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6sbiam至尊木蟲 (著名寫手)
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[求助]
請(qǐng)問這個(gè)東西的分子量大小
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| 一雙端環(huán)氧低聚物產(chǎn)品介紹中說functional group equivalent weight (g/mol)為490,那么它的分子量到底是多少?490?245?980?我越弄越糊涂了。請(qǐng)指教!謝謝! |
至尊木蟲 (著名寫手)
木蟲 (著名寫手)

鐵桿木蟲 (正式寫手)
豆豆
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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] 如果是雙端環(huán)氧低聚物,說明每個(gè)高分子齊聚物中有兩個(gè)當(dāng)量的環(huán)氧。你的是functional group equivalent weight (g/mol)為490也可以表示為(g/eq)490及其分子量為490*2=980 |

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