5-二酮与ε-己内酯的共聚物，并用 FT-IR、~1HNMR、DSC、粘度测定等分析方法对共聚物进行了表征。

When catalyst (sherwood oile was used to dissolve stannous octoate and get liquor which concentration was 0.00001 mol/ml) was 1ml, temperature was 165℃, time was 5h, the percentage yield of PGLA was 79.5%.

合成共聚物采用的催化剂为用石油醚溶解的浓度为0.00001mol/ml的辛酸亚锡溶液，当催化剂用量为1ml，温度为165℃，时间为5h时，产率达到最大值，为79.5

The key factors affecting the polymer intrinsic viscosity were found to be monomer recrystallization times,stannous octoate concentration and polymerization time.

单体重结晶次数、辛酸亚锡浓度、聚合时间等条件均是影响聚合物特性粘数的重要因素。

The product synthesized under the optimum conditions as follows had final acid value of 0.494 mgKOH/g,and conversion of reatants up to 99.59%,molar ratio of isooctanol to phthalic anhydride 3∶1,the dosage of both aluminium oxide and stannous octoate as catalyst 0.2%(based on the total mass of reactants),reaction time 2.5 hours.

考察了工艺条件对合成DOP的影响，结果表明，在异辛醇与苯酐摩尔比3∶1，氧化铝/辛酸亚锡复配催化剂用量分别占反应物总量的0.2%，反应温度230℃，反应时间2.5h的最佳工艺条件下，产品终点酸值0.494mgKOH/g，反应物转化率达99.59%。

A novel biodegradable copolymer of poly and poly (γ-benzyl-L-glutamate) was successfully synthesized. Under appropriate conditions, the PBLG initiates the ring-opening polymerization of L-lactide to produce block copolymer, by using low toxicity stannous octoate as catalyst. The optimal reaction conditions were determined as follows; the catalytic agent: PBLG=1:1, the temperature is 120℃, the reaction time is 6h.

以L-丙交酯为原料，在催化剂辛酸锡酯Sn2的作用下，利用聚的活性端氨基引发LLA进行开环聚合，合成了聚L-丙交酯与聚的共聚物，对反应条件的各项因素进行了讨论，确定了最佳反应条件是：m：m=1：1；反应温度120℃；反应时间6h。

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。

The PDLLA with a viscosity average molecular weight beyond 20×10~4 was obtained under the optimum synthesis conditions of the lactide after being recrystallized 4 times as the monomer,the vacuum level of 0.098 MPa,reaction temperature of 150-160 ℃,reaction time of 6-8 h,and using 0.1%-0.18% stannous octoate as catalyst.

实验结果表明，重结晶4次后的丙交酯作为单体，在辛酸亚锡摩尔分数为0.1%—0.18%，真空度0.098 MPa，聚合温度150—160℃下聚合6—8 h可获得粘均相对分子质量Mη大于20×104的聚D，L-丙交酯。

In 2000, Nishida et al synthesized the PPDO whose molecular weight could reach 142,000 but the monomer conversion could only reach 79.4% by using stannous octoate as catalyst with co-initiator under conditions that T = 100oC, M/I = 4900, t = 20 h, in 2000, the enzymatic polymerization of PDO was carried out at 100oC for 15 hours using 5wt% immobilized lipase CA by Nishida et al.

这主要是因为PDO的结构相对稳定，开环聚合要比GA、LA、CL困难一些，而且用于PDO开环聚合的催化剂体系单一，主要集中在Ti， Zr， Sn， Ld， La， Yb， Hg等重金属，然而这些重金属作为副产物，不容易从PPDO中分离出来，阻碍了PPDO作为医用材料的应用，这也造成了PPDO的成本昂贵。

Plunder melds and run with this jewel!

掠夺melds和运行与此宝石！

My dream is to be a crazy growing tree and extend at the edge between the city and the forest.

此刻，也许正是在通往天国的路上，我体验着这白色的晕旋。