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6sbiam

至尊木虫 (著名写手)

[求助] 请问这个东西的分子量大小

一双端环氧低聚物产品介绍中说functional  group equivalent weight (g/mol)为490,那么它的分子量到底是多少?490?245?980?我越弄越糊涂了。请指教!谢谢!
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czx2910863

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【答案】应助回帖

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感谢参与,应助指数 +1
wgs8136(金币+3): 感谢应助,欢迎常来高分子版! 2012-02-09 08:49:57
wgs8136: 回帖置顶 2012-02-09 08:49:58
6sbiam(金币+3): 有帮助 谢谢! 2012-02-09 18:02:41
http://en.wikipedia.org/wiki/Equivalent_weight
In polymer chemistry, the equivalent weight of a reactive polymer is the mass of polymer which has one equivalent of reactivity (often, the mass of polymer which corresponds to one mole of reactive side-chain groups). It is widely used to indicate the reactivity of polyol, isocyanate, or epoxy thermoset resins which would undergo crosslinking reactions through those functional groups.

It is particularly important for ion-exchange polymers (also called ion-exchange resins): one equivalent of an ion-exchange polymer will exchange one mole of singly charged ions, but only half a mole of doubly charged ions.[6]
Nevertheless, given the decline in use of the term "equivalent weight" in the rest of chemistry, it has become more usual to express the reactivity of a polymer as the inverse of the equivalent weight, that is in units of mmol/g or meq/g.[7]
如果是双端环氧低聚物,说明每个高分子齐聚物中有两个当量的环氧。你的是functional  group equivalent weight  (g/mol)为490也可以表示为(g/eq)490及其分子量为490*2=980
西藏,新疆。。。中国永远的痛
6楼2012-02-09 08:33:26
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