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jilifu007木虫 (小有名气)
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| 为了研究不同反应配比对聚合物性质的影响,分别在6个不同的水与KH-560的摩尔比m下进行水解(m分别为1.1～1.6)。由于水是二官能度单体,因此m大于1时就会形成支化结构。图4为聚合物的粘度随m变化的规律曲线，从图中可以看出，随着水用量的增加,所得聚合物的分子量和粘度呈增大的趋势。m 从1.3增加到1.5时,分子量和绝对粘度随m的增大急剧增大。这是由于水用量较大时,聚合物已经呈现较高支化度的结构,少量水的加入就可以使这些支化的聚合物分子相互缩聚形成更大、支化度更高的大分子,直到生成网状结构时就形成凝胶。实验所涉及合成的HBPSi均为有一定粘度液体,这些聚合物在四氢呋喃、乙醚、氯仿中易溶,但放置一段时间，粘度会逐渐变大，最终变成凝胶。这是由于HBPSi中含有的未反应Si—OH基团进一步缩合所导致的。以上红外光谱、1H NMR 谱和绝对粘度测试表明,通过KH-560的受控水解,可以实现甲氧基向硅氧基的转变,进而生成可溶性的超支化聚硅氧烷。 |
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wangyonghong
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| In order to study the different nature of the response ratio of the polymer, in 6 different water KH-560 and the ratio m under the hydrolysis (m were 1.1 to 1.6). As the water is the second single functionality, so m will be greater than 1:00 to form branched structures. Figure 4 for the viscosity of the polymer m with the changes in the law of the curve, can be seen from the chart, with the increase in the amount of water, from molecular weight and viscosity of the polymer was increased. m from 1.3 to 1.5, the absolute molecular weight and viscosity increased dramatically with the increase of m. This is due to the large amount of water, the polymer has a high degree of branching structure, adding a small amount of water so that they can support each other elements of the polymer condensation to form larger, supporting a higher degree of macromolecules, Generate up to form a mesh structure on the gel. Laboratory HBPSi are involved in the synthesis of a certain viscosity of the liquid, the polymer in tetrahydrofuran, ether, soluble in chloroform, but the place for a period of time, the viscosity will gradually become larger and eventually into a gel. This is due to HBPSi response did not contain the Si-OH group to further the cause of the condensation. More than IR, 1H NMR spectrum and absolute viscosity test showed that the KH-560 through the controlled hydrolysis can be achieved methoxy-to-silicon changes in the overruns in turn generate soluble of polysiloxane. |
2楼2008-12-19 09:40:29
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3楼2009-11-22 16:00:18
